Pioneer VSX-523-K Service Manual page 18

1
A
No Sound
This is just for general reference and does not including every single case.
No Sound
Phones
When connected phones,
does the relay change to phones?
(CPU Assy IC203 pin 24 0 → 3.3 V)
B
Yes
Is the voltage 0 to 12 V?
(CPU Assy R105)
Yes
Does the sound of speaker
front ch output?
C
Yes
Does HP OUTPUT signal
output?
(CPU Assy CN206 pin 1 or 3)
Yes
Replace HPMIC Assy.
Speaker front ch sound
D
Set "STEREO" mode with STANDARD
SURROUND key and speaker ON/OFF
with SPEAKERS key.
Is pin 18 voltage changing
from 3.3 V to 2.23 V?
(CPU Assy CP704B pin 18)
Yes
Is the voltage 0 to 3.2 V?
(CPU Assy CN208 pin 6)
Yes
E
Is the voltage 0 to 12 V?
(MAIN Assy R20)
Yes
Analog in (e.g. CD)
Pure Direct →
Speaker out sound
Yes
F
A B
18
1
2
When connected phones,
No
is CN206 pin 4 (HP_DET)
low?
Yes
Check connectors between FRONT
Assy CN106 and HPMIC Assy CP104.
No
Replacce Q102, Q103, R105 on
CPU Assy or replace CPU Assy.
No
No
Check connecters between CPU Assy
CN206 and FRONT Assy CN106.
Is the voltage changing
No
3.3 V to 2.23 V?
(FRONT Assy CN704A pin 18)
Yes
Replace FFC between CP704B
and CN704A.
No
Replace CPU Assy.
No
Replacce Q2, Q9 on MAIN Assy
or replace MAIN Assy.
No
Are the signal on AMP5
Assy CP401 pin 1, 9?
Yes
Check and repair FL or FR AMP
circuit or replace AMP5 Assy.
VSX-523-K
2
3
No
Replace HPMIC Assy.
No Problem / No Damage
Replace HPMIC Assy.
No Problem / No Damage
Replace CPU Assy.
Relay Control Check flow
No
Check IC701 on FRONT Assy
or replace FRONT Assy.
Change analog input signal to
another analog input (e.g VIDEO)
No
and select it.
Are the signal on AMP5 Assy
CP401 pin 1, 9?
Yes
Check the problem analog signal
line between input connector and
IC400 (Input selector IC)
or replace MAIN Assy.
3
4
No
C
4