Adjusting L oop Current Internal/External Switch

TM 11-5805-387-20-2

d. Preliminary Servicing and Adjustment of Equipment

Make initial adjustments after installing modem but before beginning routine operation,

NOTE

The following adjustments can only be made with modem chassis removed

from its case (para 2-9).

e. Adjusting L oop Current Internal/External Switch

. Current for dc loop No. 1 and dc loop No. 2 may be supplied by internal loop battery module

A5 (see figure) or by external means.

CHASSIS INTERIOR, TOP VIEW

Internal/External switch A5S1 is a screwdriver adjustment on top of module A5 which sets the

appropriate sources of current for dc loops No. 1 and No. 2. See figure for settings provided.

A5S1 is normally set at LOOP 1 AND 2 INT when modem is shipped from the factory.

Set A5S1 according to desired sources of loop current for dc loops No. 1 and 2.

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