Detection Systems DS7092 Spécifications Page 1

TM 11-6625-496-45DEPARTMENT OF THE ARMY TECHNICAL MANUALFIELD (FOURTH ECHELON) AND DEPOTMAINTENANCE MANUALTEST SET, RADIO AN/VRM-lThis copy is a repri

R7902 IS R7923 (1100 OHMS ) WHEN POTENTICMETERS R7902 AND R7919AREPROVIDED ON CONTRACT DAAB05 -73 – 6 - 1632 (1973) ANDSUCEEDING CONTRACTS.EL4YC004Fig

By Order of the Secretary of the Army:Official:J. C. LAMBERT,Major General, United States ArmyThe Adjutant General.--Distribution:Active Army:USASA (2

TM 11-6625-496-45Technical ManualNo. 11-6625-496-45ParagraphC HAPTER 1.CHAPTER 2.Section I.II.III.IV.v.CHAPTER 3.Section I.II.HEADQUARTERS,DEPARTME

CHAPTER 1THEORY1. Scopea. This manual covers field (fourthechelon) and depot mainteriance for TestSet, Radio AN/VRM-l. It includes in-structions appr

S7902E. The 16 volts dc is supplied to theaudio amplifier or one of the rf amplifiersand the test probe rf preamplifier fromS7902E.3. Audio Amplifier(

(1)(2)(3)4Figure 1. Audio amplifier, schematic diagram.Transistor Q7602 receives its in-put from the secondary winding ofT7602. The input signal is co

Figure 2. Amplifier, 11.6-mc, schematic diagram.6. Amplifier, 5.65-Mc(fig. 3)The 5.65-mc amplifier is a single-stage if. amplifier which has a gain of

portion of the emitter-base biasand stabilizes the emitter current.Capacitor C7703 is an rf bypasscapacitor. Capacitor C7702 and in-ductor L7701 form

voltage divider which provides thefixed-hissing portion of emitter-base bias for Q7703. ResistorR7714 develops the self-biasingportion of the emitter-

PageParagraphChangeTo5957b(5)+4.0 volts+ 3.5 volts57b(6)+ 5.5 volts+ 5.0 volts57C(3)10.500 mc10.75 mc ±40 cps+ 1.0 volt dc ±0.30 3.00 volts dc ±0.0557

47.0-mc amplifier; diode CR7402, with the11.5-mc amplifier; and diode CR7403, withthe 5.65-mc amplifier. The diode associ-ated with the rf amplifier i

low-resistance path to them. When tran-sistor Q7801 is biased into conduction, itprovides a much lower path to ground thanthe diode network, and the d

Figure 7. Schmitt trigger circuit, schematic diagram.and rheostat R7816a. Resistor R7817form a voltage divider. Rheostat R7816 isadjusted SO that the

Figure 8. Line voltage sensing circuit, schematic diagram.diode CR7901 is also applied through ter-minal B of connectors J7907 and P7801 tothe line vo

under test or the TS-1777/VRM-l 16-voltline can be tested.a. When the TS-1777/VRM-l 16-voltline is tested, the test probe tip is insertedin test jack

Figure 9. Testsin selector switch positions A, 2, 3, and 7,simplified schematic diagram.13

minimum limit, GREEN indicator DS7902will light. If the signal voltage is below theminimum limit, insufficient voltage will beapplied to the Schmitt t

Figure 10. Tests in selector switch positions 8, 12, 13, 16, and 18 simplified schematic diagram.15

probe rf preamplifier is fed throughcoupling capacitor C7901 and attenuatingresistor R7911 to the 5.65-mc amplifier.The rectified output of the 5.65-m

CHAPTER 2FOURTH ECHELON MAINTENANCESection I. GENERAL TROUBLESHOOTING TECHNIQUESWarning: When servicing the TS-1777/VRM-1, be careful when working nea

(2)chart (para 34) and the schematic30. Test Equipment Requireddiagram (fig. 39) to find normalThe following chart lists equipment re-readings, and c

to the AN/VRM-l. Connect the AN/VRM-las follows:(1)(2)(3)Connect Mounting MT-1029/VRCto the output of the PP-2309/U;use the CX-4720/VRC. Connect thebl

para 34.para 34.para 36.para 43.para 37.20

34. Isolating Troubles in Switch S7902When trouble has been localized to S7902,is defective,it must be determined if the switch itselfcontacts andor i

or resistors between S7902A and S7902Bare defeotive.a. use the wiring diagram (fig. 11) andoheck for broken jumper leads betweenswitch oontacts and be

Figure 11.23

35. General PartsTechniquesAll the partsSection III.Replacementof Test Set, Radio AN/VRM-1 can be reached and replaced easilywithout special procedure

(3)make sure that the captive screwson the front panel line up with theholes In the gasket and the screwholes in the ease.Tighten the eight captive sc

b. Replacement of Chassis Bottom Plate(fig. 12 and 14).(1) Place the chassis bottom plate inposition so that the two studs onswitch S7902 extend thr

(2)(3)(4)Secure switch S7901; use the nutand lockwasher (k(3) above).Reconnect the two wires (k(2)above) .Replace the chassis cover plate14).(b above)

By Order of the Secretary of the Army:Official:E. C. MEYERGeneral, United States ArmyChief of StaffJ. C. PENNINGTONMajor General, United States ArmyTh

Figure 14.(2)(3)(4)Unsolder and remove the 26 leadsand one lead of capacitor C7901from S7902; tag each lead as it isremoved (fig. 14).Remove the screw

Figure 15. Test Set, Radio TS-1777/VRM-1 front panel chassis, top view.x. Replacement of Resistors Mounted onswitch(1)(2)S7902.Cut the resistor leads

Figure 16. Teat Set, Radio TS-1777/VRM-l frontpanel and chassis. left view.b. Replacement of Test Probe cable(fig. 15 and 19).(1) Insert the probe cab

(a)breaks in the cables near this con-(3) Reassemble the 18-tertinal con-nector. Figure 20 is a cable wiringnector as follows:diagram and exploded vie

Figure 19. Test probe cable, disassembled.Figure 20. Cable Assembly, Specail Purpose,Electrical Branched CX-7899/VRM-l,partially disassembled and sche

Section IV. FINAL ADJUSTMENTS41. GeneralFinal adjustment of the TS-1777/VRM-lmust be performed after major repair,parts replacement, or extensive alig

(3)(4)(5)(6)(7)34Figure 21. Fabrication of special test cables.Use the Transistor Power Supply721A and apply +5 volts dc to thetest probe.Measure the

O volt dc; then slowly increase it.Observe the voltage on the TS-443/U when a sudden drop in thevoltage measured by the ME-26B/U indicates G R E E N i

(8)drop in voltage measured by theME-26B/U indicates that GREENindicator DS7902 has switchedon. The 411A should idicate 220If necessary, readjust R7

Figure 23.Section V. FOURTH ECHELON TESTING PROCEDURES44. GeneralEquipment under test control settingsa. Testing procedures are prepared forcolumns; t

Fig. 2138

46. Physical Tests and Inspection39

Figure 24.40

47. Power Tests41

Figure 25.42

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Figure 26.46

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Changes in force: C 2, C 4, and C 5TM 11-6625-496~5*C 5CHANCEHEADQUARTERSDEPARTMENT OF THE ARMYNo. 5WASHINGTON , D. C., 4 June 1973General Support and

Figure 27.

Figure 27Fig. 2150. 11.5 -Mc Amplifier Tests51

Figure 28.52

Figure 28.fig. 2151. 47.0-Mc Amplifier Test53

52. Summary of Test Datashown below. An “X’ in the Indicator col-Personnel may find it convenient to ar-umn indicates the indicator designated isrange

CHAPTER 3FIFTH ECHELON MAINTENANCESection I. TROUBLESHOOTING AND REPAIR53. GeneralThis chapter includes troubleshootingand repair procedures to be per

near normal operations encoun-tered, faully parts isolation pro-cedure will be specified. The testresults,which are recorded i nvarious test steps, ar

(3)(4)(5)(6)Adjust the TS-382F/U frequency to100 cps while maintaining an ME-30 B/U indication of 50 mv. A nor-mal indication should be +1.5 voltsdc ±

(5)(6)(7)(8)(9)(10)(11)Figure 29. Assembly A7400, parts location..Move the 411A to connector P7501-C and P5701-D. The normal indi-cation should be les

(4)(5)(6)(7)Figure 30. Assembly A 7600, parts locationmaximum indication on theME-26B/U and record the indica-tion.Increase the 606A output to 20 mv

(a) Signal voltage chart.Circuit junctionISignal voltage (rms)P7601-CC7601 and T7601T7601 and C7603Q7601 baseT7602 and C7609R7605 and R7606T7602 and C

(a) Signal voltage chart.Circuit junction Signal Voltage (rms)P7701-M R7703 and c7701Q7701 emitter Q7701 collector 81mv 15.55 mv

(b) Dc voltage chart.Circuit junctionI+dc voltage toground (volts)P7701-DC7710 and R7913Q7702 baseQ7702 emitterR7912 and R7913Q7703 collectorQ7703 ba

e. Voltage Supply Limits Sensing Cir-cuit Test.(1) Perform the alignment procedurefor the voltage supply limitssensing circuit (para 43 c).(2) If the

64Figure 32.. Assembly A 7700, parts location.

Figure 33. Assembly A 7800, parts Location.Section II. FIFTH ECHELON TESTING PROCEDURES60. Purpose of Final TestingThe tests outlined in this sectionm

63. Power TestsCheck the ability of the TS-1777/VRM-lto test power circuits as directed below.a. Preparation.(1) Insert the test probe tip in test jac

ME-30B/U. The RED indicatorshould be lighted.(3) Increase the audio output of the TS-382 F/U to 6.4 volts. The GREENindicator should be lighted.65. Am

Figure 34. Test Set, Radio AN/VRM-1, final tests, block diagram.411A. The RED indicator should be(2)lighted.Increase the rf output of the 606Ato 0.014

APPENDIXREFERENCESThe following is a list of applicable references available to the field and depot mainte-nance repairmen of Test Set Radio AN/VRM-l.

APPENDIX IIGENERAL SUPPORT AND DEPOT MAINTENANCE REPAIRPARTS AND SPECIAL TOOLS LISTSection I.INTRODUCTION1. Scopeat indicated maintenance categories.T

COLOR CODE MARKING FOR MILTARY STANDARD RESISTORSFigure 35. Color code markings for MIL-STD resistors70

INDEXParagraph PageParagraph Page—Adjustments, circuit:Audio------ ------ ------ -----DC------- ------- ------------11.5-mc---------------------5.65-

ParagraphPageConnector J7902 ---—-— ------Connectors -----—-—-——-—-Diodesa--------- -- —-—--— -Front panel-- — --— -—-——-Fuseholder ------——-——-Gasket

By Order of Secretary of the Army:Official:J. C. LAMBERT,Major General, United States Army,The Adjutant General.Distribution:Active Army:DASA (6)USASA

CodeExplanationR—Repair parts and assemblies that are eco-nomically repairable at DSU and GSUactivities and are normally furnishedby supply on an exch

020804

This fine document...Was brought to you by me: Liberated Manuals -- free army and government manualsWhy do I do it? I am tired of sleazy CD-ROM sell

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT. AND DEPOT MAINTENANCE

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT GFNERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)6

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)7

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT GENERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)8

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TM 11-6625-496-45SECTION 11 REPAIR PARTS FOR DIRECT SUPPORT. GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)10

TM 11-6635-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)11

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)12

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)13

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERA SUPPORT, AND DEPOT MAINTENANCE (CONTlNUED)14

TM 11-6625-496-45SECTlON IIREPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORTAND DEPOT MAINTENANCE (CONTINUED)15

Changes in force: C#2 C#4, C#5 and C#6TM 11-6625-496-45C6ChangeNo. 6HEADQUARTERSDEPARTMENT OF THE ARMYWashington, DC, 12 March 1980General Support and

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)16

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)17

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)18

TM 11-6625-496-45SEClTON II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)19

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)20

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT, AND DEPOT MAINTENANCE (CONTINUED)21

TM 11-6625-496-45SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)22

TM 11-6625-496-45 SECTION II REPAIR PARTS FOR DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE (CONTINUED)23

TM 11-6625-496-45SECTION III INDEX-FEDERAL STOCK NUMBER AND REFERENCE NUMBER CROSS REFERENCETO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATIONFEDERALS

TM 11-6625-496-45SECTION III INDEX-FEDERAL STOCK NUMBER AND REFERENCE NUMBER CROSS REFERENCETO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION (CONTIN

tant high current through the base-to-emitter ofQ7802 and R7811 (15 ohms) to ground would causeboth Q7803 and R7811 to fail.Page 8, paragraph 9a: Firs

TM 11-6625-496-45INDEX-FEDERAL STOCK NUMBER AND REFERENCE NUMBER CROSS REFERENCETO FIGURE AND ITEM NUMBER OR REFERENCE DESIGNATION (CONTINUED)26

TM 11-6625-496-4527

TM 11-6625-496-4528

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TM 11-6625-496-4530

TM 11-6625-496-4531

TM 11-6625-496-4532

TM 11-6625-496-4533

TM 11-6625-496-4531

TM 11-6625-496-4535

Figure 9. Tests in selector switch positions A. 2..3, and 7.simplified schematic diagram.3

TM 11-6625-496-4536

TM 11-6625-496-45SECTION IV INDEX-REFERENCE DESIGNATIONCROSS REFERENCE TO PAGE NUMBER (CONTINUED)REFERENCEPAGEDESIGNATIONNUMBERREFERENCEPAGENUMBERRE

M 11-6625-496-45SECTION IV INDEX- REFERENCE DESIGNATIONCROSS REFERENCE TO PAGE NUMBER (CONTINUED)REFERENCEDESIGNATIONPAGENUMBERREFERENCEDESIGNATIONPAG

TM 11-6625-496-45SECTION IV lNDEX- REFERENCE DESIGNATIONCROSS REFERENCE TO PAGE NUMBER (CONTINUED)REFERENCEPAGEDESIGNATIUNNUMBER DESIGNATIONR7715R7716

Figure 40. Test Set, Radio AN/VRM-1, components and running spares.35

Figure 41. Branched power cable, partially disassembled.36

Figure 42. Test set, case removed, three-quarter view from bottom37

Figure 43.Audiofrequency amplifier printed circuit card A7400.38

Figure 44. Teat set, case removed, adjustable components, rear view.39

para 43d.1fig. 11.1Page 14, paragraph 19: In last line, change "475”In some equipment (para 1d(5)(d)), the testedto 402.voltage is connected thro

40Figure 45. 11.5-MHz amplifier printed circuit card A7600.

Figure 46. Case, test set removed, gaaket and bumpers (AN/VRM-1). 41

Figure 47. Test Set, Radio AN/VRM-1A, case cover and instruction plates.Figure 48.Case, test set removed, gasket and (AN/VRM-1A)42

Figure 49. Test Set, Radio AN/VRM-1, cover components.43

Figure 50. Cover assembly (AN/VRM-1A).Figure 51.Ted set, case removed, three-quarter view from top.44

Figure 52. Band pass filter printed circuit card A7500.45

Figure 53. Test probe assembly.46

TEST SET SUB-ASSEMBLY(CAPACITOR- RESISTOR ASSEMBLY)SECTION A-AEL6625-496-40P-TM-15Figure 54.Test set, front panel and chassis, chassis bottom plate re

Figure 55. Test set, front panel and chassis, bottom view.48

Figure 56.Test set, front panel and chassis, left view.49

Page 22,chart:paragraph34b. Add the following to theContact No. S7902Aand S7902B2.1919.ResistorR7902 and R7923X7919R7919 and R7922.Two resistors provi

Figure 57. Test probe, radiofrequency preamplifier.50

Figure 58. Teat set, front panel and chassis, top view.51

Figure 59. Lamp driving gates printed circuit card 7800.52

Figure 60. Radiofrequency amplifier printed circuit card A 7700.53

By Order of the Secretary of the Army:Official:VERNE L. BOWERSMajor General, United States ArmyThe Adjutant GeneralCREIGHTON W. ABRAMSGeneral, United

Changes in force:C 2, C 3, and C 4TM 11-6625-496-45C4CHANGEHEADQUARTERSDEPARTMENT OF THE ARMYWASHINGTON , D.C. 9 July 1970No. 4GS and Depot Mainte

NOTENew plates should be requisitioned forthose tat sets that do not have platesdescribed in (4) aboveParagraph 2 f, line 9. Change “22 volts” to:21.

Figure 11.3

Figure 11.1Add figure 11.1 after figure 11.4

Page 24, paragraph 36. Add the following asthe introductory paragraph:The front panel and chassis of the TS-1777/VRM- 1 (AN/VRM-l) and TS-1777A/VRM-l

Figure 11.2.6

Figure 23.1. TS-1777A/VRM-1 (and later production units of TS-1777/VRM-1),bottom view and location of adjustable controls.Paragraph 44. Add subpagraph

changes in the “Performance Standard" column.+19.00 and +21.80.In step 2b, change “+14.2” to: betweenIn step 4b, change+13.40 and +15.00.+9.90 an

Selector switchS7902 positionTypeA2345678910111213141516171819Signal at probe tipNote 1)Note 2)dcdcdcdcdcafaf (Note 3)afaf (Note 3)afaf (Notc3)afaf (N

Page 55, paragraph 54b (3), chart Add the fol-wing item to the chart:Test equipmentTechnical manualmultmeter, ElectronicAN/URM-146 . . . . . TM 11-66

Subparagraph h(2), line 5. Change “ME30B/U to: AN/URM-145.Page 63, figure 31. In figure 31, change callout“Q7606-C” to: Q7602-C.Page 65 (page 2 of

By Order of the Secretary of the ArmyOfficial:KENNETH G. WICKHAM,Major General, United States ArmyThe Adjutant GeneralW.C. WESTMORELAND,General, Unit

Distribution:To be distributed in accordance with DA Form 12-51 Direct/General Support maintenanceliterature for AN/VRC-12, AN/VRC-43, AN/VRC-44, AN/V

*C 2 Field (Fourth Echoion)TEST SET,CHANGENo. 2TM 11-6625-496-45and Depot Maintenance ManualRADIO AN/VRM-1HEADQUARTERSDEPARTMENT OF THE ARMYWASHINGTO

NOTES:1. IN SOME SETS L7302 HAS BEEN REMOVED ANDR7204 AND C7304 HAVE BEEN WIRED IN AS SHOWN.2. IN SOME SETS C7304, R7304, AND THE .1 Of CAPACITORARE C

b. Additional Equipment.b. Modification Work Orders.Perform all-.. .modification work orders (MWO) per-applicabletaining toSpecified.MWO’s.62. Testth

Page 27, paragraph 38. Make the followingchanges:Subparagraph p. The following note is added:NOTEIf diode CR7901 is type 1N645 (NSN 5961-00-577-6084)

Figure 34.1. (Added) Special junction box.f. Connect the dc leads of the ME-26A/U toh. Insert the TS-1777/VRM-l test probe tipterminals A (ground) and

Figure 34.2. (Added) Special test cable.USM-98 across the probe tip and the probe groundconnector.d. Carefully increase the output from the PP3514/U a

TM6625-496-45-C2-3Figure 34.3. (Added) Input test setup, block diagram.g. Carefully increase the output from the PP3514/U and note the voltage indicat

put of the TS-421/U until the RED indicatorlights.e. Turn the selector switch to 6,f. Carefully increase the output from the TS-421/U and note the vol

a. Carefully increase the output from the AN/GRM-50and note voltage indicated on theAN/URM-145 when the RED indicator goes outand the GREEN indicator

Figure 34.69

Caution: check to be sure that signal voltagesare removed from the brfore setting theTS-1777/VRM-1 ON-OFF switch to OFF.e. Remove all test connections