Trouble Shooting Of The Dsp Assy - Pioneer VSX-52TX Service Manual

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7.1.5 TROUBLE SHOOTING OF THE DSP ASSY

QQ
• When a sound is not out in the multi-channel signal playback or surround mode with the digital signal input.
3 7 63 1515 0
(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.
A
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
B
MUTE (pin 54)
Is
output signal
0V ?
Yes
End
C
Step 2: B to B connector
CN901
TE
L 13942296513
Is
connector
inserted
tight ?
Yes
CN701
D
Is
connector
inserted
tight ?
Yes
CN951
Is
connector
inserted
tight ?
E
Yes
End
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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
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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
Q Q
3 6 7 1 3
Step 4: 3 → 5V conversion
IC952
Pin 3
Does
it convert
3V into 5V for
17 pin input?
Yes
Pin 5
Does
it convert
3V into 5V for
15 pin input?
Yes
Pin 7
Does
it convert
3V into 5V for
13 pin input?
Yes
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A
.
VSX-52TX
3
4
2 9 9 4 2 8
No
Check CN901 and
REGULATOR Assy
No
Replace IC901
No
Replace IC902
1 5 0 5 8 2 9 9 4
No
Replace IC952
No
Replace IC952
No
Replace IC952
m
co
4
9 9
2 8 9 9