Rear View; Power Supply Unit - Hitachi 55PMA550 Service Manual

Item Vs and Va VOLTAGE ADJUSTMENT
Applicable Model
Preparation
(1) Keep heat-run for 1 minutes or more.
(2) Connect the DC Voltmeter to the Vs test point
and the GND point (or the Va test point and the
GND point) on the Power Supply Unit.
(3) Receive the all black signal with no setup.
(4) Check the indication of Vs and Va voltages
printed on the label located upper left side on
the Panel Module.
55PMA550/55HDM71 (PW1)
55PMA550 , 55HDM71
Label
Y-sus

Power Supply Unit

(1) If the difference between the printed voltage of Vs
and the indicated value of Vs Voltmeter is over
0.1V, adjust the Vs ADJ VR located on the Power
Supply Unit to make it within 0.1V.
(2) If the difference between the printed voltage of Va
and the indicated value of Va Voltmeter is over
0.2V, adjust the Va ADJ VR located on the Power
Supply Unit to make it within 0.2V.
(3) Check and do the procedure (1) again.
<Example of the Voltage Label>
<LOT> **************
Vs= 82.0V
Vw=180.0V
Power
Supply
Unit
Logic
Panel Module
24
Procedure
Va=63.0V
Vx=40.0V
X-sus

(Rear View)

Vs ADJ
Vs
Va ADJ
Va
GND