Hitachi P42T01E Service Manual page 11

50PDP Vs and Va Adjustment
Item
(1) Turn on the set and perform
pre-heat run for more than 1 min
on burn-in screen.
(2) Receive full back pattern signal.
(or Video silence signal; it will
automatically turn off after a few seconds
by the power save function)
(3) Connect voltmeter leads to the Vs (or Va) and
GND test points of the power unit.
Label example
<LOT>N6
Vs=80.0V Va=60.0V
Vw=140.0V Vx=60.0V
Va2: Va fine
adjustment VR
Caution: 42PDP does not require adjustment. ( 42PDP is self-adjustmenting.)
P50T01U/E P50TP01U/E P42T01U/E P42TP01U/E
Preparation
Vs1: Vs coarse
adjustment VR
Va1: Va coarse
adjustment VR
Power Unit Vs, Va Adjustment
(1) Turn Vs ADJ to adjust Vs voltage
to within ±0.1V of the value
specified in the label on the panel.
1 Adjust within ±1V at Vs1
2 Adjust within ±0.1V at Vs2
(2) Turn Va ADJ to adjust Vs voltage
to within ±0.1V of the value
specified in the label on the panel.
Adjust within ±1V at Va1
1
Adjust within ±0.1V at Va2
2
(3) Reconfi rm that Vs voltage remains within
±0.45V of the specifi ed value.
Readjust if outside of the margin.
(4) Reconfi rm that Va voltage remains within
±0.55V of the specifi ed value.
Readjust if outside of the margin.
Vs2: Vs fine
adjustment VR
CN99: Vs,Va test points
1
10
Procedure
3 GND
2
Vs
Va