65
AVR-3310CI/AVR-3310/AVR990/AVC-3310
4. Power AMP (8U-110062, 8U-110063)
No sound is output
The protector operates.
YES
Is the power transistor open or short circuit?
DHCT A3/C3
YES
Replace the power transistor.
NO
Is the emitter resistance of the power
transistor open?
0.22Ω
YES
Replace the emitter resistance.
NO
Is the base resistance of the power
transistor open?
220Ω
YES
Replace the base resistance.
NO
Is trimmer potentiometer between the base
of the power transistor open?
300Ω
YES
Replace the trimmer potentiometers.
NO
Is the zener diode and diode which are
connected with the base of a power
transistor short-circuited?
HZS6A-1
1SS133
YES
Replace the Zener diode and the
diode.
NO
Is other transistor trouble?
YES
Replace the transistor.
NO
Is other resistance trouble?
YES
Replace the resistance.
Turn on power, check that voltage of the section is normal and that idling electric current is
flowing.
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Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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