Pioneer VSX-1127-K Service Manual page 27

5
A
A B
Yes No
Input analog in (e.g. CD).
Set "PURE DIRECT" ->
Sound output from SP out?
No
Check the AMP7 Assy CP401
pins 1, 9 signals.
No
Change analog input signal to another
analog input (e.g VIDEO) and select it.
Check the AMP7 Assy CP401 pin 1, 9 signals.
No
Check the AUDIO Assy CP16 pin 1
(12V), pin 5 (- 12V).
No
Check connector between CP16 on
AUDIO Assy and CP19 on the
MAIN Assy.
No Problem / No Damage
Replace CP16 on the AUDIO Assy or
CP19 on the MAIN Assy or
replace the MAIN Assy or AUDIO Assy.
Change to Auto Surround.
Check the BRG Assy CN2107
pins 5, 7 signals.
No
Check the BRG Assy CN2110
pins 17, 19 signals.
No
INPUT?
Analog input
Check the BRG Assy CN2110
pins 21, 23 signals.
No
Check the AUDIO Assy CP12
pins 1, 3 signals.
No
Check and repair analog audio lines
between IC2501 pin 31, 32 and CP12
pins 1, 3 or replace the AUDIO Assy.
B
5
6
Yes
Yes
Check and repair FL or FR AMP
circuit or replace the AMP7 Assy.
Check the problem analog signal line between
Yes
input connector and IC2501 (Input selector IC)
or replace the AUDIO Assy.
Yes
Check CP13 pin 2 (VLSCK),
pin 3 (VLSO).
No
Check the data signals at the following locations VLSCK pin 2, VLSO pin 3
CN2203 (FRONT Assy) -> CN2202 (BRG Assy) -> CN2113 (BRG Assy) -> CN1504 ( D-MAIN)
If no signals on BRG Assy, replace BRG Assy. If no signals on CN1509, replace D-MAIN Assy.
Yes
Repair IC2702 and its peripheral
circuit or replace the AUDIO Assy.
Yes
Check the BRG Assy CN2203
pin 21 (12V), pin 20 (-12V).
No
Check the AUDIO Assy CP16
pin 1 (12V), pin 5 (- 12V).
No
Digital input
Yes
Is digital signal from OPT
(or COAX) input OK?
No
Repair IC1801, IC1807 and its
peripheral circuit or
replace the D-MAIN Assy.
Yes
Replace the BRG Assy.
VSX-1127-K
6
7
Yes
Repair IC2502 and its peripheral
circuit or replace the AUDIO Assy.
Yes
Repair IC2762 and its peripheral
circuit or replace the BRG Assy.
Yes
Check +/- 12V line on BRG Assy or
replace the BRG Assy.
Yes
Repair IC1801 and its peripheral
circuit or replace the D-MAIN Assy.
7
8
A
B
C
D
E
F
27
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