
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
Summary of Contents for 6864115B62-C
Page 1: ...Professional Radio GM Series Detailed Service Manual 6864115B62 C ...
Page 2: ...ii ...
Page 4: ...iv ...
Page 5: ...Professional Radio GM Series Service Maintainability Issue July 2007 ...
Page 8: ...ii ...
Page 22: ...2 10 MAINTENANCE ...
Page 25: ...Professional Radio GM Series Controlhead Service Information Issue July 2007 ...
Page 77: ...Professional Radio GM Series Controller Service Information Issue May 2007 ...
Page 100: ...2 2 TROUBLESHOOTING CHARTS ...
Page 104: ...3 4 Controller schematics parts list ...
Page 154: ...3 52 Controller T12 Schematic Diagrams ...
Page 155: ...Professional Radio GM Series VHF 136 174MHz Service Information Issue May 2007 ...
Page 164: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 176: ...2 12 THEORY OF OPERATION ...
Page 186: ...3 10 TROUBLESHOOTING CHARTS ...
Page 190: ...4 4 VHF PCB SCHEMATICS PARTS LISTS ...
Page 252: ...4 66 VHF 1 25W PCB 8471235L02 Schematics VHF 136 174 MHz IF ...
Page 256: ...4 70 VHF 1 25W PCB 8471235L02 Schematics ...
Page 257: ...Professional Radio GM Series UHF 403 470MHz Service Information Issue May 2007 ...
Page 266: ...1 6 MODEL CHART AND TECHNICAL SPECIFICATIONS ...
Page 366: ...2 12 THEORY OF OPERATION ...
Page 372: ...3 6 Low Band TROUBLESHOOTING CHARTS ...