Pioneer VSX-918V-S Service Manual page 33

5
QQ
Step 5: 5 V to 3 V conversion
3 7 63 1515 0
IC331
Do
convert 5 V into
3 V for input?
Yes
To Step 6
Step 6: X'tal
IC261 (Pin 2)
Is there
a 24.576 MHz
output?
Yes
IC261 (Pin 7)
Is there
a 24.576 MHz
output?
Yes
IC261 (Pin 5)
TE
L 13942296513
Is there
a 24.576 MHz
output?
Yes
To Step 7
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.
5
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6
No
Replace IC331.
No
Replace IC261 or X261.
No
Check the path to pin 45 of IC201.
Replace IC201.
No
Check the path to pin 30 of IC101.
Replace IC101.
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7
Step 7: ROM
2 9
8
IC251 (Pin 1)
IC251 (Pin 2)
IC251 (Pin 5)
IC251 (Pin 6)
Is there
movement (0 V ⇔
3.3 V) when turned the
MCACC on, and does
movement stop within
3 sec.?
Yes
IC201 (Pin 70)
Is the
voltage output about
3.3 V during the operation
mentioned
above?
Yes
Is the
voltage output about
0 V after the operation is
completed mentioned
above?
Yes
To Step 8
Q Q
3 6 7 1 3 1 5
Step 8: DSP output (digital)
Digital output when indicated each CH.
IC201 (Pin 5)
Is there
a data output?
Yes
IC201 (Pin 6)
Is there
a data output?
Yes
IC201 (Pin 7)
Is there
a data output?
Yes
To Step 9
co
.
VSX-918V-K
7
9 4 2 8
CS#
SO (DATA out)
SI (DATA in)
SCK (Clock in)
No
Replace IC251.
BUSY
No
Replace IC201.
No
Replace IC201.
0 5 8 2 9 9 4 2 8
Center/LFE data
No
Replace IC201.
(0 V ⇔ 3.3 V)
Surround L/R data
No
Replace IC201.
(0 V ⇔ 3.3 V)
Front L/R data
No
Replace IC201.
(0 V ⇔ 3.3 V)
m
8
9 9
A
B
C
9 9
D
E
F
33
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