Incom 1 Demod. Adjustment; Incom 1 Level Adjustment - Sony CCU-700A Maintenance Manual

3-8. TRIAX Interface System Adjustment

3-8-5. INCOM 1 Demod. Adjustment

Rank: C
Note:
Perform the adjustment only when
replacing 1T401/AT-88 board.
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Preparation
• MIC 1 (ON/OFF) switch/BVP rear panel → "ON"
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
Test point:
TP14 (GND: E1)/AT-88 board
Adjustment Procedure
1. Feed the 1kHz, 220mVp-p sine-wave to pin 54 (X) and
pin 55 (GND)/extension board (BVP camera).
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust a white core of 1T401/AT-88 board slowly so
that the DC level at TP14 (GND: E1) is 1.24 ±0.02 V dc.
GND
3. Set the input range of oscilloscope to AC mode, and
adjust a blue core of 1T401/AT-88 board so that the
sine-wave is minimum.
4. Repeat procedure 2.
3-42

3-8-6. INCOM 1 Level Adjustment

Rank:
Equipment:
To be extended:
Preparation
• MIC 1 (ON/OFF) switch/BVP rear panel → "ON"
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
Test point:
Adjusting point:
Adjustment Procedure
1. Feed the 1kHz, /220mVp-p sine-wave to pin 54 (X)
and pin 55 (GND)/extension board (BVP camera).
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust 1RV401 (INCOM 1 LEVEL) on the AT-88
board so that the signal level at TP15 (GND: E12) on
the AT-88 board is 200 ±10 mV p-p.
1.24 ± 0.02 V dc
minimum
B
Oscilloscope, Audio generator
AT-88 board
TP15 (GND: E12)/AT-88 board
1RV401 (INCOM 1 LEVEL)/
AT-88 board
200 ± 10 mV p-p
CCU-700A
CCU-700AP