
3-2
TROUBLESHOOTING CHARTS
1.1
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
IF Signal at
C3035?
No
RF Signal at
T3001?
RF Signal at
C3012?
No
RF Signal at
C3008?
No
RF Signal at
C3474?
No or
Check Harmonic Filter
J3401 and
Antenna Switch
D3471,D3472,L3472
Check filter between C3474
& C3008. Check tuning
voltage at R3019
Inject RF into J3401
Is tuning
voltage OK?
No
Yes
Check RF amp
(Q3001) Stage
Check filter between
C3012 & T3001
Yes
Check T3001, T3002,
D3031, R3030-R3034,
L3032, C3034 and C3035
Yes
1st
LO level OK?
Locked?
Yes
Check FGU
Yes
Trace IF signal from
C3035 to Q3101.
Check for bad XTAL
filter
No
Yes
IF signal at Q3102
collector?
Before replacing
U3101, check
U3101 voltages
Yes
Check for 5VDC
Is 9V3 present?
Check Supply Voltage
circuitry. Check Q0681,
U3211 and U0641
No
No
No
Check U3501
Check varactor filter
No
Yes
Yes
Yes
A
A
B
weak RF
Содержание 6864115B62-C
Страница 1: ...Professional Radio GM Series Detailed Service Manual 6864115B62 C ...
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Страница 5: ...Professional Radio GM Series Service Maintainability Issue July 2007 ...
Страница 8: ...ii ...
Страница 22: ...2 10 MAINTENANCE ...
Страница 25: ...Professional Radio GM Series Controlhead Service Information Issue July 2007 ...
Страница 77: ...Professional Radio GM Series Controller Service Information Issue May 2007 ...
Страница 100: ...2 2 TROUBLESHOOTING CHARTS ...
Страница 104: ...3 4 Controller schematics parts list ...
Страница 154: ...3 52 Controller T12 Schematic Diagrams ...
Страница 155: ...Professional Radio GM Series VHF 136 174MHz Service Information Issue May 2007 ...
Страница 164: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Страница 176: ...2 12 THEORY OF OPERATION ...
Страница 186: ...3 10 TROUBLESHOOTING CHARTS ...
Страница 190: ...4 4 VHF PCB SCHEMATICS PARTS LISTS ...
Страница 252: ...4 66 VHF 1 25W PCB 8471235L02 Schematics VHF 136 174 MHz IF ...
Страница 256: ...4 70 VHF 1 25W PCB 8471235L02 Schematics ...
Страница 257: ...Professional Radio GM Series UHF 403 470MHz Service Information Issue May 2007 ...
Страница 266: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Страница 349: ...Professional Radio GM Series LB1 29 6 36 0MHz LB2 36 0 42 0MHz LB3 42 0 50 0MHz Service Information Issue May 2007 ...
Страница 366: ...2 12 THEORY OF OPERATION ...
Страница 372: ...3 6 Low Band TROUBLESHOOTING CHARTS ...
Страница 376: ...4 4 Low band pcb schematics parts lists ...