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3-10. 2W Intercom System Adjustment
3-10. 2W Intercom System Adjustment
3-10-1. ENG Level Adjustment
n
• Perform the following adjustment to much the input
level of the camera system.
Rank:
C
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Preparation
• S2491 (INCOM 1 SELECT)/AT-88 board → "2W"
Test point:
TP46 (GND: E11)/AT-88 board
Adjustment Procedure
1. Feed the 1 kHz, 1 V p-p sine-wave to pin D71 (X) and
pin B72 (GND)/extension board.
...Fig-1 (Refer to 3-1-4. Audio connection.)
2. Adjust 1RV2451 (ENG 2W LEVEL)/AT-88 board so
that the audio level at TP46 (GND: E11)/AT-88 board
is 200 ±10 mV.
3-50
3-10-2. ENG CANCEL Adjustment
n
• Perform the following adjustment to much the input
level of the camera system.
Rank:
Equipment:
To be extended:
Preparation
• MIC switch/CCU front panel → "CARBON"
• INCOM (PROD/PRIV/ENG) switch/
• S2491 (INCOM 1 SELECT)/AT-88 board → "2W"
• Connect between pin D71 and pin B72/extension board
with 600 Z resistor.
Test point:
Adjustment Procedure
1. Feed the 1 kHz, 200 mV p-p sine-wave to INCOM
connector (CCU-700A/700AP).
2. Adjust 1RV2452 (ENG 2W CANCEL)/AT-88 board
so that the audio level at TP46 (GND: E11)/AT-88
board is minimum.
200 ± 10 mV p-p
C
Oscilloscope, Audio generator
AT-88 board
AT-88 board panel → "ENG"
TP46 (GND: E11)/AT-88 board
Less than
40 mV p-p
CCU-700A
CCU-700AP
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