Sony Trinitron KV-25XBR Service Manual page 20
P2b chassis scc-595b-a
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Also See for Trinitron KV-25XBR:
- Operating instructions manual (20 pages) ,
- Operating instructions manual (20 pages)
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PX ADJUSTMENT
I
'?eceive dot signal with channel 9.
'Jbserve pin
(j)
of A· 7 connector with· an oscilloscope.
tJ.djust it with the MPX volume (RV202).
KV-25XBR
RM-724/APM-X3U
oscilloscope
KV-25XBR
RM-724/APM-X3U
IN. DYNAMIC COLOR ADJUSTMENT
I
(1)
Receive color bar signal.
(2)
N.D.C .....
Blue ON state
PICTURE VOLUME .....
Minimum
BRIGHTNESS VOLUME .....
50%. (resetting)
(3)
Watch the potential
at the points of
NDC.B
and
NDC•B
Pedestal
- - - - - level
-- ov
-~
NDC·G
to the pedestal at the point of
NDCR-2
with RV404 (BLUE P.D) and RV405 (GREEN P.D), and
adjust
so that
the input
level
offset
becomes
disappear.
(4) Apply 6V DC to pin
@
of A-16 connector (SUB BRT),
and adjust
the pedestal
levels at the points
of
NDC.R· 1 and NDC R-2 so as to they become the
same level with RV407 (RED P.D).
(5)
Switch the NOC at green and red, and confirm that
there have been no differences in adjustments.
Pedestal
'-~-~---
-- level
-- ov
NDC•G
regulate-de power supply
--~
I
14.3 MHz• fo ADJUSTMENT
I
(1)
Receive color bar signal.
(2)
HUE VOLUME .....
50%
COLOR THICKNESS VOLUME ... 50%
Resetting
PICTURE VOLUME . . . . . 70%
(3)
Connect pin
@
of IC301
to GND through
via
10 kO resistor.
(4)
Connect pin
@
of IC301 to 12 V via 10 kO resistor.
n n ___
[
fe~~7stal
J
L-,-J
LJ~:
ov
NOC R-2
11
NOC R-1
(5) Short pins
@
and
@
of IC301.
(6)
Observe pin
@
of/C301
with an oscilloscope, and
confirm that the color signal is out of synchronization.
(7)
Turn CV316 to make color synchronization.
Oscilloscope
Oscilloscope
-~
I
SEPARATION ADJUSTMENT
I
(1)
Receive stereo signal
[coMB
TYPE FILTER ADJUSTMENT
I
(1)
Set at TV mode and receive color bar signal.
(2)
Connect an oscilloscope to the Y signal output of the
comb type filter (the emitter of Q304), and adjust
RV301 (GAIN} and L303 (PAHSE) taking tracking, so
as the chroma
component
of the waveform
to
becomes minimum.
Make 3.58 MHz carrier component
to be minimum.
(2) Adjust (MPX ADJ) with RV202 so that the separation
becomes optimal.
- 21 -
~
tf8
j
SUB-CONTRAST ADJUSTMENT
I
(1)
Receive color bar signal.
(2)
COLOR PICTURE VOLUME .....
Maximum
COLOR THICKNESS VOLUME .....
Minimum
(3)
Adjust the waveform of pin
@
of IC401 to that as
shown in the diagram with RV302 (SUB CONT)
2.3±0. 1 Vp-p
- 22 -
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