(11) Video Amplitude
* Check to make sure the video input signal is set at the following
level.
VIDEO
:
Analog 0.7Vp-p ±0.02V
terminal)
(ll-1)Writing the Color Adjustment Reference Value signal 13 (VGA480 WINDOW)
(a) Receive signal.
(b) Short SW42 on Adjustment jig.(TP-A and
(c) Push MEMORY RECALL SWITCH(SW109) for at least 2 seconds.
(d) Release the short.
(ll-2)lnitial Settings of Adjustment VRs
VR701~703 GAIN VR
:
Fully counterc
VR704~706 BIAS VR
:
Fully counterc
VR707~709 SUB BRIGHT VR
:
Fully counterc
SCREEN VR
:
Fully counterc
VR710 SUB BIAS VR
:
Fully counterc I
(ll-3)Attenuator control voltage
(a) Receive the window pattern.
ockwise
ockwise
ockwise
ockwiae
ockwise
signal 13 (VGA480 WINDOW)
(b) Turn the contrast control fully clockwise.
(c) Adjust VR854 so that the voltage across TP41 on Adjustment jig
(TP-B and
is 3.OOV ±O.O3V.
(ll-4)Gain adjustment
(a) Receive the window pattern.
signal 13 (VGA480 WINDOW)
(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) and
TP903(B). If the settings are not correct, readjust.
clamp pulse is
not included
22
Summary of Contents for JC-1531 VMA-2
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