Pioneer VSX-918V-K Service Manual page 33

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