AB-120 Announcer Console
AB-120 MK2 (2019 onwards) Jumper setting locations
Jumper Options
There are eleven two position jumpers that provide many options for the operation of the AB-
120. To access these jumpers, remove the bottom cover of the unit. Inside the bottom cover is
a label describing the functions of jumper and switch.
Note:
Jumpers JP2, JP3, JP4 and JP6 are not used.
JP1 (Intercom Termination)
JP1 provides termination for the intercom line if needed. The AB-120 is always a remote
intercom station and therefore does not provide termination for an intercom line. The
termination is provided for the cases where the party-line output of the AB-120 is not used
and the party-line drive circuit needs termination to be stable.
As shipped from the factory, the jumper is between pins 1 and 2 of JP1 making the
termination inactive. To activate termination, place the jumper between pins 2 and 3.
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