
3-2
Low Band TROUBLESHOOTING CHARTS
2.0
Troubleshooting Flow Chart for Receiver
(Sheet 1 of 2)
Check
circuitry
around U1103.
Replace U1103
if defect.
Check circuitry
around U1103.
Replace U1103
if defect.
Audio
at pin 8 of
U1103
?
Audio
heard
?
Check
voltages on
U1103.
OK?
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Check Controller (in the case of no audio).
Or else go to “B”
Yes
No
Spray or inject 10.7MHz
into XTAL Filter FL1102.
B
Yes
No
Check 2nd LO
(10.245MHz) at C1129.
LO
present
B
Yes
Biasing
OK
No
No
A
Yes
Check Q1106 bias
for faults.
Replace Q1106.
Go to B
Yes
No
Check circuitry around Y1101.
Replace Y1101 if defect.
Содержание 6864115B62-C
Страница 1: ...Professional Radio GM Series Detailed Service Manual 6864115B62 C ...
Страница 2: ...ii ...
Страница 4: ...iv ...
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 ...