Sony CCU-700A, Руководство по обслуживанию

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3-46
CCU-700A
CCU-700AP
1100 ± 50 mV p-p
minimum
3-8-12. MIC 2 Level Adjustment
Rank
: B
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 : TP13 (GND: E12)/AT-88 board
Adjusting point
:
1
RV301 (MIC 2 LEVEL)/
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-3 (Refer to 3-1-4. Audio connection.)
2. Adjust
1
RV301 (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.
3-8-11. MIC 2 Demod. Adjustment
Rank
: C
Note
: Perform the adjustment only when
replacing
1
T301/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
1
T301/AT-88 board slowly so that
the DC level at TP11 (GND: E10) is 1.24
±
0.01 V dc.
3. Set the input range of oscilloscope to AC mode, and
adjust a blue core of
1 T301/AT-88 board so that the
sine-wave is minimum.
4. Repeat procedure 2.
3-8. TRIAX Interface System Adjustment
1.24 ± 0.01 V dc
GND