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TROUBLESHOOTING GUIDES.
Up
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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Section III. VEHICULAR RADIOS


TM 115820890203
TROUBLESHOOTING GUIDES. Continued
2.2.
TS Guide 3. LOSS OF SIDETONE
ACTIONS
CHECKS
STEPS
Replace manpack antenna *
N/A
N/A
3.1
Press PTT and count into HS **
Sidetone heard?
YES: Go to 3.2
NO:
Go to 3.3
N/A
N/A
3.2 Remove antenna
N/A
N/A
Install original antenna base
N/A
N/A
Install new antenna element
on base
Press PTT and count into HS
Sidetone heard?
YES: Replaced antenna
elements are bad
NO:
Replace antenna base
Silver-colored?
YES: Go to 3.4
Note color of RT ANT J1
3.3
Replace RT
NO:
I
3.4
AS-4266
Note type of antenna used
NO:
Go to 3.5
antenna used?
YES: Replace RT
N/A
N/A
Remove antenna
3.5
N/A
N/A
Set RT FCTN to LD
N/A
N/A
Place red probe on center
conductor of RT ANT J1 ***
N/A
N/A
Place black probe on outside
of RT ANT J1
5.0 to 6.5 Ohms?
Read DMM
YES: Replace RT
NO:
Replace RT ANT J1
*
Replace antenna with same model as antenna removed.
** Use the same frequency where loss of sidetone occurred.
*** DO NOT depress center connector.
TS Guide 4. RADIO WILL NOT OPERATE WITH DATA DEVICES
STEPS
CHECKS
ACTIONS
4.1
Run Op Check on RT
Op Check
NO:
Go to 4.2
failed?
YES: Replace RT
4.2
Run Self-Test/Op Check on
Self-Test/Op
NO:
Go to 4.3
data device
Check failed?
YES: Replace data device
4.3
Test interface cable for
Cable open or
NO:
Go to 4.4
opens and shorts
shorted?
YES: Replace cable
I
4.4
Replace data device with known
N/A
N/A
good data device *
Operate system**
System
YES: Replaced data device
operates?
is bad
Replace RT
NO:
* If a data device is not available, replace the RT. If the system then operates, the replaced RT is bad.
** Skip this step if the tactical situation or your unit SOP precludes transmitting.
26


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