Pioneer PDP-424MV Service Manual page 35

Adjustment method in part replacement of the PDP module
After assembling the unit, perform the panel-drive voltage adjustment in the following order.
1. Check each voltage value (Vbw, Vsw, Vp and -Vw) in a drive voltage label (panel eigenvalue).
Drive voltage label Vbw/Vsw/Vp/-Vw
( s170.0/d65.0)
115.0/209.5/199.8/45
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2. -Vw adjustment
Measuring point: The voltage between test point Vw on the high voltage PKG and GND (chassis GND)
Adjustment: Adjust VR4 so that the voltage of Vw becomes Vw value of drive voltage label ± 0.5V.
3. Vbw adjustment
Note: Perform this adjustment after -Vw adjustment
Measuring point: The voltage between test point Vbw on the high voltage PKG and test point Vw
Adjustment: Adjust VR3 so that the voltage of Vbw becomes Vbw value of drive voltage label ± 0.5V.
Example
Vbw = 115.0V
Vsw = 209.5V
Vp = 199.8V
-VW = -45V
VR4 (-VW)
TP : Vw
High voltage
PKG
VR3 (Vbw)
TP:Vbw
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