Troubleshooting Flow Chart for 40 W Transmitter (Sheet 1 of 3)
3-5
2.1
Troubleshooting Flow Chart for 40 W Transmitter (Sheet 2 of 3)
No
Yes
Yes
No
Check bias tuning
before replacing
U504
Check PA
Stages
No or too low power when keyed
DC
Voltage
at Q101 & Q102
base=0?
DC
Voltage
at U103
Pin 8
Check U510
Check resistive network at
Pin 9 and 10 of U103
before replacing U101
Measure DC Voltage at Pin 2 & 3 of U5401
Pin 2
Voltage
0.62 x Voltage
at Pin 1
Replace U5410
Pin 3
Voltage
0.51 x Voltage
at Pin 1
Replace U5410
DC
Voltage at
PA_CURRENT
line?
Replace Q105
Check Final PA Stages
ASFIC
U504
Pin 5 2-3V
Check components be-
tween ASFIC and Q105
before replacing Q105
DC
Voltage at
U103 Pin
10=8.9V
Check Q102,
Q101, R122, R165
Check U103 and Resistive
Network at Pin 10 of U103
before replacing U101
No
No
Yes
>5V
2 to 5V
Yes
Supply Voltage
2-3V
Yes
No
0V
<2V
Summary of Contents for cm200 Commercial Series
Page 1: ......
Page 2: ......
Page 3: ...M CM200 CM300 PM400 Radios Detailed Service Manual 6881098C00 A ...
Page 6: ...THIS PAGE INTENTIONALLY LEFT BLANK Notes ...
Page 7: ...CM200 CM300 PM400 Radios Service Maintainability Issue November 2007 M ...
Page 10: ...iv Notes ...
Page 12: ...vi Notes ...
Page 16: ...1 4 INTRODUCTION Notes ...
Page 24: ...2 8 MAINTENANCE Notes ...
Page 27: ...CM200 CM300 PM400 Radios Control Head Service Information Issue November 2007 M ...
Page 32: ...1 2 OVERVIEW Notes ...
Page 46: ...4 2 CONTROLHEAD PCB SCHEMATICS PARTS LISTS Notes ...
Page 53: ...CM200 CM300 PM400 Radios UHF2 438 470 MHz 1 25 W Service Information Issue November 2007 M ...
Page 58: ...vi Notes ...
Page 62: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 96: ...4 2 UHF2 PCB SCHEMATICS PARTS LISTS Notes ...
Page 151: ...CM200 CM300 PM400 Radios UHF2 438 470 MHz 25 40 W Service Information Issue November 2007 M ...
Page 156: ...vi Notes ...
Page 160: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 194: ...4 2 UHF2 PCB SCHEMATICS PARTS LISTS Notes ...
Page 222: ...4 30 UHF 25 40 W Band 2 PCB 8486577Z01 Schematics Notes ...
Page 250: ...4 58 UHF 25 40 W Band 2 PCB 8486577Z03 Schematics Notes ...
Page 251: ...CM200 CM300 PM400 Radios UHF3 465 495 MHz 25 40 W Service Information Issue November 2007 M ...
Page 256: ...vi Notes ...
Page 260: ...1 4 MODEL CHART AND TECHNICAL SPECIFICATIONS Notes ...
Page 294: ...4 2 UHF3 PCB SCHEMATICS PARTS LISTS Notes ...
Page 322: ...4 30 UHF 25 40 W Band 3 PCB 8486577Z01 Schematics Notes ...
Page 350: ...4 58 UHF 25 40 W Band 3 PCB 8486577Z03 Schematics Notes ...
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