Pioneer HTP-072 Service Manual page 20

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)
Yes
B
Is the voltage 0 to 12 V?
(HTP-072: MAIN Assy R23)
(VSX-323: MAIN Assy R32)
Yes
Does the sound of speaker
front ch output?
Yes
C
Does HP OUTPUT signal output?
(HTP-072: MAIN Assy CP5 pin 2 or 4)
(VSX-323: MAIN Assy CP101 pin 2 or 4)
Yes
Replace HP Assy.
Speaker front ch sound
Set "STEREO" mode with STANDARD
D
SURROUND key and speaker ON/OFF
with SPEAKERS key.
Is pin 18 voltage changing
from 3.3 V to 2.23 V?
(FRONT Assy CP705 pin 6)
Yes
Is the voltage 0 to 3.2 V?
(CPU Assy CP2 pin 7)
Yes
Is the voltage 0 to 12 V?
E
(MAIN Assy R20)
Yes
Analog in (e.g. CD)
Pure Direct →
Speaker out sound
Yes
F
A B
20
1
2
HTP-072: When connected phones, is
No MAIN Assy CP5 pin 1 (HP_DET) low?
VSX-323: When connected phones, is
MAIN Assy CP101 pin 1 (HP_DET) low?
Yes
HTP-072: Check connectors between MAIN Assy
CP5 and HP Assy CN721.
VSX-323: Check connectors between MAIN Assy
CP101 and HP Assy CN721.
No
Replacce Q5, Q12, R23 on
CPU Assy or replace CPU Assy.
No
No Problem / No Damage
HTP-072: Check connecters between
No
MAIN Assy CP5 and HP Assy CN721.
VSX-323: Check connecters between
MAIN Assy CP101 and HP Assy CN721.
Is the voltage changing
No
3.3 V to 2.23 V?
(CPU Assy CN704B pin 6)
Yes
Replace FFC between CP704B
and CN705.
No
Replace CPU Assy.
No
Replacce Q2, Q9 on MAIN Assy
or replace MAIN Assy.
HTP-072: Are the signal on AMP6
No
Assy CP401 pin 1, 9?
VSX-323: Are the signal on AMP5
Assy CP201 pin 1, 9?
Yes
Check and repair FL or FR AMP
circuit or replace AMP Assy.
HTP-072
2
3
No
Replace HP Assy.
No Problem / No Damage
Replace HP Assy.
Replace MAIN Assy.
Relay Control Check flow
No
Check IC2023 on CPU Assy
or replace CPU Assy.
HTP-072: Change analog input signal to another
analog input (e.g VIDEO) and select it.
No
Are the signal on AMP6 Assy CP401 pin 1, 9?
VSX-323: Change analog input signal to another
analog input (e.g VIDEO) and select it.
Are the signal on AMP5 Assy CP201 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