Intercom System Adjustment; Incom (T) Level Set; Incom (R) Level Set - Sony CCU-700A Maintenance Manual

3-9. Intercom System Adjustment

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: 1RV2301 (FRONT MIC GAIN)/
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 1RV2301 (FRONT MIC GAIN)/AT-88 board
so that the video level at TP45 is 200 ±10 mV p-p.
3-48

3-9-2. INCOM (R) Level Set

Rank:
Equipment:
To be extended:
Preparation
• INCOM (PROD/PRIV/ENG) switch/CCU front panel
→ "PROD"
• INCOM control/CCU front panel → Fully clockwise 2
Test point:
AT-88 board
Adjusting point:
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.
...
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. 1RV2310 (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.
200 ± 10 mV p-p
C
Oscilloscope, Audio generator
AT-88 board
Pin A67 (GND: pin D66)/
1RV2310 (INCOM FP LEVEL)/
Fig-1 (Refer to 3-1-4. Audio connection.)
extension board
AT-88 board
9.0 ± 0.5 V p-p
CCU-700A
CCU-700AP