9A-52
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
LVZIF_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 GP88s
Страница 1: ...November 2003 GP88s Portable Radio Service Manual 6804111J47 D ...
Страница 4: ...iv Document History THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 16: ...xvi 4 0 Parts List for Speaker Mic Assembly 0104008J99 10 2 Glossary of Terms G 1 ...
Страница 28: ...3 6 Programming Test Cable THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 52: ...5 6 Test Mode THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 56: ...6 4 Cloning Information THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 60: ...7 4 Controller Board THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 180: ...9B 48 Circuit Board Schematic Diagrams and Parts List THIS PAGE INTENTIONALLY LEFT BLANK ...