NEC MultiSync 4FGe Service Manual page 23

(11) Video Amplitude
* Check to make sure the video input signal is set at the following
level.
VIDEO : Analog 0.7Vp-p ±0.02V (75Q+lX
(ll-1)Writing the Color Adjustment Reference Value signal 13 (VGA480 WINDOW)
(a) Receive signal.
(b) Short SW42 on Adjustment jig.(TP-A @ and 0)
(c) Push MEMORY RECALL SWITCH(SW109)
(d) Release the short.
(ll-2)lnitial Settings of Adjustment VRs
VR701~703 GAIN VR
VR704~706 BIAS VR
VR707~709 SUB BRIGHT VR : Fully counterc
SCREEN VR
VR710 SUB BIAS VR
(ll-3)Attenuator control voltage
(a) Receive the window pattern.
(b) Turn the contrast control fully clockwise.
(c) Adjust VR854 so that the voltage across TP41 on Adjustment jig
(TP-B @I and 0) is 3.OOV ±O.O3V.
(ll-4)Gain adjustment
(a) Receive the window pattern.
(b) Turn the contrast control fully clockwise.
Turn the brightness control fully counterclockwise.
(c) Adjust VR7Ol(R),VR702(G),VR703(B) so that the terminals TP9Ol(R),
TP902(G) and TP903(B) on the CRT PWB are each set to 47Vp-p(±lV
or less). (Not including the clamp pulse.)
If it is not possible to obtain a voltage of 47Vp-p, readjust
VR854 so that the R,G or B signal having the smallest wave height
is set to 47Vp-p. Then adjust the other two color signals to
47Vp-p by turning the GAIN VR counterclockwise.
(d) After adjusting, check the amplitude of TP901(R),TP902(G)
TP903(B). If the settings are not correct, readjust.
terminal)
for at least 2 seconds.
: Fully counterc ockwise
: Fully counterc ockwise
ockwise
: Fully counterc ockwiae
: Fully counterc I ockwise
signal 13 (VGA480 WINDOW)
signal 13 (VGA480 WINDOW)
22
and
clamp pulse is
not included