Int Sc Phase Adjustment; Y Clamp Adjustment - Sony CCU-TX7 Service Manual

4-2-5. INT SC Phase Adjustment

Note : The SC-H phase measurement equipment (Tektronix :
Waveform monitor 1765 or equivalent) is used for
this adjustment. In case of using another measurement
equipment, read its instruction manual carefully and
then perform the following adjustment.
Equipment : SC-H phase measurement equipment
To be extended : ES-20 board
Preparation :
. Set the mode of Textronix 1765 to "SC-H" mode.
. Make sure that the video signal is not inputted to the GEN
LOCK connector on the CCU-TX7/TX7P rear panel.
Test point : VBS 1 OUT/CCU rear panel
Adjustment Procedure :
. Adujst 1RV5 (SC-H PHASE)/ES-20 board so that the
luminance line of BURST (SC) is the same as following
figure.
[For NTSC] [For PAL]
g
R
M
G
Y
L
B
G
Cy
Note : After this adjustment is completed, set the mode of
Tektronix Waveform monitor 1765 to "WFM" mode.
SYNC WIDTH
RV3
ES-20
PHASE RV2
RV7
H PHASE
H
SYNC PHASE
SC RV6
SC PHASE
TP1
RV4
0
SC FREQUENCY
180°
RV5
OUT PUT 1
SC-H PHASE
R/G/B
Y/R-Y/B-Y
E1
Y/C
OUT PUT 2
G MAT BAL2
R/G/B
S1
RV506
Y/R-Y/B-Y
Y/C
TP501
RV508
RV507
G MAT BAL1
G LEVEL
RV511
R DC BAL
RV510
R LEVEL
RV514
B DC BAL RV513
B LEVEL
CCU-TX7 (E)/V1
cy
R
g
M
G
V
75%
100%
Y
b
L
U
yl
B
G
Cy mg
r
Y LEVEL (VBS)
SYNC LEVEL (VBS)
RV803
RV800 RV801
SYNC LEVEL(COMP)
Y SETUP LEVEL
(NTSC ONLY)
B-Y LEVEL
B WHT BAL R WHT BAL
RV505 RV500
TP502 R-Y BLK BAL
RV501
R MAT BAL
RV509
TP503 R-Y GAIN ADJ
RV502
B MAT BAL
RV512 RV1000
RV504 RV503
B-Y GAIN ADJ B-Y BLK BAL

4-2-6. Y CLAMP Adjustment

Equipment
To be extended : ES-20 board
Preparation :
. Select the BARS mode on the RCP-TX7 or COU-TX7.
Test point
Adjusting point : 1RV515 (Y CLAMP)/ES-20 board
Specification
[For NTSC]
A
RV804
CHROMA LEVEL
RV802
RV810
E3
Y LEVEL(COMP)
RV812
TP7
TP5
POSITION TP4
TP2
TP3
LEVEL
ES-20 Board
(A SIDE)
: Oscilloscope
: TP507 (GND : E1)/ES-20 board
: A = 0 ± 5 mV
[For PAL]
A
4-5