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Step 4. LOAD CHECKS
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TM-11-5820-890-20-3 Ground ICOM Radio Sets AN/PRC-119A AN/VRC-87A AN/VRC-88A AN/VRC-89A AN/VRC-90A AN/VRC-91A AN/VRC-92A Manual
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TYPICAL SC TEST SETUP


TM 11-5820-890-20-3
3.1.
OPERATIONAL CHECK. Continued
Step 5. TRANSMITTER CHECKS *
ACTIONS
CHECKS
STEPS
N/A
N/A
5.1 Remove RF cable from RT ANT
N/A
N/A
Connect test set cable from
test set RADIO to RT ANT.
N/A (See following SC
N/A
Connect vehicular antenna
Test Setup diagram.)
cable to test set ANT
Set test set:
N/A
N/A
MODE to FWD PWR
Set RT:
N/A
N/A
FCTN to SQ ON
N/A
N/A
CHAN to 1
N/A
N/A
MODE to SC
N/A
N/A
COMSEC to CT
YES: Go to Step 5.3
Test set FWD PWR reads
5.2 Press PTT and PTTest
2­6 W?
NO:
Go to TS Guide 12
YES: Go to Step 5.4
5.3 Set test set MODE to RVS PWR Test set reads no more
NO:
Go to TS Guide 12
than l/3** of FWD PWR?
Press PTT and PTTest
RT SIG display reads
YES: Go to Step 5.5
5.4 Press PTT
Replace RT
NO:
4 or more?
YES: Go to Step 5.6
Test set reads no more
5.5 Set RT CHAN to 2
NO:
Go to TS Guide 12
Repeat Steps 5.2 & 5.3
than l/3** of FWD PWR?
YES: Go to Step 5.7
Test set reads no more
5.6 Set RT CHAN to 3
NO:
Go to TS Guide 12
Repeat Steps 5.2 & 5.3
than l/3** of FWD PWR?
YES: Go to Step 5.8
5.7 Set RT CHAN to 1
Sidetone heard?
NO:
Got to TS Guide
Press PTT, count into HS
13
YES: Go to Step 5.9
Test set reads
5.8 Set test set MODE to FREQ
Press PTT and PTTest
40998 ­ 41002?
NO:
Replace RT
5.9 Set RT CHAN to 2
Test set reads:
YES: Go to Step 5.10
NO:
Replace RT
Press PTT and PTTest
53998 ­ 54002?
Test set reads:
YES: Go to Step 5.11
5.10 Set RT CHAN to 3
Press PTT and PTTest
74998 ­ 75002?
NO:
Replace RT
5.11 Set RT FCTN to RXMT
N/A
Connect HS to RT RXMT
N/A
Listen at HS
Rushing noise heard
YES: Go to Step 5.12
at HS?
NO:
Replace RT
I
YES: Go to STEP 6
5.12 Press PTT
SIG display reads
4 or more?
NO:
Replace RT
* Skip this step if the tactical situation or your unit SOP precludes transmitting. If unit SOP or tac­
tical situation prohibits transmitting, use dummy load and realize that antenna cannot be checked.
** If radio is used for data transmission, use 1/4 rather than 1/3 for these checks.
3­5


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