Pioneer 1014TX-K - THX Select A/V Receiver, Service Manual

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VSX-52TX
124
1 2 3 4
1 2 3 4
C
D
F
A
B
E
7.1.5 TROUBLE SHOOTING OF THE DSP ASSY
(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.
• When a sound is not out in the multi-channel signal playback or surround mode with the digital signal input.
• 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 0: Preliminary check Step 3: Regulator IC
Step 4: 3
→
5V conversion
MUTE (pin 54)
IC901-pin 1 (to chassis)
Is
there the input
of 5V ?
Check CN901 and
REGULATOR Assy
Is 3.3V
outputting it ?
IC901-pin 3 (to chassis)
IC902-pin 2 (to chassis)
No
Replace IC901
No
Yes
Is 1.25V
outputting it ?
Replace IC902
Replace IC952
No
Yes
A
Step 1: Mute pin
Step 2: B to B connector
IC801
End
Is
output signal
0V ?
Replace IC801
No
Yes
CN901
CN701
Is
connector
inserted
tight ?
Turn the power off and
Insert it tight
No
Yes
IC952
Pin 3
Does
it convert
3V into 5V for
17 pin input?
No
Yes
Replace IC952
Pin 5
Does
it convert
3V into 5V for
15 pin input?
No
Yes
Replace IC952
Pin 7
Does
it convert
3V into 5V for
13 pin input?
No
Yes
CN951
Is
connector
inserted
tight ?
Turn the power off and
Insert it tight
No
Yes
Is
connector
inserted
tight ?
Turn the power off and
Insert it tight
No
Yes
End
Yes
End