Section 3: Safety-Related Adjustments; D Board; Hv Regulation Circuit Check And Adjustment; Hv Hold Down Circuit Operation Check - Sony KDP-51WS550 Service Manual

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.

SECTION 3: SAFETY-RELATED ADJUSTMENTS

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.
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KDP-51WS550/57WS550/65WS550