4-24
CCU-TX7 (E)/V1
4-6. PROMPT VIDEO Cable
Compensation System Adjustment
4-6-1. TX PROMPT VIDEO Demodulation
Adjustment
Note :
When performing this adjustment, the TRIAX cable
less than 300 m should be used.
Equipment
:
Waveform monitor,
Video signal generator (10 STEP signal)
To be extended :
CT-181 board
Preparation :
.
S1 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
→
"PROMPT"
.
S6 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
→
"PROMPT"
.
Connect CN7 and CN3 on the CT-181 board. (CCU-TX7/
TX7P)
.
S2002 (TX
↔
RX)/CT-181 board (CCU-TX7/TX7P)
→
"TX"
.
S1 (MODE AUTO/MAN)/YD-26 board (CCU-TX7/TX7P)
→
"AUTO"
.
Input 10 STEP signal (sub-carrier : OFF) of video signal
generator to PROMPT VIDEO IN connector (75
Z
termination, 1.0 V p-p) on the CCU-TX7 /TX7P rear panel.
Test point :
PROMPTER OUT (CA-TX7/TX7P)
Note : To measure the video level, make 75
Z
termination on the waveform monitor side.
Adjusting point :
1
RV21 (PROMPT DEV)/
CT-181 board
Specification
:
A = 140
±
6 IRE [For NTSC]
A = 1.00
±
0.05 V [For PAL]
Note :
After this adjustment is completed, set as follows.
.
S1 (MODE AUTO/MAN)/YD-26 board (CCU-TX7/TX7P)
→
"AUTO"
A