A Board Adjustments - Sony KV-20V50 Service Manual

5-2. A BOARD ADJUSTMENTS

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.
1 . Input a color-bar signal.
2 . Set to Service adjustment Mode.
3 . Connect a frequency counter to base of Q550 (TP-
86 H.DRIVE).
4 . Call the item of AFC, set to 3 level (free run).
5 . Select HFRE withmand@.
6 . Adjust with@andHfor the 15734+ 60Hz.
7 . Call the item of AFC again, adjust the level" 0 ".
8 . Write into the memory by pressing (MUTINGlthen
ADJUSTMENT
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 withmand1.
5. Adjust withHandHfor the 55 f0.5Hz.
6. Write the memory by pressingmlthen
.
JU
TRAP AD STMENT
1. Connect * " y+c cable"to Y input of S Video,
* Must prepare " y+c cable"by connecting C to Y in
the middle.
Note : Set CROM average data at 26 if S-video input
is impossible.
2. Set to Service adjustment Mode.
3. Connect an oscilloscope CN703 Pin0 (R OUT) of
C board ground.
4. Select CROM withIandm.
5. Adjust withmandBor the 0 level.
Element of sub-carrier
R-OUT
I
6. Write the memory by pressingIMUTING]then
1. Input a color-bar signal.
2. Set to Service adjustment Mode.
3. Set the conditions as follows.
PICTURE MAX
. . . . . . . . . ,,,,,N
COLOR
. . . . . . . . . ,,,,,N
BRIGHT
......... ON (1)
R OFF
......... OFF (0)
......... OFF (0)
B OFF
S E R V I C E R O F F
1
1000
4. Connect an oscilloscope to CN703 Pin0
OUT) of C board and ground.
5. Select SPIX withIandH.
6. Adjust withmandHfor the 2.01tO.O5Vp-p.
7. Write the memory by pressingmlthell
8. Return the following back to normal after
adjustment.
......... MAX
PICTURE
......... CENTER
B R I G H T
......... CENTER
COLOR
......... ON
R OFF
......... ON
......... ON
B OFF
(R