1-9. Intercom System Adjustment
1-9. Intercom System Adjustment1-9-2. SIDE TONE Adjustment
1-9-1. INCOM (T) Level Set AdjustmentRank:C
Equipment:Oscilloscope, Audio generator
Rank:CTo be extended:AU-231 board
Equipment:Oscilloscope, Audio generatorPreparations:
Preparations:. S4/AU-236 board ? OCM�
. S4/AU-236 board ? OCM�. MIC switch/CCU front panel ? OMIC ON�
. MIC switch/CCU front panel ? OMIC ON�Test point:TP502 (GND: E2)/AU-231 board
Test point:TP501 (GND: E2)/AU-231 board
Adjustment point:1RV502 (FRONT MIC GAIN)/Adjustment Procedures:
AU-231 board 1. Connect the audio generator and INCOM connector/
CCU front panel as follows.
Adjustment Procedures:Audio generator
1. Connect the audio generator and INCOM connector/
CCU front panel as follows.
Audio generatorINCOM Connect
GND 600Z51
42
more than
3
INCOM Connect
47 uF/16V
_+
GND 600Z51
42
more than
3
47 uF/16V
_+2. Adjust the output level of the audio generator so that
the 1 kHz 200 mVp-p sine wave at TP501 (GND: E1)/
AU-231 board is outout.
2. Feed the 1 kHz, 220 mV p-p sine wave from the audio3. Adjust 1RV501 (SIDE TONE)/AU-231 board so that
generator.the level at TP502 (GND: E2)/AU-231 board is 20 ?4
3. Adjust 1RV502 (FRONT MIC GAIN)/AU-231 board mV p-p.
so that the video level at TP501 is 200 ?10 mV p-p.n
This specifications are for guidance when mainte-
nance.
When intercom system is practically used, adjust the
200 ?10 mV p-pside tone level to the customerOs preference.
1-40 (E)CCU-550A/550AP MMP2 |
ACEC
