Chec
k
i
f
there is input
a
t C
7
38
C
7
39
Chec
k
i
f
there is output
a
t Pin1
ǃ
Pin
2
Pin3 Pin4 o
f
CN80
7
No
No
Yes
Yes
No sound but h
a
ve picture
Ch
a
n
g
e M
a
inbo
a
rd
S
till h
a
vin
g
p
roble
m
s
Chec
k
i
f
there is
sound input si
g
n
a
l
No
Chec
k
the input source
Yes
Chec
k
i
f
there is input
a
t Pin3
ǃ
Pin1
2
o
f
U
7
05
Chec
k
i
f
there is si
g
n
a
l
a
t L
2
03
a
nd L
2
05
No
chec
k
the si
g
n
a
l input
circuit o
f
L
2
03, L
2
05
Yes
Ch
a
n
g
e U
7
05
No
Chec
k
the
spe
ak
ers
S
ervice M
a
nu
a
l
Model No.:
ǃ
chec
k
the si
g
n
a
l input
circuit o
f
C
7
38, C
7
39
a
nd EC80
7
,EC81
2
No
Yes
Chec
k
i
f
there is +1
2V
a
t Pin15
a
nd Pin
2
8
o
f
U
7
05
Ch
a
n
g
e FB1
Ch
a
n
g
e L
7
0
7
L
7
08
L
7
09 L
7
10
ǃ
ǃ
ǃ
- 40 -
