
3-2
3. MUTING CIRCUIT (MUTE)
NO
NO
NO
Does “High” appear
at Q206, Q208 “B”?
YES
Check D205,D204
MUTE
Check R202,R203
Check JK601 pin50
NO
Check the “Low” of
Q206, Q208 “C”
YES
NO
Replace Q206, Q208
Check R635
4. AUDIO ABNORMAL
NO
YES
YES
Check the connection of speakers
NO
Check the “High” of U200 pin7
NO
Check the function input
Check the output of U200 pin1,2,14,15
Check the input signal of U200 pin4,12
Check the DC 12V of U200 pin3,13
YES
NO
Normal
Check the FB302
Check the Power Circuit
YES
NO
Check the IC603 pin81
“HIGH” or “LOW”
YES
Replace IC603
Содержание SB74
Страница 9: ...2 3 2 4 ...
Страница 11: ...2 6 ...
Страница 25: ...3 14 WIRING DIAGRAM JK500 3P 13P CN501 CON2 2P SPK 2P 5P 8P 5P 3P CN580 24P 9P ...
Страница 26: ...3 15 BLOCK DIAGRAM ...
Страница 27: ...3 16 ...
Страница 34: ...PRINTED CIRCUIT BOARD DIARGAMS 1 1 MAIN P C BOARD DIAGRAM TOP VIEW 3 29 3 30 ...
Страница 35: ...1 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW 3 31 3 32 ...
Страница 37: ...3 1 MCU9800 P C BOARD DIAGRAM TOP VIEW 3 35 3 36 ...
Страница 38: ...3 2 MCU9800 P C BOARD DIAGRAM BOTTOM VIEW 3 37 3 38 ...
Страница 39: ...4 FRONT P C BOARD DIAGRAM 5 CD JACK P C BOARD DIAGRAM 3 39 3 40 ...