Teletype 33 User manual

TELETYPE CORPORATION
Skokie, Illinois, U.S. A. SECTION 574-100-201TC
Issue 6, June 1974
33 TELETYPEWRITER SET
INSTALLATION
CONTENTS PAGE
1. GENERAL .•.....••.•.......
UNPACKING ........•....•...
PREPARATION FOR
INSTALLATION ...•••.••.•.••.
2. INSTALLATION ...........•.•.
MOUNTING TYPING UNIT
ON STAND ................•.
1
1
2
3
3
CODING ANSWER-BACK DRUM.... 3
ELECTRICAL CONNECTIONS AND
PRE-SERVICE PROCEDURES ..... 8
PLACEMENT . . . . . . . . • . • . . . . . 12
A. Without Stand . . . . • . • • . • . . . 12
B. With stand . . . . . . . . . . . . . . . 12
3. FINAL ASSEMBLY. . . . . . . . . . . . . 12
GENERAL . . . . . . . . . . . . . . . . . . 12
RIBBON INSTALLATION. . . . . . . . . 12
PAPER OR FORM INSTALLATION. . 12
A. Friction Feed . . . . . . . . . . . . . 12
B. Sprocket Feed. . . • . . . . . . . . . 14
4. TAPE READER . . . . . . . . . • . . . . . 15
5. POWER PACK ASSEMBLY. . . . . . . . 15
6. TAPE PUNCH................ 17
7. RESHIPMENT . . . . . . . . . . . . . . . . 18
8. OPTIONAL FEATURES. . . . . . • . • . 20
A. Copyholder . . . . . . • . . . . . • . . 20
B. Busy Circuit. . . • . . . . . . . . . . 20
C. Hand Receiver. . . . . . . . . . . . . 20
1. GENERAL
1.01 This section provides installation in-
structions for the 33 Teletypewriter Set.
It is reissued to consolidate information and make7
some minor changes throughout the section.
Marginal arrows have been used to indicate the I
changes. __i
1. 02 References to left, right, front, or rear,
etc, consider the teletypewriter set to be
viewed from a position where the typing unit
carriage faces up and the typing unit selector
mechanism is located to the viewer's left.
1. 03 Tools and materials used for teletype-
writer set installation are shown in
Section 570-005-800TC.
Note: To avoid injury, take special care
when working with a teletypewriter set con-
nected to its power supply.
1. 04 Leads for the signal line must be fur-
nished by the customer.
UNPACKING
1. 05 The teletypewriter set is packed in one
carton. Observe all caution and instruc-
tion labels on the carton before breaking the
seals.
1. 06 Cut tape at center and end seams. Open
carton and remove the upper filler pads.
Remove typing unit carefully to avoid damaging
the plastic cover. Take out the remaining car-
ton fillers and the stand (if used).
1. 07 The typing unit and subbase are mounted
on a shipping pallet by six screws. Re-
move the six screws, being careful that the typ-
ing unit does not fall off the pallet. Once the
shipping screws are removed, the typing unit
is retained only by the cover.
© 1962, 1963, and 1964 by Teletype Corporation
All rights reserved
Printed in U.S. A. Page 1

SECTION 574-100-201 TC
Note: Retain the forward mounting screw and
associated flat washer. This screw is used to
secure the typing unit when shipped to another
location without its cover fastened in place.
The screw and washer may be stored in the
TP181104 cable clip (included in bag of hard-
ware with pedestal mounted units) to be
mounted on the typing unit frame between the
two dashpot mounting screws (Figure 1).
1. 08 Remove typing unit from the shipping
pallet.
CAUTION: DONOT TILT THE TYPING UNIT
AFTER IT HASBEEN REMOVED FROM THE
PALLET. THE TYPING UNIT FLOATS ON
RUBBER ISOLATORS AND MAY PULL
LOOSE IF IT IS TILTED.
PREPARATION FOR INSTALLATION
1.09 Remove the tape from across the top of
the cover and take out the cables, platen
knob, and paper spindle from the paper recess.
Unwrap the parts.
DASHPOT
MOUNTING SCREWS
(Left Side View)
1.10 Remove the call control bezel, if used,
after removing its two mounting screws.
Remove volume control knob or power switch
rotary knob, if used, by pulling knob forward.
Detach the nameplate (Figure 2) by pulling it
down and out. Remove the four front and three
rear cover mounting screws.
Note: On Automatic Send-Receive (ASR)Sets,
remove the screw from the left rear corner
of the tape reader cover.
Gently lift the cover from the subbase.
1. 11 Remove the twist tie holding the carriage
to the left side frame of the typing unit.
1.12 If a stand is used, remove its two rear
panel mounting screws and take panel off.
Remove the copyholder, if used, from inside the·
stand. Remove the bag tied to the stand and
place its hardware contents on the bench.
TYPING UNIT
HOLD-DOWN
SCREW AND
LOCKWASHER
DASHPOT
Figure 1 - Typing Unit Hold-Down Screw Storage
Page 2

ISS 6, SECTION 574-100-201 TC
MOUNTING
SCREWS (3)
PAPER ROLL
SPINDLE LID AND WINDOW
(Left Front View)
Figure 2 - Cover Mounting
1.13 Use the supplied screws to fasten the data
set, if used, to the relay rack.
1. 14 The teletypewriter set should be thor-
oughly lubricated before placing it into
service and re lubricated after the short period of
service specified in the lubrication sections.-
Thereafter, maintain the regular lubrication in-
tervals as required in the appropriate lubrication
sections.
2. INSTALLATION
MOUNTING TYPING UNIT ON STAND
2.01 If the teletypewriter set is to be bolted
to the floor, remove the front screw in
each leg of the stand (Figure 3).
2. 02 Install the plug button, included in the bag
of hardware, in the forward hole in the
bottom of the subbase.
2. 03 Place the subbase and typing unit on top
of the stand so that its back edges and
sides line up with the back edges and sides of the
stand. Install the two retaining clips, included
in the hardware bag, on the base at the rear (one
each end) and snap them in place on the stand.
Refer to Figure 4.
2. 04 Mount the base to the stand from the bot-
tom with four no.14Z screws and associ-
ated flat washers.
CODING THE ANSWER-BACK DRUM
2. 05 To remove answer-back drum for coding,
press back and down on the tab portion of
the TP180854 brace until it becomes detented in
its open position. Lift feed pawl slightly (do not
overextend its spring) and remove drum.
Page 3

SECTION 574-100-201 TC
Page 4
FRONT
MOUNTING
SCREWS (2)
LEVELING
SCREWS (2)
FOR BOLTED INSTALLATION
INSTALL LAG BOLTS (2)
FROM INSIDE REAR OF STAND
STAND
(Left Front View)
0. 328 INCH DIAMETER
HOLES FOR
-.......~,..._-RUBBER BUMPERS
Figure 3 - Stand Leveling and Anchoring and Assembly of Subbase
with Typing Unit to Stand

ISS 6, SECTION 574-100-2011'C
TP186593 RETAINING CLIP TP186592 RETAINING CLIP
SUBBASE
STAND
(Rear View)
Figure 4 - Installation of Retaining Clips to Subbase and Stand
2. 06 Code the answer-back drum in a counter-
clockwise direction (Figures 5 and 6),
starting with row no. 1.
Note: The ST row is the first row sensed at
the beginning of an answer-back cycle. It is
coded at the factory for character suppression
and must not be recoded.
2. 07 A particular character is coded by either
retainingor removing tines withina row,
as illustrated in Figure 5. A tine may be re-
moved by either of the two following methods:
(a) Method 1: Place the end of a screw-
driver blade at the base of a tine in the
row previously coded. Press the· side of the
blade against the top of the unwanted tine un-
til the tine breaks off. Figure 5 illustrates
this method - pressure applied to base of
row no. 18 and against top of adjacent tine
being removed from row no. 19.
(b} Method 2: Place the unwanted tine in the
slot of a TP 161686 tine tool, or grasp the
tine firmly with long-nose pliers. With the
tool or pliers held stationary, rotate the
answer-back drum back and forth until the
unwanted tine breaks off near its base. Do
not damage adjacent tines.
Note: If a coding error is made, or for
some other reason it is necessary to sup-
press (erase) characters from the answer-
back drum, remove the character sup-
pression tine from the row(s) affected.
Page 5·

SECTION 574-100-201 TC
Page 6
10
11
12
DRUM
CHARACTER
SUPPRESSION
ROWS
7 6 5
(Left Side View)
SCREWDRIVER BLS
LEVELS
STOP
CAM
FEED
RATCHET
(Rear View)
Figure 5 - Answer-Back Drum

ISS 6, SECTION 574-100-201TC
ASCII CODE ASCII CODE
CODE LEVELS 1967 1965 1963 CODE LEVELS 1967 1965 1963
8 7 6 5 4 3 2 I Edition Edition Edition 8 7 6 5 4 3 2 I Edition Edition Edition
•
••
••••
•
•
•• NUL NULL D •
D••
■
D
■
•
D• 2
Q.•
••••
••
•• SOH SOM •
•
D •
•
•
D •• D D 3
D
■ ■ ■ ■
•
■
•
■
□■
STX EOA D
■
D
■
•
■
D • D •• 4
•
•••
•
•
■■
•
DD ETX EOM •
■
D•
•
•
D • D • D 5
D ••
•
•
•
••
D ■
• EOT
■ ■
D•
■
•
D •DD • 6
•
•••••
••
D ■
D ENO WRU D
■
□■
••
D • D D D 7
••
••••
I ■
•
DD • ACK RU
□■ □■
•
■
D
□■
•• 8
□■
■■ ■■ ■■
D DD BEL BELL
■
•
D •
•
■
D
D ■
•
D 9
□■
•
•••
■□
••
• BS FEo ••
D ■
•
•
D
□■
D• :
••
••
•
•
■□
••
D HT HT/SK
□■
□■
••
D
□■
D D ;
••
•
••
•
■□
•
D • LF ••
□■
••
D DD •
• <
□■
••
••
■□ ■□
D VT VTAB
□■ □■
••
D DO
■□
=
••••
••
■□
□■
• FF
□■ □■
••
D OD D• >
D ■
••••
■□ □■
D CR ••
D ■
••
D OD DD ?
□■
••
••
■□
DD • so OD ••
••••••• (Q) \ @
••••
••
■ o
OD D SI
■ D
•••••••
■□
A
□■
••••
□■
••• DLE DCo
■□
••
•••••
□■
B
••••••
□■ ■■
D DCl '. .;- • i DO ••
•••
■■
DD C
i
••
••
••
□■
■ D
• Dr-2
■□
••
••••
□■
• D
□■
••••
□■ ■□
D DC3 \'·- /'·,•.
~
OD ••••••
□■
D F
••
••
••
□■
□■
• DC4 DC4 /STOP) OD ••••
••DO • F
□■
••••
□■
D ■
D NAK ERR
■□
••••
••DO 0 G
□■
••••
D ■
OD • SYN SYNC
■ D
••
••
■□
••
• H
••
••••
D ■
DD D ETB LEM DD ••••
■□
••
0 I
••
••••DD ••• CAN So DD ••••
■□ ■□
• J
□■
••••DD ••D EM S,
■ D
••
••
■□
■ D
0 K
0 ■
••••DD
■ D
• SUB ss S, DD ••
••
■ ID D ■
• L
••
••
••
DD
■ D
D ESC S,
■□
••
••
■□
□■
D M
□■
••••DD
□■
• FS s.
■□
••••
■□
DD • N
••
••••
DD
□■
D GS s. DO ••••
■□
DD D 0
••
••
••
DD DD • RS S,
■□
••
••
□■
••
• p
□■
••••DD DD D us S, OD ••••
□■
■■
0 Q
□■ □■
••••••• SP .b DD ••
••
01 ■
r ■
D ■
R
••
□■
••
••
••D I
■□
••••
□■
■□
D s
••
□■
••••
■□
• II DD ••
••
D ■
D ■
• T
□■
D ■
••
••
■ D
D #
■□
••
••
□■ □■
D u
••
□■
••••
□■
• s
■□
••
••
□■
DO • V
□■
D ■
••
••
□■
D % DO ••
••
□■
DO D w
D ■
□■
••
••
DD • & DD ••
••
DO ••
• X
••
D ■
••••DO D ' ,
■ o
••••OD ••D y
••
□■
••
■□
••• l
■□
••••
DD
■ D
• z
□■
D ■
••
■□
••D I DD ••••
DD
■ D
D [
□■
o ■
••
■□ ■□
• *
■□
••
••
DO 011 • \ ,,.._,, '
••
o ■
••
■ o ■ o
□
+ DD ••••DO
0 ■
D 1
D ■
□■
••
■□
D ■
• , DD ••••
OD DD • I\
♦
••
o ■
••
■ o
□■
D -
■□
••
••
DD DO D --
••
□■
••
■□
DO • . DO
□■
••DO
o ■
• I --, ACK
□■ □■
••
■□
OD D I
■ o o ■
••
DO
o ■
D } AIJ MODE
••
□■
••
□■
••• 0
■□ □■
••
DD DD •
~
I ESC
D ■
D ■
••
□■
••D I DO
□■
••DD
□□
□
DEL
■ a
□■
••
ca
■ a
a {
I CYCLE OPER. ROW6 ••
••
□■
••
••
•
I CYCLE OPER, ROW ST ••
■□
••
•••••
■
LEAVE TINE
2 CYCLE OPER, ROWS6 Sl7 ••
••
□■
••••
•
2 CYCLE OPER. ROWSST SIi ••
■ o
••••••
■
3 CYCLE OPER ROWS 6.13 20 ••••
o ■
•••••
□
REMOVE TIN E
3 CYCLE OPER. ROWSST 7 14 ••
■□
••
••••
•
CHARACTER SUPPRESSION I '
sroP CAM
EE
F D RATCHET
Nate 1: Blank space indicates no change from latest editon.
Nate 2: Codes shown are for even parity operation - for non parity, remove eighth level tine.
Figure 6 -Answer-Back Drum Coding Page7

SECTION 574-100-201 TC
2. 08 The length of an answer-back sequence
can be varied either by removing the stop
cam tine(s) and/or the character suppression
tine(s).
(a) For short sequences, code the drum for
either 2- or 3-cycleoperationby remov-
ing the appropriate tine(s) as indicated in
Figure 6.
(b) Removal of the character suppression
tine from any row prevents transmission
from the answer-back mechanism. To shorten
the answer-back sequence, remove the sup-
pression tine from any unused row(s) after
the end of a message.
Note: Do not remove the character sup-
pression tine from the last row of each
segment of the answer-back drum - row
no. 20 for answer-back drums coded for
1-cycle operation - on sets used in sys-
tems where a response to each answer-
back activation signal must be obtained.
The last row can be coded with any other
character that is compatible with the par-
ticular system.
2. 09 The number of rows available for mes-
sage coding is shown below for 1-, 2-,
or 3-cycle operation.
CYCLE
OPERATION
1
2
3
TOTAL
ROWS
21
10 (11)*
7
*Alternately one, then the other.
AVAILABLE
ROWS
20
9 (10)*
6
2.10 The number of rows available for actual
station identification is less than shown
above, because each coded message should begin
and end with CARRIAGE RETURN and LINE
FEED (this may be altered in specific applica-
tions). This assures that the transmitted mes-
sage will appear at the beginning of a line of the
receiving teletypewriter set and eliminates
overprinting.
2.11 In switched network service, the station
identification for 1-cycle operation may
not exceed 14 characters, including spaces.
The answer-back drum should be coded as
follows.
Page 8
ABBREVIATION KEY TO ABBREVIATION
ACK
CR
LF
RO
SP
SUP
(a) Example 1:
SUP CR LF RO
Acknowledge
Carriage Return
Line Feed
Rub Out
Space
Character Suppression
TELETYPE SP NILES CR LF. ACK
Company City
station Identification
(Maximum-14 characters)
Note: In this system, the ACK character
code combination must be the final signi-
ficant character code combination in the
coded answer-back message.
(b) Example 2:
SUP CR LF RO
ERIE SP BOST CR LF ACK SUP
SUP SUP SUP SUP
Company City
Station Identification
(Less than maximum
number of characters)
Note: If the station identification is less
than the maximum of 14 characters in
length, then the remaining rows on the
answer-back drum must be coded with the
character suppression code according to
Example 2 above.
2.12 To replace the answer-back drum, place
the TP180854 brace in its detented open
position, and lift feed pawl (do not overextend
its spring). Replace drum with its shaft firmly
seated in the contact block slots. Release feed
pawl and TP180854 brace. Rotate answer-back
drum to assure proper seating of its associated
parts. Check that the contact wires are located
in their proper slots.
ELECTRICAL CONNECTIONS AND PRE-
SERVICE PROCEDURES
CAUTION: MAKE SURE POWER CORD IS
NOT CONNECTED.

2. 13 Refer to the appropriate wiring diagrams
packed with the teletypewriter set.
2. 14 Connect the signal line leads (supplied
by customer) to the terminals on the
terminal board at the rear of the call control
unit as indicated in the wiring diagram.
2. 15 Connect power cord to an ac source, 115
volt 60 Hz.
2.16 CheckDASHPOT ORIFICE(Spacing Area)
adjustment, since altitude may have
some effect on dashpot operation. See Section
57
4-122-700TC.
2.17 Sets equipped with an answer-back mech-
anism must be tested for proper response
to a predetermined call character suchas WRU.
The following procedure is recommended for
performing this test.
(a) Use a predetermined call character such
as WRU, to call in the newly installed set.
(b) The set should establish the connection
and automatically transmit the answer-
back message.
Note: Set will not respond if the suppres-
sion tine has been removed from the last
row. See 2. 07 (b).
(c) If proper response is not obtained, check
and correct the answer-back area adjust-
ments (Section 574-122-700TC), beginning
with those of the following list.
DRUM POSITION
TRIP LEVER CLEARANCE
FEED PAWL POSITION
FEED LEVER POSITION
"HERE-IS" BELLCRANK POSITIONING
TRIP BAIL POSITIONING
CHARACTER SUPPRESSION CONTACT
WIRE GAP
2. 18 The 33 Teletypewriter Sets are shipped
from the factory with the automatic car-
riage return-line feed feature in the typing unit
ISS 6, SEC'l'ION 574-100-201 TC
disabled by means of clips. The clips mount
over slots in the TP180950 front tie bar. To
enable this feature on friction feed sets remove
the clip over slot A. To enable this feature on
sprocket feed sets remove the two clips, in slot
A and slot L.
Note: Slot A is not stamped on the function
casting. Refer to 574-122-700TC for orien-
tation.
2. 19 Connect the signal line leads (supplied
by customer) to the terminals on the
terminal board at the rear of the call control
unit as indicated in the wiring diagram.
2. 20 The 33 Teletypewriter Sets are shipped
from the factory with the even parity
option installed in the keyboard. The customer
may:
(a) Retain even parity, or
(b) Wire the keyboard for the 8th bit always
marking, or
(c) Wire the keyboard for the 8th bit always
spacing.
The wiring options are installed by connecting
wires to terminals at the right front of the key-
board and at the left contact block (see Figure 7).
The options are shown in the Keyboard Wiring
Options Table.
2. 21 Low Tape Contact Adjustments (for units-
so equipped): -
(a) Operating Arm Adjustment (Figure 8):
Replace cover. With tape spindle in
place, there should be 5/16 inch to 7/16 inch
clearance between operating arm and tape
spindle. To adjust, bend operating arm.
(b) Operating Arm Clearance (Figure 9):
Remove cover. The operating arm
should have a minimum of 1/8 inch clearance
Page 9

SECTION 574-100-201 TC
TERMINALS
(Right Contact Block)
TERMINALS
(Left Contact Block)
Note: Push the terminals on the contacts with long-nose
pliers. It should be possible to install the parity options
without removing the keyboard.
Figure 7 - Location of Terminals on Keyboard
for Parity ~ptions
KEYBOARD WIRING OPTIONS TABLE
LEAD 1 LEAD 2
Left Contact Block Left Contact Block
OPTION Color: Red-Green Color: Green
Even parity ON OFF
8th.bit
Always mark OF.t<, ON
8th bit Either Lead 1 or.
Always space Lead 2 ON or both OFF
Note 1: Tape and store unused leads.
Note 2: Reference: 9334WD
Page 10
LEAD 3
Right Contact Block
Color: Green
OFF
ON
ON or
OFF
(Left Front View)
LEAD 4
Right Contact Block
Color: White-Slate
ON
ON
OFF

TAPE SPINDLE
(Left Rear View)
Figure 8 - Operating Arm Adjustment
CABLE
RESTRAINER
SUBBASE
(Top View)
0
OPERATING
ARM
Figure 9 - Operating Arm Clearance
ISS 6, SECTION 574-100-201TC
between the left edge of the operating arm at
the closest point and the cables and cable
restrainer at the left rear corner of the set.
Gauge by eye. To adjust, bend switch bracket
and/or reposition cables and reform cable
restrainer.
(c) Operating Arm Clearance (Figure 10):
Install cover. The tape roll should not
touch the operating arm at any point other
than the activating portion of the arm. To
adjust, bend switch bracket and/or reposition
cables and reform cable restrainer.
OPERATING
ARM TAPE ROLL
--,....i.-----+-----SOME
CLEARANCE
(Top View)
Figure 10 - Operating Arm Clearance
2,22 Air Deflector (Motor Area) Adjustment:·
Note: This adjustment applies to 50 Hz sets
only (so equipped). -
(a) There should be at least 1/8 inch
clearance at closest point between air
deflector and motor fan. To adjust, posi-
tion and/or bend air deflector.
(b} There should be some clearance
between air deflector and the lowpaper
alarm sensing rod so that the air deflector
does not interfere or restrict the total
travel of the sensing rod. To adjust, posi-
tion and/or bend air deflector.
Page 11

SECTION 574-100-201 TC
2.23 Connect power cord to ac source, 115
volt, 60 Hz or 50 Hz.
PLACEMENT
A. Without Stand
2. 24 If a stand is not included, place the tele-
typewriter set on the surface where it is
to be used.
B. With Stand
2. 25 Figure 3 illustrates the facilities for
leveling and anchoring the stand.
2. 26 Place the partially assembled set where
it is to be used. If the set rocks to one
side or another, tip it slightly and reposition the
leveling screws.
Note: Reaction to the carriage returning to
its left position may cause early design tele-
typewriter sets to move across the floor to-
ward the left. To correct this, either add
weight to the stand, arrange to have it bolted
to the floor, or drill one 0. 328 inch diameter
hole into each leg and install TP182285 rub-
ber bumper in each leg.
2.27 If the teletypewriter set is to be bolted
to the floor, place stand at the desired
location and drive lag bolts into the floor through
the front holes in the legs.
2. 28 Place the relay rack inside the stand.
3. FINAL ASSEMBLY
GENERAL
3. 01 Replace the back panel onto the stand, if
used, using the removed screws.
Note: Before replacing an ASRcover, remove
the retaining clip (early design units only)
from the tape reader upstop screw (Figure 15).
Also, prepare the punch for manual or auto-
matic operation as described in 6. 01.
3. 02 Replace the cover over the typing unit and
onto the subbase (Figure 2). Take care
that all seams are tight and that keyboard push-
buttons, dial, etc, are properly aligned. Insert
and tighten the cover mounting screws removed
during PREPARATION FOR INSTALLATION.
Note: On an ASRSet, insert and tighten screw
at left rear corner of tape reader cover.
Page 12
3. 03 Replace the nameplate making sure that
the formed lip fits around the bottom of
the flange on the cover, that the top edge is be-
hind the small lip on the cover, and that the bot-
tom of the nameplate rests ontop of the two small
projections on the subbase.
3. 04 Replace the volume control knob or the
power switch rotary knob, if either is
used, by positioning and pushing it rearward.
3. 05 Position the bezel, if used, on the cover
over the call control unit. Insert and
tighten its two mounting screws.
3. 06 On friction feed typing units, align the
platen knob with the flat on the left side
of the platen. Push knob in place. On sprocket
feed typing units, install platen knob onleft side
of platen. Fully seat knob to the right and se-
cure it with the screw provided.
RIBBON INSTALLATION
3. 07 Figure 11 illustrates ribbon threading.
3. 08 Raise the cover lid. Pull both spools off
the friction spindles.
3.09 Engage the hook at the end of the ribbon
in the hub of the empty spool; if there is
no hook, pierce the end of the ribbon over the
point of the arrow in the hub of the empty spool.
Wind a few turns of ribbon onto the empty spool
in the direction indicated by the arrow, and make
sure that the reversing eyelet has been wound
upon the spool.
3.10 Place the spools on the shafts in such a
manner that the ribbon feeds to the rear
from the right side of the right spool and from the
left side of the left spool. Turn each spool slight-
ly until the spool driving pin engages the hole in
the spool. Guide the ribbon around the right ver -
tical post and through the slot in the reverse
arm. Place the ribbon in the ribbon guide behind
the typewheel. Guide the ribbon through the left
side of the reverse arm and around the vertical
post. Rotate the spool to take up any slack.
PAPER OR FORM INSTALLATION
A. Friction Feed
3.11 A friction feed teletypewriter set accom-
modates a standard roll of paper 8-1/2
inches wide and 5 inches in diameter. Figure 12
illustrates paper threading for a friction feed
typing unit.

TYPEWHEEL
SPOOL
DRIVING
PIN
MlI
Figure 11 - Ribbon Threading
PRESSURE PAPER DEFLECTOR
LEVER PAPER GUIDE
COVER GUIDE
LID
\ -
/
{
I
I,..
~
I
v
PAPER STRAIGHTENER
ISS 6, SECTION 574-100-201TC
REVERSING
EYELET
HOOK
ON END
OF RIBBON
COVER
-✓
"
\ \
SLOTS \
PAPER ROLL
SPINDLE
Figure 12 - Paper Threading - Friction Feed
Page 13

SECTION 574-100-201 TC
3.12 Insert the paper roll spindle into the roll
of paper so that an equal length of spindle
is exposed at either end of the roll. Place roll
into the cover recess with the· ends of the spindle
resting in the slots so that the paper will unroll
from the bottom.
3.13 Raise the cover lid. Release pressure
roller tension by moving the pressure
lever forward. Prepare a smooth leading edge
of paper. Pass paper over paper straightener,
under platen, and under paper guide. Straighten
paper and reapply the pressure roller tension.
Close the cover lid.
Note: When typing units are stored or out of
service for an extended period of time, re-
lease the pressure roller tension.
B. Sprocket Feed
3.14 A sprocket feed teletypewriter set ac-
commodates forms 8-1/2 inches wide
and of various lengths. The forms are normally
passed to the typing unit from a conveniently
located supply at the rear of the set.
3.15 Place the paper roll spindle into the paper
recess of the cover so that it rests in the
slots provided.
SPROCKET
PIN
3. 16 Figure 13illustrates form threading for a
sprocket feed typing unit. ·
3.17 Form Threading: Raise the cover lid.
Pass the leading edge of the first form
under the paper roll spindle. Thread the form
under the low-paper andpaper-out arms, if used,
and between the platen and paper guideplate.
Guide the form squarely into the platen and ro-
tate the platen until the form is advanced by the
sprocket pins. Lift up the wire guide and con-
tinue to _rotate the platen until the form is under
the wire guide and positioned for the first typing
line. Lower wire guide and cover lid. After the
first form is fed out, lift the form over the paper
roll spindle to separate the incoming forms from
the outgoing forms.
3.18 Figure 14 illustrates the zeroizingposi-
tion of the platen drive mechanism for
one cam lobe operation. For platen drive
mechanisms using more than one cam lobe, see
the CAM ZERO POSITION (Platen Drive Area,
Sprocket Feed Mechanism) adjustment in Section
574-122-700TC.
3.19 Zeroized Position: Position a form at
its first printing line in the typing unit.
Depress the zeroizing button and rotate the
pulley until the index plate is lined up with the
pointer. Release the zeroizing button.
FORM
(OVT)
PLATEN
(Right Side View)
Figure 13 - Form Threading - Sprocket Feed
Page 14

ZEROIZING
BUTTON
PULLEY
BELT
ISS 6, SECTION 574-100-201TC
(Right Side View)
Figure 14 - Zeroizing Position of Platen Drive
Mechanism - One Cam Lobe Operation
Note 1: To initiate the action to feed out a
form, depress the CTRL and FORM keytops.
The form-out mechanism will not respond to
successive commands to feed out a form. At
the end of a form feed-out, advance the form
at least one line before issuing a second
form-out command.
Note 2: The typing unit, in anASR Set, oper-
ates one cycle behind the tape reader. Thus,
a nonprint fill in code selection is required
immediately after each form-out selection
for proper set operation.
4. TAPE READER
4. 01 A retaining ring or clip (Figure 15) is
assembled (on early design units) to the
upstop screw to prevent the sensing pins from
being dislodged during shipment. This retaining
clip must be removed before placing the tape
reader in operation.
4. 02 When inserting tape into the tape reader
prior to operation, allow enough sl~ck in
the tape between the tape punch and the reader
so that the reader lid can be easily closed.
CAUTION: THE TAPE READER OPERATES
UNDER HIGH VOLTAGE. PRECAUTIONARY
MEASURES SHOULD BE TAKEN WHENEVER
POWERTO THE TAPE READERIS TURNED
ON. HIGH VOLTAGE FROM THE POWER
PACK WILL CONTINUE UNTIL APPROXI-
MATELY 10 SECONDS AFTER THE TAPE
READER HAS BEEN DISCONNECTED.
4. 03 Do not place the control lever beyond the
STOP position while the tape reader is
operating under power. The reader must come
to a complete stop before placing the control
lever in the FREE position.
5. POWER PACK ASSEMBLY
5.01 The sets have the power pack for the tape7
reader mounted in the call control unit;
therefore, no installation is required. Should it
be desirable to place other equipment in the call
control unit, the reader power pack may be
mounted inside the stand, underneath the base.
Two clips attach the power pack to the stand at
the left front corner when the set is viewed from I
the rear. See Figure 16. ....J
5. 02 The auxiliary ASR power supply is
mounted in the enclosure of the stand. It
is used in the off-line mode to provide 115 volts
Page 15

r
L
SECTION 574-100-201TC
UPSTOP
BRACKET
~ UPSTOP
REMOVE SHOULDER
RETAINING CLIP (TP184005) SCREW
BEFORE OPERATING
TAPE READER
Figure 15 - Tape Reader Upstop Bracket Retaining Clip
CONNECTOR
-- l/2INCH CLIPS
- - - ------ t--~---,---t....""""'.....r---------t... .....
.....r--;::--;;----,----.-
GREEN GROUND STRAP
POWERPACK
PEDESTAL GROUND TERMINAL
(Top View as Viewed From Rear)
RIGHT PANEL
Figure 16 -Power Pack Assembly
Page 16
FRONT
PANEL
\

on the tape reader, answer- back, and distributor
contacts when a tape reader is used. When the
tape reader is not used, a plug with a jumper
wire is inserted in position R2 at the rear of
the call control unit.
6. TAPE PUNCH
6. 01 The 33 l'eletypewriter Sets are shipped
with the tape punch having two disabling
clips installed in slots A-O and A-8. If manual
operation of the tape punch is desired, retain
the two clips; if automatic operation is desired,
remove the two clips. See Figure 17.
ISS 6, SECTION 574-100-201l'C
6. 02 Figure 18 illustrates the installation of
a tape spool in a tape roll.
(a) For 2-inch inside diameter tape rolls,
use the tube-type spool.
(b) For 1-inch inside diameter tape rolls,
use the 2-piece spool.
(c) Place the tape and spool into the tape
punch cover so that the leading edge of
the tape is at the top of the roll.
CODEBAR
EXTENSIONS
DISABLING CLIP
SLOT A-8 -=t:vv
~~~~~~~~✓
DISABLING CLIP
SLOT A-O ""'or-P (Top View)
SENSING
LEVERS
PUNCH
BLOCK
__/CLTP
r--/Jt+-.J / SENSING
L C---.~r,
---, , , L__ -, LEVER
LJI L ____ J
(Side View)
Figure 17 - Tape Punch Disabling Clips
];>age17

SECTION 574-100-201TC
2-PIECE SPOOL
FOR 1-INCH INSIDE
DIAMETER TAPE ROLLS
TUBE-TYPE SPOOL
FOR 2-INCHINSIDE
DIAMETER TAPE ROLLS
TUBE SPOOL
(Front View)
TAPE ROLL
(Front View)
Figure 18 - Tape Roll and Tape Spool Assembly
6. 03 Figure 19 illustrates the chad box in-
stallation.
(a) Assemble the chad box under the tape
punch pan by inserting the back of the
flanged surface between the stand and the
typing unit subbase.
(b) Push the chad box toward the rear
until the bent surface located at the front
of the· chad box engages the stand. .A,n
embossing located on the front bottom
surface of the flanged surface engages an
oblong hole in the stand and holds the chad
box in place.
(c) To empty the chad box, lift the front
slightly and pull the chad box toward the
front until it becomes disengaged.
Page 18
•
7. RESHIPMENT
7. 01 If the teletypewriter set is to be shipped
to another location without its cover, the
following must be done to avoid damage to the
typing unit.
(a) Remove subbase and typing unit from the
stand.
(b) Remove the plug button from the forward
mounting hole in thP bottom of the sub-
base.
(c) Secure typing unit to the base by insert-
ing and tightening the screw and washer
previously stored in the TP181104 cable clip
(l. 09). Do -not damage the typing unit by
overtightening the screw.
(d) Store the removed plug button in the
TP181104 cable clip.

ISS 6, SECTION 574-100-201TC
TAPE PUNCH COVER
TYPING UNIT COVER
TYPING UNIT SUBBASE
TAPE PUNCH PAN
._ __ CHAD BOX __ _.
(Left Side View) (Front View)
(Left Side View)
STAND
Figure 19 - Tape Punch Chad Chute Assembly
Page 19

SECTION 574-100-201 TC
8. OPTIONAL FEATURES
A. Copyholder
8. 01 With the line guide facing forward (Fig-
ure 20), insert _therear mounting tabs in
the lower mounting slots. Pivot the copyholder
to align the front mounting tabs above their
mounting slots. Push copyholder downward until
the tabs are fully seated.
B. Busy Circuit
8. 02 The teletypewriter set is normally wired
in a "don't answer" mode of operation for
low-paper alarms and out-of-service. In this
mode, the set will not answer an incoming call.
To wire the teletypewriter set to indicate "busy"
instead of not answering, move the black-slate
wire from terminal no. 2 to terminal no. 4 on
the ringer terminal strip.
C. Hand Receiver
8. 03 To install the hand receiver, connect the
two white wires to terminals no. 5 and
no. 6 on the 9-point terminal board.
FRONT MOUNTING
TABS (2)
1 REAR MOUNTING
Page 20
20 Pages
(Left Front View)
I · TABS (2)
: MOUNTING
1 : SLOTS (4)
I
I
Figure 20 - Copyholder