9A-56
Troubleshooting charts
START
No LO?
Tx Carrier?
VCO OK
Check
R260
TRB =
5V? @U241
Pin 19
U241
Pin 10
>1V?
L253 O/C?
Change
L253
Change
U241
AUX 3
High?
Check U201
Pin 2 for 3.2V
U241 Pin 19
=0V
AUX 4
High?
Change
Q261
VCTRL 0V
or 13V?
L243 Open
Circuit?
Change
U241
Change
L243
Change
U201
Check for faulty parts or dry
joints of L271, L273, C370,
C386, R339 & L309
A
A
No
No
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
Yes
No
No
Yes
Yes
No
No
Check R245 for dry
joint or faulty
No
Troubleshooting Flow Chart for VCO
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 ...