Teletype 28 Quick Start Manual

TELETYPE CORPORATION
Skooe, Illinois,
u.s.
A.
SECTION 573-127-705TC
Issue 1, May, 1967
28 TRANSMITTER DISTRIBUTOR UNIT (LXD)
DISASSEMBLY AND REASSEMBLY
1.
2.
CONTENTS PAGE
GENERAL................... 1
DISASSEMBLY AND
REASSEMBLY OF UNIT
1
COVERPLATE. . . . . . . . . • . . . . . . 1
TOP PLATE . . . . . . . . . . . . . . . . .
TAPE GUIDEPLATE . . . . . . . . . . . .
OIL RESERVOffi . . . . . . . . . .... .
REAR PLATE ASSEMBLY . . . . . . . .
MAIN SHAFT ASSEMBLY . . . . . . . .
CENTER PLATE ASSEMBLY . . . . . .
3
3
3
3
3
3
1. GENERAL
1. 01 This section provides instructions for
disassembly and reassembly of the 5- and
6-level, single contact, 28 transmitter distri-
butor unit (Figure 1). These instructions out-
line a procedure for removing from the unit
components or subassemblies , ie, tape guide-
plate assembly, rear plate assembly, main
shaft assembly, and center plate assembly.
1. 02
Most maintenance, lubrication, and ad-
justments can be done
by
removing the
transmitter distributor from its base.
If
possi-
ble disassembly should be confined to the com-
ponents or subassemblies which can, in most
cases, be removed without disturbing the ad-
justments. However, when reassembling the
unit, check all associated adjustments, clear-
ances, and spring tensions .
CAUTION: DISCONNECT EXTERNAL AC OR
DC POWER SOURCE BEFORE WORKINGON
TRANSMITTER DISTRIBUTOR UNIT.
1. 03
To facilitate adjustments on earlier
models, a generous length of cable is
prqvided between the unit and its terminal block
to allow rotation or inversion of the unit. The
ac or de potential must be disconnected from its
power source. Later model units plug into posi-
tion on their bases.
1. 04 Exercise care when replacing the unit to
keep the cable free of any moving parts.
For a more detailed illustration of the units,
refer to the appropriate 28 transmitter distri-
butor parts section.
1. 05 Retaining rings are of spring steel and
have a tendency to release suddenly.
The loss can be minimized by holding the ring
with the left hand to prevent it from rotating.
Place the blade of a suitable screwdriver in one
of the slots of the ring. Rotate the screwdriver
in a direction to increase the diameter of the
ring. The retaining rings should come off
easily without flying .
1. 06 If a shim mounted part is removed, note
the number of shims used at each mount-
ing point so that the same shim pile -up can be
replaced when the part is reassembled.
1. 07 Avoid loss of springs in disassembly by
holding one spring loop with the left hand
while gently removing the opposite loop with a
spring hook. Do not stretch or distort springs
while removing them.
1. 08
Remove three screws that secure the
transmitter distributor unit to the base
and lift unit free. On earlier models remove
cable connections from the terminal board and
cable clamps from the base.
2. DISASSEMBLY AND REASSEMBLY OF
UNIT
COVERPLATE
2. 01 To remove the coverplate assembly, lift
the coverplate from its detented posi-
tion.
©
1962 and 1963 by Teletype Corporation
All rights reserved
Printed in U. S. A.
Page 1