Level Adjustment Of The Vbs Signal; (Only When Hkcu-951 Is Installed) - Sony HDCU-950 Installation And Maintenance Manual

2-5-4. Level Adjustment of the VBS Signal

(only when HKCU-951 is installed)

Adjust the level of the VBS signal output from the unit
using the color bar signal.
Use the switch on the EN-145 board (HKCU-951) and the
control on the panel of the unit for adjustment.
How to adjust using the EN-145 board (HKCU-
951) of the unit
VBS LEVEL control
VBS SYNC control
VBS CHROMA control
1. Check the switch S107-3 on the EN-145 board to OFF.
Factory setting : OFF
2. Press the BARS button of the MSU-700A/750, RCP-
700 series, etc. to display the color bars on the wave-
form or vector monitor.
HDCU-950 IMM
RV204
1
1
RV201
S107
EN-145 board (A side/panel side)
3. Set the VBS LEVEL and the VBS SYNC control on
the EN-145 board panel to their mechanical center.
Then adjust RV201 (VBS GAIN) and RV204 (SYNC)
in the EN-145 board so that the color bar signal has the
specified amplitude.
Measurement point : VBS OUT connector on the
HDCU rear panel
A = 100 ± 1 IRE [for NTSC]
Specifications :
A = 700 ± 7 mV p-p [for PAL]
(VBS LEVEL control)
B = 40.0 ± 0.4 IRE [for NTSC]
B = 300 ± 3 mV p-p [for PAL]
(VBS SYNC control)
[for NTSC]
B
Adjust the VBS CHROMA control on the EN-145 board
panel until every spots of the color bar signal fall into the
specified locations "4" on vectorscope.
[for NTSC]
R
M
G
Y
L
B
G
C
Y
2-5. Video Signal System
[for PAL]
A
B
[for PAL]
R
M
G
Y
L
B
G
C
Y
2-17 (E)
A