NEC MultiSync FE700 Serviceanleitung Seite 78

[C] Pre-Adjustment
1. High-Voltage Adjustment Signal 20 (1024*768(85)) All Black
(1) Initial Setting
SCREEN VR :
D.FOCUS VR (F1) :
S.FOCUS VR (F2) :
VR102 :
(2) Receive signal 20.
(3) Adjust VR102 slowly so that high voltage is 25.0 kV±0.2 kV.
[D] Main Adjustment
1. Screen Voltage Adjustment
Signal : No. 20 (1024*768 @85Hz) Cross hatch pattern
(1) Previous setting
Connect a high voltage probe to TP-G2 and adjust SCREEN VR to following value.
650 V
(Use a high voltmeter with maximum voltage of more than 1.5 kV and input resistance is more than 1000MΩ)
Adjust VR307 so that the back raster is just appears.
Adjust D.FOCUS VR (F1) and S.FOCUS VR (F2) in order to recognize displayed characters.
2. Horizontal Raster Position
Signal: No. 20 (VESA 1024*768@85Hz) Reverse cross hatch pattern
(1) Receive signal 20.
(2) Open Menu (F), TAG 2 "LEFT/RIGHT". And adjust "－" SW so that the horizontal position is left more.
(3) Adjust VR307 on the MAIN PWB so that the right side of the back raster appears.
(4) Make sure to set the position of control as follows.
VR302 : Mechanical center
(5) Open Menu (F), TAG 2 "NARROW/WIDE", and adjust "+", "－" SW so that the horizontal size of
raster is maximum just under bezel.
(6) Adjust VR302 so that the distance between XLeft and XRight meets spec as below.
Safety
Fully counterclockwise (MIN)
Keep the adjusted position at PKG process
Keep the adjusted position at PKG process
Fully counterclockwise (MIN)
± 5 V
DC DC
|XLeft - XRight| ≦ 1.5 mm
XLeft
Fig 2-1 Horizontal Raster Centering
Bezel
Raster
XRight
Video
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