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Page Title: Removal and Replacement of 20-Hz Ringing Assembly Module A3
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TM 11-5895-1123-34
metal cable clamps must also be removed from around
module to the rear of the mounting chassis.
the wires in order to separate the individual wires going
i.
Remount the retainer card support
into the connector, and the clamp mounts must be
frame on the front of the generator mounting chassis and
unscrewed from the rear of the connector to obtain
secure it in place with the four screws.
access to the inside of connectors.
j.
If the protective cover on TB 1 was
removed, put it in place and secure it with the two
screws.
4-12. Removal and Replacement of 20-Hz Ringing
Assembly Modules Al or A2
4-13. Removal and Replacement of 20-Hz Ringing
Assembly Module A3
a.
Remove the four screws which hold the
card retainer support frame to the generator mounting
a.
Loosen the two quarter-turn retaining
chassis and remove the retainer support frame.
screws which hold the circuit card retainer in place in
b.
Remove the two mounting screws from
front of the A3 module and remove the circuit card
the front panel of the Al or A2 Ring Generator module
retainer.
which hold the module to the rear of mounting chassis.
b.
Pull forward on the A3 module and
c.
If the A2 module is to be removed,
remove it from the generator mounting chassis.
remove the two screws which hold the plastic protective
c.
Slide the replacement A3 module into
cover on TB 1 and remove the cover.
the generator mounting chassis and push rearward until
d.
Remove the four screws which hold the
it is seated in rear connector.
two retaining clamps on top of the module in place and
d.
Set the circuit card retainer in place and
remove the retaining clamps.
tighten the two quarter-turn retaining screws to secure it
e.
Pull forward on the module and remove
in place.
it from the mounting chassis.
f.
Insert the replacement module and push
4-14. Removal and Replacement of 20-Hz Ringing
it rearward until it is plugged into the rear connector on
the mounting chassis.
Assembly Multipin Connector
g.
Set the two retaining clamps in place
and secure them to the generator mounting chassis with
a.
Perform the removal procedure for
the four screws.
module A2 as outlined in paragraph 4-12 above.
h.
Insert the two mounting screws through
b.
Perform the procedure outlined in
the front of the module and tighten them to secure the
paragraph 3-6b above, except the screws must be
removed from the clamp mounts on the rear of the
connector to obtain access to the inner parts of the
connector.
c.
Perform the replacement procedure for
module A2 as outlined in paragraph 4-12 above.
4-23

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