3-7
No sound
Connect CN700.
Replace IC500.
Replace Speaker unit.
OK
1) Check the soldering JK300.
2) Replace portable cable.
OK
Replace IC902.
Check connection of CN700.
Check if signal comes out
from IC500. (check pin 63 ~ 66)
Check speaker unit.
No sound in portable mode?
Check if signal enters IC500.
(check pin2, 7)
Does 5 V or 9 V flow IC700.
(check pin12 ~ 14)?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
2. AMP (PORTABLE MODE)
ELECTRICAL TROUBLESHOOTING GUIDE
Содержание NP5550B
Страница 12: ...2 5 Figure 3 4 Assemble the rear screw 2 EA using a phillips screwdriver ...
Страница 13: ...2 6 ...
Страница 35: ...3 30 3 29 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...
Страница 37: ...3 34 3 33 ...