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3-8. TRIAX Interface System Adjustment
3-8-11. MIC 2 Demod. Adjustment
Rank:
C
Note:
Perform the adjustment only when
replacing 1T301/AT-88 board.
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Preparation
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
• S1004 (MIC 2 GAIN) switch/AT-88 board → "MIN"
Test point:
TP11 (GND: E10)/AT-88 board
Adjustment Procedure
1. Feed the 1 kHz, 220 mV p-p sine-wave to pin 60 (X),
pin 59 (Y) and pin 61 (GND)/extension board (BVP
camera).
...Fig-2 (Refer to 3-1-4. Audio connection.)
2. Adjust a white core of 1T301/AT-88 board slowly so that
the DC level at TP11 (GND: E10) is 1.24 ±0.01 V dc.
GND
3. Set the input range of oscilloscope to AC mode, and
adjust a blue core of 1T301/AT-88 board so that the
sine-wave is minimum.
4. Repeat procedure 2.
3-46
3-8-12. MIC 2 Level Adjustment
Rank:
Equipment:
To be extended:
Preparation
• Extend the AU-177 board (BVP camera) with extension
board EX-439.
• S1004 (MIC 2 GAIN) switch/AT-88 board → "MIN"
Test point:
Adjusting point:
Adjustment Procedure
1. Feed the 1 kHz, 220 mV p-p sine-wave to pin 60 (X),
pin 59 (Y) and pin 61 (GND)/extension board (BVP
camera).
...Fig-3 (Refer to 3-1-4. Audio connection.)
2. Adjust 1RV301 (MIC 2 LEVEL) on the AT-88 board
so that the signal level at TP13 (GND: E12) on the
AT-88 board is 1100 ±50 mV p-p.
1.24 ± 0.01 V dc
minimum
B
Oscilloscope, Audio generator
AT-88 board
TP13 (GND: E12)/AT-88 board
1RV301 (MIC 2 LEVEL)/
AT-88 board
1100 ± 50 mV p-p
CCU-700A
CCU-700AP
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