Trouble Shooting Of The Dsp Assy - Pioneer VSX-1015-S Service Manual

5

7.1.5 TROUBLE SHOOTING OF THE DSP ASSY

• When a sound is not out in the multi-channel signal playback or surround mode with the digital signal input.
(SurroundBack is not out with the setting.)
• Suppose CR to be poor contact and that is not damaged.
• This shows failure analysis of DSP Assy.
IC Function
DIR&DIT (IC601) Digital audio Interface Receiver and Digital audio Interface Transmitter
8ch CODEC (IC701) 2ch Analog/Digital converter + 8ch Digital/Analog converter
DSP (IC801) Digital Surround Processor
FLASH ROM (IC851) Memory of the surround program
Step 0: Preliminary check
• Tighten the COAX Jack screws.
(GND of the DSP module floats from the chassis. And this unit
may not work normally, because the electric potential becomes
unstable.)
Step 1: Mute pin
IC801
MUTE (pin 54)
Is
output signal
0V ?
Yes
End
Step 2: B to B connector
CN902
Is
connector
inserted
tight ?
Yes
CN701
Is
connector
inserted
tight ?
Yes
CN952
Is
connector
inserted
tight ?
Yes
End
5
6
No
Replace IC801
No
Turn the power off and
Insert it tight
No
Turn the power off and
Insert it tight
No
Turn the power off and
Insert it tight
6
7
Step 3: Regulator IC
IC901-pin 1 (to chassis)
Is
there the input
of 5V ?
Yes
IC901-pin 3 (to chassis)
Is 3.3V
outputting it ?
Yes
IC902-pin 2 (to chassis)
Is 1.25V
outputting it ?
Yes
End
VSX-1015-K
7
8
No
Check CN901 and
REGULATOR Assy
No
Replace IC901
No
Replace IC902
8
A
B
C
D
E
F
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