Hitachi 50PD9800TA Service Manual page 22

Power unit Adjustment
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.
(3) Connect voltmeter leads to Va and GND
test points of the power unit.
50PD9800TA (FW1)
Power Unit Vs,Va Ajustment
Turn Vs ADJ to adjust Vs voltage
to be within ±0.1V of the value
specifi ed in the label on the panel.
(1)
① Ajust within ±1V at Vs1
② Ajust within ±0.1V at Vs2
Turn Vs ADJ to adjust Vs voltage
to be within ±0.1V of the value
specifi ed in the label on the panel.
(2)
① Ajust within ±1V at Va1
② Ajust within ±0.1V at Va2
(3) Reconfi rm that Vs voltage remains within
±0.45V of the specifi ed value.
Reajust if it's outside of the margin.
(4) Reconfi rm that Va voltage remains within
±0.55V of the specifi ed value.
Reajust if it's outside of the margin.
22
Procedure