User manual

Clear-Com Intercom Systems MR-202/MR-204 Two- and Four-Channel Headset Stations

Rev. B

The microphone and headphone wiring in the headset cord must be

individually shielded.

Note:

Do not connect Pins 1 and 3 together. Headset extension cords or

headset “Y” cables are not recommended because they may increase

crosstalk between channels.

Internal Adjustments and Connections

The controls and connectors found inside the MR-202 and MR-204 are shown

in the following figure and described by the following text. The jumpers can be

accessed without completely removing the panel from its wall box by

removing the top two screws and loosening the bottom two screws a few

turns. The panel can then be leaned out from the wall. The jumpers will be

accessible as shown in the lower view of Figure 2 on page 5.

FIGURE 2: Internal Adjustments and Connections

View from top

of MR-202

Front Panel

P3 Must be

installed if

no option

P1 Must be

installed if

no option

JB1

JB2