Bell System Practices Plant Series Disassembly And Reassembly

BELL SYSTEM PRACTICES
Plant Series
1.

GENERAL

1. 01 The disassembly procedures presented in
this section, together with those given in
the section on general requirements for disas­
sembly of teletypewriter apparatus, will sepa­
rate the single-contact and the multicontact mul­
tiple-mounted transmitter-distributor sets into
their major subassemblies.
This section is reissued to add disassem-
1. 02
bly procedures for the single-contact mul­
tiple-mounted transmitter-distributor set and
to change the title accordingly.
'•.
1. 03 For disassembly routines for the trans-
mitter-distributor units, refer to the sec­
tions on disassembly of the
contact) and 28G
distributor units.
1. 04 To reassemble, reverse the disassembly
procedures.
tion is required,
.
2.

DISASSEMBLY

A. Single-contact Multiple-mounted Transmit­
ter-Distributor Set
2. 01 Transmitter-Distributor Unit: To remove
the units from the base, remove the cover­
plate. Open the hinged panel on the front of the
dust cover. Loosen the two screws on the lock­
ing device at the right rear corner of the trans­
mitter-distributor unit and slide the locking de­
vice to the left.
the front of the unit which secures the unit to the

base.

Lift the unit out of the cover.
on the base, reverse the disassembly pro­
cedure.
right so that there is barely perceptible
gear play.
screws.
2. 02

Dust Cover:

from the base, lift up.
B. Multicontact Multiple-mounted Transmit­
ter-Distributor Set
2. 03 Cover: To remove the transmitter-distri­
butor unit from the multiple base, first
remove the cover, as follows:
MULTIPLE-MOUNTED TRANSMITTER-DISTRIBUTOR SETS
28
(SINGLE-CONTACT AND MULTICONTACT}
DISASSEMBLY AND REASSEMBLY
28H (for single­
(for multicontact) transmitter­
Where additional informa­
a Reassembly Note is added .
Remove the mounting screw at
To reassemble the unit
Position each unit from left to
Tighten the three mounting
To remove the dust cover
© American Telephone and Telegraph Company,
Open the hinged front portion of the cover
(1)
to provide access to each transmitter­
distributor and its attached cradle.
the coverplate.
anchors the cradle in its slide,
ward and pull-forward to disengage the unit.
Lift the cover upward and move toward the
(2)
front.
2. 04 Transmitter-Distributor Unit: To remove
the transmitter-distributor unit from the
cradle, proceed as follows:
(1} Remove the two screws and lockwashers
which secure the plug connector to the cra­
dle.
Reassembly Note: When the screws are re­
screw is on the outside of the cradle.
(2} Remove the two screws and lockwashers
that secure the casting to the rear projec­
tion of the cradle.
washer, and nut that secure the casting to the
front projection of the cradle.
bushing is mounted with its hex head on the top
side of the casting.
(3) Remove the screw,
washer that secure the tape deflector to the
top plate and the screw, lockwasher, and flat
washer that secure the right end of the tape
deflector assembly.
Remove the filler-plate mounting screws.
(4)
Reassembly Note:
verse order, taking care not to damage the
cable, cable connector, or switches.
2. 05 Base:
distributor base, proceed as follows:
(1) Remove the motor mounting screws with­
out disturbing the shaft height unnecessar ­
ily.
( 2) Disassemble the left end of the counter shaft
assembly by removing the screw, together
with its lockwasher and flat washer,
threads through the hub collar into the side of
the shaft.
with its associated lockwasher and flat wash­
ers, which threads through the hub into the end
Printed in U.S. A.
SECTION 573-106-702
Issue 3,
AT&TCo Standard
Remove the clamp screw that
then lift up­
Remove the screw, lock­
Note that the
f
lockwasher,
Reassemble in the re­
To disassemble the transmitter­
Then remove the screw,
1964
April, 1964
Lift off
and flat
which
together
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