TM 11-5805-298-15_Ringing_Generator_TA-248_1965

*TM 11-5805-298-15

DEPARTMENT OF THE ARMY TECHNICAL MANUAL

ORGANIZATIONAL, DS, GS, AND DEPOT MAINTENANCE

MANUAL STATIC RINGING GENERATORS TA-248/TT

AND TA-248A/TT (INCLUDING REPAIR PARTS AND

SPECIAL TOOL LISTS)

Headquarters, Department of the Army, Washington, D. C. 20315

10 September 1965

WARNING

Be careful when working on the 115-volt acline connections. Serious injury or death may

result from contact with these terminals.

DONT TAKE CHANCES!

This copy is a reprint which includes currentpages from Changes in force C 2 and C 3

This manual supersedes TB SIG 203, 10 October 1953; TM 11-5805-298-12P, 5 July 1961; and TM 11-5805-298-35P, 5 July 1961, including Cl, 9 November 1962.

1

Changes in force: C2 and C3

Change

No. 3

TM 11-5805-298-15*C-3

HEADQUARTERSDEPARTMENT OF THE ARMYWASHINGTON, DC 10 August 1983

OPERATORS, ORGANIZATIONAL, DIRECTSUPPORT, GENERAL SUPPORT, AND DEPOT

MAINTENANCE MANUALGENERATORS, RINGING STATIC TA-248/TT

AND TA-248A/TT (NSN 5805-00-503-1482)TM 11-5805-298-15 is changed as follows:

NOTE

The parenthetical reference to previous changes(para 1-1 of C 1) indicates that pertinent materielwas published in that change.

Page .5. Paragraph 1-1 (page 1 of C 1 ). Delete the lastsentence and substitute:A maintenance allocation chart is provided in appendix III,and repair parts and special tool lists are provided in ap-pendix IV.

Page 5. Paragraph 1-2 (page 1 of C 1 ) is superseded asfollows:1-2. Consolidated Index of Army Publications

and Blank FormsRefer to the latest issue 01 DA Pam 310-1 to determinewhether there are new editions, changes, or additionalpublications pertaining to the equipment.Page 5. Paragraph 1-3 (page 1 of C2) is superseded asfollows:

1-3. Maintenance Forms, Records, and Reportsa. Reports of Maintenance and Unsatisfactory Equip-

ment. Department of the Army forms and procedures usedfor equipment maintenance will be those prescribed by TM38-750, The Army Maintenance Management System(Army).

b. Report of Packaging and Handling Deficiencies. Fillout and forward SF 364 (Report of Discrepancy (ROD))as prescribed in AR 735-1 1-2/DLAR 4140.55/NAVMAT-INST 4355.73/AFR 400.54/MCO 4430.3E.

c. Discrepancy in Shipment Report (DISREP) (SF 361).Fill out and forward Discrepancy in Shipment Report(DISREP) (SF 361) as prescribed in AR 55-38 NAVSUP-INST 4610.33B/AFR 75-18/MCO P4610.19C/DLAR4500.15.

Page 5. Paragraph 1-3.1 (page 1 of C1). Delete andsubstitute

*This change supersedes C 1, 19 Dec 73.

1-3.1 Reporting Errors and RecommendingImprovement

You can help improve this manual. If you find an mis-takes or if you know of a way to improve the procedures,please let us know. Mail your letter or DA Form 2028(Recommended Changes to Publications and Blank Forms)direct to: Commander, US Army Communications-Elec-tronics Command and Fort Monmouth, ATTN: DRSEL-ME-MP, Fort Monmouth, New Jersey 07703. In eithercase, a reply will be furnished direct to you.Page 5. Paragraph 1-3.2 is added after paragraph 1-3.1

1-3.2 Reporting Equipment ImprovementRecommendations (EIR)

If your equipment needs improvement, let us know. Sendus an EIR. You, the user, are the only one who can tell uswhat you dont like about your equipment. Let us knowwhy you dont like the design. Put it on an SF 368 (QualityDeficiency Report). Mail it to Commander, US ArmyCommunications-Electronics Command and Fort Mon-mouth, ATTN: DRSEL-ME-MP, Fort Monmouth, NewJersey 07703. Well send you a reply.

Page 5. Paragraph 1-3.3 is added after paragraph 1-3.2

1-3.3 Administrative StorageAdministrative Storage of equipment issued to and used byArmy activities will have preventive maintenance performedin accordance with the PMCS charts before storing. Whenremoving the equipment from administrative storage thePMCS should be performed to assure operational readiness.Disassembly and repacking of equipment for shipment orlimited storage are covered in TM 740-90-1.Page 5. Paragraph 1-3.4 is added after paragraph 1-3.3

1-3.4 Destruction of Army Electronics MaterielDestruction of Army electronics materiel to prevent enemyuse shall be in accordance with TM 750-244-2.

Page 10. Chapter 3, Section 1 (page 1, para 3-1, 3-2,3-3 and 3-5 of C2) is delered and substituted as follows:

1

C3, TM 11-5805-298-15

3-1. GeneralNOTE

Refer to TM 750-244-2 for proper proceduresfor destruction of this equipment to preventenemy use.

a. Operator/crew preventive maintenance is the syste-matic care, servicing and inspection of equipment to pre-vent the occurrence of trouble, to reduce downtime, andto maintain equipment in serviceable condition. To besure that your Static Generator is always ready for yourmission, you must do scheduled preventive maintenancechecks and services (PMCS).

(1) BEFORE OPERATION, perform your B PMCSto be sure that your equipment is ready to go.

(2) When an item of equipment is reinstalled after

removal, for any reason, perform the necessary B PMCSto be sure the item meets the readiness reporting criteria.

(3) Use the ITEM NO. column in the PMCS table toget the number to be used in the TM ITEM NO. columnon DA Form 2404 (Equipment Inspection and MaintenanceWorksheet) when you fill out the form.

b. Routine checks like CLEANING, LUBRICATION,DUSTING, WASHING, CHECKING FOR FRAYEDCABLES, STOWING ITEMS NOT IN USE, COVERINGUNUSED RECEPTACLES, CHECKING FOR LOOSENUTS AND BOLTS AND CHECKING FOR COMPLETE-NESS are not listed as PMCS checks. They are thingsthat you should do any time you see they must be done.If you find a routine check like one of those listed in yourPMCS, it is because other operators reported problems withthis item.

3-2. Operator/Crew Preventive Maintenance Checks and Services

B Before

IntervalItem Procedures Check for and have Equipment is NotNo. B Item to be Inspected repaired or adjusted as necessary Ready/Available If:

1 Completeness Check for completeness and satis- Major operational componentfactory condition of the equipment. is missing.Report missing items.

2 Generator Perform an equipment operation Equipment fails toRinging Static check. operate properly

Using the telephone centraloffice equipment listen forthe 20 cps output. It shouldbe clear and uninterrupted.

*Do this check before each deployment to a mission location. This will permit any existing problems to be corrected before themission starts. the check does not need to be done again until redeployment.

Page 11. Paragraph 3-5 (page 2 of C2) is deleted.Paragraph 3-8 (page 2 of C2) is superseded as follows:

3-8. Scope of Organizational MaintenanceThe maintenance duties assigned to the organizationalrepair technician are listed below, together with a referenceto the paragraphs covering the specific maintenance func-tions. The required materials are listed in paragraph 3-9.

a. Paragraph 3-8a. deleted.

b. Touchup painting (para 3-13).

c. Replacement of fuses (para 3-14).

2

Page 12. Paragraph 3-10 (page 2 of C2) is superseded asfollows:

3-10. Organizational Preventive MaintenanceChecks and Services.

There are no organizational preventive maintenance checksand service on this equipment. The operator will performgeneral maintenance and scheduled PMCS.

Page 12. Paragraph 3-11 and 3-12 (page 3 of C2). Deleted.Page 19. Appendix 1 REFERENCES. Add the following:TM-740-90-1 Administrative Storage of Equipment

By Order of the Secretary of the Army:

Official:

JOHN A. WICKHAM, JR.General, United States Army

Chief of Staff

ROBERT M. JOYCEMajor General, United States Army

The Adjutant General

DISTRIBUTION:

To be distributed in accordance with DA Form 12-36, Organ iza t i ona lMaintenance requirements for AN/TSQ-70.

TM 11-5805-298-15C2

CHANGE

No. 2

HEADQUARTERS,DEPARTMENT OF THE ARMY

WASHINGTON, DC 5 November 1979

Operators, Organizational, Direct Support,General Support, and Depot Maintenance Manual

GENERATORS, RINGING STATIC TA-248/TTAND TA-248A/TT (NSN 5805-00-503-1482)

TM 11-5805-298-15, 10 September 1965, is changed as follows:The title of the manual is changed as shown above.

Page 5. Paragraph 1-1, line 7. Delete ; andrepair parts and special tool lists are provided inappendix IV.

Paragraph 1-3 is superseded as follows:

1-3. Forms and Recordsa. Reports of Maintenance and Uusatisfactory

Equipment. Maintenance forms, records, andreports which are to be used by maintenancepersonnel at all maintenance levels are listed inand prescribed by TM 38-750.

b. Reports of Packaging and Handling De-ficiencies. Fill out and forward DD Form 6(Packaging Improvement Report) as prescribedin AR 700-58/NAVSUPINST 4030.29/AFR 71-13/MCO P4030.29A, and DLAR 4145.8.

c. Discrepancy in Shipment Report (DISREP)(SF 361). Fill out and forward Discrepancy inShipment Report (DISREP) (SF 361) as pre-scribed in AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO P4610.19C and DLAR 4500.15.

Paragraph 1-3.1, line 6. US Army Elec-tronics Command, ATTN: AMSEL-MA-C, ischanged to read US Army Communicationsand Electronics Materiel Readiness Command,ATTN: DRSEL-ME-MQ.

Page 10. Paragraphs 3-1, 3-2, and 3-3 aresuperseded as follows:

3-1. Scope of Operators MaintenanceThe maintenance duties assigned to theoperator are listed below, together with areference to the paragraphs covering the spe-cific maintenance functions. The required ma-terials are listed in paragraph 3-4.

a. Operators preventiveand services (para 3-5).

b. Cleaning (para 3-7).

maintenance checks

3-2. Operators Preventive MaintenancePreventive maintenance is the systematic care,servicing, and inspection of equipment to pre-vent the occurrence of trouble, to reducedowntime, and to assure that the equipment isin serviceable condition. To assist in maintain-ing serviceability, the chart (para 3-5) indicateswhat to check, how to check, and what thenormal conditions are. If the defect cannot beremedied, higher category maintenance or re-pair is required. Records and reports of thesechecks and services must be made in accordancewith the requirements set forth in TM 38-750.The procedures given in paragraph 3-5 coverroutine systematic care and cleaning for properupkeep and operation of the equipment.

3-3. Operators Preventive MaintenanceChecks and Service Periods

a. To be sure that your static ringinggenerator is ready for your mission, you must doscheduled preventive maintenance checks andservices (PMCS) as follows:

(1) BEFORE OPERATION, perform your(B) PMCS to be sure that your equipment isready to go.

1

(2) WEEKLY (W) and MONTHLY (M)PMCS are important checks you make to keepserious problems from suddenly happening.

NOTERoutine checks like cleaning, dusting,washing, checking for frayed cables,stowing items not in use, coveringunused receptacles and checking forloose nuts and bolts are not listed asPMCS checks. They are things that youshould do anytime you see they must bedone.

b. If you find a routine check like one of thoseabove listed in your PMCS, it was listed becauseother operators reported problems with thisitem. When you are doing any PMCS or routinechecks, keep in mind the warnings and cautions.

NOTESIf your equipment must be kept incontinuous operation, check and serv-ice those items that can be checked and

serviced without disturbing operation.Make the complete checks and serviceswhen the equipment can be shut down.

Use the ITEM NO column in yourPMCS table as a source of numbers forthe TM ITEM NO. column on DA Form2404 (Equipment Inspection and Main-tenance Worksheet) in recording re-sults of PMCS.

Page 11. Paragraph 3-5 is superseded asfollows:

3-5. Operators Preventive MaintenanceChecks and Services Chart

NOTEWhen organizational maintenanceduties are the same as the equipmentoperator, organizational maintenancewill perform the operators PMCS.

Perform the following checks before operation and weekly if(1) You are the assigned operator and have not operated the item since the last weekly.(2) You are operating the items for the first time.(W) Weekly

ItemNo.

1 x Equipment Operation

Procedures

Perform an equipment operation checkcheck by using the telephonecentral office equipment as thepower source and listen to the20-cps output. Theoutput should be clearand interrupted.

Paragraph 3-8 is superseded as follows:

3-8. Scope of Organizational Mainte-nance

The maintenance duties assigned to the organi-zational repair technician are listed below,together with a reference to the paragraphscovering the specific maintenance functions.The required materials are listed in paragraph3-9.

a. Organizational preventive maintenancechecks and services (para 3-12).

b. Touchup painting (para 3-13).c. Replacement of fuses (para 3-14).Page 12. Paragraphs 3-10.3-11, and 3-12 are

superseded as follows:

2

Equipment is not ready/Available If

Equipment fails to operateproperly.

3-10. Organizational Preventive Mainte-nance

Preventive maintenance is the systematic care,servicing, and inspection of equipment to pre-vent the occurrence of trouble, to reducedowntime, and to assure that the equipment isin serviceable condition. To assist in maintain-ing serviceability, the chart (para 3-12) indicateswhat to check, how to check, and what thenormal conditions are. If the defect cannot beremedied, higher category maintenance or re-pair is required. Records and reports of thesechecks and services must be made in accordancewith the requirements set forth in TM 38-750.

The procedures given in paragraph 3-12 coverroutine systematic care and cleaning for properupkeep and operation of the equipment.

3-11. Organizational Preventive Mainte-nance Checks and Service Periods

a. To be sure that your static ringinggenerator is ready for your mission, you must doscheduled preventive maintenance checks andservices (PMCS) quarterly.

NOTERoutine checks like cleaning, dusting,washing, checking for frayed cables,stowing items not in use, coveringunused receptacles and checking forloose nuts and bolts are not listed asPMCS checks. They are things that youshould do anytime you see they must bedone.

b. If you find a routine check like one of thoseabove listed in your PMCS, it was listed becauseother operators reported problems with thisitem. When you are doing any PMCS or routinechecks, keep in mind the warnings and cautions.

NOTESIf your equipment must be kept incontinuous operation, check and serv-ice those items that can be checked andserviced without disturbing operation.Make the complete checks and serviceswhen the equipment can be shut down.

Use the ITEM NO column in yourPMCS table as a source of numbers forthe ITEM NO. column on DA Form2404 (Equipment Inspection and Main-tenance Worksheet) in recording re-sults of PMCS.

3-12. Organizational Preventive Maintenance Checks and Services Chart

NOTEPerform checks (Q) Quarterly.

ITEMNO.

1 x Modifications

PROCEDURES

Check DA Pam 310-7 to determine whether new applicable MWOshave been published. All URGENT MWOsmust be applied immediately. All NORMAL MWOs mustbe scheduled.

Page 19. Appendix is superseded as follows:

APPENDIX IREFERENCES

The following is a list of applicable references available to maintenance personnel of Static RingingGenerators TA-248/TT and TA-248A/TT.DA Pam 310-4 Index of Technical Manuals, Technical Bulletins, Supply Manuals

(Types 7, 8, and 9), Supply Bulletins and Lubrication Orders.DA Pam 310-7 US Army Index of Modification Work Orders.SB 11-573 Painting and Preservation Supplies Available for Field Use for

Electronics Command Equipment.TB SIG 222 Solder and Soldering.TB 43-0118 Field Instructions for Painting and Preserving Electronics Command

Equipment Including Camouflage Pattern Painting of ElectricalEquipment Shelters.

TM 11-2064 Panels BD-132, BD-132A, and Power Switchboard SB-361/TT.TB 11-6625-366-15 Operators, Organizational, DS, GS, and Depot Maintenance Manual:

Multimeter TS-352B/U.TM 38-750 The Army Maintenance Management System (TAMMS).

3

Appendix III is superseded asfollows:

APPENDIX IIIMAINTENANCE ALLOCATION

Section I. INTRODUCTION

A3-1. GeneralThis appendix provides a summary of themaintenance operations for TA-248/TT andTA-248A/TT. It authorizes categories of main-tenance for specific maintenance functions onrepairable items and components and the toolsand equipment required to perform each func-tion. This appendix may be used as an aid inplanning maintenance operations.

A3-2. Maintenance FunctionMaintenance functions will be limited to anddefined as follows:

a. Inspect. To determine the serviceability ofan item by comparing its physical, mechanical,and/or electrical characteristics with estab-lished standards through examination.

b. Test. To verify serviceability and to detectincipient failure by measuring the mechanicalor electrical characteristics of an item andcomparing those characteristics with prescribedstandards.

c. Service. Operations required periodically tokeep an item in proper operating condition; i.e.,to clean (decontaminate), to preserve, to drain,to paint, or to teplenish fuel, lubricants, hydrau-lic fluids, or compressed air supplies.

d. Adjust. To maintain, within prescribedlimits, by bringing into proper or exact position,or by setting the operating characteristics to thespecified parameters.

e. Align. To adjust specified variable elementsof an item to bring about optimum or desiredperformance.

f. Calibrate. To determine and cause correc-tions to be made or to be adjusted on instru-ments or test measuring and diagnosticequipments used in precision measurement.Consists of comparisons of two instruments, oneof which is a certified standard of knownaccuracy, to detect and adjust any discrepancyin the accuracy of the instrument being com-pared.

4

g. Installfixing into(componentthe propersystem.

The act of emplacing, seating, orposition an item, part, module

or assembly) in a manner to allowfunctioning of the equipment or

h. Replace. The act of substituting a service-able like type part, subassembly, or module(component or assembly) for an unserviceablecounterpart.

i. Repair. The application of maintenanceservices (inspect, test, service, adjust, align,calibrate, replace) or other maintenance actions(welding, grinding, riveting, straightening,facing, remachining, or resurfacing) to restoreserviceability to an item by correcting specificdamage, fault, malfunction, or failure in a part,subassembly, module (component or assembly),end item, or system.

j. Overhaul . That maintenance e f for t(service/action) necessary to restore an item to acompletely serviceable/operational condition asprescribed by maintenance standards (i.e.,DMWR) in appropriate technical publications.Overhaul is normally the highest degree ofmaintenance performed by the Army. Overhauldoes not normally return an item to like newcondition.

k. Rebuild. Consists of those services/actionsnecessary for the restoration of unserviceableequipment to a like new condition in accordancewith original manufacturing standards. Re-build is the highest degree of materiel mainte-nance applied to Army equipment. The rebuildoperation includes the act of returning to zerothose age measurements (hours, miles, etc.)considered in classifying Army equipments/components.

A3-3. Column Entriesa. Column 1, Group Number. Column 1 lists

group numbers, the purpose of which is toidentify components, assemblies, subas-

semblies, and modules with the next higherassembly.

b. Column 2, Component/Assembly. Column 2contains the noun names of components, as-semblies, subassemblies, and modules for whichmaintenance is authorized.

c. Column 3, Maintenance Functions.. Column3 lists the functions to be performed on the itemlisted in column 2. When items are listed withoutmaintenance functions, it is solely for purpose ofhaving the group numbers in the MAC andRPSTL coincide.

d. Column 4, Maintenance Category. Column 4specifies, by the listing of a work time figure inthe appropriate subcolumn(s), the lowest level ofmaintenance authorized to perform the func-tion listed in column 3. This figure representsthe active time required to perform that main-tenance function at the indicated category ofmaintenance. If the number or complexity of thetasks within the listed maintenance functionvary at different maintenance categories, ap-propriate work time figures will be shown foreach category. The number of task-hoursspecified by the work time figure representsthe average time required to restore an item(assembly, subassembly, component, module,end item or system) to a serviceable conditionunder typical field operating conditions. Thistime includes preparation time, troubleshootingtime, and quality assurance/quality control timein addition to the time required to perform thespecific tasks identified for the maintenancefunctions authorized in the maintenance alloca-tion chart. Subcolumns of column 4 are asfollows:

C Operator/CrewO OrganizationalF Direct SupportH General SupportD Depot

e. Column 5, Tools and Equipment. Column 5specifies by code, those common tool sets (notindividual tools) and special tools, test, andsupport equipment required to perform thedesignated function.

f: Column 6, Remarks. Column 6 contains analphabetic code which leads to the remark insection IV, Remarks, which is pertinent to theitem opposite the particular code.

A3-4. Tool and Test Equipment Require-ments (See III).

a. Tool or Test Equipment Code. The numbersin this column coincide with the numbers used inthe tools and equipment column of the MAC.The numbers indicate the applicable tool or testequipment for the maintenance functions.

b. Maintenance Category. The codes in thiscolumn indicate the maintenance categoryallocated the tool or test equipment.

c. Nomenclature. This column lists the nounname and nomenclature of the tools and testequipment required to perform the mainte-nance functions.

d. National/NATO Stock Number. This columnlists the National/NATO stock number of thespecific tool or test equipment.

e. Tool Number. This column lists the manu-facturers part number of the tool followed bythe Federal Supply Code for manufacturers(5-digit) in parentheses.

A3-5. Remarks (See IV).a. Reference Code. This code refers to the

appropriate item in section II, column 6.b. Remarks. This column provides the re-

quired explanatory information necessary toclarify items appearing in section II.

Page 26. Appendix IV is deleted in its entirety.

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SECTION II MAINTENANCE ALLOCATION CHART

SECTION III TOOL AND TEST EQUPMENT REQUIREMENTS

7

Paragraph Page

CHAPTER 1. INTRODUCTION

Section I. GeneralScope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Index of equipment publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Section II. Description and dataPurpose and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

CHAPTER 2. INSTALIATIONMounting of TA-248 TT or TA-248A/TT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

555

55

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CHAPTER 3. OPERATORS AND ORGANIZATIONAL MAINTENANCEINSTRUCTIONS

Section I. Operators maintenanceScope of operators maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 10Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2 10Preventive maintenance checks and services periods . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 10Materials required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 10Operators daily preventive maintenance checks and services . . . . . . . . . . . . . . . . . . . 3-5 11Operators weekly preventive maintenance checks and services . . . . . . . . . . . . . . 3-6 11Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-7 11

Section II. Organizational maintenanceScope of organizational maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 11Materials required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 11Organizational preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-10 12Monthly maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-11 12Organizational monthly preventive maintenance checks and services . . . . . . . ...3-12 12Touchup painting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-13 13Fuse replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-14 13

CHAPTer 4. DIRECT SUPPORT, GENERAL SUPPORT, ANDDEPOT MAINTENANCE

Maintenance procedures.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Burnishing vibrator contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Contact-adjusting screw adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4-3Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Parts replacement . . . . . . . . . . . . . . . . . . . 4-5

CHAPTER 5. DEMOLITION OF MATERIAL. TO PREVENT ENEMY USEAuthority for demolition. . . . . . . . ...... .. . . . . . . . . . . . . 5-1Methods of destruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

APPENDIX I. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . .II. BASIC ISSUE ITEMS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

III. MAINTENANCE. ALLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .IV. REPAIR PARTS AND SPECIAL TOOL LISTS . . . . . . . . . . . . . . . . . . . . . . . . . . .

1414141515

1818

19202226

3

Figure 1-1. Static Ringing Generator TA-248/TT, cover removed.

4

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1-1. ScopeThis manual describes Static Ringing Gen-

erators TA-248/TT (fig. 1-1 and 1-2) andTA-248A/TT (fig. 1-2 and 1-3) and con-tains installation, operation, and maintenanceinstructions. A basic issue items list is pro-vided in appendix II; a maintenance allocationchart is provided in appendix III; and repairparts and special tool lists are provided inappendix IV.

1-2. Forms and Recordsa. Reports of Maintenance and Unsatisfac-

tory Equipmentent. Use equipment forms andrecords in accordance with the instructionsin TM 38-750.

b. Report of Damaged or Improper Shipment.Fill out and forward DD Form 6 (Report ofDamaged or Improper Shipment) as prescribedin AR 700-58 (Army), NAVSANDA Publica-tion 378 (Navy), and AFR 71-4 (Air Force).

c. Reporting of Equipment Manual Improve-ments. The direct reporting of errors, omis-sions, and recommendations for improving this

equipment manual by the individual user isauthorized and encouraged. DA Form 2028will be used for reporting these improvements.This form may be completed using pencil, pen,or typewriter. DA Forms 2028 will be com-pleted by the individual using the manual andforwarded direct to Commanding General,U. S. Army Electronic Command, ATTN:AMSEL-MR-(NMP)-MA, Form Monmouth,New Jersey 07703.

1-3. Index of Equipment publications

Refer to the latest issue of DA Pam 310-4 todetermine whether there are new editions,changes, or additional publications pertainingto the equipment. Department of the ArmyPamphlet No. 310-4 is an index of current tech-nical manuals, technical bulletins, supplymanuals (types 7, 8, and 9), supply bulletins,lubrication orders, and modification workorders available through supply channels. Theindex lists the individual parts (-10, -20, -35P,etc. ) and the latest changes to and revisionsof each equipment publication.

Section II. DESCRIPTION AND DATA

1-4. Purpose and Use

Static Ringing Generators TA-248/TT andTA-248A/TT are the vibrating-reed type of fre-quency converters for supplying 30 watts ofpower at 90 volts and 20 cycles per second(cps) alternating current (at) to ringing equip-ment from a 110- to 115-volt ac, 60-cps powersource in the telephone central office equip-ment installation. The TA-248/TT and TA-248A/TT are used in telephone central officeequipment; however, in some applications, theunits are furnished independently and can bemounted on a wall a short distance from theequipment with which the unit is to be used.

1-5.Description

a. Static Ringing Generator TA-248/TT(fig. 1-1 and 1-2). The TA-248/TT is inclosedin a cast-aluminum housing 10 inches long,4-3/8 inches wide, and 4-1/8 inches deep, andweighs 7-1/2 pounds. The housing consistsof a removable cover and mounting base. Thebase can be mounted on an adapter plate. Thetwo 5-ampere cartridge fuses are mounted ona fuse block on the rear of the adapter mount-ing plate. Two holes, one for inserting the in-put leads and the other for the output leads,are located at the bottom of the base. Thetransformer and panel assembly are mounted

5

fig. 1-2

fig. 1-3

fig. 1-1

fig. 1-2 and 1-3

xyz

6

Figure 1-2. Static Ringing Generator TA-248/TT orTA-248A/TT, rear view, cover removed.

Figure 1-3. Static Ringing Generator TA-248A/TT, front view, cover removed.

7

CHAPTER 2

INSTALLATION

2-1. Mounting of TA-248/TT or TA-248A/TT

a. Mounting. Select a location to mount theTA-248/TT or TA-248A/TT on a wall near theequipment with which it is to be used (fig.2-1). Make certain that the selected locationis Sufficiently high to assure that personnel donot accidentally disturb the operation of theTA-248/TT or TA-248A/TT by coming in con-tact with it. Mount the TA-248/TT or TA-248A/TT as fallows:

(1)

(2)

(3)

Position the TA-248/TT or TA-248A-TT at the selected location on the wall.Insert a No. 8 roundhead screw (ei-ther 1-inch or 1-1/2 inch, dependingon the wall thickness) into one ofthe holes in the mounting bracket.Tighten the screw to secure the unitto the wall.Repeat the procedure given in (2)above for each of the other mountingscrews. Tighten each of the mountingscrews (located at the top and bottomof the mounting base) until the baseis seated securely against the wall.

2-2. Connections

a. TA-248A/TT (fig. 1-3). To connect theTA-248A/TT for operation, follow the pro-cedures in steps (1) through (8) below.

(1) Remove the cover from the housingof the TA-248A/TT.

(2) Connect a pair of No. 18 AWG strand-ed wires (Federal Stock No. 6145-160-6212) of proper length to the OUT-PUT terminals on the panel. (Use

(3)

(4)

(5)

(6)

(7)

(8)

OUTPUT terminals 2 and C for 90-volt ringing signals).Thread the two output wires throughthe left rubber grommet on the bot-tom of the mounting baseConnect the other ends of the outputwire pair to the appropriate termi-nals of the associated equipment.Remove the mounting strip belowtransformer T1 to expose theINPUT terminal lugs.Connect a pair of No. 18 AWG strand-ed wires of proper length to the IN-PUT terminal lugs.Thread the two input wires throughthe right rubber grommet on thebottom of the mounting base.Connect the other ends of the inputwires to an appropriate ac powerconnector or receptacle.

b. TA-248/TT (fig. 1-1). To connect the TA-248/TT for operation, follow the procedures insteps (1) through (3) below.

(1)

(2)

(3)

Perform the procedures given in b(1) through (7) above.Connect the other ends of the INPUTwires to the left sides of fuses F1 andF2 on the fuse block located on therear of the adapter mounting panel.

Connect a pair of No. 18 AWG strand-ed wires of the proper lengths fromthe right sides of fuses F1 and F2 onthe fuse bock to an appropriate acpower connector or receptacle.

8

Figure 2.1. Typical installation when not mounted as part of telephone central office equipment.

9

CHAPTER 3

OPERATORS AND ORGANIZATIONAL MAINTENANCEINSTRUCTIONS

Section I. OPERATORS MAINTENANCE

3-1. Scope of Operators Maintenance

The maintenance duties assigned to the op-erator are listed below, together with a refer-ence to the paragraphs covering the specificmaintenance functions. The required materi-als are listed in paragraph 3-4.

a. Operators daily preventive maintenancechecks and services (para 3-5).

b. Operators weekly preventive maintenancechecks and services (para 3-6).

c. Cleaning (para 3-7).

3.2. Preventive Maintenance

Preventive maintenance is the systematiccare, servicing, and inspection of the equipment to prevent the occurrence of troubles, re-duce downtime, and to assure that the equip-ment is serviceable.

a. Systematic Care. The procedure given inparagraphs 3-5, 3-6, and 3-7 cover routine sys-tematic care and cleaning essential to properupkeep and operation of the unit.

b. Preventive Maintenance Checks and Serv-i c e s . The preventive maintenance checks andservices charts ( para 3-5 and 3-6) outline func-tions to be performed at specific intervals.These checks and services are to maintainArmy electronic equipment in a combat-service-able condition ; that is, in good general (physi-cal) condition and in good operating condition.To assist operators in maintaining combatserviceability, the charts indicate what tocheck, how to check, and what the normal con-ditions are; the References column lists the il-

lustrations or paragraphs that contain supple-mentary information. If the defect cannot beremedied by the operator, higher level of main-tenance or repair is required. Records and re-ports of these checks and services must bemade in accordance with the requirements setforth in TM-38-750.

3-3. Preventive Maintenance Checks andServices Periods

Preventive maintenance checks and servicesof the equipment are required on a daily andweekly basis.

a. Paragraph 3-5 specifies the checks andservices that must be accomplished daily andunder the following conditions:

(1)

(2)

(3)ment is maintained in a standbycondition.

b. Paragraph 3-6 specifies the checks andservices that must be accomplished weekly.

3-4. Materials RequiredThe following materials are required for op

erators preventive maintenance:u. Brush, paint l/2-inch width (Federal

Stock No. 8020-262-9084).b. Cleaning Compound (Federal stock No.

7930-395-9542).c. Lint-free cloth.

10

3-5. Operators Daily Preventive Maintenance Checks and ServicesSequence

1

2

3

Item

Case exterior . . . . . . . . . . . . . . . . . . . . .

Mounting screws and washers . . . . . .

Operation . . . . . . . . . . . . . . . . . . . . . . . . .

ProcedureWarning: Prolonged breathing of cleaning

compound is dangerous; make certain that ade-quate ventilation is provided. Cleaning com-pound is flammable; do not use near a flame.Avoid contact with the skin; wash off any thatspills on your hands.Inspect for cleanliness. Remove loose dust and

dirt with a clean dry cloth or brush. Re-move other dirt with a cloth dampened (notwet) with cleaning compound. Wipe cleanedsurface with a clean dry cloth.

Inspect for loose mounting screws, washers, orbolts.

Listen to the 20-CPS output. It should be clear

References

Para 3-7

None.

None.and uninterrupted. I

3-6. Operators Weekly Preventive Maintenance Checks and Services

SequenceNo.

1Item

Case exterior . . . . . . . . . . . . . . . . . . ..O

2 Fuses and fuseholders . . . . . . . . . . . . .

3 Input and output wiring . . . . . . . . .

3-7. Cleaning

Procedure References

a. Inspect exterior surfaces for signs of rust a. None.and corrosion. Refer to higher level main-tenance for refinishing.

b. Inspect for bent, dented, or otherwise dam- b. None.aged surfaces.

Inspect fuses for proper size and type. Inspect Fig. 1-1, 1-2,fuseholder for cracked or loose cap or holder. and 1-3.

Inspect input and output wire pairs for frays, Fig. 1-1, 1-2,cracks, looseness, or breaks. Inspect for loose and 1-3.or broken connections.

a. Remove dust and loose dirt with a cleanlint-free cloth or brush,

Inspect exterior surfaces of the TA-248/TT b. Remove grease, fungus, and ground-inand TA-248A/TT. The exterior surfaces should dirt from the cases; use a cloth dampened (notbe free of dust, dirt grease, and fungus wet) with cleaning compound.

Section Il. ORGANIZATIONAL MAINTENANCE

3-8. Scope of Organizational Maintenance

a. Paragraphs 3-9 through 3-14 contain in-structions covering organizational mainte-nance of the equipment and includes instruc-tions for performing preventive maintenanceservices and repair functions to be accom-plished by the organizational repairman.

b. Organizational maintenance of the equip-ment consists of the following:

(1)

(2)

Inspection and cleaning of interiorSurfaces.

Visual inspection of vibrator opera-tion,

(3) Replacement of defective fuses.

(4) Touchup painting.

3-9. Materials Required.

a. Cleaning compound.

b. Lint-free cloth.

c. Fine sandpaper, #000.

d. Paint, Enamel, Black, semigloss (FederalStock No. 8010-844-4792 ) or Paint Enamel,Black, Lusterless (Federal Stock No. 8010-887-3636).

e. Brush. paint, l /2- inch width (FederalStock No. 8020-262-9084) .

11

3-10. Organizational Preventive Mainte-nance

a. Preventive maintenance is the system-atic care, inspection, and servicing of the equip-ment to maintain it in serviceable condition,prevent breakdowns, and assure maximum op-erational capability. Preventive maintenance isthe responsibility of all levels concerned withthe equipment and includes the inspection,testing, and repair of the equipment parts thattests indicate would probably fail before thenext scheduled periodic service. Preventivemaintenance checks and services of the equip-ment at the organizational level are made atmonthly intervals unless otherwise specifiedby the commanding officer. The preventivemaintenance checks and services should bescheduled concurrently with the periodic serv-ices schedule of the associated equipment inthe system.

b. Maintenance forms and records to be used

and maintained on this equipment are speci-fied in TM 38-750.

3-11. Monthly MaintenancePerform the maintenance functions indicat-

ed in the monthly preventive maintenancechecks and services chart (para 3-12) once eachmonth. A month is defined as approximately30 calendar days of 8-hour-per-day operation.If the equipment is operated 16 hours per day,the monthly preventive maintenance checksand services should be performed at M-day in-tervals. Adjustment of the maintenance inter-vals must be made to compensate for any un-usual operating conditions. Equipment maint-ained in a standby (ready for immediate op-eration) condition must have monthly pre-ventive maintenance checks and services per-formed on it. Equipment in limited storagedoes not require monthly preventive mainte-nance, but does require services before opera-tion.

3-12. Organizational Monthly Preventive Maintenance Checks and ServicesSequence

No.1

2

3

4

6

6

7

8

12

ItemCase interior . . . . . . . . . . . .

Wiring and components . . . . . . . . .

Terminals, terminal lugs, and com-ponent mounting screws . . . .

Incandescent lamp . . . . . . . . . . . . .

Transformer, choke, resistors, andcapacitors . . . . . . . . . . . . . . . . . . .

Terminal mounting board . . . . . . .

Publications . . . . . . . . . . . . . . . . . . .

Modifications . . . . . . . . . . . . . . . . .

ProcedureWarning: Prolonged breathing of cleaning

compound is dangerous; make certain that ade-quate ventilation is provided. Cleaning com-pound is flammable; do not use near a flame.Avoid contact with the skin; wash off any thatspills on your hands.

a. Inspect for cleanliness. Clean as required.

b. Inspect interior surfaces for rust or cor-rosion, Remove rust and corrosion, andrepaint metal surfaces as required.

Inspect wiring and components for broken,shorted, or open connections or other damage.

Caution: Do not disturb the position of thecontact-adjusting screw.Inspect for completeness and proper tightness,

Inspect the incandescent lamp for secure mounying in the socket.

Inspect for signs of damage (leaks, bulges,or charred insulation).

Inspect for loose connections and cracked orbroken insulation.

Check to see that all publications are completeserviceable, and in usable condition.

Check DA Pam 310-4 to determine whether newapplicable MWO's have been published. Allurgent MWOs must be applied immediatelyAll NORMAL MWOs must be scheduled.

References

a. Fig. 1-1, 1-2,and 1-3; andpara 3-7.

b.. Fig. 1-1, 1-2,and 1-3; andpara 3-13 ;and TB SIG364.

Fig. 1-1, 1-2, and1-3.

Fig. 1-1, 1-2, and1-3.

Fig. 1-1, 1-2, and1-3.

Fig. 1-1, 1-2, and1-3.

Fig. 1-1, 1-2, and1-3.

DA Pam 310-4.

DA Pam 310-4.and TM 38-760.

3-13. Touchup Painting

Remove rust and corrosion from metal sur-facez by lightly sanding them with fine sand-paper. Brush two thin coats of paint on thebare metal to protect it from further corrosion.Refer to the applicable cleaning and refinish-ing practices specified in TB SIG 364. Refer toparagraph 3-9 and SB 11-573 for applicable Fed-eral Stock numbers.

3-14. Fuse Replacement

a.. Replacement of Fues (TA-248/TT). T oreplace the cartridge-type fuses mounted in thefuseholder on the mounting plate, proceed asfollows :

(1)

(2)

(3)

Remove the 115-volt ac, 60-cps powerfrom the unit.Reach behind the mounting plate andremove the fuse from its mounting inthe block-type fuseholder.Replace the fuse with one of the cor-rect rating (5-ampere, 250-volt).

(4) Apply 115-volt ac, 60-cps power to theunit.

b. Replacement of Fuses, (TA-248A/TT)(fig. 1-3). To replace the 3-ampere, 250-voltcartridge fuses in the TA-248A/TT, proceed asfollows :

(1)

(2)

(3)

(4)

(5)

(6)

Remove the 115-volt ac, 60-Cps powerfrom the unit.Depress the fuseholder cap toward thefuseholder and turn the cap one-fourth turn counterclockwise.Pull the fuseholder cap away fromthe fuseholder.Remove the cartridge-type fuse fromthe fuseholder cap and replace thefuse with a new 3-ampere, 250-voltfuse.

Replace the fuseholder cap on thefuseholder. Depress and turn the capone-fourth turn in a clockwise direc-tion.Apply 115-volt, 60-cps power to theunit.

13

CHAPTER 4

DIRECT SUPPORT, GENERAL SUPPORT,

AND DEPOT MAINTENANCE

4-1. Maintenance Procedures

a. The following procedures are required atthe direct, support, general support, and depotmaintenance levels.

b. The vibrator contacts are the most likelysource of trouble. If the vibrator contacts be-come dirty, they will disrupt the vibratingfrequency of the reed and will distort the out-put. The vibrator contacts should be burn-ished at weekly intervals to assure proper op-eration of the vibrator. If the vibrating fre-quency of the reed is erratic or distorted, burn-ish the contacts as indicated in paragraph 4-2.If the unit remains inoperative after the con-tacts have been burnished, perform the adjust-ment procedures given in paragraph 43.

4-2. Burnishing Vibrator Contacts

a. Disconnect the 115-volt ac, 60-cps powerfrom the unit.

b. Remove the cover from the TA-248/TTor TA-248A/TT.

c. Burnish the vibrator contacts very light-ly with a burnishing tool.

Caution: Never file the contact points. Fil-ing will damage the contact surfaces.

d. Reconnect the 115-volt ac, 60-cps power tothe unit.

e. Observe the reed vibration. If the reedfails to vibrate or the frequency remains er-ratic and distorted, adjust the contact-adjust-ing screw as indicatedd in paragraph 43.

4-3. Contact-Adjusting Screw Adjustment

a. General. The only adjustment that is re-quired in the TA-248/TT or TA-248A/TT isthe contact-adjusting screw adjustment. TheTA-248/TT and TA-248A/TT are preadjustedbefore they are received by the using organi-zation. Additional initial adjustment is usuallynot necessary. Do not make this adjustment

14

unless it is obvious that it is necessary. Ad-justment of the contact-adjusting screw isnecessary when the reed vibrates in a surgingor intermittent manner or when the sparkingoccurs between the contact points. If the ad-justment is required, only a slight clockwiseor counterclockwise turn of the contact-adjust-ing screw is required (refer to b below for theadjustment procedures). The adjustment ofthe contacts of these units is different fromthe adjustment of contacts of similar vibratorpower ringers, since, in these units, the contactgap must be kept as tide as possible. Closingthe contact gap will not increase the outputfrequency or amplitude, but will cause spark-ing and rf interference and can prevent re-starting of the ringer. If adjustment is re-quired, refer to the adjustment procedures giv-en in b below.

b. Adjustment.Caution: A weight of the pendulum type

(fig. 1-3) is attached to the lower end of thereed. Never attempt to change the positionof the weight on the reed. The weight is prop-erly positioned to insure efficient pendulum

action.(1)

(2)

(3)

(4)

(5)

(6 )

Remove the cover from the TA-248/-TT or TA-248A/TT.

Carefully turn the contact-adjustingscrew slightly clockwise or counter-c lockwise unti l the vibrating-reedfrequency is uniform and the reedvibrates continuously.

After the adjustment has been made,remove the 115-volt ac, 60-cps powerfrom the unit.

Reapply power to the unit.

Observe that the reed vibrates uponreapplication of power to the unit; ifit does not, readjust the contact-ad-justing screw slightly ( (2) above).

Repeat the procedures given in (3),(4), and (5) above. If the reed fails

to vibrate after the readjustment,per f o rm the t r oub leshoo t ing pro -cedure indicated in paragraph 4-4.

4-4. Trouble-shooting Procedures

a. Remove the 115-volt ac, 60-cps power fromthe unit.

b. Check fuses F1 and F2 (para 3-14). Makecertain that the fuses are not defective, and areof the correct rating (appx II). Make certainthat the fuses are secured in their fuseholders.

c. Make certain that the incandescent lampis securely tightened in its socket.

d. Check the ac power cord and plug forloose or frayed wires or loose or broken pins.

4-5. Parts Replacement

a. Replacement of Reed in Vibrator-Reed As-sembly (TA-248/TT or TA-248A/TT) (fig. 1-1and 1-3).

(1)

(2)

(3)

(4)

(5)

(6)

(7)

Remove the 115-volt ac, 60-cps powerfrom the unit.

Remove the binding post head fromthe retaining screw.

Remove the reed from the retainingscrew.

Install a new reed and secure it inposition with the binding post headand retaining screw.

Make certain that the reed touches,and is in exact alignment with, thec o n t a c t o f the oontact-adjustingstraw.

Apply 115-volt ac, 60-cps power tothe unit.

Adjust the contacts of the vibrating-reed assembly by backing out the con-tact-adjusting screw until the reedis motionless; then slowly turn the

contact-adjusting screw in until thecontacts just meet and the reed vi-brates steadily without sparking(para 4-3).

b. Replacement of Contact-Adjusting Screwand Spring ( TA-248/TT or TA-248A/TT) (fig.1-1 and 1-3).

(1)

(2)

(3)

(4)

(5)

Remove the 115-volt ac, 60-cps powerfrom the unit.

Remove the contact-adjusting screwby turning it counterclockwise. Re-move the spring with the contact-ad-justing screw.

Place a new spring on the contact-ad-justing screw and replace the con-tact-adjusting screw by turning it ina clockwise direction.

Apply 115-volt ac, 60-cps power to theunit.

Adjust the contacts by slowly turningthe contact-adjusting screw until thecontacts just meet and the reed vi-brates steadily without sparking(para 4-3).

e. Replacement of Incandescent Lamp (TA-248/TT or TA-248A/TT) (fig. 1-2).

(1) Remove the 115-volt ac, 60-CPS p o w e r

(2)

(3)

(4 )

(5)

(6)

from the unit.

Remove the cover from the unit.

Turn the lamp in a counterclockwised i re c t i on and remove i t f r om i t ssocket.

Place a new lamp in the socket andturn it in a clockwisesecure it in its socket.

Replace the cover andposition over the unit.

Apply 115-volt ac, 60-cpsunit.

direction to

secure it in

power to the

15

Figure 4-1. Static Ringing Generator TA-248/TT or TA-248A/TT, schematic diagram.

16

Figure 4-2. Static Ringing Generator TA-248/TT or TA-248A/ TT, wiring diagram.

17

CHAPTER 5

DEMOLITION OF MATERIEL TO PREVENT ENEMY USE

5-1. Authority for Demolition

Demolition of the equipment will be ac-complished only upon the order of the com-mander. The destructing procedures outlinedin paragraph 5-2 will be usd to prevent fur-ther use of the equipment,

5-2. Methods of Destruction

Use any of the following methods to destroythe equipment:

a. Smasin.. Smash the capacitors, transform-er, resistors, incandescent lamp, choke, fuse-holders, fuses, terminal boards, and case.

b. Cut. Cut the output and input wires andcables and the circuit wiring.

c. Burn. Burn the cords anduals.

d. Bend. Bend the panel, thebase.

technical man-

cover, and the

Warning: Be extremely careful with ex-plosives and incendiary devices. Use theseitems only when the need is urgent.

e. Explode. If necessary, use explosives.f. Dispose. Bury or scatter the destroyed

parts in slit trenches or foxholes, or throwthem into nearby streams.

18

APPENDIX I

REFERENCES

The following is a list of applicable refer-ences available to the operator, organizational,direct and general support, and depot mainte-nance personnel of Static Ringing GeneratorsTA-248/TT and TA-248A/TT.

AR 750-5 Organization, Policies, and Responsibilities forMaintenance Operations.

DA Pam 310-4 Index of Technical Manuals, Technical Bul-letins, Supply Manuals (types 7, 8, and 9),Supply Bulletins, Lubrication Orders, andModification Work Orders.

Tool Equipment TE-49.SB 11-183

SB 11-573

TA 11-17

TA 11-100 (11-17)

TA 11-101 (11-158)

TB SIG 222

TB SIG 364

TM 11-2064

TM 11-5527

TM 38-75C

TOE 11-158D

Painting and Preservation Supplies Availablefor Field Use for Electronics CommandEquipment.

Signal Field Maintenance Shops.

Allowances of Signal Corps Expendable. Supplies for Signal Field Maintenance Shops(Continental United States).

Allowances of Signal Corps Expendable Sup-plies for Signal Depot Company.

Solder and Soldering.

Field Instructions for Painting and PreservingElectronics Command Equipment.

Panels BD-132, BD-132-A, and Power Switch-board SB-361/TT.

Multimeters TS-352/U, TS-352A/U, and TS-352B/U.

Army Equipment Record Procedures.

Signal Depot Company.

19

APPENDIX II

BASIC ISSUE ITEMS LIST


A2-1. General

This appendix lists items supplied for initialoperation and for running spares. The list in-cludes tools, parts, and material issued as partof the major end item. The list includes allitems authorized for basic operator mainte-nance of the equipment. End items of equip-ment are issued on the basis of allowancesprescribed in equipment authorization tablesand other documents that are a basis for req-uisitioning

A2-2. Columns

Columns are as follows:

a. Federal Stock Number. This column liststhe 1 l-digit Federal stock number.

b. Designation by Model. The dagger (T) in-dicates model in which the part is used.

c. Description. Nomenclature or the stand-ard item. name and brief identifying data foreach item are listed in this column. When req-uisitioning, enter the nomenclature and de-scription.

d. Unit of Issue. The unit of issue is each un-less otherwise indicated and is the supply termby which the individual item is counted forprocurement, storage, requisitioning, allow-ances, and issue purposes.

e. Expendability. Nonexpendable items areindicated by NX. Expendable items are notannotated.

f. Quantity Authorized. Under Items Com-prising an Operable Equipment, the columnlists the quantity of items supplied for theinitial operation of the equipment. UnderRunning Spare Items the quantities listedare those issued initially with the equipmentas spare parts. The quantities are authorizedto be kept on hand by the operator for main-tenance of the equipment.

g. Illustration. The Item No. column liststhe reference designations that appear on thepart in the equipment. These same designationsare used on any illustrations of the equipment.The numbers in the Figure No. column referto the illustration where the part is shown.

20

Section II. OPER

ATOR

FUN

CTIO

NAL PAR

TS LIST

21

APPENDIX III

MAINTENANCE ALLOCATION


A3-1. General

a. This appendix assigns maintenance func-tions to be performed on components, assem-blies, and subassemblies by the lowest appro-priate maintenance category.

b. Columns in the maintenance allocationchart are as follows:

( 1 ) Par t o r c omponent . T h i s c o l u m nshows only the nomenclature or stand-ard item name. Additional descriptivedata are included only where clarifica-tion is necessary to identify the com-ponent. Components, assemblies, andsubassemblies are listed in top-downorder. That is, the assemblies whichare part of a component are listed im-mediately below that component, andsubassemblies which are part of an as-sembly are listed immediately belowthat assembly. Each generation break-down (components, assemblies, or sub-assemblies) is listed in disassembly or-der or alphabetical order.

(2) Maintenance function. This column in-dicates the various maintenance func-tions allocated to the categories.

(a) Service. To clean, to preserve, andto replenish lubricants.

(b) Adjust. To regulate periodically toprevent malfunction.

(c) Inspect. To verify serviceability anddetect incipient electrical or me-chanical failure by scrutiny.

(d) Test. To verify serviceability andto detect incipient electrical or me-chanical failure by use of specialequipment such as gages, meters,etc.

(e) Replace . To substitute serviceablecomponents, assemblies, o r s u b -assemblies, for unserviceable com-

22

( f )

( g )

(h )

( i )

( j )

ponents,blies.

Repair.iceable

assemblies, or subassem-

To restore an item to serv-condition through correc-

tion of a specific failure or unserv-iceable condition. This function in-cludes but is not limited to welding,grinding, riveting, straightening,and replacement of parts otherthan the trial and error replace-ment of running spare type itemssuch as fuses, lamps, or electrontubes.

Align. To adjust two or more com-ponents of an electrical system sothat their functions are properlysynchronized.

Calibrate. To determine, check, orrect i fy the graduation of an in-strument, weapon, or weapons sys-tem, or components of a weaponssystem.

Overhaul . To restore an item tocompletely serviceable condition asprescribed by serviceability stand-ards developed and published byheads of technical services. Thisis accomplished through employ-ment of the technique of Inspectand Repair Only as Necessary(IROAN). Maximum utilization ofdiagnostic and test equipment iscombined with minimum disassemb-bly of the item during the overhaulprocess.

Rebuild. To restore an item to astandard as near as possible tooriginal or new condition in appear-ance, performance, a n d l i f e e x -pectancy. This is accomplishedthrough the maintenance techniqueof complete disassembly of theitem, inspection of all parts or com-

ponents, repair or replacement ofworn or unserviceable elements us-ing original manufacturing toler-ances and/or specifications and sub-sequent. reassembly of the item.

(3) Operator, organization, direct support,general support, and depot. The sym-bol X indicates the categories re-sponsible for Performing that partic-ular maintenance operation, but doesnot necessarily indicate that repairparts will be stocked at that level.Categories higher than those markedby X are authorized to perform theindicated operation.

(4) Tools required. This column indicatescodes assigned to each individual toolequipment, test equipment, and main-tenance equipment referenced. Thegrouping of codes in this column ofthe maintenance allocation chart in-dicates the tool, test, and mainten-ance equipment required to performthe maintenance function.

(5) Remarks. Entries in this column willbe utilized when necessary to clar-

i fy any of the data cited in thepreceding column.

c. Columns in the allocation of tools formaintenance functions are as follows:

(1) Tools required for maintenance func-tions. This column lists tools, test, andmaintenance equipment required toperform the maintenance functions.

(2) Operator, organization, direct sup-port, general support, and depot. T h edagger ( ) symbo l ind i ca tes thecategories normally allocated the fa-cility.

(3) Tool code. This column lists the toolcode assigned.

(4) Remarks. Not used.

A3-2. Maintenance by Using Organizations

When this equipment is used by signal serv-ices organizations organic to theater headquar-ters or communication zones to provide theatercommunications, those maintenance functionsallocated up to and including general supportare authorized to the organization operatingthis equipment.

=--

23

Section II. MAIN

TENAN

CE ALLO

CATIO

N C

HAR

T

24

25

Section III. ALLO

CA

TION

OF TO

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APPENDIX IV

REPAIR PARTS AND SPECIAL TOOL LISTS


A4-1. General

a. This appendix includes organizational, di-rect and general support and depot mainte-nance special tool lists.

(1)

(2)

The organizational maintenance repairparts and special tool lists list thequantities of repair parts authorizedfor organizational maintenance and isa basis for requisitioning by organi-zations which are authorized themajor item of equipment. End itemsof equipment are issued on the basisof allowances prescribed in equipmentauthorization tables and other docu-ments that are a basis for requisi-tioning,

Direct and general support and depotmaintenance repair parts and specialtool lists list the quantities of repairparts authorized for direct and gener-al support maintenance and is abasis for requisitioning authorizedparts. It is a guide for depot main-tenance in establishing initial leveisof spare parts.

b. Columns are as follows:(1) Source, maintenance, and recoverabil-

ity code. Source, maintenance, and re-coverability codes indicate the techni-cal service responsible for supply, themaintenance categories at which anitem is stocked, categories at which anitem is installed or repaired, andwhether an item is repairable or sal-vageable. The source code column isdivided into four parts.

(a) Column A. This column indicatesthe materiel code and designates thearea of responsibility for supply.AR 310-1 defines the basic numbersused to identify the materiel code.

(b)

(c)

(d)

If the part is Signal materiel re-sponsibility, the column is leftblank.

Column B. This column indicates thepoint within the maintenance sys-tem where the part is available.P indicates that the repair partis a high mortality part; procuredby technical services, stocked inand supplied from the technicalservice depot system and author-ized for use at indicated mainte-nance categories.

Column C. This column indicates thelowest maintenance category au-thorized to install the part.O-Organizational maintenance(operator and organizational).F-Direct support maintenance,

Column D. Not used.(2)

(3)

(4)

(5)

(6)

Federal stock number. This columnlists the n-digit Federal stock num-ber.Designation by model. The dagger() indicates model in which thepart is used.Description. Nomenclature or thestandard item name and brief iden-tifying data for each item are listedin this column. When requisitioning,enter the nomenclature and descrip-tion.Unit of issue. The unit of issue iseach unless otherwise indicated andis the supply term by which the in-dividual item is counted for procure-ment, storage, requisitioning, allow-ances, and issue purposes.Expendability Nonexpendable itemsare indicated by NX. Expendableitems are not annotated.

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(7)

(8)

(9)

Quantity incorporated in unit. Thiscolumn lists the quantity of each partfound in a given assembly, compo-nent, or equipment.

Organizational. The quantities indicat-ed in this column are maximum lev-els of repair parts authorized to bekept on hand by units performingorganizational maintenance. Thequantities are based on 100 equip-ments to be maintained for a 15-dayperiod.

Direct support. This column indicatesquantities of repair parts authorizedfor initial stockage for use in the di-rect support maintenance and in sup-ply support to organization. Thequantities are based on 100 equip-ments to be maintained for a 15-dayperiod.

(10) General support. The numbers in thiscolumn indicate quantities of repairparts authorized for initial stockagefor use in general support mainte-nance. The quantities are based on100 equipments to be maintained fora 15-day period.

(11) Depot. The numbers in this columnindicate quantities of repair partsauthorized for depot maintenance andfor initial stockage for maintenance,and for supply support to lower cat-egories. The entries are based on thequantity required for rebuild of 100equipments,

(12) Figure. The numbers in this columnindicate the figure on which the itemis illustrated.

(13) ltem. This column indicates itemnumber designations.

A4-2. Parts for Maintenance

When this equipment is used by signal serv-ice organizations organic to the theater head-quarters or communication zones to providetheater communications, those repair parts au-thorized up to and including general supportare authorized for stockage by the organizationoperating this equipment.

A4-3. Additional Repair Parts Authorization

An asterisk (*) indicates that an item is notauthorized for stockage but, if required, maybe requisitioned for immediate use only.

A4-4. Requisitioning Information

(Organizational)

a. The al lowance factors are W on 100equipments. In order to determine the numberof parts authorized for the specific number ofequipments supported, the following formulawill be used and carried out to two decimalplaces.

Specific number of equipments supported xallowance factor

1100Number of parts authorized.

b. Fractional values obtained from abovecomputation will be rounded to whole numbersas follows :

(1)

(2)

When the total number of parts au-thorized is less than one, the quantityauthorized will be one.

For all values above one, fractionalvalues below 0.5 will revert to thenext lower number, fractional valuesof 0.5 or larger will advance to thenext higher whole number.

c. The number of parts authorized, deter-mined after- application of a and b above, rep-resent one prescribed load for a 15day period.The items and computed quantities thereofmust be on hand or on order at all times.

d. Major commanders will determine thenumber of prescribed loads organizational unitswi]] carry. Units and organizations authorizedadditional prescribed loads will utilize the for-mula explained in u above but will multiply thenumber of equipments supported by the num-ber of authorized prescribed loads before com-pleting the formula. Fractional values will berounded to whole numbers as described above.

A4-5. Requisitioning Information (Direct

and General Support Maintenance)

a. The allowance factors are based on 100equipments. In order to determine the number

27

of parts authorized for initial stockage for thespecific number of equipments supported, thefollowing formula will be used and carried outto two decimal places.

Specific numberof equipments supported xallowance factor

100 =

Number of parts authorized for initialstockage.

b. Fractional values obtained from abovecomputation will be rounded to whole numbersas follows :

(1) When the total number of parts au-

thorized is less than 0.5, the quantityauthorized will be zero.

(2) When the total number of parts au-thorized is between 0.5 and 1.0, thequantity authorized will be one.

(3) For all values above one, fractionalvalues below 0.5 will revert to thenext lower whole number and frac-tional value 0.5 and above will advanceto the next higher whole number.

c. The quantities determined in accordancewith the above computation represent the ini-tial stockage for a 15-day period.

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Section II. OR

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COLOR CODE MARKING FOR MILITARY STANDARD RESISTORS

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Figure 5-1. MIL-STD resistor color-code marking.

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Figure 5-2. MIL-STD capacitor color-code marking.

By Order of the Secretary of the Army:

Official:J. C. LAMBERT,Major General United States Army ,The Adjutant General.

HAROLD K. JOHNSON,General, United States ArmyChief of Staff.

35

PIN :028980-000

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