Bell System Practices 43 Disassembly/Reassembly

BELL SYSTEM PRACTICES
AT&TCo Standard
CONTENTS
1. GENERAL .....................
TOOLS REQUIRED ..............
2.
3. DISASSEMBLY/REASSEMBLY .....
Replace of Fuses and Access
to Variable Feature Switches ........
Punch and Reader Assembly
with Motor .....................
41 071 1 Logic Card ...............
Power Supply and Rear
Frame Assembly .................
Transport Assemblies .............
Punch Assembly .................
Reader Assembly .................
1. GENERAL
1.01 The procedures provided in this section
break the PTU down into subcomponents.
The appropriate parts
arrangement of subcomponents and parts.
Caution: Remove all
before performing any component replacement.
1.02 Whenever this
reason for reissue will be listed in this
paragraph.
-1.- 0 3
Wlien remoVing a major component
part from the PTU, do not pry or force
parts to provide the necessary clearance for
removal. Follow the removal procedure and note
how each part is removed and the sequence of its
removal so that proper reassembly can be accom -
Prepared for American Telephone and Telegraph Company by Teletype Corporation
43 5- L EVEL PAPER TAPE UNIT
DISASSEMBLY/REASSEMBLY
PAGE
sections illustrate the
power from the PTU
section is reissued, the
© 1981 by Teletype Corporation -
All rights reserved
Printed in U. S. A.
plished. For
procedure except where different instructions
1
are given.
2 Reference in the procedures to left and
1.04
right and up or down and top or bottom,
2
etc, refer to the paper tape unit in its normal
operating position.
2 1.05 Refer
570-005-800 for a complete listing of
3
the various types of hand tools available for main­
5
tenance of Teletype Corporation equipment. For
a listing of the tools required to perform the
·
5
disassembly /reassembly
6
2. TOOLS REQUIRED.
8
9 All ordering numbers shown in this manual
1.06
are Teletype Corporation part numbers.
Some parts that are not listed in the parts
1.07
index are shown as necessary to the dis­
assembly procedures such as screws, ring retain­
ers, etc. Most of these parts are common to other
Teletype Corporation
needed, may already be available in field repair
kits or can be ordered.
Containers and packing materials retained
1.08
from maintenance spares should be saved
and reused when returning defective components
foi repair.
1.0 9 Adjustment information
Punch Unit adjustments and Spring Ten­
sions, Section
or
574-506-700 .
When ordering replaceable components,
Note:
unless otherwise
number with the letters "TP" (ie, TP 41 02 05).
SECTION 574-504- 72 0
Issue 1, July 1981
reassembly, reverse the removal
to Maintenance Tools,
procedures,
product lines
is provided in
57 4-505-700 , and Reader Unit
-and- Spring_ Tensions, �ction
specified, prefix
Section
refer to
and, if
each part
Pagel