
6A-40
Troubleshooting charts
Bad SINAD
Bad 20dB Quieting
No Recovered Audio
START
Audio at pin
27 of U301?
Check Controller
Yes
No
Spray of inject 1st IF into
XTAL Filter
IF Freq: 45.1MHz
Audio heard?
B
Yes
No
Check 2nd LO Control
Voltage at C363
VCO locked?
B
Yes
16.8 MHz
check at pin
22 U301?
Activity on
U301 sel pin?
Check FGU
No
No
A
A
Yes
Check Q320 bias
circuitry for faults.
Rotate Freq. Knob
Check controller.
Before replacing U301, check 2nd
VCO Q320. Check VCO O/P level,
C351, C352.
Yes
No
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
Содержание GP328
Страница 1: ...GP328 GP338 Portable Radios Detailed Service Manual 6804110J64 F June 2002 ...
Страница 4: ......
Страница 8: ...iv ...
Страница 16: ...xii ...
Страница 20: ...2 2 Recommended Test Tools ...
Страница 22: ...3 2 Error Codes ...
Страница 60: ...5 4 Parts List Keypad Basic ...
Страница 76: ...6A 14 Notes For All Schematics and Circuit Boards ...
Страница 120: ...6B 14 Notes For All Schematics and Circuit Boards ...
Страница 230: ...6D 36 Circuit Board Schematic Diagrams and Parts List ...
Страница 248: ...6E 12 Notes For All Schematics and Circuit Boards ...
Страница 270: ...7 4 Parts List for Universal Connector Flex ...