Pioneer VSX-523-K Service Manual page 19

5
A B
Auto Surround
Are the signal on CONCT
Assy CN110 pin 9, 11?
Yes
Repair IC402, IC403 and its peripheral
circuit or replace MAIN Assy.
Analog
input
INPUT?
Digital
input
Speaker C (SB etc) ch (Front LR is OK)
Check selection of speaker system
by [SPEAKERS] key on front panel
is correct.
Yes
Check relay operating. (Refer to Relay
Control Check flow for Front ch.)
Yes
Select surround mode to EX.STEREO
in Advanced Surround .
Check signals of problem channel
on AMP5 Assy CP401 pin 3 (SL),
5(C), 7(SR).
Yes
Check and repair AMP circuit of problem
channels or replace AMP5 Assy.
D
5
6
Check the voltage.
No
(MAIN Assy W7 pin 10: +12 V)
(MAIN Assy W7 pin 13: -12 V)
Yes
Check CP15 pin 7 (VOL_CLK),
pin 8 (VOL_DATA).
Yes
Repair IC400 and its peripheral
circuit or replace MAIN Assy.
No
Are the signal on CONCT
Assy CN109 pin 5, 7?
No
Are the signals on CONCT
Assy CN109 pin 1, 3?
Yes
Is Digital signal from OPT
(or COAX) input OK?
Yes
Repair IC2011 (AK4588) and its
peripheral circuit or replace D-MAIN Assy.
No
Change speaker system to correct
setting.
No
Check CPU Assy CN208 pin 4
(C_RLY) pin 5 (S_RLY).
Check signals of problem channel
No
on CONCT Assy CN110 pin 7 (SR),
5 (SL), 3 (C), 1 (SW).
Yes
Replace MAIN Assy
or their peripheral circuit.
VSX-523-K
6
7
Check between MAIN Assy CP110
and CONCT Assy CN110.
No Check the data signals at the following locations.
VOL_CLK pin 7, VOL_DATA pin 8, CN208 (CPU Assy) - CP15 (MAIN Assy)
Yes
Check signal line between
CN109 and CN110.
Yes
Replace CONCT Assy.
No
Are the signals on MAIN
Assy CP110 pin 1, 3?
Yes
Replace CONCT Assy.
Is the digital signal
No
on D-MAIN Assy
CP2008 pin 1?
Yes
Repair IC2011 (AK4588) and its
peripheral circuit or replace D-MAIN Assy.
No sound from Speaker System
is "SP: OFF" is selected,
Check signals of problem channel
No
on CONCT Assy CN109 pin 9 (SR),
11 (SL),13 (C),15 (SW).
Yes
Check the signal CN109 - CN110
or replace CONCT Assy.
E
7
8
C
No Problem / No Damage
Replace MAIN Assy.
Check the voltage.
No
(MAIN Assy W7 pin 10: +12 V)
(MAIN Assy W7 pin 13: -12 V)
Yes
Check +/- 12 V line on MAIN Assy
or replace MAIN Assy.
Check and repair analog audio lines
No
between IC400 pin54, 55 and
CP110 pin1, 3 or replace MAIN Assy.
No
Replace OPTCO Assy.
No
8
A
B
No
C
D
E
F
19