Rx Prompt Video Level Adjustment; Triax Interface System Adjustment; Frequency Set Adjustment - Sony CCU-TX7 Service Manual

4-6-4. RX PROMPT VIDEO Level Adjustment

Note : When performing this adjustment, the TRIAX less
than 300 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 signal (sub-carrier : ON) of the video
signal generator to PROMPTER OUT connector on the
CA-TX7/TX7P real 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 : 1RV23 (PROMPT LEVEL)/CT-181
board.
A = 140 ± 6 IRE
A = 1.00 ± 0.05 V
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-TX-7/TX7P)
CCU-TX7 (E)/V1
→ "AUX"
→ "AUX"
→ "RX"
→ "AUTO"
[For NTSC]
[For PAL]
A
→ "PROMPT"
→ "PROMPT"
→ "TX"

4-7. TRIAX Interface System Adjustment

4-7-1. Frequency Set Adjustment

Note : Check to see that no signal is input to the INCOM
connector and PGM connector on the CCU-TX7/
TX7P rear panel or the CCU-TX7/TX7P front panel.
Perform the adjustment only when replacing the
following part on AA-90 board.
LV1, 21, 41, 81, D2, 22, 42, 62
Equipment : Frequency counter, Digital voltmeter
To be extended : AA-90 board
Adjustment Procedures :
1. Remove the ES-20 and CT-181 boards.
2. Turn on the power switch "ON".
3. AA-90 board (GND : E1)
Test point
PGM TP5
INCOM TP3
H CONT TP1
CCU DATA TP2
Setting after Adjustment :
Install the ES-20 and CT-181 boards back into position.
CT-181 Board
Adj. point Specifications
4.300 ± 0.005 MHz
1LV81
3.600 ± 0.005 MHz
1LV41
3.000 ± 0.005 MHz
1LV1
2.500 ± 0.005 MHz
1LV21
(A SIDE)
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