Getting rid of audio's trouble
audio-part
（
no sound
）
10
MANI
BOARD
FAULT
JUDGMENT
Setting of Volume
、
MUTE is normal
It have the audio signal utput?
No audio
CN32 or CN22supply power normally?
CN20 port have the audio signal?
M
ain
te
na
nc
e i
ts
p
ow
er
s
up
ply
c
irc
uit
M
ain
te
na
nc
e P
eri
ph
era
l a
ud
io
e
qu
ip
m
en
t
The PIN8 of U32 >8.5 V ?
Or the PIN6 U22>3V?
The PIN1 and 9 of U32 have the input
？
or U22 PIN4 and 12 of U22 have the input
？
The pin 1 and 7of U13 have signal output ?
Amp outputs have
signal
or not
R
es
eti
ng
a
ga
in
C
he
ck
th
e s
pe
ak
er
pa
rk
.
M
ain
te
na
nc
e
th
e
re
la
tiv
e
c
om
po
ne
nt
of
th
is
pin
A
nd
n
etw
ork
U
22
o
r U
32
h
av
e d
am
ag
ed
M
ain
te
na
nc
e
(
co
rre
lati
ve
org
an
&
ne
tw
ork
of
pla
yin
g
an
d
inp
ut
)
C
he
ck
U
13
o
utp
ut
to
U
22
o
r c
on
ne
cte
d p
art
The PIN2 and PIN6 of U13
have signal unput ?
M
ain
te
na
nc
e
U
13
an
d r
ela
te
d p
art
n
et
M
ain
te
na
nc
e t
he
m
ain
bo
ard
a
nd
R
26
6
，
R
26
0
N
Y
N
Y
Y
N
N
Y
N
Y
Y
N
N
Y
N
Y
Y
N
