VIDEOKHROMA
ADJUSTMENT (Continued)
Adjusting Conditions Adjusting Procedures
8.
R -Y/B
-Y
Discriminator Adjustment
Adjusting Point
0
T1804:
R
-
Y
Discriminator
0
T1805:
B
-
Y Discriminator
1.
Receive “SECAM COLOUR BAR” signal with colour
bar generator.
2.
Connect the oscilloscope (with two
channecls)
to
TP851
(R
-
Y)
and the
TP853
(B
-
Y),
both located
on the CRT Socket Unit of the set.
l
Renge:
lV/div.
DC
l
Sweep Time:
20psec
/
div.
3.
Set service switch
51401
at the Video Cut position
’
to cut-off the Y-signal.
4.
Set both the Contrast and Brightness controls to
their maximum postions.
1.
Adjust
T1804
(R
-
Y)
and
T1805
(B
-
Y)
so that DC
output level with
colour
control set at minimum
will be the same as that with
colour
control set at
100%
of saturation. (A
=
B)
* Connect capacitor (0.001
,xF)
to
TP851
and
TP853,
thus to prevent noise interference.
2.
Set service switch
51401
to the canter position.
TP851
TP853
*
B
DC
OV
Same
DC output level
11
To Next Page
Loading...
