Pioneer HTP-072 Service Manual page 21

5
A B
Auto Surround
Are the signal on CNT
Assy CP115 pins 17, 19?
Yes
Repair IC402, IC403 and its peripheral
circuit or replace MAIN Assy.
Analog
input
INPUT?
Digital
input
Repair IC2207 (PCM9211), IC2209 (PCM1681)
and its peripheral circuit or replace D-MAIN Assy.
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 .
HTP-072: Check signals of problem channel
on AMP6 Assy CP401 pin 3 (SL), 5(C), 7(SR).
VSX-323: Check signals of problem channel
on AMP5 Assy CP201 pin 3 (SL), 5(C), 7(SR).
Yes
Check and repair AMP circuit of problem
channels or replace AMP6 Assy.
D
5
6
Check the voltage.
No
(MAIN Assy CP110 pin 3: +12 V)
(MAIN Assy CP110 pin 1: -12 V)
Yes
Check MAIN Assy CP14 pin 15
(VOL_CLK), pin 14 (VOL_DATA).
Yes
Repair IC400 and its peripheral
circuit or replace MAIN Assy.
No
Are the signal on CNT
Assy CP110 pin 5, 7?
No
Are the signals on CNT
Assy CN110 pins 1, 3?
Yes
Is Digital signal from OPT
(or COAX) input OK?
Yes
No
Change speaker system to correct
setting.
No
Check CPU Assy CP2 pin 6
(C_RLY) pin 5 (S_RLY).
Check signals of problem channel
No
on CNT Assy CP115 pin 15 (SR),
13 (SL), 11 (C), 9 (SW).
Yes
Replace MAIN Assy
or their peripheral circuit.
6
7
No Problem / No Damage
Check between MAIN Assy CP110
and CNT Assy CP115.
No Check the data signals at the following locations.
VOL_CLK pin 15, VOL_DATA pin 14, CP2 (CPU Assy) - CP14 (MAIN Assy)
Yes
Check signal line between
CP110 and CP115.
Yes
Replace CNT Assy.
No
Are the signals on MAIN
Assy CP110 pins 21, 23?
Yes
Replace CNTAssy.
Is the digital signal
No
(OPT) on D-MAIN Assy
CP2005 pin 1?
Yes
Repair IC2207 (PCM9211), IC2209 (PCM1681)
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 CNT Assy CP110 pin 9 (SR),
11 (SL),13 (C),15 (SW).
Yes
Check the signal CP110 - CP115
or replace CNT Assy.
E
HTP-072
7
8
C
Replace CN2 on MAIN Assy or
replace MAIN Assy.
Check the voltage.
No
(MAIN Assy CP110 pin 3: +12 V)
(MAIN Assy CP110 pin 1: -12 V)
Yes
Check +/- 12 V line on MAIN Assy
or replace MAIN Assy.
Check and repair analog audio lines
No
between IC400 pins 54, 55 and CP110
pins 21, 21 or replace MAIN Assy.
No
Replace OPTCO Assy.
No
8
A
B
No
C
D
E
F
21