CCU-590/P/V1(E)
4-35
4-7-4. RX PROMPT VIDEO RF AGC
Adjustment
Adjustment category:
B
Note:
Use a 300 m TRIAX cable for
this adjustment.
The CA-590/590P shall have
been adjusted properly.
Measuring instruments:
Waveform monitor, Video
signal generator (10 STEP
signal)
Extended board:
TR-133B board
Preparation:
n
The RX PROMPTER output terminal must be output from
RET-2/PROMPTER BNC on the CCU rear panel.
.
S2 (TX
←
REM
→
RX)/TR-133B board (CCU)
→
“RX”
.
S1 (CABLE LENGTH)/DM-140 board (CCU)
→
“F”
(AUTO)
.
Set S301 on the DM-139B board of CA-590/590P to
“TX”
.
Input 10 STEP signal from the video signal generator to
the PROMPTER terminal on the CA-590/590P rear
panel.
Measurement point:
RET-2/PROMPTER terminal
(CCU rear panel)
Adjustment point:
1
RV901 (RF AGC DLY)/TR-
133B board
Adjustment procedure:
.
Turn slowly
1
RV901 (RF AGC DLY) on the TR-133B
board counterclockwise
3
from the maximum position,
and stop it at a position where each black portion of
noise level A (see figure below) becomes minimal.
(Excessive turn causes the SYNC level to deteriorate.)
Note:
Perform the following after the adjustment is completed.
.
Set S2 (TX
←
REM
→
RX) on the TR-133B board to
TX side with POWER ON and then to REM.
.
Re-set S301 on the DM-139B board of CA-590/590P to
“RX”
.
S1 (CABLE LENGTH)/DM-140 board
→
“F” (AUTO)
.
Disconnect the BNC cable from the PROMPTER
terminal.
Where each black portion of
noise level A becomes minimal.
A
CN902
S1
S2
S363
E1
E101
E102
E300
E701
E801
LV101
LV201
LV301
LV302
LV401
LV402
LV601
LV602
LV901
LV902
RV101
RV201
RV301
RV401
RV41
RV601
RV701
RV801
RV901
RV902
TP1
TP101
TP201
TP202
TP21
TP301
TP302
TP401
TP402
TP41
TP701
TP801
TP901
A
B
C
D
E
F
G
1
2
3
4
TR-133B BOARD (SIDE A)
E100
