NEC MultiSync FE700 Serviceanleitung Seite 83

5. Video Amplitude Adjustment
Make sure that the video signal level of generator is as follows :
Video : Analog 0.7 Vp-p ± 0.01 Vp-p (terminated 75 ohms ±1 %)
5-1. Gain Adjustment
Signal : No. 31 (VESA 1024*768@85Hz(Window))
White window pattern
(1) Receive the signal 31(White window pattern).
(2) If the back raster appears, adjust VR307 on the MAIN PWB so that the back raster disappears.
(3) Open Menu(F), TAG 1-2 "CONTRAST MAX" and adjust value to 180.
(4) Open Menu(F), TAG 3-2 "GAIN MAX. ADJUSTMENT" and select "RED". Adjust the wave form of
TP-R on the CRT PWB to 45Vp-p±1Vp-p by "+", "－" SW .
(Do not include clamp pulse. Refer to Fig 5-1.)
Note : Press the "PROCEED" SW to hide OSM, while performing this adjustment.
(5) Adjust "GREEN" and "BLUE" also.
(6) Close menu.
5-2. Cut Off Adjustment
Signal : No. 31 (VESA 1024*768@85Hz(Window)) All black
(1) Receive signal 31
(2) Open Menu (F), TAG 1 "BRIGHTNESS" and set to 127.
(3) Open Menu (F), TAG 3-1"BIAS ADJUST".
(4) Set "RED", "GREEN" and "BLUE" to 10.
Note : Here after, use a color analyzer CA-100. Hide the OSM menu when confirming the adjustments.
(5) Setting 00 channel of x, y and Y mode at the color analyzer and make sure that the following
value is set.
x = 0.291y = 0.306
(6) Turn the CA-100 into analyzer mode.
(7) Turn the VR307 on the MAIN PWB clockwise until back raster appears. The color that appears
first is the reference color. Adjust VR307 so that its color analyzer indicated value is 20 - 80.
(8) Open Menu (F), TAG 3 " BIAS ADJUST" and adjust "(reference color) BIAS" so that its color
analyzer indicated value is 100 - 120.
(9) Open Menu (F), TAG 3 " BIAS ADJUST" and adjust "(other colors) BIAS " so that its color
analyzer indicated value is 100 - 120.
Note : When the indicated value of the reference color is over 120, repeat steps (7) to (8).
(10) Close menu.
45 ± 1 Vpp
Fig 5-1 Video Amplitude (MAX)
Y = 0.2 cd/㎡
5-18
Clamp pulse