Yamaha PDM-4210 Service Manual page 16

PDM-4210
Item Vs and Va VOLTAGE ADJUSTMENT
(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 right side on
the Panel Module.
MuRata
S/N
MADE IN JAPAN
16
Preparation
MPF7409
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 upward 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 upward 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= 80.0V
Vw=140.0V
Power
Y-sus
Supply
Unit
Panel Module
Procedure
Va=60.0V
Vx=60.0V
Label
X-sus
(Rear View)
Va ADJ
Va
Vs ADJ
GND
Vs