Pioneer VSX-1128-K Service Manual page 26

1
No Sound
A
This is just for general reference and does not including every single case.
No Sound
Headphones
When headphones is connected,
relay is change to headphones?
(BRI-1 Assy CN2114 pin 14 0 -> 3.3 V)
B
Check BRI-1 Assy CN2114 pin 2
(HP_DET) is low with connection
of the headphones.
Replace the HPMIC Assy.
C
Speaker Front ch sound
Set "STEREO" mode with STANDARD
SURROUND key and Speaker ON/OFF with
SPEAKERS key. (CPU Assy CN302 pin 8 0 -> 5 V)
Input analog in (e.g. CD).
Set "PURE DIRECT" ->
Sound output from SP out?
D
Check the AMP7 Assy CP401
pins 1, 9 signals.
Change analog input signal to another
analog input (e.g VIDEO) and select it.
Check the AMP7 Assy CP401 pin 1, 9 signals.
Check the AUDIO Assy CP17 pin 1
(+12V), pin 5 (- 12V).
E
Check connector between CP17 on
AUDIO Assy and CP19 on the
MAIN Assy.
Replace CP17 on the AUDIO Assy or
CP19 on the MAIN Assy or
replace the MAIN Assy or AUDIO Assy.
F
A
A
26
1
2
Yes
Check the BRI-2 Assy R720
0 -> 12 V.
No
Replace Q1, Q8 on the BRI-2 Assy
or replace the BRI-2 Assy.
Replace the HPMIC Assy.
Yes
Check the connector between BRI-1 Assy
CN2114 and D-MAIN Assy CN1504.
No
Replace the D-MAIN Assy.
Yes
Yes
No
Yes
Check and repair FL or FR AMP
circuit or replace the AMP7 Assy.
No
Check the problem analog signal line between
Yes
input connector and IC2501 (Input selector IC)
or replace the AUDIO Assy.
No
Yes
Check the AUDIO Assy CP13
pin 2 (VLSCK), pin 3 (VLSO).
No
Check the data signals at the following locations VLSCK pin 2, VLSO pin 3
CN2203 (BRI-1 Assy) -> CN2114 (BRI-1 Assy) -> CN1504 (D-MAIN Assy)
If no signals on BRI-1 Assy, replace BRI-1 Assy. If no signals on CN1509, replace D-MAIN Assy.
No Problem / No Damage
B
VSX-1128-K
2
3
Yes
Does the sound output of
the speaker front ch?
No
Yes
Check the BRI-2 Assy CN8
pin 1 or 3 (HP OUTPUT SIGNAL).
Check the connector between BRI-2
Assy CP20 and AUDIO Assy CP15.
No Problem / No Damage
Replace the AUDIO Assy.
Relay Control Check Flow
No
Replace IC612, IC603 or
replace the D-MAIN Assy.
Yes
Repair IC2502 and its peripheral
circuit or replace the AUDIO Assy.
No
3
4
Yes
No
No
No Problem / No Damage
4