Sony XDP-4000X Operating Instructions (primary manual), Руководство по обслуживанию

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METHOD OF DETERMINING ACCEPTANCE OR REJECTION OF
INTELLIGENCE BOARD (A-3317-137-A) OF XDP-4000X
• No parts in the intelligence board can be repaired.
If the intelligence board is defective, the whole board
should be replaced.
Pin numbers of 9-pin D-SUB connector (CN707)
(viewed from the top of the set)
Note that the voltage given in the following
descriptions is relative to the ground power pin.
Intelligence board check
Is voltage at pin
!º
of IC707 +5V?
Is voltage at pin
3
of CN707
between –8 and –9V ?
Is the resistance between pin
1
of CN703
and ground hundreds of 100 kilohms or more
Pull cable out of CN703 on main board.
Is voltage at pin
2
of the CN703 +5V?
Intelligence board at fault
Intelligence board at fault
Intelligence board is normal
Main board at fault
Set ACC-OFF and pull cable out of
CN703 on main board
Main board at fault
Yes
Yes
Yes
Yes
Is voltage at pin
9
of IC707 +5V?
Is voltage at pin
2
of CN707 0V?
Is voltage at pin
9
of IC707 0V?
Add –8 to –9V to pin
2
of CN707
Yes
Yes
Yes
No
No
No
No
No
No
No
The fault of the main board may be caused by one of the
following:
1. Shorted CN703 (OPEN).
2. Shorted pins
!™
and
!¢
of IC702 (OPEN).
3. Damaged port of IC702.