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5
7. GENERAL INFORMATION
7.1 TROUBLE SHOOTIG
FUSE F801 is blown.
LCD BACK LIGHTING is not lit.
MICOM is not functioning.
When SPEAKER PROTECTION is
engaged
ELECTRONIC VOLUME is not functioning.
When there is no sound
HEAT SINK is overheated.
MOTOR VOLUME is not functioning.
5
6
Check whether D809, D810, D813 or D814 is damaged.
Check whether +5V is output at OUT PUT of IC804 REG IC.
Check the voltage drop at resistor R852 22Ω.
Check the voltage drops at resistors R821, R822 0.22Ω.
Check whether +6V is output at OUT PUT of IC809.
Check whether XTAL101 is oscillating properly.
Check whether RESET IC of IC511 is functioning properly.
Check whether POWER TR is functioning properly.
Check whether R730, R729
R755
0.22Ω
of R-CH are damaged.
Check whether + power supply and - power supply are supplied.
Check whether +8V 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.
Check the operation status of Q111, Q112 MUTE TR.
Check whether IDLE is adjusted at 52mv+/-10mV without load.
Check whether +9V is output at OUT PUT of IC807.
Check whether MOTOR DRIVE IC of IC650 is functioning
properly.
A-A9-J
6
7
0.22Ω
of L-CH and R774,
7
8
A
B
C
D
E
F
55
8
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