Aboard Adjustments - Sony TRINITRON KV-20TS29 Service Manual

KV-20TS29/20TS32
KV-21STR2/2170RS
RM-Y116
5-2. ABOARD ADJUSTMENTS
RF AGC ADJUSTMENT(IF BLOCK VR)
1) Input a color-bar signal.
2) Adjust AGC VR of TU 101 so that snow noise and
cross-modulation disappear from the picture.
3) Confirm them at every channel.
H.FREQUENCY ADJUSTMENT (HFRE
1) Input a color-bar signal.
2) Set to Service adjustment Mode.
3) Connect a frequency counter to base of Q 550 (TP
-86 H.DRIVE).
4) Call the item of AFC, set to 3 level (free run).
5) Select HERE with{1]and|4].
6) Adjust with[3]and|6|for the 15734+ 60 Hz.
7) Call the item of AFC again, adjust the level" 0".
8) Write into the memory by pressing
then [ENTER].
V.FREQUENCY ADJUSTMENT (VFRE
1) Select video 1 with no connecting the signal.
2) Set to Service adjustment Mode.
3) Connect the frequency counter across connector
VDY (+) (CN501) connector and ground.
4) Select VFRE with(1]and 4].
5) Adjust with[3]and |6]for the 55 +0.5Hz.
6) Write the memory by pressing then
CROMA TRAP ADJUSTMENT (CROM
1) Input a red signal
2) Set to Service adjustment Mode.
3) Connect an oscilloscope CN703 Pin@ (R OUT) of
C board ground.
4) Select CROM with[1|and{4].
5) Adjust with|3]and(6|for the 0 level.
Element of sub-carrier
R-OUT |
=a — Olevel
ae eg oe ae
6) Write the memory by pressing |MUTING| then
ENTER] .
SUB CONTRAST ADJUSTMENT (SPIX)
1) Input a color-bar signal.
2) Set to Service adjustment Mode.
3) Set the conditions as follows.
PICTURE ---: -* MAX
COLOR - MIN
BRIGHT 90s = MIN
R OFF - ++ ON(1)
G OFF - +++ OFF (0)
B OFF ++ OFF (0)
SERVICE ROFF 1 |———~ 1° ON
1000
0. OFF
4) Connect an oscilloscope to CN703 Pin® (R
OUT) of C board and ground.
5) Select SPIX with{1Jand {4}.
6) Adjust with [3]and|6|for the 2.00.05 Vp-p.
White }
2 0005 Vp-p
7) Write the memory by pressing |MUTING| then
ENTER] .
8) Return the following back to normal after
adjustment.
PICTURE «vr MAX
BRIGHT =o" *° CENTER
COLOR gece? CENTER
R OFF + ON
G OFF ss ON
B OFF seeee oe ON
ona 7,