RTS MCS-325, Manual

Page: 48 / 114

4-10
M C E - 3 2 5 U s e r I n s t r u c t i o n s
Panel Mic to Channel Test
1
Turn all front panel buttons off. Set all volume controls to minimum.
2
Remove the signal from the Four-Wire B input and reconnect it to the panel mic input (J28 tip
and ring, it is easiest to connect to the back of the connector.).
3
Set the signal generator to –25 dBu, 1 kHz.
4
Turn on the CH 1 TALK, MIC ON and PANEL MIC buttons.
5
Check the channel 1 output. It should be –0.9 dBu ±2 dBu.
Carbon Mic to Channel Test
1
Turn off the PANEL MIC and MIC ON buttons. (Only the CH 1 TALK LED should be on.)
2
Connect a 470 ohm resistor across the CARBON MIC HEADSET jack (J3 tip and ring). The
MIC ON LED should turn on.
3
Remove the signal from the panel mic input, and reconnect it to the CARBON MIC
HEADSET jack.
4
Set the signal generator to 11.2 dBu, 1 kHz.
5
Check the channel 1 output. It should be –0.9 dBu ±2 dBu.
6
Remove the 470 ohm resistor from the carbon mic input.
VOX Test
1
Remove the signal from the CARBON MIC HEADSET jack, and reconnect it to the DYN
MIC HEADSET jack mic input (J2 pins 1 & 2).
2
Set the generator to –45 dBu, 1 kHz.
3
Set DIP switch DS8 to the on position (VOX enabled), and note that the MIC ON LED turns
on.
4
Adjust the signal generator output level to zero, and note that the MIC ON LED turns off.
5
Reset DS8 to off.
Mic Kill Receive Test
1
Set all buttons to off.
2
Remove the signal from the DYN MIC HEADSET jack mic input, and reconnect it to intercom
channel 1.
3
Adjust signal generator to –5 dBu, 24 kHz (check frequency with frequency counter).
4
Set the MIC ON button to on.
5
Activate the CH 1 TALK button. The MIC ON LED should turn off.
6
Attenuate the signal input by 20 dB. Try turning on the MIC ON button. It should not turn on.
7
Attenuate the signal an additional 10 dB. Try turning on the MIC ON button. It should turn on.
8
Adjust signal generator to –5 dBu at 22.320 kHz.
9
Try turning the MIC ON button on and off. It should turn on and off as usual.
10
Adjust the signal generator to –5 dBu at 23.520 kHz.