TM 11-5805-424-15/NAVELEX 0967-220-9010/TO 31W2-2G-41
2-8.1. Equipment Alteration
(2) This alteration must be retracted, and the
altered circuits returned to their original condition before
returning the modem to stock.
NOTE
This special purpose alteration will
b. Strapping on the MX-73(*)/G.
be applied only to modems installed
(1) Strapping options for connector P1 (figs.
in oversea AUTODIN ASC's.
(a) Pins 13 and 14 (n and w on Assembly A8) are
a. Disabling the TALK-REQUEST ALARM Circuit.
connected together when the MD-674(P)/G is connected
to any equipment that sends a positive mark signal.
(1) Where the TALK-REQUEST ALARM
This is the normal case and the MD-674(P)/G is
function is not needed, it may be deactivated as follows:
strapped in this manner when received by the field.
(a) On PC board A6 locate R23.
(b) Pins 14 and 15 (s and w on Assembly A8) are
(b) Unsolder and lift one end of R23,
connected together when the MD-674(P)/G is connected
and insulate this free end.
to any equipment that sends a negative mark signal.
(c) Short the TALK-REQUEST RESET
(c) This strapping option is available only in the receive
switch 1A1S4 by soldering a short wire strap across its
circuits of the MD-674(P)/G. For complete interface for
terminals.
equipment that utilizes a negative mark signal, a
(d) Place a note or tag on the modem
strapping option must also exist in the receive circuits of
to indicate that it has been altered to disable the TALK-
that equipment.
REQUEST ALARM.
Change 5
2-13
