Agc (Video Block); Y-Emphasis (Video Block); Y/C Separation (Video Block); Chroma Emp (Video Block) - Samsung VP-A12 Service Manual

Alignment and adjustment

1. AGC (Video block)

1) Rec, 100% color bar signal.
2) TP201 and EVR.
3) Confirm the Ò1. AGCÓ mode by pressing the
ÒSTILLÓ (MODE CHANGE) button of remote
control.
4) Connect an oscilloscope to TP201.
5) Press the ÒREW (DATA DOWN)/F.F (DATA UP)Ó
button so that the TP201 is 0.5 ± 0.02Vp-p
from SYNC tip to peak level.
6) Be sure to press the ÒSTART/STOP (CONFIRM)Ó
button on remote control to memorize setting.

2. Y-EMPHASIS (Video block)

1) Rec, 100% color bar signal.
2) TP202 and EVR.
3) Confirm the Ò2. Y-EMPHASISÓ mode by pressing
the ÒSTILLÓ (MODE CHANGE) button of remote
control.
4) Connect an oscilloscope to TP202.
5) Press the ÒREW (DATA DOWN)/F.F (DATA UP)Ó
button so that the TP202 is 0.5 ± 0.02Vp-p
from SYNC tip to peak level.
6) Be sure to Press the ÒSTART/STOP (CONFIRM)Ó
button on remote control to memorize setting.
5-24

3. Y/C Separation (Video block)

1) Rec, 100% color bar signal.
2) Pin 2 of IC201 and VR301, EVR.
3) Confirm the Ò3. Y/C SEPÓ mode by pressing the
4) Connect an oscilloscope to pin 2 of IC201.
5) Adjust VR301 to minimize the residual chroma
6) Press the ÒREW (DATA DOWN)/F.F (DATA UP)Ó
7) Adjust VR301 to minimize the residual chroma
8) Be sure to Press the ÒSTART/STOP (CONFIRM)Ó
0.5 0.05Vp-p

4. CHROMA EMP (Video block)

Ò4. CHROMA EMPÓ Adjustment is fixed to EVR
data A2.
5. Y-FM Carrier Frequency (Video block)
1) Rec, no signal input
2) TP203 and EVR
3) Confirm the Ò5. CARRIERÓ mode by pressing the
4) Connect frequency counter probe to TP203.
5) Press the ÒREW (DATA DOWN)/F.F (DATA UP)Ó
6) Be sure to Press the ÒSTART/STOP (CONFIRM)Ó
0.5 0.02Vp-p
ÒSTILLÓ (MODE CHANGE) button of remote
control.
component.
button so that the pin 2 of IC201 minimize the
residual chroma component.
component.
button on remote control to memorize setting.
ÒSTILLÓ (MODE CHANGE) button of remote
control.
button so that the TP203 is 4.38 ± 0.02MHz.
button on remote control to memorize setting.
MINIMAZE
Samsung Electronics