3-42
CCU-700A
CCU-700AP
200 ± 10 mV p-p
3-8-5. INCOM 1 Demod. Adjustment
Rank
:
C
Note
:
Perform the adjustment only when
replacing
1
T401/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
1
T401/AT-88 board slowly so
that the DC level at TP14 (GND: E1) is 1.24
±
0.02 V dc.
3.
Set the input range of oscilloscope to AC mode, and
adjust a blue core of
1
T401/AT-88 board so that the
sine-wave is minimum.
4.
Repeat procedure 2.
1.24 ± 0.02 V dc
GND
3-8-6. INCOM 1 Level Adjustment
Rank
:
B
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
:
TP15 (GND: E12)/AT-88 board
Adjusting point
:
1
RV401 (INCOM 1 LEVEL)/
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
1
RV401 (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.
3-8. TRIAX Interface System Adjustment
minimum
