Sony KDP-51WS550 - 51" High Definition Projection Tv, Service Manual

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KDP-51WS550/57WS550/65WS550
D BOARD
3-1. HV REGULATION CIRCUIT CHECK AND
ADJUSTMENT
When replacing the following components marked with a
Y
on the
schematic diagram always check the HV regulation, and if necessary
re-adjust.
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HV REGULATION ADJUSTMENT
1. Receive the all white signal.
2. Set PIC MAX/BRT CENT.
3. Connect a HV static voltmeter to the unconnected plug of the
high-voltage block.
4. Power on the set.
5. Receive the all white signal.
6. Set PIC MAX/BRT CENT.
7. Confirm that the static voltmeter reading is 31.0 ± 0.4V.
8. If not, adjust with VR8001 to the specified value.
9. After adjustment, put the VR cover on VR8001 (as shown below) and
apply sufficient amount of epoxy resin around VR8001.
Remove the cap from
the unused terminal and
connect a static voltmeter
there.
epoxy resin
VR8001
3-2. HV HOLD DOWN CIRCUIT OPERATION
CHECK
When replacing the following components marked with a
Y
on the
schematic diagram always check the hold-down operation.
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OPERATION CHECK
1. Receive any source.
2. Using an external DC supply, apply 5 VDC to pin 3 of CN1504 on UA
Board. Set will shutdown.
SECTION 3: SAFETY-RELATED ADJUSTMENTS