Sony Hi-Scan KP-51WS520, Руководство по обслуживанию

Страница: 58 / 157

KP-46WT520/51WS520/57WS520
KP-46WT520/51WS520/57WS520 58
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.
D BOARD HV REGULATOR
T8001 (RHT), IC8002,
IC8004, IC8005, PH8003,
R8014, R8015, R8017,
R8060, R80
1
2
RV8002
Part Replaced (
Y
) Adjustment (
X
)
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. Confi rm that the static voltmeter reading is 31.0 ± 0.3kV.
8. If not, adjust with RV8002 to the specifi ed value.
9. After adjustment, put the VR cover on RV8002 (as shown below) and
apply suffi cient amount of epoxy resin around RV8002 .
Remove the cap from
the unused terminal and
connect a static voltmeter
there.
epoxy resin
R
V
800
2
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.
D BOARD HV HOLD DOWN
T8001 (RHT), D8022,
IC8001, IC8014, R8008,
R8016, R8046, R8052,
R8072, R8078, R8079,
R8165 , R8019
RV8002
Part Replaced ( Adjustment (
Y
)
X
)
OPERATION CHECK
1. Receive any source.
2. Using an external DC supply, apply 5 VDC to pin 3 of CN5 on A Board.
Set will shutdown.
SECTION 3: SAFETY-RELATED ADJUSTMENTS