TM 11-5805-715-34/EE119-DB-MMI-010-E154 CV3478/TO 31W2-2TTC39-12
spare and unused connections on the logic
3-14. Wire Wrap Post Replacement
diagrams do not appear in the tables.
identified the signals at connector and circuit card
Do not insert bushing and post
(1) The connector reference designators
(1) are horizontally in alphanumerical sequence.
Item (2) lists the connectors in alphanumerical se-
a. Insert nylon bushing into proper hole and
quence for quick identification of the connectors
gently tap bushing with insertion tool Teradyne No.
contained on that page and to allow rapid scanning
600-0004-000 for a snug press fit with bushing level
of the pages for location of the appropriate con-
to the other bushings.
b. Place post on insertion tool forks and
(2) The pin no. column 3 is arranged
insert into nylon bushing, making sure that the post
in numerical sequence and identifies the connector
fork is oriented in the same direction as all the
pin numbers. This column identifies the signal
other posts. Ensure that the post is in the bushing
name associated with a particular logic circuit card
connector for each pin. The signal information is
the bushing by tapping the tool until the shoulder of
read from right to left.
the tool strikes the bushing.
(3) The horizontal column (4) identifies
c. A wire removed and tagged in paragraph
the printed circuit card type code. For example, the
3-15 should not
be reused unless there
first NIU-A column identifies the signal names for
excess length to allow cutting off the stripped end
each pin of the NIU-A connector XA0002. Refer to
and re- stripping for wire wrapping. Replace the
to associate the card code with its part
entire wire if necessary using wire wrap gun NSN
(4) Identification of the abbreviations
used in the tables:
*in the PIN NO.
indicates multiple connections exist at the identified
More than one wire may have to be com-
pletely replaced when removing a wire
(b) N as a last character in the signal
name indicates signal negation (low).
(c) A as last character in the signal
3-15. Signal String List and Signal
name indicates A bus.
(d) B as last character in the signal
name indicates B bus.
This paragraph contains the basic information
(e) R as last character in the signal
name indicates ring.
for troubleshooting. The ballooned numbers in the
(f) T as last character in the signal
tables are used only for reference to the following
name indicates tip.
definitions and explanation. It is extremely impor-
(g) J indicates jack type connector.
tant that the steps in the subparagraphs for using
(h) XA indicates circuit card type
the string list and signal location tables be strictly
connector followed by slot and pin reference
adhered to. Any deviation from these sequential
designator; for example:
steps could lead to confusion and the false
assumption that the tables contain errors in signal
name identification. Some names for the same
Card slot 2
signal may differ between the logic diagrams and
the tables; however, the names are consistent
within the string list and signal location tables. The
reasons some signal names differ between the
and fig. FO-6
logic diagrams and the tables are as follows: a logic
card may be used in different slots and/or twisted
pair cables necessitate a variation in the signal
names. Test points or
Row (not applicable)