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7. GENERAL INFORMATION
7.1 TROUBLE SHOOTIG
FUSE F801 is blown.
Check whether D809, D810, D813 or D814 is damaged.
LCD BACK LIGHTING is not lit.
Check w5V is output at OUT PUT of IC804 REG IC.
Check the voltage drop at resistor R852 22
Ω
.
Check the voltage drops at resistors R821, R822 0.22
Ω
.
MICOM is not functioning.
Check w6V is output at OUT PUT of IC809.
Check whether XTAL101 is oscillating properly.
Check whether RESET IC of IC511 is functioning properly.
When SPEAKER PROTECTION is
Check whether POWER TR is functioning properly.
engaged
Check whether R730, R729 0.22
Ω
of L-CH and R774,
R755 0.22
Ω
of R-CH are damaged.
Check w power supply and - power supply are supplied.
ELECTRONIC VOLUME is not functioning.
Check w8V is output at OUT PUT of IC112, and
whether -8V is output at OUT PUT of IC111.
Check whether data is input at PIN42, 43 of IC101.
When there is no sound
Check the operation status of Q111, Q112 MUTE TR.
Check whether IDLE is adjusted at 52mv+/-10mV without load.
MOTOR VOLUME is not functioning.
Check w9V is output at OUT PUT of IC807.
Check whether MOTOR DRIVE IC of IC650 is functioning
properly.
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QQ 376315150
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TEL 13942296513
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
