TM 11-5820-489
TM 11-5820-489-34
TO 31R4-2GRA6-42
TECHNICAL MANUAL
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE MANUAL
CONTROL GROUP
AN/GRA-6
(NSN 5820-00-644-4554)
This publication is required for official use or for
administrative or operational purposes only. Distribution is
limited to US Government Agencies. Other requests far this
document must be referred to Commander, US Army
Communicotlons.Electronics Command and Fort Monmouth,
ATTN: AMSEL-ME-P, Fort Monmouth, NJ 07703-5000.
DEPARTMENTS OF THE ARMY AND THE AIR FORCE
1
J A N U A R Y
1 9 8 7
TM 11-5820-489-34/T0 31R4-2GRA6-42
Adequate ventilation should be provided while using TRICHLOROTRIFLUOROETHANE. Prolonged breathing of vapor should be avoided.
The solvent should not be used near heat or open flame, the products of
decomposition are toxic and irritating. Since TRICHLOROTRIFLUOROETHANE dissolves natural oils, prolonged contact with the skin
should be avoided. When necessary, use gloves which the solvent cannot
penetrate. If the solvent is taken internally, consult a physician
immediately.
Compressed air shall not be used for cleaning purposes except where
reduced to less than 29 pounds per square inch (psi) and then only with
effective chip guarding and personnel protective equipment. Do not use
compressed air to dry parts when TRICHLOROTRIFLUOROETHANE has
been used. Compressed air is dangerous and can cause serious bodily
harm if protective means or methods are not observed to prevent chip or
particle (of whatever size) from being blown into the eyes or unbroken
skin of the operator or other personnel.
A
TM 11-5820-489-34/TO 31R4-2GRA6-42
SAFETY STEPS TO FOLLOW IF SOMEONE
IS THE VICTIM OF ELECTRICAL SHOCK
DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL
IF POSSIBLE , TURN OFF THE ELECTRICAL POWER
IF YOU CANNOT TURN OFF THE ELECTRICAL
POWER, PULL, PUSH, OR LIFT THE PERSON TO
SAFETY USING A WOODEN POLE OR A ROPE OR
SOME OTHER INSULATING MATERIAL
SEND FOR HELP AS SOON AS POSSIBLE
AFTER THE INJURED PERSON IS FREE OF
CONTACT WITH THE SOURCE OF ELECTRICAL
SHOCK, MOVE THE PERSON A SHORT DISTANCE
AWAY AND IMMEDIATELY START ARTIFICIAL
RESUSCITATION
B
*TM 11-5820-489-34
TO 31R4-2GRA6-42
Technical Manual
No. 11-5820-489-34
Technical Order
No. 31R4-2GRA6-42
DEPARTMENTS OF THE ARMY,
AND THE AIR FORCE
Washington, DC, 1 January 1987
DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
CONTROL GROUP AN/GRA-6
(NSN 5820-00-644-4554)
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes or if you know of a way to improve the
procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form 2028-2 located in back of this manual direct to: Commander, US
Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-MP, Fort
Monmouth, New Jersey 07703 -5000. For Air Force, submit AFTO Form 22 (Technical Order System
Publication Improvement Report and Reply) in accordance with paragraph 6-5, Section Vl, T.O. 00-5-1.
Forward direct to prime ALC/MST. A reply will be furnished direct to you.
TABLE OF CONTENTS
PAGE
CHAPTER 1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Section I
Section II
Section Ill
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Equipment Description and Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Technical Principles of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
CHAPTER 2
DIRECT SUPPORT MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Section I
Section II
Section Ill
Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . 2-1
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Maintenance
Instructions. . . . . . . . . . . . . . . . . . . . . . 2-48
CHAPTER 3
GENERAL SUPPORT MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Section I
Section II
Section Ill
Repair Parts, Special Tools, TM DE, and Support Equipment. . . . . . . . . . . . . 3-1
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Testing Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-2
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
APPENDIX A
APPENDIX B
EXPENDABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . B-1
INDEX
Index 1
FOLDOUT (Located at end of manual)
*This manual supersedes TM 11-5038 dated April 1951.
i/(ii blank)
TM 11-5820-489-34/T0 31R4-2GRA6-42
CHAPTER 1
INTRODUCTION
Page
Consolidated Index of Army Publications
and Blank Forms . . . . . . . . . . . . . . . . . . . .
Destruction of Army Electronics
Materiel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Configuration . . . . . . . . . . . . . . .
Location and Description of
Major Components . . . . . . . . . . . . . . . . . .
Maintenance Forms, Records, and
Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-1
1-1
1-1
1-1
Page
Nomenclature Cross-Reference List . . . . 1-3
Official Nomenclature, Names,
and Designations . . . . . . . . . . . . . . . . . . . 1-1
Reporting Equipment Improvement
Recommendations (EIR) . . . . . . . . . . . . . 1-1
Safety, Care, and Handling . . . . . . . . . . . . . 1-1
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Tabulated Data . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Technical Principles of Operation . . . . . . 1-3
Section l. GENERAL INFORMATION
1-1. SCOPE
This manual describes Control Group AN/GRA-6 and covers Direct and General Support
maintenance.
1-2. CONSOLIDATED INDEX OF ARMY PUBLICATIONS AND BLANK FORMS
Refer to the latest issue of DA Pam 310-1 to determine whether there are new editions,
changes or additional publications pertaining to the equipment.
1-3. MAINTENANCE FORMS, RECORDS, AND REPORTS
a. Reports of Maintenance and Unsatisfactory Equipment. Department of the Army forms and
procedures used for equipment maintenance will be those prescribed by DA Pam 738-750
Maintenance Management Update. Air Force personnel will use AFR 66-1 for maintenance
reporting and TO-00-35D54 for unsatisfactory equipment reporting.
b. Report of Packaging and Handling Deficiencies. Fill out and forward SF 364 (Report of Discrepancy
(ROD)) as prescribed in AR 735-11-2/DLAR 4140.55/NAVMATlNST 4355.73B/AFR 400-54/MCO 4430.3H.
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/NAVSUPlNST 4610.33C/AFR
75-18/MCO P4610.19D/DLAR 4500.15.
1-4. DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM
750-244-2.
1-5. OFFICIAL NOMENCLATURE, NAMES, AND DESIGNATIONS
Refer to TM 11-5820-489-10.
1-6. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
a. If your equipment needs improvement, let us know. Send us an EIR. You, the user, are the only one
who can tell us what you don’t like the design. Put it on an SF 368 (Quality Deficiency Report). Mail it to
Commander, US Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-PAMA-D, Fort Monmouth, New Jersey 07703-5000. We’ll send you a reply.
b. Air Force personnel are encouraged to submit ElR’s in accordance with AFR 900-4.
Section II EQUIPMENT DESCRIPTION AND DATA
1-7. TABULATED DATA
Refer to TM 11-5820-489-10.
1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
Refer to TM 11-5820-489-10.
1-9. EQUIPMENT CONFIGURATION
Refer to TM 11-5820-489-10.
1-10. SAFETY, CARE, AND HANDLING
Observe all WARNINGS, CAUTIONS and NOTES contained in this manual.
1-1
TM 11-5820-489-34/TO 31R4-2GRA6-42
1-2
TM 11-5820-489-34/T0 31R4-2GRA6-42
1-11.
NOMENCLATURE CROSS-REFERENCE LIST
REMOTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-433/GRC
LOCAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-434/GRC
HS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .Handset H-33(*)/PT
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
1 - 1 2 . FU N C TION A L A N A LYS IS
a. Control Group AN/GRA-6 provides:
● Talking and listening capabilities for one or two receiver-transmitters to a remote
position.
● Telephone communications and ringing between remote and local control positions.
● Power control of radio set from remote position.
b. Control Group AN/GRA-6 consists of these basic circuit elements:
● Telephone circuit
● Ringing circuit
● Control circuit
●
●
●
Each control unit provides a line transformer (T1) with a microphone input, receiver output and balanced 600-ohm line windings.
Both transformers (T1) joined by telephone line form the basic telephone circuit.
Microphone voltage is provided by flashlight dry cells (BA-30; two in Remote Control Unit and
two in Local Control Unit) connected in series with the microphone windings of the line
transformer.
1-3
TM 11-5820-489-34/T0 31R4-2GRA6-42
The ringing circuit consists of:
● Hand cranked 90 volts/20 Hz ringing generator/signal transmitting device.
● Bell and lamp/signal receiving devices.
● Signal switch to select audible or visual signal.
Ringing, sending and receiving devices are connected across the telephone line.
Control Circuits
Remote Control
C-433/GRC
Remote Control Circuit consists of:
● Control Voltage
● Selector Switch/three position which provides three functions:
LEFT-HAND WRITE-IN POSITION - battery connected across line/binding post L1 positive/L2
negative.
MIDDLE WRITE-IN POSITION - battery connected across line/binding post L1 negative/L2 positive.
TEL - battery disconnected from line.
1-4
TM 11-5820-489-34/TO 31R4-2GRA6-42
Local Control
C-434/GRC
Local Control circuit consists of:
● Four position Remote Switch.
● Three position Local Switch.
● Three relays 01, 02, and 03.
REMOTE SWITCH (SET 1, SET 2, or SET 1 and SET 2) connects relays 01, 02 and 03
across the line to respond to the particular control voltage polarity determined by the
setting of the Remote Control SELECTOR switch. In the TEL ONLY position, the switch
removes control of radio from remote operator and allows the local operator control.
LOCAL SWITCH - with Remote Switch (Local Control Unit) in TEL ONLY position, control of
SET 1 or SET 2 is available to local operator.
Relays 01, 02, 03
01- Nonpolarized, nonlocking type; controls switching of microphone and headphone leads,
02- Polarized, with magnetic latch; controls switching ground return connection to receivertransmitter control relays.
03- Polarized, with magnetic latch; controls switching power supply energizing lead for the radio
set. (Refer to FO-7.)
1-5/(1-6 blank)
TM 11-5820-489-34/TO 31R4-2GRA6-42
CHAPTER 2
DIRECT SUPPORT MAINTENANCE
PAGE
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... . . .. 2-52
Continuity and Voltage Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31, 2-33
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48
instructions, Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Operational Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22, 2-24
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76
Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Replacement of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53
Resistance Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35, 2-38, 2-43, 2-45
Short Circuit Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15, 2-17, 2-21
Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27, 2-30
Section l. REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
2-1. SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
NOMENCLATURE
NATIONAL STOCK NO.
REMARKS
Battery, BA-30
6135-00-120-1020
4 Required
Battery, BA-414/U
6135-00-125-5256
1 Required
2 Required
Handset, H-33/PT
5965-00-163-9947
Multimeter, TS-352B/U
6625-00-242-5023
Tool Kit, Electronic Equipment TK-105/G
5180-00-610-8177
Voltmeter, Electronic ME-30B/U
6625-00-649-4537
2-2. REPAIR PARTS
Refer to TM 11-5820-489-34P.
2-1
TM 11-5820-489-34/T0 31R4-2GRA6-42
Section Il. TROUBLESHOOTING PROCEDURES
2-3. GENERAL INSTRUCTIONS
a. Maintenance personnel should conduct a visual inspection of the equipment before starting detailed troubleshooting steps. Many troubles can be discovered by looking over the equipment and noting an obviously damaged, dirty or corroded part, or defective wiring.
b. Maintenance personnel at the Direct Support level should take advantage of steps made
at lower levels by:
● debriefing operator who discovered fault if possible or applicable.
● debriefing organizational personnel who attempted repair prior to receipt of equipment
at the Direct Support facility.
.
c. The following troubleshooting chart can be used only if both components of Control
Group AN/GRA-6 are available and installed properly. For installation procedures see TM
11-5820-489-20. If only one component of Control Group AN/GRA-6 is available at the direct support maintenance level proceed to the localized testing procedure starting in para. 2-4 and do
short circuit checks, operational checks, voltage and resistance measurements to isolate faulty
components.
d. Batteries must be installed If no other power source is provided.
2-2
TM 11-5820-489-34/TO 31R4-2GRA6-47
Using the Troubleshooting Chart
NOTE
To remove unit from case,
refer to paragraph 2-17.
1
Going from MALFUNCTION/SYMPTOM column to PROBABLE CAUSE column will zero in
on the problem area.
2
WARNINGS, CAUTIONS and NOTES appear when applicable.
3
Flows logicaily, taking technician from most probable to least likely cause of malfunction.
4
Illustrated aids speed procedure and increase accuracy.
2-3
TM 11-5820-489-34/T0 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
(1) REMOTE does not transmit
visual signal.
PROBABLE CAUSE
INDICATION
YES
NO
LOCAL - Lamp (E3), Resistor (R1), Signal
Selector Switch (S1) defective.
REMOTE - Transformer (T1) or Generator (G1)
defective.
Preliminary
REMOTE - Set SELECTOR to TEL.
LOCAL - Set REMOTE switch to TEL ONLY, LOCAL switch to TEL, SIGNAL SELECTOR switch S1
to LAMP.
1. Crank REMOTE ringing generator.
Ringing signal
at HS of
REMOTE.
Go to 2.
G1, T1 of
REMOTE
defective.
(Refer to
para 2-7.)
2. Crank REMOTE ringing generator.
LAMP (E3)
lights at
LOCAL.
..............
Change LAMP
E3. (Refer to
para 2-19.)
Repeat step 2
If NO, check
S1, R1. (Refer
to para 2-13.)
(2) LOCAL does not transmit visual
signal.
REMOTE - Lamp (E3) Resistor (R1), Signal
Selector Switch (S1), Transformer (T1)
defective.
LOCAL - Transformer (T1) or Generator (G1)
defective.
Preliminary
REMOTE - Set SELECTOR to TEL, SIGNAL SELECTOR switch (S1) to LAMP.
LOCAL - Set REMOTE switch to TEL ONLY, LOCAL switch to TEL, Switch S1 to BELL.
1. Crank LOCAL ringing generator.
2-4
Ringing signal
at HS of
LOCAL.
Go to 2.
G1, T1 of
LOCAL defective.
(Refer to
para 2-8.)
TM 11-5820-489-34/TO 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
PROBABLE CAUSE
TEST PROCEDURE
2. Crank LOCAL ringing generator.
(3) REMOTE does not transmit
audible signal.
INDICATION
NO
YES
Change call
light (E3).
(Refer to
para 2-19.)
Repeat step 2
If NO, check
S1, R1. (Refer
to para 2-14.)
Call light (E3)
lights at
REMOTE.
LOCAL - Bell, Signal Selector Switch (S1),
Capacitor (C1) or Transformer (T1) defective.
REMOTE - Transformer (T1) or Generator (G1)
defective.
Preliminary
REMOTE - Set SELECTOR to TEL, switch S1 to BELL.
LOCAL - Set REMOTE switch to TEL ONLY, LOCAL switch to TEL and switch S1 to BELL.
1. Crank REMOTE ringing generator.
Ringing signal
at HS of
REMOTE.
Go to 2.
2. Crank REMOTE ringing generator.
Bell rings at
LOCAL.
Go to 3.
3. Crank REMOTE ringing generator.
Ringing signal
at HS of
LOCAL.
Go to (4).
(4) LOCAL does not transmit audible
signal.
T1, G1 of
REMOTE defective.
(Refer to
para 2-7.)
Bell, C1,
S1 in
LOCAL defective.
(Refer to
para 2-8.)
T1 of
LOCAL defective.
(Refer to
para 2-14.)
LOCAL - G1 or T1 defective.
REMOTE - Bell, S1, C1 or T1 defective.
Preliminary
REMOTE - Set SELECTOR to TEL, switch S1 to BELL.
2-5
TM 11-5820-489-34/T0 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
PROBABLE CAUSE
INDICATION
NO
YES
LOCAL - Set REMOTE switch to TEL ONLY, LOCAL switch to TEL and switch S1 to BELL.
1. Crank LOCAL ringing generator.
Ringing signal
at HS of
LOCAL.
Go to 2.
2. Crank LOCAL ringing generator.
Bell rings at
REMOTE.
Go to 3.
3. Crank LOCAL ringing generator.
Ringing signal
at HS of
REMOTE.
(5) LOCAL does not transmit speech.
REMOTE does not transmit speech.
. . . . . .
T1, G1 of
LOCAL defective.
(Refer to
para 2-8.)
Bell, C1
S1 in REMOTE defective.
(Refer to
para 2-7.)
T1 of
REMOTE defective.
(Refer to
para 2-8.)
LOCAL - Transformer (T1), Capacitor (C1),
Batteries BT1 and BT2 defective.
REMOTE - Transformer (T1), Capacitor (C1),
Batteries BT1 and BT2 defective.
1. At LOCAL, press push-to-talk switch and
talk into microphone.
Speech heard
at HS of
REMOTE.
Go to 4.
LOCALBT1/BT2 improperly
installed
or defective.
Check installation
or install
new BT1,
BT2 if defective.
Go to 2.
2-6
TM 11-5820-489-34/T0 31R4-2GRA6-42
PROBABLE CAUSE
MALFUNCTION/SYMPTOM
TEST PROCEDURE
INDICATION
YES
NO
2 . At LOCAL, press push-to-talk switch and
talk into microphone.
Speech heard
at HS of
REMOTE.
Go to 4.
T1 or C1
defective
in LOCAL
or REMOTE.
To check
go to 3.
3 . At LOCAL, connect a headphone
equipped with wire connectors to L1 and
L2. Press push-to-talk switch on HS and
talk into microphone.
Speech heard
at headphone
connected to
L1 and L2 of
LOCAL.
4 . At REMOTE, press push-to-talk switch on
HS and talk into microphone.
Speech heard
at HS of
LOCAL.
T1 or C1
in REMOTE
defective.
Make voltage and
continuity
checks of
above.
(Refer to
para 2-9.)
Go to (6).
T1 or C1
in LOCAL
defective.
Make voltage and
continuity
checks of
above.
(Refer to
para 2-10.)
REMOTE
BT1/BT2
improperly
installed
or defective.
Check installation
or install
new BT1/
BT2 if defective.
Go to 5.
5 . At REMOTE, press push-to-talk switch of
HS and talk into microphone.
Speech heard
at HS of
LOCAL.
Go to (6).
T1 or C1
in LOCAL
or REMOTE
defective.
To check
go to 6.
2-7
TM 11-5820-489-34/T0 31R4-2GRA6-42
PROBABLE CAUSE
MALFUNCTION/SYMPTOM
TEST PROCEDURE
INDICATION
(6) LOCAL does not control SET 1.
YES
NO
DEFECTIVE: S2, S3, Relay Control Wiring,
SET 1 LOCAL Microphone Circuit or
LOCAL Phone Circuit to SET 1.
Preliminary
REMOTE - Set SELECTOR switch to TEL position.
LOCAL - Set REMOTE switch to SET 1 and hold LOCAL switch to SET 1
Before making continuity checks, remove voltages
from points being measured.
NOTE
Use Multimeter TS-352B/U for measurements.
1. At LOCAL, measure continuity: Between
M of J2 and chassis.
2. Between C of J2 and chassis.
2-8
Zero ohms
Zero ohms
Go to 2.
S2 or power
control
wiring defective.
Check continuity of
above.
Go to 3.
S3 or relay
control
circuit
wiring for
SET 1 defective.
Check continuity of
above.
TM 11-5820-489-34/TO 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
PROBABLE CAUSE
INDICATION
YES
NO
3. Between T of J2 and C of J1.
Zero ohms
Go to 4.
S2 or S3 or
SET 1 LOCAL
microphone
circuit defective. (Refer to
para 2-14 to
check S2 and
S3 continuity
(Refer to
FO-7, FO-8
microphone
circuit.)
4. Between b of J2 and A or L of J1.
Infinity
Go to (7).
LOCAL phone
circuit to
SET 1 defective.
Check S2
and LOCAL
phone circuit continuity.
(Refer to
para 2-14
and FO-7.)
(7) LOCAL does not control SET 2.
DEFECTIVE: S2, S3 Relay Control Wiring
for SET 2, LOCAL Microphone Circuit or
LOCAL Phone Circuit to SET 2.
Preliminary
REMOTE - Set SELECTOR switch to TEL.
LOCAL - Set REMOTE switch to SET 1 and LOCAL switch to SET 2.
2-9
TM 11-5820-489-34/T0 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
1. At LOCAL, measure continuity between
N of J2 and chassis.
PROBABLE CAUSE
INDICATION
Zero ohms
YES
Go to 2.
NO
S3 or relay
control
circuit
wiring for
SET 2.
Check S3
continuity.
(Refer to
FO-7.)
Check control circuit
wiring.
(Refer to
FO-7.)
2. At LOCAL, measure continuity between
pin a of J2 and C of J1.
Zero ohms . . . . . . . .
S2, S3 or
wiring defective.
Check S2 and
S3 continuity. (Refer to
FO-7.)
Check local
microphone
circuit to
SET 2. (Refer
to FO-7.)
2-10
TM 11-5820-489-34/T0 31R4-2GRA6-42
PROBABLE CAUSE
MALFUNCTION/SYMPTOM
TEST PROCEDURE
8) REMOTE does not control SET 1.
YES
INDICATION
NO
DEFECTIVE: Battery (BT3), S2, Line Wires too
long or reversed, Microphone circuit to
SET 1, Relay circuit, 01, 02, or 03 Relay.
Preliminary
REMOTE - Put SELECTOR switch in LH write-in position.
LOCAL - Put REMOTE switch in SET 1 and LOCAL switch in TEL position.
1. At REMOTE, press push-to-talk switch.
Talk into microphone. Measure voltage
between binding posts L1 and L2 of
REMOTE.
At least
24 volts;
L1 positive, L2
negative.
Go to 2.
BT3, S2 or
control
voltage circuit
defective.
Replace BT3.
(Refer to
para 2-19.)
Check control
circuit continuity. (Refer
to FO-6, FO-7.)
2. At REMOTE, press push-to-talk switch.
Talk into microphone. Measure voltage
between binding posts L1 and L2 at
LOCAL.
At least
24 volts;
L1 positive, L2
negative.
Go to 3.
Line wires
too long or
reversed.
Reverse line
connections.
3. At REMOTE, press push-to-talk switch
and talk into microphone. At LOCAL,
measure resistance between C of J2 and
chassis.
Infinity
Go to 4.
02 relay or SET
1 relay control circuit
defective.
Check continuity of
above.
(Refer to FO-6,
FO-7.)
4. At REMOTE, press push-to-talk switch
and talk into microphone. At LOCAL,
measure resistance between N of J2 and
chassis.
Infinity
Go to 5.
02 relay or
SET 2 relay
control circuit
defective.
2-11
TM 11-5820-489-34/T0 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
PROBABLE CAUSE
INDICATION
4. At REMOTE (cont.)
Check continuity of
above.
(Refer to FO-6,
FO-7.)
Go to 6.
5. At REMOTE, press push-to-talk switch
and talk into microphone. At LOCAL,
measure resistance between M of J2
and chassis.
Zero ohms
6. At REMOTE, release push-to-talk switch.
At LOCAL, measure the resistance
between M of J2 and chassis.
Zero ohms
Go to 7.
7. At REMOTE, set SELECTOR switch to
RH write-in position. Press then release
push-to-talk switch. At LOCAL, measure
the resistance between M of J2 and
chassis.
Zero ohms
Go to (9).
(9) REMOTE does not control SET 2.
NO
YES
03 relay or S2
defective.
Check continuity of 03
relay and S2.
(Refer to FO-6,
FO-7.)
03 relay defective. Replace
03 relay.
(Refer to
para 2-19.)
03 relay
defective.
Check 03 relay
continuity.
(Refer to
FO-7.)
DEFECTIVE: S2, Line Wires too long or
reversed, Control Voltage Circuit,
Microphone Circuit to SET 1 or 2, 01, 02,
or 03 Relay or Microphone Push-toTalk Switch.
Preliminary
REMOTE - Put SELECTOR switch in MIDDLE Write-in position.
LOCAL - Put REMOTE switch in SET 1 position and hold LOCAL switch in SET 1 position.
1. At REMOTE, press push-to-talk switch.
Talk into microphone. At REMOTE,
measure voltage between L1 and L2.
2-12
At least
24 volts;
L1 positive, L2
negative.
Go to 2.
BT3, S2 defective or
control circuit. Check
continuity.
(Refer to FO-6,
FO-7.)
TM 11-5820-489-34/TO 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
PROBABLE CAUSE
INDICATION
YES
NO
2. At REMOTE, press push-to-talk switch.
Talk into microphone. At LOCAL,
measure voltage between L1 and L2.
At least
24 volts;
L1 negative, L2
positive.
Go to 3.
Line wires
too long or
reversed.
Reverse line
connections.
3. At REMOTE, press push-to-talk switch,
Talk into microphone. At LOCAL,
measure resistance between C of J2
and chassis.
Infinity
Go to 4.
02 relay or
SET 1 relay
control circuit
defective.
Check continuity of
above (Refer
to FO-7.)
Zero ohms
Go to 5.
SET 2 relay
control circuit
defective.
4. At REMOTE, press push-to-talk switch.
Talk into microphone. At LOCAL,
measure resistance between N of J2 and
chassis.
Check continuity of S2,
02 relay and
SET 2 relay
control circuit
(Refer to
FO-7.)
5. At REMOTE, release push-to-talk switch.
At LOCAL, measure resistance between
C and J2 and chassis.
Infinity
Go to 6.
Microphone
Push-to-talk
switch or 02
relay,
defective.
Check continuity of
above.
(Refer to
FO-8.)
2-13
TM 11-5820-489-34/TO 31R4-2GRA6-42
MALFUNCTION/SYMPTOM
TEST PROCEDURE
2-14
PROBABLE CAUSE
INDICATION
YES
NO
Go to 7.
01 relay
defective
6. At REMOTE, release push-to-talk switch.
At LOCAL, measure resistance between
A of J1 chassis.
Infinity
7. At LOCAL, put REMOTE switch in SET 2
position. At REMOTE, put SELECTOR
switch in LH Write-in position. At
REMOTE, press push-to-talk switch. Talk
into microphone. At LOCAL, measure
resistance between M of J2 and chassis.
Zero ohms
8. At REMOTE, release push-to-talk switch.
At LOCAL, measure resistance between
M of J2 and chassis.
Zero ohms
Go to 9.
9. At REMOTE, put SELECTOR switch in
MIDDLE Write-in position. Push, then
release push-to-talk switch. At LOCAL,
measure resistance between M of J2
and chassis.
Infinity
. . . . .
Check 01 relay
continuity
(Refer to
FO-7.)
Go to 8.
03 relay or S2
defective
Check 03 relay
and S2
continuity.
(Refer to FO-6,
FO-7 and FO-8.)
03 relay defective Replace
03 relay.
(Refer to
para 2-19.)
03 relay defeclive Check
03 relay
continuity
(Refer to FO-6,
FO-7 and FO-8.
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-4. SHORT CIRCUIT CHECKS - REMOTE CONTROL UNIT
Before proceeding to isolate faults within any component, key circuits should be check for
shorts.
Preliminary Test Setup
●
●
●
●
Remove outer case cover releasing two snap catches (refer to para 2-17).
Remove dry cell batteries (refer to para 2-17).
Disconnect AUDIO accessories.
Use Multimeter TS-352B/U.
CAUTION
Do not install batteries in this unit until any faults found
in the following tests have been repaired.
NOTE
If an incorrect reading is obtained during initial short
circuit checks, visually check wires, lugs, and parts involved and repair as needed, before proceeding to
troubleshooting procedures.
2-15
TM 11-5820-489-34/TO 31R4-2GRA6-42
Test Setup for Remote Control Unit
● Use the following illustrations to locate test points.
FROM
2-16
TO
REQUIRED READING
Terminal C of AUDIO connector J1.
Chassis
Infinity
Terminal E of AUDIO connector J1.
Chassis
Infinity
Terminal F of AUDIO connector J1.
Chassis
Infinity
Binding post L1 for each of the positions of
S1 (Signal Selector) switch and S2 (SELECTOR) switch
Chassis
Infinity
Terminal H of AUDIO connector J1 for each of
the positions of S2 (SELECTOR) switch.
Chassis
Infinity
Binding post L2 for each of the positions of
S1 (Signal Selector) switch and S2 (SELECTOR) switch.
Chassis
Infinity
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-5. SHORT CIRCUIT CHECKS - LOCAL CONTROL UNIT
Before proceeding to isolate faults within any component, key circuits should be checked for
shorts.
Preliminary Test Setup
●
●
●
●
Remove outer case cover releasing two snap catches (refer to para 2-17).
Remove dry cell batteries (refer to para 2-17).
Disconnect AUDIO accessories.
Use Multimeter TS-352B/U.
CAUTION
Do not install batteries in this unit until any faults found
in the following tests have been repaired.
NOTE
If an incorrect reading is obtained during initial short
circuit checks, visually check wires, lugs, and parts involved and repair as needed, before proceeding to
troubleshooting procedures.
2-17
TM 11-5820-489-34/TO 31R4-2GRA6-42
Test Setup for Local Control Unit
● Use the following illustrations to locate test points.
2-18
FROM
TO
Binding post L1 for each position of REMOTE
switch S2.
Chassis
Infinity
Binding post L2 for each position of REMOTE
switch S2.
Chassis
Infinity
Terminal C of AUDIO connector J1 for each
position of LOCAL switch S3.
Chassis
Infinity
REQUIRED READING
TM 11-5820-489-34/T0 31R4-2GRA6-42
NOTE
Hold both plugs in hand and check.
FROM
TO
REQUIRED READING
Terminal C of Connector Plug P2 for each
position of REMOTE switch S2 and LOCAL
switch S3.
Chassis
infinity
Terminal T of connector J2 for each position
of REMOTE switch S2 and LOCAL switch S3.
Chassis
Infinity
Terminal F of connector plug P2 with LOCAL
switch S3 in TEL or SET 1.
Chassis
Infinity
LOCAL switch S3 in SET 2.
Chassis
Zero
Terminal F of connector plug P1 with LOCAL
switch S3 in TEL or SET 2.
Chassis
Infinity
LOCAL switch S3 in SET 1.
Chassis
Zero
Terminal M of connector J2 with REMOTE
switch S2 in TEL ONLY.
Chassis
Infinity
REMOTE switch S2 in SET 1 & 2.
Chassis
Zero
REMOTE switch S2 in SET 1 or SET 2.
Chassis
Zero or Infinity depending on the last voltage
applied to line terminals.
2-19
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-20
FROM
TO
REQUIRED READING
Terminal B of J1
Chassis
Zero
Terminal E of J1
Chassis
Zero
Terminal H of J1
Chassis
Zero
Terminal B of P2
Chassis
Zero
Terminal B of P1
Chassis
Zero
Terminal d of J2
Chassis
Zero
Terminal b of J2
Chassis
Zero
Terminal A of J1
Terminal L of J1
Zero
Terminal C of P2
Terminal a of J2
Zero
Terminal A of P2
Terminal A of P1
Zero
Terminal J of P2
Terminal J of P1
Zero
Terminal F of P2
Terminal N of J2
Zero
Terminal A of P1
Terminal S of J2
Zero
Terminal J of P1
Terminal M of J2
Zero
Terminal C of P1
Terminal T of J2
Zero
Terminal F of P1
Terminal C of J2
Zero
TM 11-5820-489-34/T0 31R4-2GRA-6-42
2-6. SHORT CIRCUIT CHECKS - INTERCONNECTING BOX J-654/G
● Disconnect plug connector U-77/U from REMOTE CONTROL UNIT AUDIO connector.
● Remove HS and LOUDSPEAKER from receptacle connectors U-79/U.
● Use Multimeter TS-352B/U.
● Use the following illustrations to locate test points.
● Measure continuity between letters of the same designation on receptacle connectors
U-79/U and plug connector U-77/U. Reading should be zero.
● Measure continuity between pin A of connector U-77/U and all other pins. Reading
should be infinity.
● Pins J, K, and L are not connected.
2-21
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-7. OPERATIONAL CHECKS FOR REMOTE CONTROL UNIT
It is necessary to use a HS known to be in good operating condition to properly counduct the
following operational checks. Refer to TM 11-5820-489-20.
Test Setup
●
●
●
●
●
●
2-22
Remove outer case cover by loosening two thumbscrews (refer to para 2-17).
Install batteries (refer to para 2-20).
Connect good HS to AUDIO connector.
Set SELECTOR switch to TEL position.
Set SIGNAL SELECTOR switch to BELL position.
Use the following illustrations to locate test points.
TM 11-5820-489-34/TO 31R4-2GRA6-42
OPERATIONAL CHECKS
TEST PROCEDURE
INDICATION
YES
NO
(1) RINGING CHECKS
1. Crank generator handle.
Bell does
not ring.
Go to 2.
2. Connect a jumper between binding post
L1 and terminal #2 of Signal Selector
switch and crank generator handle.
Lamp lights
Go to 3.
Replace
Generator.
(Refer to
para 2-19.)
Replace
Lamp. (Refer
to para 2-19.)
Repeat step 2.
If NO, remove
jumper and
check
resistance of
transformer or
capacitor.
(Refer to
para 2-15.)
3. Move jumper from terminal #2 to #3 of
switch and crank generator handle.
Bell rings
Remove
jumper
and Go
to (2) .
Replace BELL.
(Refer to
para 2-19.)
Repeat step 3.
(2) SPEECH CHECKS
Preliminary
Connect headphones with wire terminals at
the end between binding posts.
Press push-to-talk switch on HS and talk
into microphone.
Speech heard
in headphones.
Check
resistance of
transformer.
(Refer to
para 2-15.)
2-23
TM 11-5820-489-34/TO 31R4-2GRA6-42
2-8. OPERATIONAL CHECKS FOR LOCAL CONTROL UNIT
It is necessary to use a HS known to be in good operating condition to properly conduct the
following operational checks. Refer to TM 11-5820-489-20.
Test Setup
●
●
●
●
●
●
●
2-24
Remove outer case cover by loosening two thumb screws (refer to para 2-17).
Install batteries (refer to para 2-20).
Connect good HS to AUDIO connector.
Set SIGNAL SELECTOR switch to BELL position.
Set REMOTE switch to TEL ONLY.
Set LOCAL switch to TEL position.
Use the following illustrations to locate test points.
TM 11-5820-489-34/TO 31R4-2GRA6-42
OPERATIONAL CHECKS
TEST PROCEDURE
INDICATION
YES
NO
(1) RINGING CHECKS
1. Crank generator handle.
Bell rings
Go to 2.
2. Connect a jumper between binding post
L1 and terminal #2 of Signal Selector
switch and crank generator handle.
Lamp lights
Go to 3.
3. Move jumper from terminal #2 and #3
of switch and crank generator handle.
Bell rings
Remove
jumper
and Go
to (2).
Replace
Generator.
(Refer to
para 2-19.)
Replace
Lamp.
(Refer to
para 2-19.)
Repeat step
2.
If NO, remove
jumper and
check resistance of
transformer
or capacitor.
(Refer to
para 2- 16.)
Replace
BELL
(Refer to
para 2-19.)
Repeat step
3.
2-25
TM 11-5820-489-34/T0 31R4-2GRA6-42
OPERATIONAL CHECKS
TEST PROCEDURE
INDICATION
YES
NO
(2) SPEECH CHECKS
Preliminary
Connect headphones with wire terminals at
the end between binding posts.
2-26
1. Press push-to-talk switch on HS and talk
into microphone.
Speech heard
in headphones
Go to 2.
Check resistance of
transformer.
(Refer to
para 2-16.)
2. Set LOCAL switch to SET 1 position,
press push-to-talk switch on HS and talk
into microphone.
No speech
heard in
headphones
Go to 3.
Check
continuity
of LOCAL
switch S3.
3. Set REMOTE switch to SET 1. Connect
headphones between terminals S and d
of J2. Press push-to-talk switch on HS
and talk into microphone.
Speech heard
in headphones
........
Check
continuity
of REMOTE
switch S2.
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-9. VOLTAGE MEASUREMENTS FOR REMOTE CONTROL UNIT
Test Setup
It is necessary to use a HS known to be in good operating condition to properly conduct the
following voltage measurements. Refer to TM 11-5820-489-20.
● Remove outer case cover releasing two snap catches (refer to para 2-17).
● Install batteries (refer to para 2-20).
● Connect good HS to AUDIO connector.
● Set SELECTOR switch to LH write-in position.
● Use Multi meter TS-352B/U.
2-27
TM 11-5820-489-34/T0 31R4-2GRA6-42
VOLTAGE CHECK
TEST PROCEDURE
INDICATION
YES
NO
(1)
1. Connect TS-352B/U between binding
posts. Depress HS push-to-talk switch.
24 Vdc
L1-positive
L2-negative
Go to 2.
Less than
24 Vdc.
Replace
BT3.
(Refer to
para 2-17.)
No voltage,
check continuity of
battery
plug and
wires, SELECTOR
switch,
transformer
and
generator.
2. Release push-to-talk switch.
Zero Vdc
Go to 3.
Check continuity of
SELECTOR
switch.
3. Set SELECTOR switch to TEL position.
Press HS push-to-talk switch.
Zero Vdc
Go to 4.
Check continuity of
SELECTOR
switch.
4. Set SELECTOR switch to MID Write-in
position. Press HS push-to-talk switch.
24 Vdc
L1-negative
L2-positive
Go to (2).
Check continuity of
SELECTOR
switch.
2 to 3 Vdc
E-positive
C-negative
Go to 2.
Replace batteries. (Refer
to para 2-17.)
Repeat step 1
If NO check
continuity of
wires to
transformer
and
transformers.
(2) Disconnect HS from AUDIO connector
1. Connect TS-352B/U between terminals C
and E of J1.
2-28
TM 11-5820-489-34/T0 31R4-2GRA6-42
VOLTAGE CHECK
TEST PROCEDURE
INDICATION
YES
2. Set SELECTOR switch to LH Write-in
position. Connect TS-352B/U between
terminal H of J1 and binding post L2.
30 to 45 Vdc
H-positive
L2-negative
Go to 3.
Check voltage at pin
1 and 3 of
battery plug.
Replace if
below 30
Vdc. Repeat
step 2. If
NO check
continuity
of SELECTOR
switch windings of transformer
and resistance of R2.
3. Set SELECTOR switch to MID Write-in
30 to 45 Vdc
position. Connect TS-352 B/U between ter- H-negative
minal H of J1 and binding post L2.
L2-positive
Go to 4.
Check continuity of
SELECTOR
switch.
4. Connect TS-352B/U between L2 and
terminal 2 of generator. Connect a
jumper between H and F of J1.
30 to 45 Vdc
L2-positive
G1-2-negative
Go to 5.
Replace C1.
(Refer to
para 2-19.)
5. Connect TS-352B/U between L2 and
terminal 3 of generator.
30 to 45 Vdc
L2-positive
G1-3-negative
Go to 6.
6. Connect TS-352B/U between L1 and L2.
30 to 45 Vdc . . . . . . . .
L2-positive
L1-negative
Replace
generator.
(Refer to
para 2-19.)
Replace
transformer.
(Refer to
para 2-19.)
NO
NOTE
Remove jumper from terminals H and F of J1.
2-29
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-10. VOLTAGE MEASUREMENTS FOR LOCAL CONTROL UNIT
Test Setup
●
●
●
●
●
Remove outer case cover by loosening two thumbscrews (refer to para 2-17).
Install batteries (refer to para 2-20).
Set LOCAL switch to TEL position.
Use Multimeter TS-352B/U.
Use the following illustrations to locate test points.
VOLTAGE MEASUREMENTS
TEST PROCEDURE
1. Connect TS-352B/U between terminals C &
E of J1.
2-30
INDICATION
2 to 3 Vdc
E positive
C negative
YES
. . . . . . . . .
NO
Replace
batteries.
Repeat Step
1. If NO,
check continuity of
LOCAL switch
and transformer.
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-11.
REMOTE UNIT GENERATOR G-25/PT OR G-42A/PT CONTINUITY
AND VOLTAGE CHECKS
Test Setup
● Remove outer case cover releasing two snap catches (refer to para 2-17).
● Set SELECTOR switch to TEL position.
● Set SIGNAL SELECTOR switch to BELL position.
● Use Multi meter TS-352B/U.
● Position unit so that rear and numbered terminals of generator are visible.
2-31
TM 11-5820-489-34/T0 31R4-2GRA6-42
GENERATOR
TEST PROCEDURE
INDICATION
YES
NO
(1) CONTINUITY CHECK
1. Connect TS-352B/U between terminal 2
and 3 of generator.
Zero
Go to 2.
2. Crank generator.
Infinity
Go to (2).
Bell rings.
50 Vac
reading.
Remove
jumper.
Replace
generator.
(Refer to
para 2-19.)
Replace
generator.
(Refer to
para 2-19.)
(2) VOLTAGE CHECK
Connect a jumper between L1 and
terminal 3 of the SIGNAL SELECTOR
switch. Connect TS-352B/U between
terminals 1 and 3 of the generator and
crank generator handle.
NOTE
A generator producing 45 volts can be tolerated in service.
2-32
Replace
generator.
(Refer to
para 2-19.)
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-12. LOCAL UNIT GENERATOR G-25/PT OR G-42A/PT CONTINUITY
Test Setup
● Remove outer case cover by loosening two thumbscrews (refer to para 2-17).
● Set LOCAL switch to TEL position.
● Set REMOTE switch to TEL ONLY.
● Set SIGNAL SELECTOR switch to BELL position.
● Use Multi meter TS-352B/U.
● Position unit so that rear of generator and terminals are visible.
2-33
TM 11-5820-489-34/T0 31R4-2GRA6-42
GENERATOR
TEST PROCEDURE
INDICATION
YES
NO
(1) CONTINUITY CHECK
1. Connect TS-352B/U between terminal
2 and 3 of generator.
Zero
Go to 2.
2. Crank generator.
Infinity
Go to (2).
Bell rings.
50 Vac
reading.
Remove
jumper.
Replace
generator.
(Refer to
para 2-19.)
Replace
generator.
(Refer to
para 2-19.)
(2) VOLTAGE CHECK
Connect a jumper between L1 and
terminal 3 of the SIGNAL SELECTOR
switch. Connect TS-352B/U between
terminals 1 and 3 of the generator and
crank generator handle.
NOTE
A generator producing 45 volts can be tolerated in service.
2-34
Replace
generator.
(Refer to
para 2-19.
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-13. REMOTE UNIT RESISTANCE CHECKS
Test Setup
●
●
●
●
●
Remove outer case cover releasing two snap catches (refer to para 2-17).
Disconnect HS.
Remove batteries (refer to para 2-17).
Use Multimeter TS-352B/U.
Use the following illustrations to locate test points.
2-35
TM 11-5820-489-34/T0 31R4-2GRA6-42
NOTE
T1 case configuration may be either round or square.
RESISTANCE CHECK
TEST PROCEDURE
INDICATION
YES
NO
Connect TS-352B/U between:
2-36
1. C of AUDIO connector J1 and battery
spring contact.
10 ohms
Go to 2.
Defective
wiring,
spring contact or
transformer.
2. E of AUDIO connector J1 and battery
flat contact.
Zero ohms
Go to 3.
Defective
wiring or
contact.
3. A and B of AUDIO connector J1.
61 ohms
Go to 4.
Defective
wiring or
transformer.
4. Binding post L1 and terminal 2 of
transformer.
25 ohms
Go to 5.
Defective
wiring or
transformer.
5. F of AUDIO connector J1 and terminal 2
of transformer.
Zero ohms
Go to 6.
Defective
wiring or
generator.
6. H of AUDIO connector J1 and pin 1 of
battery plug. Set SELECTOR to MIDDLE
Write-in position.
680 ohms
Go to 7.
Defective
wiring,
resistor R2
or SELECTOR
switch.
TM 11-5820-489-34/TO 31R4-2GRA6-42
RESISTANCE CHECK
TEST PROCEDURE
INDICATION
YES
NO
7. Pin 3 of battery plug and terminal 3 of
transformer.
Zero ohms
Go to 8.
Defective
wiring or
SELECTOR
switch.
8. H of AUDIO connector J1 and pin 3 of
battery plug. Set SELECTOR switch to
LH Write-in position.
Zero ohms
Go to 9.
Defective
SELECTOR
switch.
9. Pin 1 of battery plug and terminal 3 of
transformer.
680 ohms
Go to 10.
Defective
wiring,
resistor
R2 or
SELECTOR
switch.
10. Pin 3 of transformer and binding post
L2
27 ohms
Go to 11.
Defective
transformer.
11. Negative terminal of call light
E3 and pin 1 of generator.
680 ohms
Go to 12.
Defective
resistor R2.
12. Pin 2 of generator and pin C of
capacitor C1. Set SIGNAL SELECTOR
switch to BELL position.
2,550 ohms
Go to 13.
Defective
bell, SIGNAL
SELECTOR
switch and
capacitor C1.
13. Pin 2 of generator and the positive
terminal of call light E3. Set SIGNAL
SELECTOR switch to LAMP position.
Zero ohms
Go to 14.
Defective
wiring, or
SIGNAL
SELECTOR
switch.
14. Pin 3 of generator and pin B of
capacitor C1.
Zero ohms
Defective
wiring.
2-37
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-14. LOCAL UNIT RESISTANCE CHECKS
Test Setup
●
●
●
●
●
2-38
Remove outer case cover loosening two thumbscrews (refer to para 2-17).
Disconnect HS.
Remove batteries (refer to para 2-17).
Use Multi meter TS-352B/U.
Use the following illustrations to locate test points.
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-39
TM 11-5820-489-34/TO 31R4-2GRA6-42
RESISTANCE CHECK
INDICATION
YES
1. Binding posts L1 and L2. Set REMOTE
switch to SET 1.
26,000 ohms
Go to 2.
Defective
relay 01,
02 or 03,
REMOTE
switch,
capacitor or
generator.
2. Set REMOTE switch to TEL ONLY
position.
Infinity
Go to 3.
Defective
call light,
capacitor
C1 or generator.
3. L1 and terminal 2 of generator.
25 ohms
Go to 4.
Defective
transformer
or generator.
4. L1 and terminal B of capacitor C1.
27 ohms
Go to 5.
Defective
transformer.
5. Terminal A and B of capacitor
C1. Set SIGNAL SELECTOR switch
in BELL position.
2,550 ohms
Go to 6.
Defective
bell or
SIGNAL
SELECTOR
switch.
6. Terminal 2 of generator and positive
terminal of call light. Set SIGNAL
SELECTOR switch to LAMP position.
Zero ohms
Go to 7.
7. C of capacitor Cl and negative terminal
of call light.
680 ohms
Go to 8.
Defective
SIGNAL
SELECTOR
switch.
Detective
resistor R1.
TEST PROCEDURE
NO
Connect TS-352B/U between:
Preliminary
Remove relays 01, 02 and 03 (refer to para 2-19).
8. Terminals 2 and 3 of Relay 01.
16,000 ohms
Go to 9.
Defective
relay.
9. Terminals 2 and 3 of Relay 02.
5,000 ohms
Go to 10.
Defective
relay
2-40
TM 11-5820-489-34/TO 31R4-2GRA6-42
RESISTANCE CHECK
TEST PROCEDURE
INDICATION
YES
NO
10. Pins 2 and 3 of Relay 03
5000 ohms
Go to 11.
11. A of J1 to pin S of J2. Set REMOTE to
TEL ONLY.
Infinity
. . . . . . . .
Zero ohms
Go to 12.
12. Terminal 7 of Relay 02 Socket and N
of J2.
Zero ohms
Go to 13.
13. Terminal 6 of Relay 02 Socket and
Zero ohms
Go to 14.
Defective
wiring.
Zero ohms
Go to 15.
Defective
wiring.
Set REMOTE switch to SET 2.
Zero
. . . . . . . . .
Set REMOTE switch to SET 2.
Infinity
Replace
REMOTE switch.
(Refer to
para 2-19.)
Replace
REMOTE switch.
(Refer to
para 2-19.)
Replace
LOCAL switch.
(Refer to
para 2-19.)
Replace
LOCAL switch.
(Refer to
para 2-19.)
Defective
wiring.
Set REMOTE switch to SET 1.
Terminal 7 of Relay 01 Socket.
14. C of J2 and Terminal 4 of Relay 02.
Replace
relay.
(Refer to
para 2-19.)
Replace
REMOTE switch.
(Refer to
para 2-19.)
Replace
REMOTE switch.
(Refer to
para 2-19.)
Defective
wiring.
15. a of J2 and pin A of capacitor C2.
16. a of J2 and C of J1. Set LOCAL to
SET 2.
Set LOCAL switch to SET 1.
ohms
Zero ohms
Go to 16.
..........
Infinity
Go to 17.
17. C of J1 and battery spring contact.
Zero ohms
Go to 18
18. Battery spring contact and flat contact.
Infinity
Go to 19.
Defective
wiring.
2-41
TM 11-5820-489-34/T0 31R4-2GRA6-42
RESISTANCE CHECK
INDICATION
TEST PROCEDURE
YES
NO
19. Battery flat contact to chassis.
10 ohms
Go to 20.
20. Pin 5 of transformer and pin C of
capacitor C2.
Infinity
Go to 21.
21. Terminal 5 of transformer and
Terminal 8 of Relay 01.
Zero ohms
Go to 22.
22. Terminal 5 of Relay 01 and pin C
of capacitor C2.
Zero ohms
Go to 23.
Defective
wiring.
23. T of J2 and C of J1.
Zero ohms
..........
Defective
wiring or
LOCAL switch.
G O to 24.
Defective
wiring or
LOCAL switch.
Set LOCAL switch to SET 1.
Set LOCAL switch to SET 2.
Infinity
Replace
transformer.
(Refer to
para 2-19.)
Replace
relay 01.
(Refer to
para 2-19.)
Defective
wiring.
24. T of J2 and pin B of capacitor C2.
Set REMOTE switch to SET 1.
Zero ohms
Set REMOTE switch to SET 2.
Infinity
25. Terminal a of J2 to pin C of capacitor
C2.
. . . . . . . . . .
Go to 25
* Infinity
Go to 26.
Replace
capacitor.
(Refer to
para 2-19.)
* Infinity
........
Replace
capacitor.
(Refer to
para 2-19.)
Set REMOTE switch to SET 1 & 2.
26. Terminal T of J2 and pin C of capacitor
C2.
NOTE
* May indicate capacitor charge.
2-42
Replace
REMOTE
switch.
(Refer to
para 2-19.)
Defective
wiring or
REMOTE
switch.
TM 11-5820-489-34/TO 31R4-2GRA6-42
2-15. REMOTE UNIT SUBASSEMBLY RESISTANCE CHECKS
Test Setup
● Remove outer case cover by releasing two snap catches (refer to para 2-17).
● Disconnect HS.
● Remove batteries (refer to para 2-17).
● Use Multi meter TS-352B/U.
● Use the following illustrations to locate test points.
2-43
TM 11-5820-489-34/T0 31R4-2GRA6-42
SUBASSEMBLY
TEST PROCEDURE
INDICATION
YES
NO
(1) TRANSFORMER T1
Connect TS-352B/U between:
1. Pin 1 and 2
25 ohms
Go to 2.
Replace
transformer.
(Refer to
para 2-19.)
2. Pin 3 and 4
27 ohms
Go to 3.
Replace
transformer.
(Refer to
para 2-19.)
3. Pin 5 and 6
10 ohms
Go to 4.
Replace
transformer.
(Refer to
para 2-19.)
4. Pin 7 and 9
61 ohms
............
Replace
transformer.
(Refer to
para 2-19.)
2550 ohms
...........
Replace
bell. (Refer to
para 2-19.)
(2) BELL
Connect TS-352B/U between terminals
of bell.
NOTE
T1 case configuration may be either square or round.
2-44
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-16. LOCAL UNIT SUBASSEMBLY RESISTANCE CHECKS
Test Setup
●
●
●
●
●
Remove outer case cover loosening two thumbscrews (refer to para 2-17).
Disconnect HS.
Remove batteries (refer to para 2-17).
Use Multimeter TS-352B/U.
Use the following illustrations to locate test points.
2-45
TM 11-5820-489-34/T0 31R4-2GRA6-42
SUBASSEMBLY
TEST PROCEDURE
INDICATION
YES
NO
(1) TRANSFORMER T1
Connect TS-352B/U between:
1. Pin 1 and 2
25 ohms
Go to 2.
Replace
transformer.
(Refer to
para 2-19.)
2. Pin 3 and 4
27 ohms
Go to 3.
Replace
transformer.
(Refer to
para 2-19.)
3. Pin 5 and 6
10 ohms
Go to 4.
Replace
transformer.
(Refer to
para 2-19.)
4. Pin 7 and 9
61 ohms
. . . . . . . . . . .
Replace
transformer.
(Refer to
para 2-19.)
2550 ohms
............
Replace
bell.
(Refer to
para 2-19.)
(2) BELL
Connect TS-352B/U between terminals
of bell.
(3) RELAY 01 (Remove)
Connect TS-352B/U between:
2-46
1. Pin 2 and 3
16,000 ohms
Go to 2.
2. Pin 4 and 6
Zero ohms
Go to 3.
3. Pin 6 and 7
Infinity
Go to 4.
Replace
relay.
(Refer to
para 2-19.)
Replace
relay.
(Refer to
para 2-19.)
Replace
relay.
(Refer to
para 2-19.)
TM 11-5820-489-34/T0 31R4-2GRA6-42
SUBASSEMBLY
TEST PROCEDURE
INDICATION
YES
NO
(3) RELAY 01 contd
4. Pin 5 and 8
Infinity
............
Replace
relay.
(Refer to
para 2-19.)
(4) RELAY 02 or 03
Connect TS-352B/U between:
1. Pin 2 and 3
5000 ohms
Go to 2.
Replace
relay.
(Refer to
para 2-19.)
NOTE
One pair of contacts should read zero ohms; the other
should read infinity.
2. Pin 4 and 6
Zero or infinity
............
3. Pin 6 and 7
Zero or infinity
............
Replace
relay.
(Refer to
para 2-19.)
Replace
relay.
(Refer to
para 2-19.)
2-47
TM 11-5820-489-34/T0 31R4-2GRA6-42
Section Ill. MAINTENANCE INSTRUCTIONS
This section will describe the following procedures for Control Group AN/GRA-6:
● Disassembly.
● Cleaning.
● Repair and replacement of parts identified as defective during Troubleshooting procedure.
● Reassembly.
After repairs or replacement have been made to components of Control Group AN/GRA-6 it
should be ready for return to service. To verify its condition conduct the operational checks
described in TM 11-5820-489-20.
2-17. DISASSEMBLY
CAUTION
Always read over and be sure you understand the instructions before attempting disassembly. Use the following illustrations to locate parts and
subassemblies of the unit to be disassembled. Careful removal of parts is
important to avoid damage to the equipment. Small parts such as screws
and washers should be stored in small containers and marked to aid in
reassembly.
Remote Control C-433/GRC
● Use these illustrations for disassembly.
a. Outer Case - To remove outer case, loosen the two snap catches on the side of the
case and slide the unit out of the case.
b. Batteries - Remove the battery compartment cover and batteries in the following
manner:
● Place Remote Control with the panel down on a table with the left side of the unit facing
away from you.
● Grasp the unit with both hands so that your thumbs rest on the two holes in the battery
cover.
● Place your fingers on the side of the chassis where the smaller dry cell batteries (BT1 and
BT2) are visible to prevent them from slipping.
● Press down on the cover and slide it back enough to allow the cover to pop up slightly.
● Now slide the cover forward until it is released.
● Remove the cover.
● Remove the small dry cell batteries BT1 and BT2.
● Remove battery connector plug P1 and remove BT3.
2-48
TM 11-5820-489-34/TO 31R4-2GRA6-42
c.
Call Light - Remove the call light holder in the following manner:
● Grasp the call light socket cap and pull it straight back out of the panel.
● Be careful not to break any wires or damage parts.
CAUTION
Be careful when removing the panel from the chassis to avoid damage to
the connecting cable.
d. Panel - The panel should be removed only when it is necessary to repair a part on the
panel. emove the panel in the following manner:
● Locate the four machine screws, one at each corner of the chassis, which hold the
panel in place.
● Remove these four screws and save for reassembly.
● Pull the panel gently away from the chassis frame.
2-49
TM 11-5820-489-34/T0 31R4-2GRA6-42
Local Control
● Use these illustrations for disassembly.
a. Outer Case - Remove the outer case in the following manner:
● Remove the cap covering connector J2 at the rear of the unit.
● Press down thesnap latch at the top rear of the unit and open the cable compartment
cover.
● Mount the J2 cover cap on the brackets inside the cable compartment cover.
2-50
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Release the two thumbscrews on the front panel to disengage the panel from the outer case.
● Place Local Control panel down, on a table and lift off the cover.
● Feed the cables and the cable connectors through the hole in the cable compartment.
NOTE
It may be difficult sliding connector J2 through the hole in the case. This
usually happens when the two O-rings on connector J2 are swollen.
Apply a small amount of vaseline or PC-4 grease to the O-rings. Connector J2 should slide through the hole easily.
b. Batteries - Remove the battery compartment cover and batteries in the following
manner:
● Locate the plastic battery container in the battery compartment.
● Press the snap catch which holds the battery container cover in place and remove the
cover.
● Remove dry cell batteries BT1 and BT2.
c. Call Light - Remove the call light holder in the following manner:
● Grasp the call light socket and pull it straight back out of the panel.
● Be careful not to break any wires or damage parts.
2-51
TM 11-5820-489-34/T0 31R4-2GRA6-42
CAUTION
Be careful when removing the panel from the chassis to avoid damage to
the connecting cable.
d. Panel - The panel should be removed only when it is necessary to repair a part on the
panel. Remove the panel in the following manner:
● Locate the four machine screws, one at each corner of the chassis, which hold the
panel in place.
● Remove these four screws and save for reassembly.
● Pull the panel gently away from the chassis frame.
Visual Inspection
With Remote Control or Local Control disassembled it is simple to inspect all parts and wiring
for any abnormal conditions. The causes of any abnormal conditions should be isolated and
repaired. Specific repair and replacement procedures are covered in para 2-19. Now conduct the
following visual checks:
●
●
●
●
●
●
Inspect
Inspect
Inspect
Inspect
Inspect
Inspect
battery
tacts.
● Inspect
all parts for rust, corrosion, dirt, breakage or other damage.
wiring for loose connections and frayed or burnt insulation.
mounting hardware for mechanical defect, i.e., stripped threads, etc.
transformer T1, ringing generator and switches for loose or broken lugs.
all mounting hardware for looseness or defects.
all battery contacts (flat and spring type) within the battery compartment and
compartment cover for corrosion or broken, loose or damaged springs or conthe plug-in socket of BT3 for defects.
● Inspect battery plug P1 for pin or wire damage.
2-18. CLEANING
Dirt and corrosion interfere with electrical continuity and mechanical operation of equipment.
All parts of the panel and chassis should be cleaned carefully. Use a lint-free cloth and dampen if
necessary for most cleaning tasks. Always use a dry, lint-free cloth to wipe off the part or area
that was cleaned.
Only use a cleaning solvent when absolutely necessary. Make sure that the cleaning compound
is approved and that the following warnings are followed:
Adequate ventilation should be provided while using TRICHLOROTRlFLUOROETHANE. Prolonged breathing of vapor should be avoided.
The solvent should not be used near heat or open flame; the products
of decomposition are toxic and irritating. Since TRICHLOROTRIFLUOROETHANE dissolves natural oils, prolonged contact with skin should
be avoided. When necessary, use gloves which the solvent cannot
penetrate. If the solvent is taken internally, consult a physician
immediately.
2-52
TM 11-5820-489-34/T0 31R4-2GRA6-42
2-19. REPLACEMENT OF PARTS
Replacement of parts or subassemblies for Control Group AN/GRA-6 should be based on one
or more of the following:
●
●
●
●
Visual inspection reveals an obvious defect.
Operation checks reveal a possible fault.
Troubleshooting procedure reveals a possible fault.
Test results reveal a fault.
CAUTION
Perform operational checks after every repair or replacement. Refer to
paragraph 2-7 or 2-8.
NOTE
When operation checks or troubleshooting procedures reveal a possible fault, an actual voltage or resistance measurement test should be
performed to verify the fault. Make sure that all the TEST SETUP steps
are followed and the correct points of measurement are used. Except
for an obviously broken, burnt or corroded part, no part or subassembly
should be replaced without using every possible means to verify the
fault.
NOTE
When repairing or replacing parts or subassemblies of Control Group
AN/GRA-6 remember the following:
● Tag leads or wires to ensure correct rewiring.
● Clean the unit thoroughly to remove all solder drops, metal chips or
foreign matter after completing repairs or replacement.
● Support the unit or subassembly properly to avoid straining or
breaking wire connections between parts or subassemblies.
● Use a heat sink when soldering and unsoldering.
Remote Control C-433/GRC
Replacement of many parts in Remote Control requires disassembly of the unit as described in
para 2-17. Disassembly will divide the unit into three subassemblies:
● Panel Group
● Chassis Group
● Battery Cover Group.
2-53
TM 11-5820-489-34/T0 31R4-2GRA6-42
Panel Group
Disassembly Not Required/Outer Cover Removed
a. Luggage Catch/D-Ring. The luggage catch also serves as a mounting point for the
D-Ring.
● Remove the four screws mounting the luggage catch to panel.
● Remove luggage catch and D-ring.
● Install replacement luggage catch and/or D-ring using four mounting screws.
● Tighten four mounting screws.
b.
Selector Switch Marker Disc
● If marker disc is broken remove any pieces still mounted on the panel.
● Clean out the mounting area on the panel.
● Install the replacement disc using a suitable glue.
c.
●
●
●
●
2-54
Call Light Socket
Grasp the indicator light and pull it straight back out of the panel socket and remove bulb.
Unsolder and tag the wires from the back of the call light socket.
Solder the wires to the replacement call light socket.
Carefully replace the call light socket.
TM 11-5820-489-34/T0 31R4-2GRA6-42
d. Binding Posts (Includes Insulator and Extruded Washers)
● Locate the binding post at the rear of the panel and unsolder the wire from the stud. Tag
the wire.
● Remove the nut which holds the binding post in place. It is at the rear of the binding
post.
● Pull the binding post out from the front of the panel and save the extruded washer and
insulator washer unless they are to be replaced. Note the order of the washers.
● Install the replacement binding post, extruded washer and insulator washer into the
panel from the front.
● Install the binding post attaching nut to the binding post from the rear of the panel. Do
not strip the threads.
● Solder the tagged wire to the binding post stud.
Disassembly Required
Replacement of the following parts in the panel group requires disassembly. See paragraph 2-9
for disassembly procedures for Remote Control.
e. Gasket
● Remove the gasket from the groove on the rear of the panel.
● Clean out the groove, removing all old gasket material and dirt.
● Apply DC-4 grease or an approved sealing compound to the new gasket.
● Install the new gasket in the groove, be sure it fits properly.
2-55
TM 11-5820-489-34/TO 31R4-2GRA6-42
f. Audio Connector J1
● Insert a spanner wrench in the notches of the nut which secures J1 to the front of the panel.
●
●
●
●
Turn the wrench counterclockwise until the nut is completely loose.
Remove the nut and lock washer.
Unsolder and tag all wires.
Remove J1 from the rear of the panel.
●
●
●
●
●
●
Make sure the replacement J1 has a rubber gasket.
Resolder the wires to the new J1.
Remove all solder drops.
Insert the replacement J1 in the panel from the rear.
Attach the lock washer and nut onto the threaded portion of J1. Do not strip the threads.
Tighten the nut finger tight and then tighten securely with the spanner wrench.
g. Resistor R2
● Resistor R2 is attached to the rear of SELECTOR switch S2.
● Carefully unsolder R2 and tag the wire which is attached with R2 to S2.
● Solder the replacement R2 to the rear of S2 and the previously tagged wire.
2-56
TM 11-5820-489-34/T0 31R4-2GRA6-42
h. SELECTOR Switch S2
● Unsolder and tag all wires from the switch.
● Remove the switch knob retaining screw and knob from the front of the panel.
● Remove the castellated retaining nut from the front of the panel using a spanner
wrench.
● Remove the switch from the rear of the panel.
● Insert the replacement switch into the panel from the rear. Make sure the key on the
switch fits into the slot in the panel.
● Handle the switch carefully to avoid breaking the wafer.
● Restore the castellated retaining nut using a spanner wrench and tighten. Do not strip
the threads.
● Restore the switch knob and retaining screw and tighten.
● Check the operation of the switch in each operating position.
● Resolder the wires to the switch.
● Remove all solder drops.
2-57
TM 11-5820-489-34/T0 31R4-2GRA6-42
i. Generator
● The generator is replaced as a unit assembly.
● emove the screw and lock washer which hold the generator crank handle.
● Slide the crank off the shaft.
●
●
●
●
●
Disconnect the wires attached to the rear of the generator and tag.
se a spanner wrench and remove the nut which holds the generator to the panel.
Pull the generator out from the rear of the panel.
nstall the replacement generator into the panel.
Restore the nut which holds the generator to the panel and tighten it. Do not strip the
threads.
● Reattach the wires to the rear of the generator.
● Install the generator crank handle on the shaft.
● Install the lock washer and screw which hold the crank handle and tighten.
Chassis Group
Replacement of most parts in the chassis group can be made without disassembly.
the battery cover before proceeding.
a. Battery Connector Plug P1
● Heat pins 1 and 3 with soldering iron to remove wires and tag them.
● Solder the wires to the replacement battery plug.
2-58
Remove
TM 11-5820-489-34/T0 31R4-2GRA6-42
b. Telephone Ringer (Bell)
● Remove the two machine screws which mount the rinser to the chassis.
● Lift the ringer out of the compartment being careful not to strain or break wires or connections.
●
●
●
●
At the terminal board unsolder the wires connecting to the ringer.
Resolder the wires from the replacement bell to the terminal board.
Restore the bell in its compartment in the chassis.
Install the two mounting screws and tighten.
c. Transformer T1
● Remove the two machine screws which mount the transformer to the chassis.
● Carefully lift the transformer straight-up out of the chassis. Be careful not to strain or break
any wires or connections.
●
●
●
●
Unsolder and tag the wires connected to the transformer.
Resolder the wires to the replacement transformer.
Put the transformer back into its place in the chassis.
Install the two machine screws mounting the transformer to the chassis and tighten.
2-59
TM 11-5820-489-34/T0 31R4-2GRA6-42
d. Capacitor C1
● Remove the two machine screws, lock washers and nuts mounting the capacitor to the
chassis.
●
●
●
●
●
Carefully lift the capacitor out of the chassis being careful not to strain or break any
wires or connections.
Unsolder and tag the wires connected to the capacitor.
Resolder the wires to the replacement capacitor.
Put the capacitor into its compartment in the chassis.
Install the two mounting screws and tighten.
e. Toggle Switch S1
● Use a wrench to remove the nut which mounts the switch to its mounting plate.
● Pull the switch out of the mounting plate.
● Unsolder and tag the wires connected to the switch.
2-60
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Resolder the wires to the replacement switch.
● Restore the switch to the mounting plate.
● Install the mounting nut and tighten.
f. Battery Contacts. If either contact of the battery contact assembly is damaged or corroded replace the entire assembly in the following manner:
● Drill out the four rivets which mount the contact assembly to the chassis.
NOTE
If the contact assembly has been replaced before, it may be attached with
machine bolts, lock washers, and nuts instead of rivets.
● Lift the contact assembly out of its compartment being careful not to break any wires or
connections.
● Unsolder the wires connected to the contact assembly.
● Resolder the wires to the replacement contact assembly.
● Install the contact assembly in its proper location in the chassis.
● Fasten the contact assembly to the chassis using machine bolts, lock washers and nuts.
NOTE
Clean corroded contacts before replacing the contact assembly.
2-61
TM 11-5820-489-34/T0 31R4-2GRA6-42
g. Resistor R1
● Resistor R1 is located on two standoffs close to the telephone ringer and transformer T1.
● Carefully unsolder R1.
● Solder the replacement R1 in position.
a. Battery Contacts
●
●
●
●
Drill out the four rivets which mount the contact assembly to the battery cover.
Lift the assembly off the cover.
Put the replacement contact assembly on the cover.
Using machine bolts, lock washers and nuts, mount the contact assembly to the cover
and tighten.
b. Spring Holder (Battery)
● Drill and remove the rivets or remove the machine bolts and nuts which mount the
spring holder to the battery cover.
● Remove the spring holder.
● Install the replacement spring holder.
● Restore the nuts and tighten.
Local Control C-434/GRC
Replacement of many parts in Local Control requires disassembly of the unit as described in
paragraph 2-17. Disassembly will divide the unit into these subassemblies:
● Panel Group
● Chassis Group
● Cable Compartment Group
The part to be repaired or replaced will be located in one of these three subassemblies of
Local Control. Use the following illustrations to locate the part and proceed to the following subparagraph dealing with repair or replacement of parts in that subassembly.
2-62
TM 11-5820-489-34/T0 31R4-2GRA6-42
Panel Group
Disassembly Not Required
a. Thumbscrew
● Remove outer case.
● Turn thumbscrew to a horizontal position.
● Remove the two machine screws which secure thumbscrew to panel.
● Pull the thumbscrew assembly away from the panel.
● Install the replacement thumbscrew assembly on the panel.
● Install the two mounting screws and tighten.
b. Indicator Light
● Remove battery cover for BT1 and BT2.
● Remove BT1 and BT2.
● Grasp the indicator light and pull it straight back out of the panel socket.
● Be careful not to break any wires or damage any parts.
● Unsolder and tag the wires from the back of the indicator light.
● Solder the wires to the replacement indicator lamp.
● Carefully replace the indicator light in the panel socket.
● Install BT1 and BT2.
● Install the battery cover.
2-63
TM 11-5820-489-34/T0 31R4-2GRA6-42
Disassembly Required
Replacement of the following parts in the panel group requires disassembly. See paragraph
2-17 for disassembly procedures for Local Control.
c. Gasket
●
●
●
●
Remove the gasket from the groove around the back of the panel.
Clean out the groove, removing all old gasket material and dirt.
Apply DC-4 grease or an approved sealing compound to the new gasket.
Install the new gasket in the groove ensuring proper fit.
d. Binding Post (Includes Insulator and Extruded Washers)
● Unsolder and tag the wire from the rear of the binding post.
● Remove the nut which holds the binding post in place at the rear of the panel.
● Pull the binding post out from the front of the panel and save the extruded washer and
insulator washer unless they are to be replaced. Note the order of the washers.
● Install the replacement binding post, extruded washer and insulator washer in the panel
from the front.
● Fasten the binding post attaching nut to the binding post from the rear of the panel. Do
not strip the threads.
● Solder the tagged wire to the binding post stud.
2-64
TM 11-5820-489-34/T0 31R4-2GRA6-42
e. Audio Connector J1
● Insert a spanner wrench in the notches of the nut which secures J1 to the panel.
● Turn the wrench counterclockwise until the nut is completely loose.
● Remove the nut and lock washer.
● Unsolder and tag all wires.
●
●
●
●
●
●
Remove J1 from the rear of the panel.
Make sure the replacement J1 has a rubber gasket.
Resolder the wires to the new J1.
Remove all solder drops.
Insert the replacement J1 into the panel from the rear.
Attach the lock washer and nut onto the threaded portion of J1 from the front of the
panel.
● Tighten the nut finger tight and then tighten securely with the spanner wrench.
f. Rotary Switches S2 and S3
For replacement of REMOTE Switch (S2) and LOCAL Switch (S3) use the following procedure:
● Unsolder and tag all wires from the switch.
2-65
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Remove the switch knob retaining screw and knob from the front of the panel.
● Remove the castellated retaining nut from the front of the panel using a spanner
wrench.
● Remove the switch from the rear of the panel.
● Insert the replacement switch into the panel from the rear. Make sure the key on the
switch fits into the slot in the panel.
● Handle the switch carefully to avoid damaging the wafer.
● Replace the castellated retaining nut using a spanner wrench.
● Replace the knob and retaining screw and tighten.
● Check the operation of the switch in each operating position.
● Resolder the wires to the switch and remove tags.
● Remove all solder drops.
g.
●
●
●
●
●
●
●
2-66
Generator
The generator is replaced as a unit assembly.
Remove the screw and lock washer which hold the generator crank to the front panel.
Slide the crank off the shaft.
Tag and disconnect the wires attached to the rear of the generator.
Use a spanner wrench and remove the nut which holds the generator to the panel.
Pull the generator out from the rear of the panel.
Install the replacement generator into the panel.
TM 11-5820-489-34/TO 31R4-2GRA6-42
● Restore the nut which holds the generator to the panel and tighten it. Do not strip the
threads.
● Reattach the wires to rear of the generator and remove tags.
● Install the generator crank handle on the shaft.
● Install the lock washer and screw which hold the crank to the front panel and tighten.
Chassis Group
Disassembly Not Required
a.
Cable Assembly
● Remove two machine screws which secure the cover over the packing nuts.
● Remove the cover.
● Use a wrench and loosen the packing nuts which fasten the cable assembly to the
mounting points on the chassis.
● Remove battery cover, BT1, BT2 and battery holder.
● Remove transformer T1 mounting screws.
● Pull T1 up and out of the chassis being careful not to break any wires or connections.
(See steps in d. below)
● Remove two machine screws mounting terminals board to chassis.
● Pull terminal board out of chassis carefully.
● Tilt terminal board for access, unsolder and tag all connections from cable assembly.
● Remove the cable assembly, packing nuts and washers.
2-67
TM 11-5820-489-34/T0 31R4-2GRA6-42
●
●
●
●
●
●
●
●
2-68
Install replacement cable assembly.
Solder all wires and connections to terminal board from replacement cable assembly.
Install terminal board in chassis with two mounting screws and tighten.
Replace T1 and mounting screws in chassis and tighten.
Replace battery holder with four mounting screws.
Replace BT1 and BT2 if equipment will be used or tested in the near future.
Replace battery cover.
Replace the packing nuts, washers and replacement cable assembly to the mounting points
on the chassis.
● Handtighten the packing nuts. Do not strip the threads.
● Use a wrench and tighten the packing nuts.
● Replace the cover over the packing nuts.
● Replace the two mounting screws and tighten.
TM 11-5820-489-34/TO 31R4-2GRA6-42
b. Gaskets (O-rings)
●
●
●
●
Remove the O-ring from the groove around receptacle connector J2.
Clean out the groove, removing all old gasket material and dirt.
Apply DC-4 grease or an approved sealing compound to the new O-ring.
Install the new O-ring in the groove ensuring proper fit.
c. Resistor R1
● Resistor R1 is attached to the terminal board located near the telephone ringer and
transformer T1.
● Carefully unsolder R1 from the terminal board and tag the leads.
NOTE
If difficulty is encountered unsoldering R1 remove the two machine screws
mounting transformer T1 and pull T1 up out of the chassis.
● Solder the replacement R1 to the terminal board.
● If T1 was removed install it in the chassis.
● Restore the two mounting screws and tighten.
2-69
TM 11-5820-489-34/T0 31R4-2GRA6-42
d. Transformer T1
● Remove battery cover and BT1 and BT2.
● Remove the four battery holder mounting screws.
● Remove the battery holder.
●
●
●
●
●
●
●
●
2-70
Remove the two T1 mounting screws.
Lift T1 out of the chassis being careful not to break any wires or connections.
Unsolder and tag the wires connected to T1.
Resolder the wires to the replacement T1.
Replace T1 in the chassis.
Install the two T1 mounting screws and tighten.
Install BT1 and BT2 if equipment will be used or tested in the near future.
Replace battery cover.
TM 11-5820-489-34/T0 31R4-2GRA6-42
e. Telephone Ringer (Bell)
●
●
●
●
●
Remove battery cover, BT1, BT2.
Remove transformer T1 mounting screws.
Move T1 away from the ringer.
Remove the two ringer mounting screws.
Pull ringer out of chassis carefully.
●
●
●
●
●
●
●
Unsolder and tag the wires.
Solder the wires to replacement ringer.
Replace ringer in chassis.
Install two mounting screws and tighten.
Replace T1 and two mounting screws and tighten.
install BT1 and BT2 if equipment will be used or tested in the near future.
Install battery cover.
f. Terminal Board
● Remove battery cover, BT1, BT2 and battery holder.
● Remove transformer T1 mounting screws.
● Pull T1 up and out of the chassis being careful not to break any wires or connections.
(See steps in d. on page 2-70.)
● Remove two machine screws mounting terminal board to chassis.
2-71
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Pull terminal board out of chassis carefully.
● Tilt terminal board for access and unsolder and tag all wires and connections.
●
●
●
●
●
●
Solder all wires and connections to replacement terminal board and remove tags.
Install terminal board in chassis with two mounting screws and tighten.
Replace T1 and mounting screws in chassis and tighten.
Replace battery holder with four mounting screws.
Replace BT1 and BT2 if equipment will be used or tested in the near future.
Replace battery cover.
g. Capacitors C1 and C2
● Procedure is identical for replacement of capacitor Cl and C2.
● Remove the machine screws which mount the capacitor to the chassis.
● Remove the capacitor from its compartment.
●
●
●
●
2-72
Unsolder and tag the wires attached to the capacitor terminals.
Resolder the wires to the replacement capacitor.
Install the replacement capacitor in the compartment and remove tags.
Install the machine screws and tighten.
TM 11-5820-489-34/TO 31R4-2GRA6-42
h. Toggle Switch S1
● Unsolder and tag the wires attached to the toggle switch.
●
●
●
●
●
With a wrench, remove the nut which mounts the switch to its mounting plate.
Pull the switch out of the mounting plate.
Install the replacement switch on the mounting plate.
Restore the mounting nut and tighten.
Resolder the wires to the replacement switch and remove tags.
i. Battery Contacts
Cover - If either or both of the battery contacts on the battery cover are badly corroded or
damaged replace the entire cover.
Chassis - If either or both of the battery contacts on the chassis mounted contact strip are badly corroded or damaged replace the entire strip in the following manner:
● Remove battery cover, BT1, BT2 and battery holder. See steps in 4. above
● Drill out the four rivets mounting the contact strip to the chassis.
●
●
●
●
Remove the contact strip.
Unsolder the wires connected to the contact strip.
Remove all metal chips and solder drops from the chassis.
Solder the wires to the replacement contact strip.
2-73
TM 11-5820-489-34/T0 31R4-2GRA6-42
●
●
●
●
●
Install
Using
Install
Install
Install
the contact strip in the chassis.
machine bolts, lock washers and nuts, mount the contact strip to the chassis.
battery holder and four machine screws and tighten.
BT1 and BT2 if equipment will be used or tested in the near future.
battery cover.
j. Relays 01, 02, 03
● Loosen and remove the two screws which hold the relay compartment cover in place.
● Remove the cover.
CAUTION
Relay pins are easily damaged. Use extreme care when removing relays.
● Carefully pull the relay to be replaced out of the socket. Rock relay back and forth if
necessary.
● Install the replacement relay.
● Install the relay compartment cover.
● Tighten the mounting screws.
k. Relay Tube Sockets
● Remove relay cover and relays. See steps in 10. above.
● Remove battery cover, BT1, BT2 and battery holder. See steps in d. above.
● Drill out rivets which mount the relay socket to be
replaced.
2-74
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Pull the socket and turn it to gain access to the solder points.
●
●
●
●
●
●
Unsolder and tag the wires attached to the socket.
Solder the wires to the replacement socket and remove tags.
Replace the socket in the chassis recess.
Using bolts, lock washers and nuts mount the relay socket to the chassis.
Replace battery holder, BT1, BT2 and battery cover.
Replace relays 01, 02, 03 and relay cover.
Disassembly Required
l.
Receptacle Connector J2
● Remove relay cover and relays.
See step j. on page 2-74
● Remove bolts, lock washers and nuts (4 ea) which mount J2 to chassis.
●
●
●
●
●
Remove flange. Do not break any wires or
Remove five machine screws which secure
Move the relay subassembly away from J2
Remove O-rings.
Pull the flange and J2 assembly in through
connections.
the relay subassembly to the chassis.
within the chassis.
the hole in the chassis.
2-75
TM 11-5820-489-34/T0 31R4-2GRA6-42
● Unsolder and tag the wires attached to J2.
● Solder wires to replacement J2 and remove tags.
● Insert J2 back out through the hole in the chassis.
● Install the flange and align it with the holes in the chassis and J2.
● Install bolts, lock washers and nuts (4 ea) through the holes securing J2 to the chassis.
● Tighten four bolts.
● Replace relay subassembly using five machine screws and tighten.
● Replace panel.
● Replace relays 01, 02, 03 and relay cover.
2-20. REASSEMBLY
If disassembly was necessary to repair either component of Control Group AN/GRA-6 follow
these instructions for reassembly:
Remote Control
a. Call Light Socket
● Install the call light socket in the panel before installing the panel assembly to the chassis
assembly.
● Install the call light socket into its mounting hole on the panel assembly.
b. Panel
● Install the panel on the chassis lining up the holes on the panel and chassis.
● Make sure that no wires will be pinched between the panel and chassis.
● Install the four machine screws which mount the panel to the chassis and tighten.
c. Batteries
● If the equipment is to be used again soon, install batteries BT1, BT2 and BT3.
d. Battery Compartment Cover
● Place Remote Control with the panel down and the left side of the unit facing
away from you.
● Place the compartment cover on the back of the unit with the projections aiming
towards you and lined up with the chassis bracket angles.
● Depress the cover slightly and slide the cover projections under the chassis bracket
angles.
● Depress the other end of the cover and slide it under the tab on the chassis securing
the cover.
e. Outer Case
● Slide the unit into the outer case.
● Fasten the snap catches and secure the outer case to the unit.
2-76
TM 11-5820-489-34/T0 31R4-2GRA6-42
CHAPTER 3
GENERAL SUPPORT MAINTENANCE
PAGE
Control Circuits Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
General instructions, Testing Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
General instructions, Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . 3-1
Physical Tests and lnspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Repair Parts, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Signaling and lnterphone Test, interconnecting Box J-654/6 . . . . . . . . . . . . . . . . . . 3-7
Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Section I. REPAIR PARTS, SPECIAL TOOLS, TMDE AND SUPPORT EQUIPMENT
3-1 .
SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT
NOMENCLATURE
5820-00-113-9769
5820-00-402-2263
6625-00-242-5023
Power Supply PP-4763( )/GRC
Radio Set AN/GRC-106( )
Muitimeter TS-352( )/U
Dummy Load, Electrical DA-75/U
Decade Resistor ZM-16( )/U
Handset H-33( )/PT
6625-00-669-0266
5965-00-163-9947
Battery
Battery
Hookup
Hookup
6135-00-120-1020
6135-00-125-5256
6145-00-548-2434
6145-00-548-2344
BA-30/U, 1.5V
BA-414/U, 45V
wire #22 AWG, 4 feet
wire #22 AWG, 4 feet
REMARKS
NATIONAL STOCK NO.
2 required
In addition to handset supplied
with AN/GRA-6.
4 required
Black
3-2. REPAIR PARTS
Refer to TM 11-5820-489-34P.
Section Il. TROUBLESHOOTING PROCEDURES
3-3. GENERAL Instructions
Use the troubleshooting procedures covered in Chapter 2 of this manual to isolate and correct troubles in Control Group AN/GRA-6.
3-1
TM 11-5820-489-34/T0 31R4-2GRA6-42
Section Ill. TESTING PROCEDURE
3-4. GENERAL INSTRUCTIONS
The following testing procedures are necessary to verify the performance standards for Control
Group AN/GRA-6 for general support level maintenance and overhaul as authorized by the
Maintenance Allocation Chart. If a part, subassembly, component, etc., does not meet the performance standard, the fault should be isolated and corrected using the troubleshooting,
disassemble and repair sections of Chapter 2 of this manual. The Source, Maintenance and
Recoverability (SMR) code of the affected part should be determined by consulting TM
11-5820-489-34P.
3-5. PHYSICAL TESTS AND INSPECTION
Test Setup
●
●
●
●
Disconnect all connections to Control Group AN/GRA-6.
Controls may be in any position.
Test applies to both C-433/GRC and C-434/GRC.
No test equipment needed.
INDICATION
TEST
Check SELECTOR, REMOTE, LOCAL and
BELL-LAMP switches for correct operation.
All switches should operate freely without
binding.
Check Generator for proper operation.
Generator should crank without binding.
Check cable assemblies for cuts and breaks
in insulation.
Wires and cables should have no deep cuts in
insulation.
Inspect all connectors, lamps, and cover
plates for damage and missing parts.
Connectors, lamps, and cover plates should not
have missing parts or be damaged so as to
prevent proper operation.
Inspect both components for physical damage
such as dents, punctures, and bent areas.
There should be no physical damage serious
enough to prevent proper operation.
Inspect both components for condition of
finish and panel markings.
Surfaces originally painted should not show bare
metal. Panel markings should be legible.
3-6. CONTROL CIRCUITS TEST
Test Equipment and Material
Power Supply PP-4763( )/GRC
Dummy Load, Electrical DA-75/U
Radio Set AN/GRC-106
Handset H-33( )/PT
Multimeter TS-352( )/U
Decade Resistors ZM-16( )/U (2)
Test Setup
● Install batteries in C-433/GRC and C-434/GRC.
● Use Multi meter TS-352( )/U when applicable.
● Hook up equipment as shown in illustration.
3-2
TM 11-5820-489-34/TO 31R4-2GRA6-42
3-3
3-4
STEP
NO.
1
TEST EQUIPMENT
CONTROL SETTINGS
PP-4763( )/GRC: AC
ON Switch: ON AN/
GRC-106.
Follow tuning
procedures in
TM 11-5820-520-10
ZM-16( )/U X-100
Switch: 2 X-10
Switch: 5 All other
switches: 0
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
TEST PROCEDURE
PERFORMANCE STANDARD
C-434/GRC: LOCAL
switch: SET 1
REMOTE switch:
Any position
except TEL ONLY
a. C-434/GRC - press
push-to-talk switch on
H-33( )/PT and speak
into mouthpiece.
a. DA-75/U meter indicates
operation of transmitter.
Local operator’s voice can
be heard at both C-434/
GRC and C-433/GRC.
C-433/GRC:
SELECTOR switch:
any position
b. C-434/GRC - release
push-to-talk switch on
H-33( )/PT.
b. Receiver noise can be
heard at both C-434/GRC
and C-433/GRC.
c. C-434/GRC - turn
LOCAL switch to TEL
position and REMOTE
switch to SET 1.
c. DA-75/U meter indicates
operation of transmitter.
REMOTE operator’s voice
can be heard at both
C-434/GRC and C-433/GRC.
C-433/GRC - turn
SELECTOR switch to
left-hand write-in
position. Press push-totalk switches on
H-33( )/PT at C-433/GRC
and speak into
mouthpiece.
TM 11-5820-489-37/T0 31R4-2GR
STEP
NO.
TEST EQUIPMENT
CONTROL SETTINGS
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
1
(cont)
2
Same as for step 1
above.
C-434/GRC: LOCAL
switch: SET 2.
Disconnect P1 from
AUDIO connector on
RT-662/GRC or RT834/GRC and connect
P2 in its place.
REMOTE switch:
any position except
TEL ONLY
C-433/GRC
SELECTOR switch:
any position
TEST PROCEDURE
d. C-433/GRC -release
push-to-hold switch on
H-33( )/PT. Turn
REMOTE switch
C-434/GRC to SET 1 & 2.
Press push-to-talk
switch on H-33( )/PT at
C-433/GRC and speak
into mouthpiece.
d. Same as above.
a. C-434/GRC - press
push-to-talk switch on
H-33( )\PT and speak
into mouthpiece.
a. DA-75/U meter indicates
operation of transmitter.
Local operator’s voice can
be heard at both local and
remote control units.
b. C-434/GRC - release
push-to-talk switch on
H-33( )/PT.
c. C-434/GRC - turn
LOCAL switch to TEL
and REMOTE switch to
SET 2.
C-433/GRC - turn
SELECTOR switch to
left-hand write-in position. Press push-to-talk
switch on H-33( )/PT at
C-433/GRC and speak
into mouthpiece.
3-5
3-5
PERFORMANCE STANDARD
b. Receiver noise can be
heard at both C-434/GRC
and C-433/GRC.
c. DA-75/U meter indicates
operation of transmitter.
Remote operator’s voice
can be heard at both
C-434/GRC and C-433/GRC.
TM 11-5820-489-34/T0 31R4-2GR
3-6
STEP
NO.
TEST EQUIPMENT
CONTROL SETTINGS
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
2
(cont)
3
TS-352( )/U
FUNCTION switch:
OHMS
C-434/GRC:
REMOTE switch:
TEL ONLY
RANGE switch: RX1
LOCAL switch:
Set 1
TEST PROCEDURE
PERFORMANCE STANDARD
d. C-433/GRC - release
push-to-talk switch on
H-33( )/PT. Turn
REMOTE switch to SET
1 & 2. Press push-to-talk
switch on H-33( )/PT on
C-433/GRC and speak
into mouthpiece.
d. Same as above.
e. C-433/GRC - release
push-to-talk switch on
H-33( )/PT. Turn SELECTOR switch to righthand write-in position.
Press push-to-talk
switch on H-33( )/PT
a. Turn off and
disconnect all
equipments. Remove all
equipment except
C-434/GRC. Disconnect
all connectors and
field wire from the
binding posts.
e. Same as c. above.
TM 11-5820-489-34/T0 31R4-2GRA6-
a. None.
b. Place black test lead
of TS-352( )/U on pin M
of J2. Briefly touch red
test lead to all other
pins of J2 except pins
a and b.
b. TS-352( )/U should
indicate infinity.
c. Touch red test lead
to pin J of P1.
C. TS-352( )/U should
indicate 0 ohm.
d. Touch red test lead
to pin A, C and F of P1.
d. Same as b.
e. Touch red test lead
to pin J of P2.
e. Same as c.
STEP
NO.
3
(cont)
TEST EQUIPMENT
CONTROL SETTINGS
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
TEST PROCEDURE
PERFORMANCE STANDARD
f. Touch red test lead
to pins A, C and F of
P2.
f. Same as b.
g. Coil up cable
assemblies W1 and W2
and replace in cable
compartment of
C-434/GRC.
g. None.
Interconnecting Box J-654/G
Signaling and Interphone Test
Test Setup
● Install batteries in C-433/GRC and C-434/GRC.
● Use Multimeter TS-352( )/U.
● Connect all equipment as shown in the following illustration.
● Leave outer case cover off C-433/GRC and C-434/GRC.
TM 11-5820-489-34/T0 31R4-2GRA6-
3-7
3-83-8
TM 11-5820-489-34/T0 31R4-2GR
TEST EQUIPMENT
CONTROL SETTINGS
ZM-16( )/U: X 100
Switch: 2 X 10
Switch: 5
C-433/GRC:
SELECTOR switch:
TEL
All other switches: 0
BELL-LAMP
switch: BELL
TEST PROCEDURE
PERFORMANCE STANDARD
a. Crank ringing
generator on C-433/GRC.
Note meter indication
on TS-353( )/U and
perform the following:
a. TS-352( )/U should
indicate at least 45 volts
AC (0.45 on top AC scale).
C-434/GRC:
REMOTE switch:
TEL ONLY.
(1) Listen with H-33( )/PT
at C-433/GRC
(1) Ringing signal should
be heard in H-33( )/PT.
TS-352( )/U
FUNCTION switch:
AC volts
LOCAL switch: TEL
(2) Listen for ringing
signal at C-434/GRC.
(2) Bell should ring at
C-434/GRC.
Red test lead in 250
jack on right side of
meter.
BELL-LAMP
switch: BELL
(3) Listen with H-33( )/PT
at C-434/GRC and J654/G .
(3) Ringing signal should
be heard in H-33( )/PT.
(4) Disconnect H-33( )/PT
from right receptacle
of J-654/G and connect
to left receptacle.
Repeat 3 above.
(4) Same as in (3) above.
(5) Turn BELL-LAMP
switch on top of C-434/
GRC to LAMP. Open
dimmer on CALL LIGHT.
(5) TS-352( )/U should
indicate at least 50 volts
AC (0.5 on top AC scale).
CALL LIGHT lamp on
C-434/GRC should light.
Black test lead
3-9
3-9
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
TM 11-5820-489-34/T0 31R4-2GRA
3-10
TEST EQUIPMENT
CONTROL SETTINGS
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
TEST PROCEDURE
PERFORMANCE STANDARD
b. Turn BELL-LAMP
switch at C-434/GRC to
BELL. Connect test
leads CX-1331A/U of
TS-352( )/U between binding posts L1 and L2
of C-434/GRC.
b. None.
c. Crank ringing
generator on C-433/GRC.
Note meter indication
on TS-353( )/U and
perform the following:
c. TS-352( )/U should
indicate at least 45 volts
AC (0.45 on top AC scale).
(1) Listen with H-33( )/PT
at C-433/GRC.
(1) Ringing signal should
be heard in H-33( )/PT.
(2) Listen for ringing
signal of C-433/GRC.
(2) Bell should ring at
C-433/GRC.
(3) Listen with H-33( )/PT
at C-434/GRC.
(3) Ringing signal should
be heard in H-33( )/PT.
(4) Turn BELL-LAMP
switch of C-433/GRC to
LAMP. Open dimmer
control on CALL LIGHT
at top of C-433/GRC.
(4) TS-352( )/U should
indicate at least 50 volts
AC (0.5 on top AC scale).
CALL LIGHT lamp on
C-433/GRC should light.
d. Depress push-to-talk
switch on H-33( )/PT at
C-434/GRC and J-654/G.
Speak into mouthpiece.
d. Local operator’s voice
should be heard at both
C-434/GRC and C-4331GRC.
e. Release push-to-talk
switch on H-33( )/PT.
e. None.
TEST EQUIPMENT
CONTROL SETTINGS
EQUIPMENT
TO BE TESTED
CONTROL SETTINGS
TEST PROCEDURE
PERFORMANCE STANDARD
f. Disconnect H-33( )/PT
from left receptacle of
J-654/G and connect it
to right receptacle.
Repeat d. above.
g. Repeat e. above.
f. Same as d above.
h. Press push-to-talk
switch on H-33( )/PT at
C-433/GRC. Speak into
mouthpiece.
h. Remote operator’s
voice should be heard at
both C-434/GRC and
C-433/GRC.
i. Release push-to-talk
switch on H-33( )/PT
and replace covers on
C-434/GRC and
C-433/GRC.
i. None.
g. None.
TM 11-5820-489-34/T0 31R4-2GR
3-11/(3-12 BLANK)
TM 11-5820-489-34/TO 31R4-2GRA6-42
APPENDIX A
REFERENCES
A-1.
INTRODUCTION
Following is a list of all forms and technical manuals referenced in this manual.
Quality Deficiency Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Form SF 368
Recommended Changes to Equipment Technical Manuals . . . . . . . . . . . . DA Form 2028-2
Recommended Changes to Publications and Blank Form. . . . . . . . . . . . . . . DA Form 2028
A-2. TECHNICAL MANUALS
Direct Support and General Support Maintenance Repair Parts and
Special Tools List (Including Depot Maintenance Repair Parts and Special
Tools): Control Group AN/GRA-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-5820-489-34P
Operator’s Manual: Control Group AN/GRA-6 . . . . . . . . . . . . . . . . . . . . . . . . . TM 11-5820-489-10
Organizational Maintenance Manual: Control Group AN/GRA-6 . . . . . . . . . . TM 11-5820-489-20
Procedures for Destruction of Electronic Materiel to Prevent Enemy Use
(Electronics Command) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TM 750-244-2
A-3. MISCELLANEOUS PUBLICATIONS
The Army Maintenance Management System (TAMMS) . . . . . . . . . . . . . . . DA Pam 738-750
Consolidated Index of Army Publications and Blank Forms . . . . . . . . . . . . DA Pam 310-1
A-1/(A-2
blank)
TM 11-5820-489-34/T0 31R4-2GRA6-42
APPENDIX B
EXPENDABLE SUPPLIES AND MATERIALS LIST
B-1. INTRODUCTION
This appendix lists expendable supplies and materials you will need to operate and maintain
AN/GRA-6. These items are authorized to you by CTA 50-970, Expendable Items.
B-2. EXPLANATION OF COLUMNS
a. ITEM NO. This number is referenced in the narrative instructions to identify the material (for
example, "Use cleaning compound, Item 1, Appx B").
b. LEVEL. Shows the lowest level of maintenance that needs the listed item.
C - Crew/Operator
c. NATIONAL STOCK NUMBER. Shows the National Stock Number assigned to each item and used to requisition that item.
d. DESCRIPTION. Shows the National Item Name and (if required) a short description to identify
and locate the item. The last line for each item shows the Federal Supply Code for Manufacturers
(FSCM) in parentheses, followed by the part number.
e. UNIT OF MEASURE (U/M). Shows the measure of the item needed to perform the actual operational/maintenance function. This measure is shown by a two-letter abbreviation (for example, EA,
OZ, IN).
NATIONAL
STOCK
NUMBER
DESCRIPTION
ITEM
NO.
LEVEL
U/M
1
C
6850-00-105-3084
Trichlorotrifluoroethane
(80244)
QT
2
C
8305-00-267-3015
Cleaning cloth
YD
B-1/(B-2
blank)
TM 11-5820-489-34/T0 31R4-2GRA6-42
INDEX
C
PAGE
Cleaning . . . . . . . . . . . . . . . . . . . . 2-52
Control circuits test . . . . . . . . . 3-2
PAGE
Location, major
components . . . . . . . . . . . . . . 1-1
D
M
Description and data,
equipment . . . . . . . . . . . . . . . 1-1
Destruction of Army
materiel . . . . . . . . . . . . . . . . . . 1-1
Disassembly:
Local Control C-434/GRC:
Batteries . . . . . . . . . . . . . . 2-51
Call light . . . . . . . . . . . . . . . 2-51
Outer case . . . . . . . . . . . . 2-50
Panel . . . . . . . . . . . . . . . . . . 2-52
Remote Control
C-433/GRC:
Batteries . . . . . . . . . . . . . . 2-48
Call light . . . . . . . . . . . . . . . 2-49
Outer case . . . . . . . . . . . . 2-48
Panel . . . . . . . . . . . . . . . . . . 2-49
E
Equipment description and
data . . . . . . . . . . . . . . . . . . . . . . 1-1
Equipment improvement
recommendations . . . . . . . . 1-1
F
Forms, records, and reports
maintenance . . . . . . . . . . . . . 1-1
Functional analysis . . . . . . . . . 1-3
I
Interconnecting box J-654/G:
Short circuit data . . . . . . . . . 2-21
Test . . . . . . . . . . . . . . . . . . . . . . 3-7
Maintenance forms, records
and reports . . . . . . . . . . . . . . . 1-1
Maintenance instructions . . . . . . . 2-48
Major components,
location . . . . . . . . . . . . . . . . . . . . 1-1
N
Nomenclature, names and
designations, official . . . . . . . . . . . 1-1
O
Official nomenclature,
and designations . . .
Operational checks:
Local Control
C-434/GRC . . . . .
Remote Control
C-433/GRC . . . . .
names
. . . . . . 1-1
. . . . . . . 2-24
. . . . . . . 2-22
P
Parts, replacement:
Local Control
C-434/GRC:
Cable compartment
group . . . . . . . . . . . . . . . 2-67
Chassis group . . . . . . . . . 2-67
Panel group . . . . . . . . . . . 2-63
Remote Control
C-433/GRC:
Battery cover group . . . . 2-62
Chassis group . . . . . . . . . 2-58
Panel group . . . . . . . . . . . 2-54
Physical tests and
inspection . . . . . . . . . . . . . . . . 3-2
Index 1
TM 11-5820-489-34/TO 31R4-2GRA6-42
lNDEX-Continued
R
PAGE
Reassembly:
Remote Control
C-433/GRC:
Batteries . . . . . . . . . . . . . . 2-76
Battery compartment
cover . . . . . . . . . . . . . . . 2-76
Call light . . . . . . . . . . . . . . . 2-76
Outer case . . . . . . . . . . . . 2-76
Panel . . . . . . . . . . . . . . . . . . 2-76
Records and forms,
maintenance . . . . . . . . . . . . . 1-1
Repair parts:
Direct support
maintenance . . . . . . . . . . 2-2
General support
maintenance . . . . . . . . . . 3-1
Replacement, parts:
Local Control
C-434/GRC:
Cable compartment
group . . . . . . . . . . . . . . . 2-67
Chassis group . . . . . . . . . 2-67
Panel group . . . . . . . . . . . 2-63
Remote Control
C-433/GRC:
Battery cover group . . . . 2-62
Chassis group . . . . . . . . . 2-58
Panel group . . . . . . . . . . . 2-54
Resistance measurements:
Generator G-25/PT . . . . . . . 2-40
Local Control
C-434/GRC . . . . . . . . . . . . 2-38
Relays 0-1 . . . . . . . . . . . . . . . 2-46
Remote Control
C-433/ARC . . . . . . . . . . . . 2-35
Ringer . . . . . . . . . . . . . . . . . . . 2-44
Transformer T1 . . . . . . . . . . . 2-44
Ringing checks: . . . . . . . . . . . . . 2-44
Local Control
C-434/GRC . . . . . . . . . . . . 2-34
Remote Control
C-433/GRC . . . . . . . . . . . . 2-32
S
Short circuit checks:
Local Control
C-434/GRC . . . . . . . . . . . . 2-17
Remote Control
C-433/GRC . . . . . . . . . . . . 2-15
Special tools, TMDE, and
support equipment
Direct support
maintenance . . . . . . . . . . 2-2
General support
maintenance . . . . . . . . . . 2-1
T
Talking and listening checks:
Local Control
C-434/GRC . . . . . . . . . . . . 2-6
Remote Control
C-433/GRC . . . . . . . . . . . . 2-6
Technical principles of
operation:
Control circuits:
Local Control
C-434/GRC . . . . . . . . . 1-5
Remote Control
C-433/GRC . . . . . . . . . 1-4
Functional analysis . . . . . . . 1-3
Relays 01, 02, 03 . . . . . . . 1-5
Ringing circuit . . . . . . . . . . . . 1-4
Telephone circuit . . . . . . . . . 1-3
Test procedures:
Direct support
maintenance . . . . . . . . . . 2-1
General support
maintenance . . . . . . . . . . 3-1
Tests:
Control circuits . . . . . . . . . . . 3-3
Interconnecting box
J-654/G . . . . . . . . . . . . . . . 3-8
Physical . . . . . . . . . . . . . . . . . . 3-3
Troubleshooting:
Direct support
maintenance . . . . . . . . . . 2-2
General support
maintenance . . . . . . . . . . 3-1
V
Visual inspection . . . . . . . . . . . . 2-52
Voltage measurements:
Generator G-25/PT . . . . . . . 2-31
Local Control
C-434/GRC . . . . . . . . . . . . 2-30
Remote Control
C-433/GRC . . . . . . . . . . . . 2-27
Index 2
*U.S. GOVERNMENT PRINTING OFFICE : 1993 0 - 342-421 (61902)
By Order of the Secretaries of the Army and the Air Force:
Official:
JOHN A WICKHAM, JR.
General, United States Army
Chief of Staff
R. L. DILWORTH
Brigadier General, United States Army
The Adjutant General
Official:
EARL T. O’LOUGHLIN
General, USAF, Commander, Air Force
Logistics Command
LARRY D. WELSH
General, USAF
Chief of Staff
DISTRIBUTION:
To be distributed in accordance with DA Form literature
requirements for AN/GRA-6.
TM 11-5820-489-34/TO 31R4-2GRA6-42
Figure FO-1. Color Code Marking
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-2. CONTROL VOLTAGE POLARITIES AND RELAY CONTACT ARRANGEMENTS
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-3.
CONTROL AN/GRA-6 OPERATION AS FIELD TELEPHONE SET, FUNCTIONAL DIAGRAM.
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-4. CONTROL GROUP AN/GRA-6, REMOTE CONTROL OF SET 2 WITH LOCAL CONTROL OF POWER, FUNCTIONAL DIAGRAM.
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-5. CONTROL GROUP AN/GRA-6, REMOTE CONTROL OF SET 1 WITH REMOTE CONTROL OF POWER, FUNCTIONAL DIAGRAM.
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-6.
REMOTE CONTROL C-433/GRC, SCHEMATIC DIAGRAM
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-7. LOCAL CONTROL C-434/GRC, SCHEMATIC DIAGRAM
TM 11-5820-489-34/TO 31R4-2GRA6-42
FO-8. HANDSET H-33/PT, SCHEMATIC DIAGRAM.
PIN: 060956-000
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