Hitachi 42PD9800TA Service Manual page 21

Item
Preparation
(1) Turn on the set and perform
pre-heat run more than 1 min
on burn-in screen.
(2)
Connect voltmeter leads to Vs
and GND test points of the power unit.
42PD9800TA (FW1)
Power Unit Vs Adjustment
Procedure
(1) Turn Vs ADJ to adjust Vs voltage
to be within ±0.1V of the value
specified in the label on the panel.
Adjust within ± 1V at Vs1
Adjust within ± 0.1V at Vs2
(2)
Reconfirm that Vs voltage remains within
±0.45V of the specified value.
Readjust if it's outside of the margin.
Label example
<LOT>N6
Vs= 80.0V Va=60.0V
Vw=140.0V Vx=60.0V
Vs1:Vs coares
adjustment VR
CN99:Vs test point
(Va)
1
Vs
2
3 GND
21
Vs2:Vs fi ne
adjustment VR