Sony CCU-TX7 Service Manual page 72

4-6-3. RX PROMPT VIDEO RF AGC
Adjustment
Note : When performing this adjustment, the TRIAX cable
50 m to 150 m should be used.
Adjustment of CA-TX7 /TX7P must be completed.
Equipment : Oscilloscope,
Video signal generator (10 STEP signal)
To be extended : CT-181 board
Preparation :
. S1 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
. S6 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
. Connect CN8 and CN3 on the CT-181 board. (CCU-TX7/
TX7P)
. S2002 (TX ↔ RX)/CT-181 board (CCU-TX7/TX7P)
. S1 (MODE AUTO/MAN)/YD-26 board (CCU-TX7/TX7P)
. Input the 10 STEP (sub-carrier : ON) signal of the video
signal generator to PROMPTER connector on the CA-TX7/
TX7P rear panel.
Test point : PROMPTER VIDEO IN connector
(CCU-TX7/TX7P rear panel)
Note : To measure the video level, make 75 Z
termination on the waveform monitor side.
Adjusting point : 1RV22 (RF AGC DLY)/CT-181 board
Adjustment Procedure :
. Turn 1RV22 (RF AGC DLY)/CT-181 board fully in the
clockwise direction, and then turn it slowly in the
counterclockwise direction so that the V SYNC position
of waveform becomes flat. (Take care not to over-turn.)
4-26
Note : After this adjustment is completed, set the switches
as follows.
. S1 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
. S6 (AUX/PROMPT)/YD-25 board (CA-TX7/TX7P)
. Connect CN7 and CN3 on the CT-181 board. (CCU-TX7/
TX7P)
. S2002 (TX ↔ RX)/CT-181 board (CCU-TX7/TX7P)
→ "AUX"
→ "AUX"
→ "RX"
→ "AUTO"
→ "PROMPT"
→ "PROMPT"
CT-181 Board
(A SIDE)
→ "TX"
CCU-TX7 (E)/V1