18
VSX-523-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
A
B
C
N
o Sound
Phones
W
hen connected phones,
is C
N
206 pin 4 (HP_DET)
low?
Is the voltage 0 to 12
V
?
(CPU Assy R105)
Does the sound of speaker
front ch output?
Set "STEREO" mode with STA
N
DARD
SURROU
N
D key and speaker O
N
/OFF
with SPEAKERS key.
Is pin 1
8
voltage changing
from 3.3
V
to 2.23
V
?
(CPU Assy CP704B pin 1
8
)
Change analog input signal to
another analog input (e.g
V
IDEO)
and select it.
Are the signal on AMP5 Assy
CP401 pin 1, 9?
Does HP OUTPUT signal
output?
(CPU Assy C
N
206 pin 1 or 3)
W
hen connected phones,
does the relay change to phones?
(CPU Assy IC203 pin 24 0
→
3.3
V
)
This is just for general reference and does not including every single case.
Speaker front ch sound
Relay Control Check flow
N
o
N
o
N
o
Replace HPMIC Assy.
Replace HPMIC Assy.
N
o Problem /
N
o Damage
Replace HPMIC Assy.
Replacce Q102, Q103, R105 on
CPU Assy or replace CPU Assy.
Check IC701 on FRO
N
T Assy
or replace FRO
N
T Assy.
N
o
N
o
N
o
N
o
Replacce Q2, Q9 on MAI
N
Assy
or replace MAI
N
Assy.
Check and repair FL or FR AMP
circuit or replace AMP5 Assy.
N
o
Replace CPU Assy.
N
o
N
o
N
o
N
o
Check connectors between FRO
N
T
Assy C
N
106 and HPMIC Assy CP104.
Replace CPU Assy.
N
o Problem /
N
o Damage
Check connecters between CPU Assy
C
N
206 and FRO
N
T Assy C
N
106.
Yes
Yes
Yes
Yes
Yes
Yes
Replace FFC between CP704B
and C
N
704A.
Yes
Check the problem analog signal
line between input connector and
IC400 (Input selector IC)
or replace MAI
N
Assy.
Yes
Yes
Yes
Yes
Yes
No Sound
Is the voltage changing
3.3
V
to 2.23
V
?
(FRO
N
T Assy C
N
704A pin 1
8
)
Is the voltage 0 to 3.2
V
?
(CPU Assy C
N
20
8
pin 6)
Is the voltage 0 to 12
V
?
(MAI
N
Assy R20)
Analog in (e.g. CD)
Pure Direct
→
Speaker out sound
Are the signal on AMP5
Assy CP401 pin 1, 9?
jomi
