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2-5) Adjustment of Video Amplitude and White Balance
NOTE: Before performing this adjustment, make sure that the VIDEO signal is as follows:
VIDEO signal: Analog 0.7 Vp-p
(1) Default Settings of the Adjustment VRs
VR701 - VR703
GAIN VR
Fully left
VR704
SUB CaNT VR
Fully right
VR901 - VR903
BIAS VR
Fully left
V R904 - V R906
SUB BRIGHT VR
Fully right
VR907
SUB BIASVR
Fully right
Screen VR
Fully left
(2) Video Contrast Adjustment
2-1)
GAIN VR Adjustment: Signal 10 (All-white signal)
a)
Receive the window pattern of Signal 10. (A video range of 1/3 -
1/2 H x 1/2V
within the range where the ABL circuit is not applied despite maximum Contrast
is desirable.)
b)
Rotate the Contrast V R fully to the right.
Rotate the Brightness V R fully to the left.
c)
Adjust VR701, VR702, and VR703 so that the ROUT, G OUT, and B OUT terminals
on the VIDEO PWB are each set to 40 Vp-p. After adjustment, confirm the Vp-p
value of each terminal and perform readjustment if necessary.
Do not include the clamp pulse.
Vp-p
2-2)
SUB CaNT VR Adjustment
a)
Rotate the Contrast VR fully to the left.
Rotate the Brightness VR fully to the left.
b)
Adjust VR704 so that G OUT on the VIDEO PWB becomes 10 Vp-p. After adjust-
ment, confirm that both R OUT and B OUT are within the range of 10 Vp-p t 0.5
Vp-p.
If the R, B OUT is not within the limits mentioned above, adjust finely VR704 so the
R, G, B OUT is within 10 Vp-p to.5 Vp-p.
(3) Cutoff Adjustment (All-black signal)
Rotate the Contrast V R fu lIy to the left.
a)
Perform the two steps below in the (1)
-+
(2) sequence.
(1) Create a short-circuit between TP901 and TP902.
(2) Create a short-circuit between TP401 and TP402.
b)
Turn the Screen Control clockwise gradually and set to the position at which a single
horizontal color appears faintly.
Use this color as the reference color for the cutoff adjustment.
c)
Turn the Bias Controls for a color other than the reference color clockwise until it is as
bright as the reference color.
-24-
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