Service manual

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