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3-8. TRIAX Interface System Adjustment
3-8-8. INCOM 2 Level Adjustment
Rank:
B
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Preparation
• MIC 2 (ON/OFF) switch/BVP rear panel → "ON"
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
Test point:
TP17 (GND: E2)/AT-88 board
Adjusting point:
1RV501 (INCOM 2 LEVEL)/
Adjustment Procedure
1. Input the 1 kHz, 220 mV p-p sine-wave to pin 48 (X)
and pin 49 (GND)/extension board (BVP camera).
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust 1RV501 (INCOM 2 LEVEL) on the AT-88
board so that the signal level at TP17 (GND: E2) on
the AT-88 board is 200 ±10 mV p-p.
3-44
3-8-9. MIC 1 Demod. Adjustment
Rank:
Note:
Equipment:
To be extended:
Preparation
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
• S1003 (MIC 1 GAIN) switch/AT-88 board → "MIN"
Test point:
AT-88 board
Adjustment Procedure
1. Feed the 1kHz, 270 mV p-p sine-wave to pin 66 (X),
pin 65 (Y) and pin 67 (GND)/extension board (BVP
camera).
...Fig-3 (Refer to 3-1-4. Audio connection.)
2. Adjust a white core of 1T201/AT-88 board slowly so
that the DC level at TP8 (GND: E10) is 1.24 ±0.01 V dc.
200 ± 10 mV p-p
GND
3. Set the input range of oscilloscope to AC mode, and
adjust a blue core of 1T201/AT-88 board so that the
sine-wave is minimum.
4. Repeat procedure 2.
C
Perform the adjustment only when
replacing 1T201/AT-88 board.
Oscilloscope, Audio generator
AT-88 board
TP8 (GND: E10)/AT-88 board
1.24 ± 0.01 V dc
minimum
CCU-700A
CCU-700AP
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