22
A-A9MK2-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5. DIAGNOSIS
5.1 TROUBLESHOOTING
FUSE F
8
01 is blown.
Check whether D
8
09, D
8
10, D
8
13, D
8
14, D
8
19, D
8
20, D
8
21 or
D
8
22 is damaged.
LCD BACK LIGHTI
N
G is not lit.
Check w5
V
is output at OUT PUT of IC
8
04 REG IC.
Check the voltage drop at resistor R
8
52 22
Ω
.
Check the voltage drops at resistors R
8
21, R
8
22 0.22
Ω
.
MICOM is not functioning.
Check w6
V
is output at OUT PUT of IC
8
09.
Check whether XTAL101 is oscillating properly.
Check whether RESET IC of IC511 is functioning properly.
W
hen SPEAKER PROTECTIO
N
is
Check whether PO
W
ER 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.
ELECTRO
N
IC
V
OLUME is not functioning.
Check w
8V
is output at OUT PUT of IC112, and
whether
-
8V
is output at OUT PUT of IC111.
Check whether data is input to PI
N
42, 43 of IC101.
W
hen there is no sound
Check the operation status of Q111, Q112 MUTE TR.
HEAT SI
N
K is overheated.
Check whether IDLE is adjusted at 52mv+/-10m
V
without load.
N
POWER ASSY
A
FUNCTION ASSY
A
FUNCTION ASSY
J
AMP R CH ASSY
I
AMP L CH ASSY
J
AMP R CH ASSY
I
AMP L CH ASSY
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