GAI-Tronics MI05-101 Merge / Isolate Cabinet with External Option - Manual (Page 9)

Pub. MI05-101iom.2
Model MI05-101 Merge/Isolate Cabinet Page: 9 of 24
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01/09
3. Adjust the applicable potentiometer on the Audio Switching PCBA for each zone to achieve a
reading of 33 ohms on the ohmmeter. Refer to the chart below for the correct potentiometer for each
zone.
Zone Potentiometer
Zone 1 R2
Zone 2 R5
Zone 3 R8
Zone 4 R11
Zone 5 R17
Line Balance for Party Lines
The Model MI05-101 Merge/Isolate Cabinet provides line balancing for all system party lines. No user
adjustments are required for the party lines unless the party lines are made common and an external
device such as the Model 10959-103 Audio Messenger Interface with telephone interface circuits, or the
Model GTK99019 External Audio Interface, is used with the system. If party line 4 and/or 5 is used for
either the Audio Messenger Interface or the External Audio Interface, the line balance must be removed
because each device provides the necessary line balancing for the designated party line.
To disable the internal line balance for either party line 4 and/or 5, refer to the following table:
Party
Line Jumpers
Enable
Internal Line Balance
Disable
Internal Line Balance
4 JB51 and JB52 Jumper pins 1 and 2 Jumper pins 2 and 3
5 JB53 and JB54 Jumper pins 1 and 2 Jumper pins 2 and 3