Vbs Out Level Adjustment; Stair Case Adjustment - Sony CCU-TX7 Service Manual

4-2-17. VBS OUT Level Adjustment

Equipment : Waveform monitor
To be extended : ES-20 board
Preparation :
. Select the BARS mode on the RCP-TX7 or COU-TX7.
Test point : VBS 1 OUT connector/CCU rear panel
Adjusting point : 1RV813 (VBS LEVEL)/ES-20 board
: A = 100 ± 1 IRE [For NTSC]
Specification
A = 700 ± 10 mV [For PAL]
[For NTSC]
SYNC WIDTH
RV3
ES-20
PHASE RV2
RV7
H PHASE
H
SYNC PHASE
RV6
SC SC PHASE
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
[For PAL]
A
SYNC LEVEL (VBS)
RV803
RV800 RV801
SYNC LEVEL
Y SETUP LEVEL
(COMP)
(NTSC ONLY)
TP1
B WHT BAL R WHT BAL
RV505 RV500
TP502
R-Y BLK BAL
RV501
R MAT BAL
RV509
R-Y GAIN ADJ
TP503
RV502
B MAT BAL
RV512
RV504 RV503
B-Y GAIN ADJ B-Y BLK BAL

4-2-18. STAIR CASE Adjustment

Note : This adjustment is for temporary adjustment when
repairing the STAIR CASE block. In the system
set up, the readjustment is required to match the
characteristic of waveform monitor.
Equipment
To be extended : ES-20 board
Preparation :
. Select the BARS mode on the RCP-TX7.
. MONITOR SELECT button/RCP-TX7 → "SEQ"
Test point
A
Adjusting point : 1RV1001/ES-20 board
Specification
A
Y LEVEL (VBS)
RV804
CHROMA LEVEL
RV802 RV810
E3
Y LEVEL(COMP)
FL800
RV812
B-Y LEVEL
TP7
TP5
POSITION TP4
TP2
TP3
RV1000
LEVEL
ES-20 Board
(A SIDE)
: Oscilloscope
: pin 76 (GND: pin 75)/
extension board
1RV1000/ES-20 board
: A = 10.0 ± 1 V p-p (1RV1001)
B = 0 ± 1 V dc (1RV1000)
B
GND
4-11