Clear-Com Intercom Systems
MR-202/MR-204 Two- and Four-Channel Headset Stations
© Clear-Com Intercom Systems 2000
9
Rev. B
FIGURE 6: MR-204 Block Diagram
Troubleshooting
•
System does not operate. Talk Light does not come on when Talk
button is pressed.
Scenario 1
The MR-202 or MR-204 doesn’t have an intercom connection. If the EB-4W 4-
Wire Option Module is connected, the MR-202 may not be receiving AC
power.
Solution: Check connections and cable.
Scenario 2
The MR-202 or MR-204 has an internal failure.
Solution: Unit requires servicing.
•
Headset does not operate. Talk Light comes on when Talk button
is pressed.
Scenario 1
The headset unplugged, the Intercom Level knob is turned all the way down,
or the Channel switch set to unused channel.
Solution: Adjust controls appropriately.
EQ/
LIM
Headset
Mic
Sidetone
Null
Call
Light
Intercom
Volume
Call Send &
Receive
Headset
Output
Mic
Mute
Long Line
Talk
RMK
Microprocessor
Talk
Latch
Disable
Call
TW Option
Channel
Switch
Ch. A
Power
Ch. B
Common
+30 VDC
Ground
Ch. C
Ch. D
