
Chapter 3
LOW BAND TROUBLESHOOTING CHARTS
1.0
Troubleshooting Flow Chart for Transmitter
No
DC
@ Gate of
Q1401
Voltage
?
No
Yes
START
No or Low
TX
DC
@Drains of
Q1402 &
Q1403
Voltage
?
@ Cathode of
D1401 &
D1402
DC
Voltage
?
Drains of Q1402 &
AC
Q1403 both sine or
both distorted
Voltages @
?
Check 9T1 and
Diode Bias Circuit
Verify RF Continuity
to gates of
Q1402 & Q1403
Check circuitry
between Q1402 &
Q1403 and
Antenna Port
Check
MOSBIAS_1
Supply and
Feed Network
No
<<18V pp
Yes
No
Yes
< 1A
No
Check
Q1401
Device
Yes
CURRENT
RF @
Junction
R1413 &
DC
@ TP1402 &
TP1403
Yes
Check
MOSBIAS_2
MOSBIAS_3
and Feed Networks
Check DC/AC
Gate Circuits of
Q1402 & Q1403
Check Supply Feed
and/or PowerControl
Circuits.
No
>18V pp
Check
U1401
Device
AC
@ Gate of
Q1401
Voltage
?
Yes
DC
@ U1401
Voltage
?
Yes
No
Power Out
> 1A
Look for
short on
Supply Line
R1414
Voltage
?
TX
Safety
Switch
Check Pressure Pad
and/or
Switch Circuitry
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 ...