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
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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