4-7
Distorted audio and loud noise
No
Yes
No
Yes
Yes
No
No
Distorted audio and
loud noise
Replace R369,R375
Check Q544
Replace Q361,Q362
Check whether the muting resistance
R369,R375 are normal
Yes
Check whether the muting
transistor Q361,Q362 are
normal
Checking the U361 leads
the feet has no to break to
open
Correct connection
Replace R362,R363
Check the voltage on
pin3 or pin5 of U361 is
OK.
(
Should be 2.5~3.1V
)
Check whether the U1 or
U361 powersupply normal
No
Yes
Check the power supply voltages
M5V to the operation amplifying
Q544 is normal.
Yes
Check U361
Replace U1 or U361
No
Yes
Trouble shooting chart