3-48
CCU-700A
CCU-700AP
9.0 ± 0.5 V p-p
3-9-2. INCOM (R) Level Set
Rank
:
C
Equipment
:
Oscilloscope, Audio generator
To be extended
:
AT-88 board
Preparation
• INCOM (PROD/PRIV/ENG) switch/CCU front panel
→
“PROD”
• INCOM control/CCU front panel
→
Fully clockwise
2
Test point
:
Pin A67 (GND: pin D66)/
extension board
Adjusting point
:
1
RV2310 (INCOM FP LEVEL)/
AT-88 board
Adjustment Procedure
1.
(For 4W intercom system)
Feed the 1 kHz sine-wave to pin C69 (X), pin D69
(Y) and pin A70 (GND)/extension board.
…Fig-2 (Refer to 3-1-4. Audio connection.)
(For 2W/RTS intercom system)
Feed the 1kHz sine-wave to pin B70 (X), pin D70
(GND)/extension board.
…
Fig-1 (Refer to 3-1-4. Audio connection.)
2.
Adjust the output of audio generator so that the level at
TP43 (GND: E1) on the AT-88 board is 200 mV p-p.
3.
1
RV2310 (INCOM FP LEVEL)/AT-88 board
→
fully
clockwise
2
.
4.
Confirm that the signal level at pin A67/extension
board is 9.0
±
0.5 V p-p.
3-9. Intercom System Adjustment
3-9-1. INCOM (T) Level Set
Rank
:
C
Equipment
:
Oscilloscope, Audio generator
Preparation
• MIC switch/CCU front panel
→
“CARBON”
Test point
:
TP45 (GND: E11)/AU-130 board
Adjusting point
:
1
RV2301 (FRONT MIC GAIN)/
AT-88 board
Adjustment procedure
1.
Connect audio generator and INCOM connector
(CCU-700A/700AP) as follows.
2.
Feed the 1 kHz, 220 mV p-p sine-wave from Audio
generator.
3.
Adjust
1
RV2301 (FRONT MIC GAIN)/AT-88 board
so that the video level at TP45 is 200
±
10 mV p-p.
3-9. Intercom System Adjustment
200 ± 10 mV p-p