Replacement of Digital Data Combiner lA12 Chassis

TM 11-5820-695-35

3-29.1. Replacement of Digital Data Combiner lA12

TM 11-5820-695-35 (8) As viewed from the front, slowly

Chassis (fig. 3-1 and 3-1.1)

push digital data combiner chassis from its position

inside cover.

a. Removal.

b. Replacement.

(1) Set the POWER ON/OFF Switch on

meter panel assembly lA15A8 to OFF.

(1) Insert replacement digital data combiner

(2) Disconnect cable assemblies lA15W28

lA12 chassis inside cover by carefully pushing chassis

and lA15W29 connectors 1lA15P4 and lA15P5 from the

into cover at the rear of cover until holes on bottom of

digital data combiner 1A12.

cover mate with holes at bottom of chassis.

(2) Secure digital data combiner 1A12 cover

CAUTION

and chassis together using four screws at bottom and

Do not loosen one captive screw

four screws at rear of cover removed in a(6) and a(7).

completely at one time. Completely

(3) Carefully insert plug-in components

loosening one assembly captive

lA12Al through lA12A8, removed in a(5) into their

screw at a time may damage the

respective positions as indicated on the hinged cover of

digital data combiner.

1A12.

(4) Close the hinged front cover and tighten

(3) Loosen the two assembly captive screws

the three cover captive screws securing the hinged front

securing digital data combiner 1A12 to electrical

cover.

equipment cabinet lA15 by alternately turning each

(5) Insert replacement digital data combiner

captive screw two turns at a time until the captive screw

into electrical equipment cabinet lA15.

turns freely. Withdraw Digital data combiner 1A12 from

electrical equipment cabinet 1A15.

(6) Alternately tighten each assembly captive

screw a few turns each until the digital data combiner

(4) Loosen the three cover captive screws

1A12 is firmly seated in the electrical equipment cabinet

securing the hinged front cover and lower cover.

lA15.

(5) Using a card extractor carefully remove

(7) Reconnect cable assemblies lA15W28

plug-in components lA12A1 through lA12A8 from the

and 1A15W29 connectors 1A15P4 and 1A15P5 to

digital combiner : hassis.

digital data combiner jacks J1 and 32 respectively.

(6) Remove four screws on rear : over and

(8) Set the POWER ON/OFF switch on meter

remove cover.

panel assembly 1A15A8 to ON.

(7) Remove four screws on bottom of Digital

data combiner case.

Change 6

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