Pioneer SC-65 Service Manual page 33

5
NO SOUND
This is just for general reference and does not including every single case.
No Sound
Check CONNECTORs and FFCs
MIC HPV-REGINTERFACE
AUDIOD-AUDIO BRIDGE
DIGITAL MAIN ASSY
No
When headphone is
connected,speaker
Head Phone
relays turn off
(hear relay click sound)
Analog in (e.g CD)
Pre OUT Front ch Pure Direct
Pre out sound
Change to
"Auto Surround"
Check A-DAC BRIDGE ASSY
CN3794,3793 21,23 pin Signal
(FL OUT, FR OUT)
Check the audio signal in AUDIO ASSY
(CN2502 21,23 pin IC2702IC2501
IC3101JA3101)
or replace AUDIO ASSY
No
Pre OUT Front ch
Speaker Front ch
Signal
Analog in (e.g CD)
Pre OUT
(Front ch is OK) Select EXT. STEREO
Analog in (e.g CD)
Speaker
(Front ch is OK)
Select EXT. STEREO
Analog inoutput
Zone2 Audio no
from Zone 2 line
output (MAIN is OK)
Check the audio signal in AUDIO ASSY
(IC2501 34,35 pin
JA6701 Zone 2 OUT terminal)
or replace AUDIO ASSY
Check the audio signal in AUDIO ASSY
(IC2501 77,78 pin
JA3206 Zone 3 OUT terminal)
or replace AUDIO ASSY
Zone3 Audio no output
Analog inoutput
from Zone 3 line
(MAIN is OK)
B
5
6
Check MIC HP ASSY
No Problem /
No Damage CN3472 7 pin(XHPDET)
When headphone is
connected, +3.3V 0V
Yes Yes
Pre OUT Front ch
No
No Diagnose AUDIO ASSY
Go to flow [A]
Yes
Analog Input
No
INPUT ?
Yes
Digital Input
Set"STEREO"mode with
STANDARD SURROUND key.
Yes
Yes
When speakers set ON/OFF
with SPEAKERs key, is INTER
FACE ASSY CN7006 9 pin
changed 0  5V ?
No
DIGITAL MAIN ASSYCN603
Yes
14 pin changed 0 5V?
No
Check IC612 11, 13 pin on
DIGITAL MAIN ASSY. If it is OK,
repalce DIGITAL MAIN ASSY
A-DAC BRIDGE ASSY
No
CN3794,3793
5,7,9,11,13,15,17,19 pin Signal
Yes
Check the audio signal in AUDIO ASSY
[CN2502 5,7,9,11,13,15,17,19 pin
IC2501 or IC3273(IC3221)
IC2751,IC3151,IC3201,IC3251,IC3271,
IC3272Preout terminals]
or replace AUDIO ASSY
No
When speakers set ON/OFF with
Pre OUT of C, SL, SR,
SPEAKERs key, is INTERFACE
Yes
ASSY CN7006 6,7,8,10 pin
SBL, SBR, FHL or FHR
changed 05V?
OK?
C
DIGITAL MAIN ASSY CN602
2 pin, CN603 11, 12, 13 pin
changed 05V?
Only iPodUSB and HMG
can be selected for zone 2
digital input.
Check relay ON/OFF signal at
BD,HDMI can't be selected.
IC612 and IC601 on DIGITAL MAIN ASSY.
It's specification.
If it is OK, repalce DIGITAL MAIN ASSY
Yes No
Digital inoutput
from Zone 2 line out?
No
Yes
Only iPodUSB and HMG
can be selected for zone 3
digital input.
BD,HDMI can't be selected.
It's specification.
No
No
Yes
Digital inoutput
from Zone 3 line out?
6
7
Diagnose MIC HP ASSY
No
(arround Q3451)
or replace MIC HP ASSY
Yes
Diagnose or replace
DIGITAL MAIN ASSY
Diagnose MIC HP ASSY
Check MIC HP ASSY
Yes
(arround JA3476)
CN3472 1 or 3 pin (HP
or replace MIC HP ASSY
OUTPUT SIGNAL)
No
Check CONNECTORs and FFCs
MIC HPV-REG
INTERFACEAUDIO ASSY
Check the audio signal in AUDIO ASSY
(Selected input terminalIC2501
No
A-DAC BRIDGE ASSY
CN2502 25,27 pin)
CN3794,3793 25,27 pin Signal
or replace AUDIO ASSY
Yes
D-DAC BRIDGE ASSY
No
D-DAC BRIDGE ASSY
CN3781 20,23,24,25 pin
CN3781 3,9,10,12 pin Clock,Data
Clock,Data
Yes
Diagnose DAC HIGH ASSY
(DA part is NG)
Go to flow [B]
Yes
AUDIO ASSY IR BUFFER ASSY
CN3051 10,14 pin Signal CN6803 1,6 pin Signal
No
Diagnose or replace
Check the signal path of
IR BUFFER ASSY
FL OUT,FR OUT in AUDIO ASSY
or replace AUDIO ASSY
Check relay signal path between
INTERFACE ASSY and DIGITAL MAIN ASSY
D-DAC BRIDGE ASSY
No
CN3781 20,23,24,26,27,28 pin
Clock,Data
Yes
Diagnose DAC HIGH ASSY
(DA part is NG) Go to flow [B]
AUDIO ASSY
Yes
CN3051 2,4,6,8,12,16,18 pin
Signal
No
No
Check the signal path of audio
output signals in AUDIO ASSY
Yes
or replace AUDIO ASSY
No
Check relay signal path
between INTERFACE ASSY
and DIGITAL MAIN ASSY
D-DAC BRIDGE ASSY
A-DAC BRIDGE ASSY
No
CN3781 14,15 ,16 ,18 pin
CN3794,3793 1,3 pin Signal
Clock, Data
Yes
Diagnose DAC HIGH ASSY
Check the audio signal in AUDIO ASSY
(CN2502 1, 3 pin IC2501) or replace
(DA part is NG) Go to flow [B]
AUDIO ASSY
Zone line out is OK, but speaker out NG.
Zone speaker out takes same signal path as
one of main channels.(It can be selected by
SP system setting.)
Yes
Refer to speaker (front is OK) flow.
Which channels correspond to zone, refer to
instruction manual.
SC-65
7
8
No Problem /
No Damage
Diagnose AUDIO ASSY
(circuits arround IC2801)
or replace AUDIO ASSY
No D-DAC BRIDGE ASSY
CN3781 5 pin Clock
No
Yes
Yes
Diagnose or replace
Diagnose DAC HIGH
DIGITAL MAIN ASSY
ASSY(AD or DIR part is NG)
Go to flow [B]
Yes
Diagnose or replace
D-AMP_S ASSY
No
Diagnose or replace
DIGITAL MAIN ASSY
IR BUFFER ASSY
Yes Diagnose or replace
Yes
CN6802 3,8,13,18 pin,
D-AMP_S ASSY
CN6803 11,16,21 pin Signal
No
Diagnose or replace
IR BUFFER ASSY
No Diagnose or replace
DIGITAL MAIN ASSY
Yes
C
8
A
B
C
D
E
F
33