Sony CCU-700A, Руководство по обслуживанию

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3-44
CCU-700A
CCU-700AP
minimum
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
:
1
RV501 (INCOM 2 LEVEL)/
AT-88 board
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 1 RV501 (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.
3-8-9. MIC 1 Demod. Adjustment
Rank
: C
Note
: Perform the adjustment only when
replacing
1
T201/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.
• S1003 (MIC 1 GAIN) switch/AT-88 board
→
“MIN”
Test point
: TP8 (GND: E10)/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
1
T201/AT-88 board slowly so
that the DC level at TP8 (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
T201/AT-88 board so that the
sine-wave is minimum.
4. Repeat procedure 2.
3-8. TRIAX Interface System Adjustment
200 ± 10 mV p-p
1.24 ± 0.01 V dc
GND