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Page Title:
TS Guide 16. RT-B: LESS THAN 30W FWD PWR OUT OF PA FROM 30-40 MHZ |
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|  TM 115820890-20-3
TROUBLESHOOTING GUIDES. Continued
3.2.
TS Guide 16. RTB: LESS THAN 30W FWD PWR OUT OF PA FROM 3040
MHZ
STEPS
CHECKS
ACTIONS
16.1 Start veh engine
N/A
N/A
NO:
Measure FWD PWR
FWD PWR
Go to 16.2
greater than
YES: Problem is with
30 W?
vehicle power
16.2 Remove CG-3856 from RT
N/A
N/A
N/A
Remove PA
N/A
N/A
N/A
Connect test set cable from
RT ANT to test set RADIO
N/A
Press PTT
N/A
Measure voltage at PA Mount J4,
NO:
67 Vdc?
Go to 16.3
Pin N to Pin A (GND)
YES:
GO to 16.6
6.3 Remove CX-13291 from PA Mount J3
N/A
N/A
N/A
N/A
Press PTT
Measure voltage at CX-13291 P1,
NO:
67 Vdc?
Go to 16.4
Pin N to Pin A (GND)
YES: Replace PA Mount
16.4 Remove VAA from MB
N/A
N/A
NO:
Check continuity at VAA
Open?
Go to 16.5
J11, Pin N to J7, Pin H
YES: Replace VAA
16.5 Remove CX-13291 from VAA J11
N/A
N/A
Check continuity at CX-13291
Open?
YES: Replace CX-13291
P1, Pin N to P2, Pin N
NO:
Replace RT
16.6 Press PTT
N/A
N/A
Measure voltage at PA Mount J4,
NO:
67 Vdc?
Go to 16.7
Pin P to Pin A (GND)
YES: Go to 16.10
6.7 Remove CX-13291 from PA Mount J3
N/A
N/A
Press PTT
N/A
N/A
NO:
Measure voltage at cable,
67 Vdc?
Go to 16.8
Pin P to Pin A (GND)
YES: Replace PA Mount
16.8 Remove VAA from MB
N/A
N/A
Check continuity at VAA
Open?
NO:
Go to 16.9
J11, Pin P to J7, Pin M
YES: Replace VAA
16.9 Remove CX-13291 from VAA J11
N/A
N/A
Check continuity at CX-13291
Open?
YES: Replace CX-13291
P1, Pin P to P2, Pin P
NO:
Replace RT
16.10 Measure voltages at PA Mount J4:
All voltages
YES: Replace PA
Pin B
6.556.95 Vdc
NO:
correct?
Replace PA Mount
Pin C
12.5 13.5 Vdc
Pin D
22.032.0 Vdc
*
Pin F
180220 Vdc
WARNING:
VAA J1 and PA MOUNT J4 have 200 VDC on Pin F.
Use extreme caution in measuring voltage.
320
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