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3-7. PROMPT VIDEO Cable
Compensation System Adjustment
3-7-1. TX PROMPT VIDEO Demodulation
Adjustment
Rank:
B
Note:
When adjusting this step, the length of
triaxial cable is required less than 500 m.
Equipment:
Oscilloscope, Video signal generator
To be extended:
DM-94 board
Preparation
• S4 (CCU → CAM/CAM → CCU)/
MD-83 board (BVP side) → "CCU → CAM"
• Connect the harness of MPX filter to CN35 (PROMPT)
connector on DM-97 board (BVP side).
• Feed the 10 STEP signal from the video signal generator
to PROMPTER connector (CCU rear panel).
• S5 (TX← → RX)/
DM-94 board (CCU-700A/700AP) → "TX"
• S6 (TX← → RX)/
DM-94 board (CCU-700A/700AP) → "TX"
• S1 (MODE AUTO/MAN)/
DM-94 board (CCU-700A/700AP) → "MAN"
• S2 (CABLE LENGTH)/
DM-94 board (CCU-700A/700AP) → "1"
Test point:
Board suffix-12 only
Center pin of S6 switch
(GND: E13)/DM-94 board
Board suffix-13 and higher
TP22 (GND: E13)/DM-94 board
1RV21 (PROMPT TX DEV)/
Adjusting point:
A = 25 ±3 %
Specification:
Adjustment Procedure
• Adjust 1RV21 so that the level "A" is 25 ±3% when the level
"B" is 100% with using VAR control of the oscilloscope.
Note: After the adjustment, set as follows.
• S1 (MODE AUTO/MAN)/
DM-94 board (CCU-700A/700AP) → "AUTO"
• S2 (CABLE LENGTH)/
DM-94 board (CCU-700A/700AP) → "0"
CCU-700 A
CCU-700AP
3-7-2. TX PROMPT VIDEO BPF Adjustment
Rank:
Note:
Equipment:
To be extended:
Preparation
• S4 (CCU → CAM/CAM → CCU)/
• Connect the harness of MPX filter to CN35 (PROMPT)
connector on DM-97 board (BVP side).
• Feed the 10 STEP signal from the video signal generator
to PROMPTER connector (CCU rear panel).
• S5 (TX← → RX)/
• S6 (TX← → RX)/
• S1 (MODE AUTO/MAN)/
• S2 (CABLE LENGTH)/
Test point:
Adjusting point:
DM-94 board
B=100%
_
+
A=25 3%
Adjustment Procedure
• Adjust 1CV2 and 1CV3 alternately so that the level
"A" is maximum.
Note: After the adjustment, set as follows.
• S1 (MODE AUTO/MAN)/
• S2 (CABLE LENGTH)/
3-7. PROMPT VIDEO Cable Compensation System Adjustment
C
Make sure that "3-7-1. TX PROMPT
VIDEO Demodulation Adjustment"
is done.
When adjusting this step, the length of
triaxial cable is required less than 500 m.
Oscilloscope, Video signal generator
DM-94 board
MD-83 board (BVP side) → "CCU → CAM"
DM-94 board (CCU-700A/700AP) → "TX"
DM-94 board (CCU-700A/700AP) → "TX"
DM-94 board (CCU-700A/700AP) → "MAN"
DM-94 board (CCU-700A/700AP) → "1"
Board suffix-12 only
Center pin of S6 switch (GND:
E13)/DM-94 board
Board suffix-13 and higher
TP22 (GND: E13)/DM-94 board
1CV2 (PROMPT TX FREQ 1)/
1CV3 (PROMPT TX FREQ 2)/
DM-94 board (CCU-700A/700AP) → "AUTO"
DM-94 board (CCU-700A/700AP) → "0"
DM-94 board
DM-94 board
A
3-35
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