IBM Selectric User manual

Selectric I/O
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KeyboBrdless Printer
Field Engineering
Maintenance Manual
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Selectric® Vo
Keyboardless Printer
Field Engineering
Maintenance Manual

Major Revision (February 1966)
This edition, 225-3207-2, is a reprint of 225-3207-1
with the following supplements inserted:
529-4502-0
529-4505-0
529-4509-0
529-4517-0
'529-4512-0
Copies of this and other IBM publ ications can be obtained through IBM Branch Offices.
A form has been provided at the back of this pubI ication for readers' comments. If the
form has been detached, comments may be directed to:
IBM Product Publ ications, P. O. Box 9592, Raleigh, North Carolina 27603

FE Supplement Console Printing Unit
System Unit ____________ -=-_-:-
Re: Form No. ________ --'2=2:..:5_-~32-0.;...7--...,2
This Supplement No. ______ --'S.,.::.2.;...6_-3_0:.,:0-:1...,.--':-0
Date: ____________ M_a_rc_h_1_5.:...., ...,.1_9_6_6
Previous Supplement Nos. ________ .:....N..:..;o:;.:.n=e
This supplement, Form 526-3001-0, presents the additional reference data and procedures
needed for the modified "5electri c" I/O Keyboordless Printing Unit that serves as a con-
sole printer for System/360.
Replace the present contents sheet with the new contents sheet, and insert the text pages
between page 4-36 and the index.
IBM Corp., Product Publications Dept., P. O. Box 9592, Raleigh, N. C. 27603
PRINTED IN U.S.A.

Section 1
Lubrication
General Procedure
Lubrication Procedure
Improved Lubrication
Printer Contact Locations
I nspection Procedure
First Inspection Period.
Second I nspection Period
Third Inspection Period.
Fourth Inspection Period
Motor and Drive
Section 2
Adjustments
Selection Mechanism
Latch Pusher Assembly
Printer Selection Magnets.
Cycle Clutch Trip Mechanism.
Cycle Clutch Latch Inhibitor.
Print Feedback Contect Assembly, C2
Shift Mechanism. •
Shift Magnet AssembJy •
Cycle Clutch Mechanism
Shift Contact Assembly.
Carrier and Rocker Mechanism
Alignment.
Print Mechanism.
Print Mechanism (Stick Shift) .
Escapement Mechanism.
Mainspring and Cords
Operational Control Mechanism.
Operational Magnet Assembly.
Operational Contact and Latch Assembly
Operational Feedback Contacts
Backspace Mechanism
Spacebar Mechanism
Carrier Return Mechanism.
Indexing Mechanism
, Tabulator Set and Clear Mechanism
Tabulator Mechanism (Late)
Tabulation Mechanism .
Margin Control Mechanism
Paper Feed Mechanism.
Ribbon Med:-ani~m
Ribbon Shift Mechanism
Index Selection Solenoids.
Vertical Forms Control
End of Form
Contact.
Cover Adjustment
TABLE OF CONTENTS
1
1
6-1
8
10
10
10
1-11
1-12
2-1
2-1
2-2
2-3
2-5
2-6
2-6
2-7
2-8.1
2-10
2-10
2-12
2-16
2-27
2-31
2-32
2-34
2-35
2-38
2-40
2-40
2-41
2-41
2-42
2-45
2-47
2-48
2-50
2-51
2-54
2-56
2-57
2-59
2-59
2-60
2-60
Section 3
Removals
Cycle Clutch and Cycle Shaft Removal
Belt
Replacement
Rotate Spring Replacement •
Lower Ball Socket and Tilt Ring Removal.
Rotate Tape Repl acement .
Tilt Tape
Replacement.
Rotate Selection Differential Removal.
Tilt Selection Differential Removal
Differential Plate Removal
Selector Bail Removal.
Print Magnet Assembly Removal.
Latch Pusher
Removal.
Shift Magnet Assembly Removal
Backspace Rack Removal.
Shift Arm Removal.
Operational Cam Check Pawl
Escapement Cam Follower Removal.
Operational Cam Follower •
Operational Contact Removal
Operational Magnet Assembly Removal
Operational Latch Bracket Removal
Shift Cam Removal
Operational Shaft Removal •
Operational Interposer Bracket Removal
Carrier Shoe Removal.
Carrier and Rocker Removal.
Cycle CI utch Pulley Removal
Cycle Clutch Pulley Removal (Late)
Cord
Replacement.
Backspace
Spacing
Print Escapement
Shift or Enter
Tab
Mechanism
Carrier Return
Index
Section 4
Service Index
Operational Area in Output Mode
Operational Area •
Mal-Selection (Flow Chart) .
Extra
Cycles (Mechanical Keyboard Onl y)
Flicking (Mechanical Keyboard only)
Selection System Check forMal-Selection
Print Magnets, Print Area in Output Mode
Cycle Clutch Adjustments and "Special Notes!!"
Tapes
Keyboard Lockup
Transmit Errors .
3-1
3-2
3-4
3-4
3-5
3-6
3-6
3-7
3-7
3-8
3-9
3-9
3-10
3-10
3 ... 10
3-10
3-10
3-11
3-11
3-11
3-12
3-13
3-13
3-13
3-13
3-14
3-15
3-15
3-15
4-1
4-3
4-5
4-7
4-9
4-10
4-11
4-12
4-13
4-14
4-17
4-17
4-18
4-19
4-20
4-24
4-25
4-25

Form 225-3207-2
Page Revised 3/15/66
By FES S26-3001-0
Machine Lockup.
Fai Iure to Start .
Contact Assemblies
Tool List
Preventive Maintenance
Olsa
Olsa Service Hints •
Safety
Scoping Procedures with Olsa
Selectric I/O Specifications
4-26
4-26
4-27
4-27
4-28
4-29
4-29
4-30
4-30
4-32
Selectric I/O Modes of Operations.
Osc ilIoscope Interpretations
I/O Component Location .
Section 5
4-32
4-32
4-36
Console Reduced-Function Printing Unit
Lubrication
Adjustments·
Removals •
5-1
5-1
5-4

Section 1. Lubrication
GENERAL PROCEDURE
Power clean the printer with the covers removed. Clean the feed rolls, platen, and
deflector. Unless otherwise stated, all parts of the printer should be inspected and
lubricated once every three months. NOTE: Lubrication must be applied judiciously
to el iminate excessive quantities and prevent migration or spin-off into electrical con-
tacts.
LUBRICATION
Figures 1 through 7 show the points that require lubrication. The number references
require IBM #10. The letter references require IBM #23. Points that do not require
lubrication every three months are identified with the required frequency in the ref-
erence list. A rule of thumb should be "All bearing areas having a sliding motion
use
IBM #23 and all bearing areas having rotational motion use IBM #10 unless other-
wise specified".
Machines with power on 24 hours daily require more frequent lubrication than ma-
chines used for single-shift operation. The following areas are primarily affected
by idling time, since only the operational shaft is driven:
1. Motor and motor pulley
2. Cycle-clutch spring and arbor
3. Driven-pulley hub and bearing
4. Operational cam bearings
5. Right-hand operational shaft and shift cam bearing
6. Shift-clutch spring and arbor.
Since these machines are hot 24 hours daily, some lubricant evaporation can be ex-
pected in areas not driven during idling, however, they are not nearly so affected as
items 1 through
6. Where power is on 24 hoursdaily, we recommend lubricating these
items every six weeks·.
1-1

15
13
10
II
FIGURE 1. Bottom View Of The Printer
IBM #10
1. Cycle-clutch pawl
2. Selector bail roller pivots
3. Negative-five bail roller pivot
4. Actuating-arm pivots
5. Operational pull links
11. Cycle-clutch trip pivots
12. Switch or
contact latch pivots
13. Cycle-clutch trip-bail pivot points
14. Selector-latch bai I pivots
15. Pusher bail pivots
6. Pusher bail-arm pivots
7. Carrier-return actuating-arm pivot
8. Rotate-link pivots
9. Pusher-arm pivots
10. Negative-five link bearing
A. Operational-arm pivots
B. Selector-latch surfaces
1-2

FIGURE 2. Right Side Of The Printer
IBM #10 15. Index-link pivot
1. Platen-release pivot 16.
Carrier-retum-link pivots
2. Paper-release-lever pivots 17.
Operational-contact link-rod pivots
3. Rotate and tilt pulley bearings 18.
Contact-bail pivots·
4. Tab-rack support bearing 19.
RH pri nt shaft bearing
5. Copy-control eccentric pivot 20. Shift arm
6. Pulley-assembly pivots
7. Right-hand cord-pulley bea~ing
8. Escapement torque-bar pivot
IBM #23
9. Carrier-return unlatching-bellcrank pivot
10. Carrier-return unlatching-link pivot A. Guide-bracket sliding surface
11. Bellringer bail pivot B. Copy-control eccentric surface
12. Fi Iter-shaft bearing C. Carrier-return latch keeper
13. Operational-shaft bearing D. Shift clutch spring and arbor
14. Carrier-return
latch-keeper pivot
E. Paper release lever
1-3

FIGURE 3. Left Side Of The Printer
IBM #10
12. Wear-compensator pivots
1. Platen-release pivot
13. Cycle-shaft bearing
2. Copy-control eccentric pivot
14. Tilt link
3. Tab-rack support bushing
4. Rotate and tflt pulley bearings
5. Print-shaft bearing
IBM #23
6. Left-hand margin-rack bushing
7. Tilt-arm pivot A. Copy-control eccentric surface
8. Idler-gear bearings (lightly)
B. Guide-bracket sliding surface
9. Fi Iter-shaft bearing
C. Tab set/clear bellcrank
10. Rotate link D. Idler
gear teeth
11. Tab set/clear link pivots E. C1 and
C2 cam surfaces
1-4

FIGURE 4. Bock Of The Printer
IBM #10
l. Index-control lever {old style}
2. Motor bearings
All pivots and bearings in operational unit
J. Motor pulley and clutch assembly
1-5

(Fig. 5. Differential Mechanism)
IBM #10
1. Cycle-clutch latch pivot
2. Center bearing -#9
3. Carrier-return pulleys
4. Cycle-c1ufch check-latch pivot
5. Check-selector latch pivot
6. Tab-torgue-bar pivot
7. Feed roll bearings
8. Escapement-torgue-bar pivot
9. Latch pusher roller and pivot studs
FIGURE 5. Differential Mechanism
1-6
10. Surface of the escapement rack
11. All selector latch and differential mechanism pivots
12. Restore roller pivot
IBM #23
A. Cycle-clutch sleeve surface
B.
Cycle-clutch restoring cam and roller
C. Negative-five cam surface
D. Selector-cam surface and roller
E. Pusher baiI cam surface and arm rollers
F. Torgue bars (light film)
X., Cycle clutch (inside)

FIGURE 5.1 Improved Lubrication Machines
IBM #10
IBM #23
A. Cycle clutch (inside) (with grease gun).
B. Cycle clutch sleeve and restoring cam surfaces.
C. Operational cam surfaces, rollers, and drive ratchets.
D. R.H. bearing and shift clutch (inside) (with grease gun).
1. Latch restore roll er pivot.
2. Center Bearing.
3. C-5 cam follower roller.
4. Operational cam wicks and pawl pivots.
5. Operationa I shaft stabi I izer (sintered iron).
* Do not lubricate - oil impregnated, or self lubricating
1-6.1

FIGURE 6. Carrier Mechanism
(Fig. 6. Carrier Mechanism)
* Keep cartridge and spindles free of all lubricants
IBM #10
1. Tab-I ever pi vot
2. Tab-lever latch pivot
3. Rocker pivots
4. Detent pivots
5. Tilt-ring pivots
6. Lower ball socket
7. Print-cam roller bearing
8. Print-shoft wipers
1-7
9. Interposer-lever sl i.ding surface
10. Detent-lever bearings
11. Ti It be Ilcrank pivot
IBM #23
A. Tilt ring and ball joint
B. Ribbon-I
ift cam surface
C.
D.
E.
F.
Ribbon-feed ond detent cam surfoce
Print-cam surface
Ribbon-feed pawl
Ve
locity control plate pin

FIGURE 7. Operational Mechanism
IBM #10
1. Escapement-cam-follower roller
2. Print-shaft bearing
3. Escapement clevis
4. Spring-clutch arbor. Oil carriage return spring clutch
only when reassembly is necessary
5. Index pawl
6. Tab-torque-bar pivot
7. Power-tab bell crank-link ends and pivots
8. Feed-roll bearings
9. Escapement-shaft bearing
10. Operational shaft bearing
11 • Operational cam pivot (ratchet) (Use #23 when parts
are removed or repl.aced.)
FIGURE 8. Bottom View Showing Contact Location
1-8
Carrier-Return
Interlock Contact
FIGURE 9A. Right View Showing Contact Location
IBM #23
A. Operational-cam surfaces, rollers, and drive ratchets
B. Actuating arm and check-pawl' contact surface
C. Torque-limiter spring clutch*
*Every 6 months / 1 Shift Operation
Every 3,months / 2 Shift Operation
Every 6 weeks /3 Shift Operation
PRINTER CONTACT LOCATIONS
Figures 8 to 12 show the locations of the printer contacts.
FIGURE 9B. Right View Showing Contact Location

PRINT FEEDBACK
CONTACTS (CI,C2)
TAB INTERLOCK
CONTACT
FIGURE 10. Left View Showing Contoct Location
FIGURE 12. Upper Left Rear Corner Showing Contact Location
RRIER RETURN
NTERLOCK
FIGURE 11. Rear View Showing Contact Location
1-9
C2
CI

INSPECTION PROCEDURE
Inspection
Period
2
3
4
FIRST INSPECTION PERIOD
CYCLE CLUTCH
Inspection Area
Cycle Clutch
Tilt Mechanism
Ribbon Feed Mechanism
Impression and Alignment
Rotate Mechanism
Detenting
Selection Magnet Units
Cycle Clutch Ilnlatching
Operational Magnet Units
Pusher Unit
Contact Cleanin!?
Escapement
Motor Drive and
Carrier Return
Indexing and Paper Feed
Shift (Enter Mechanism)
1. Latch height: Measure with #3 scribe line on Hoover-
.ometer.
2. Cycle shaft collar: The cycle clutch shoul~·begin to \
slip approximately 150 before the check pawl detents.
Hand cycle the machine, using a -5 rotate; O-tilt char-
acter.
3. Nylon stop: Ad just for four degrees rotation or over-
throw when the cycle shoft is latched home.
4. Shaft end play: .001" - .003".
5. All gears: Minimum play, no binds, screws tight.
6. Print-shaft timing: The keyway should be toward the
dowel pin on the carrier.
TILT MECHANISM
1. Check the tilt motion: Use TO and T3.
2. Check the tilt detenting: Use a T3 character and hal f-
cycle the machine. Place a slight pressure on the rear
of the tilt ring. Remove the detent, and allow it to re-
turn slowly. The ring should move ~o more than .005".
RIBBON FEED MECHANISM
1. A -5 rotate, I-tilt character should strike the ribbon
1/16" from the bottom in the high lift position.
2. Check for enough tension of the ribbon-feed mechanism-
ratchet-brake springs to hold the ribbon ratchets in a
rotated position, to overcome positively the action of
the centering spring.
3. The ribbon-feed pawl should hold the reversing inter-
poser within .005" - .010" of its total travel with the
ribbon-feed cam on its high point and the ribbon mech-
anism set for a reversing operation. Positive two-tooth
feed plus .010" overthrow should result.
SECOND INSPECTION PERIOD
DYNAMIC CHECK
1. a. Move the roller to the top of the compensator.
b. Repetitively type minus-five selections. The roller
should return to rhe compensated position. If wear
has caused the compensator foller to drop almost to
the bottom of the slot, hal f-cycle a -5 character.
Ti It the machine up on its back. Raise the nylon
wedge
manually, and tighten the rotate link until
there is 1/16" travel left in the nylon wedge.
Tighten the nuts on the rotate I ink. Note: The
compensator nylon wedge must be
clean and free of
oi I. If it does not drop easilyI or appears to be
oily or dirty, flush the wedge with cleaning fluid
and wi pe dry.
2. The general condition of all selection and outout-motion
adjustments can be checked by making a complete strike-
up of the keyboard. Type back over it several times,
watching for signs of misalignment with the previously
typed
characters. If alignment is not satisfactory, the
need for closer inspection can be met by observing the
dynamic detenting action of the typehead.
Manually half-cycle the following selections one at a
time, and observe the latches:
O-rotate, 1 -ti It character
-5 rotate, l-ti It character
+1 rotate, O-tiIt character
+2 rotate, O-tilt character
+3 rotate, O-tilt character
These characters allow each latch to be checked in-
dividually. Observe that the selected latches clear
the bail fully, and do not snap off. Observe that the
nonselected, or operated, latch seats fully on the bail,
does not jump Offi and makes the correct selection.
IMPRESSION AND ALIGNMENT
1. The rotate and ti It tapes must be free from kinks and
nicks.
2. Check for binds or excessive play in the tilt and rotate
detents with respect
to their guides. Check the tilt ring
in
relation to its pivots, and the upper ball socket with
respect
to the ti It-ring spacer.
3. Check for smooth compensator action.
Static check:
a. Half cycle a -5 selection with the typehead removed.
b. Pull the rotate arm out until it is completely removed
from the compensator leaf spring.
1-10
c. Release the rotate arm. This should cause the leaf
spring to collapse against the power frame.
ROTATE MECHANISM
1. Half-cycle a O-rotate, 3-tilt character and observe the
detenting. Folloy, the same procedure for a +5 rotate,
3-tilt character I a -3 rotate, 3-tilt character I and a -5
rotate I 3-tilt character.
The variance in bandwidth of these characters should not
exceed .030".

Note: Check as follows. Half-cycle the character and
remove detent from the head. Take the play out of th-e
head in a clockwise direction. Allow the detent to re-
turn slowly, and observe the point the detent strikes or
enters
the skirt. Bandwidth equals the difference between
the best and worst character.
DETENTING
I
1.
\
2.
Print-shaft timing: The detent must enter and leave the
head without hitting the skirt. Check by manually hal f-
cycling. Use a -5, home, and a +5 character.
The skirt clearance should be .025" - .035" in a 2-tilt
position. When both dp.tents are engaged fully in their
respective notches, there should be .001" minimum mo-
tion of the detent-cam follower with respect to the detent
lever.
THIRD INSPECTION PERIOD
)
SELECTION MAGNET UNITS -- SCOPE PROCEDURE
,\. Check the pick times of all magnets by observing (on an
osci lIoscope)
the voltage rise across a 1O-ohm, 1/2 watt
resistor (part 321271) in series with the individual magnet
coiIs, when a
48-volt pulse is applied to the coi \. All
pick times must be
ten milliseconds Qr less, with the ex-
ception of U.C. shift magnet, red ribbon shift magnet
and
the keyboard-lock solenoid. The U.C. shift magnet
and red ribbon shift magnet armatures must seal within 12
milliseconds maximum and
the keyboard lock solenoid
must pick in a maximum
of 55 milliseconds. See Figure
13 for wave
form of magnet pick time.
Pick-time readings are the best indicator of magnet per-
formance. High pick times foretell adjustment discrepan-
cies, wear, or sluggishness. They are often evidenced
by noticeable machine slowness when repeat operations
are performed. Note the following items when high pick
times
are encountered:
a. With the armature manually attracted, an armature-
to-yoke clearance of •001" - •006" is necessary to
prevent an armature from rocking on the yoke. Care-
fully check the pivot points for Wear (pivot plate ad-
justment) •
b. Except in the case of the operational magnets, the
armature stops are to be adjusted for a .004" - •008"
armature-to-yoke clearance. This clearance must be
maintained
to prevent permanent residual effects in
the armature.
c. In no case should an armature rock on the core.
I PICK or SEAL I-
~ TIME
FIGURE 13. Waveform of Magnet Pick Time
1-11
CYCLE CLUTCH UNLATCHING
1. Positive unlatching of the cycle clutch must occur when
each armature is operated by hand, with the latch over-
throw .002" - .007" (old style trip mechanism). On the
spring-loaded (new style) trip mechanism, overthrow
(with an armature operated) should measure
.005" - .020"
between the trip lever and the latch lever. Check to in-
sure that the K.O. eccentrics do not choke off the arma-
ture travel (K.O. eccentrics should clear trip bail exten-
sions by •003" - •008" with armatures manually attrocted).
2. Check for .005" - .010" vertical clearance between the
selection-armature latching surface and the pushers, and
for
.001" - .010" horizontal between the tip of the push-
ers and the armatures.
3. The trip bail pivot eccentrics must allow equal motion to
be transmitted
from the T2 and R5 armatures to the trip
link. The eccentrics must be in the upper sphere of their
adjustment to prevent binding.
OPERATIONAL MAGNET UNITS
1. When an armature is operated, the armature pull-link ad-
justment should allow for positive interposer tripping with
.002" - •
01 A" overthrow clearance between the interposer
and the pawl guide
plate at the point of unlatching.
PUSHER UNIT
1. Both latch-pusher cam-follower rollers must contact the
cams on the selector cam shaft throughout a cycle.
2. Check the individual pusher-to-Iatch extension clear-
ances. Clean all operaHonal circuit-breaker contacts,
and check for pitting.
CONTACTS
1. The operational transmitting contact latches should be
flush with the end of the contact-strap stop (interposers
latched), and should have .005" - .015" clearance be-
tween the contact-strap stop and the latch (interposers
unlatched) •
2. There shou Id be .002" - •010" clearance between the
print-feedback O/S's and the low point of the feedback
cams.
3. The tab interlock microswitch should move at least .031"
after the switch has transferred when the tab torque bar
is moving toward its rest position. The switch must
re-
main transferred during tabulation and must transfer before
the backspace cam reaches its high point.
4. The carrier-return-interlock (normally-open) strapshould
rise a minimum
of .010" off its support terminal with the
carrier-return-clutch latch latched.
5. Check the timing and air-gap adjustments on all contacts.
All transmitting and checking contacts should have:
a. .020" air gap except the shift which is .040".
b. All circuit-breaker contacts and interlocks should
have a
.040" air gap.
CONTACT CLEANING
Caution: Under no condition should contact files, burnishing
blades
or similar tools be used to clean contacts in this machine.
To clean the contacts, use IBM Contact Cleaner and clean bond
paper.

FOURTH INSPECTION PERIOD
ESCAPEMENT
1. The carrier should escape smoothly and positively through-
out the full length of the writing Iine and through the right-
hand margin under letter escapement, spacebar operation,
and tabulation.
2. Check for frayed or loose transport cords.
3. Tension should be maintained on the right-hand transport
pulley to maintain its mounting parallel to the power
frame. Its outside flanges should be
1-7/32" from the
right-hand outside surface of the power frame.
4. The line-gage holder must clear the platen at all points,
and not impede
carrier motion.
5. A minimum of .010" clearance should exist between the
carrier-return shoe and the spring-clutch. Note, however,
that excessive clearance can result in erratic carrier-
return motion.
6. Check for 1/2-3/4 pounds of mainspring tensiqn measured
at the carrier as it escapes through the linelock load at
the extreme right-hand margin.
7. Check for .002" - .004" backlash of the tab gOVElrnor and
carrier-return pinion gears with the escapement gear;
8. Letter escapement should occur as soon after print as pos-
sible.
9. The trigger guide should disengage the trigger from the
escapement-torque-bar arm when the escapement pawl
has
cleared the rack by .010" - .015". Both the letter-
escapement and the spacebar operation should allow
.005" - .010" excess motion after the trigger has dis-
engaged the trigger from the torque-bar arm.
10. When operated, the tab lever should overthrow the tab-
lever latch by .005" - .010" without being choked off
by
the tab torque-bar lockout lug or backup eccentric,
and without overthrowing into the tab rack. Observe the
operation at both ends and the middle of the torque bar.
Dynamically check for tab failures using five irregularly
set tab stops for at least five columns.
11. Check to make sure that the carrier-return operation un-
latches the tab when both operations occur simultaneous-
ly.
12. With the backspace operated manually, the escapement
pawl should just fail to get a new tooth on the escape-
ment rack.
13. There should be a clearance of .005" - .015" between
the front of the backspace pawl and a tooth of the back-
space rack (with the carrier at rest).
14. Overthrow clearance of .010" - .020" is required be-
tween the interposer pawls and the operational-latch
bracket wh'en the operational cams are on their high
point.
MOTOR DRIVE AND CARRIER RETURN
1. Check for adequate tension of the motor-pulley belt, or
for a frayed
or noisy belt.
2. The selector and operational cam shafts, and the print
and
filter shafts, must have .002" end play.
3. There must be freedom from binds in the idler gear train
with minimum backlash.
4. With the carrier-return cam on its high point, the carrier-
return arm should overthrow its keeper by .020" - .030" .
5. The carrier-return brake shoe should cause the carrier-
return spring clutch to drive the carrier no later than
when the escapement pawl clears the last one-third of
the escapement rack tooth. The clutch shoe should
overlap the last three coils of the spring clutch.
6. The carrier-return unlatching link must positively un-
latch the carrier-return latch at the left-hand margin
with
.005" - .010" overtravel when the margin-rack
overbank
is set.
7. The escapement pawl must not drag the escapement rack
during
carrier-return operations.
8. Measure one-half to one pound tension of the shock un-
loader at the left-hand margin while unlatching the
carrier-return keeper-latch arm.
INDEXING AND PAPER FEED
1. Check for. 015" - .030" clearance between the platen
ratchet and the index pawl, at rest.
2. Index operation should result in one full-tooth motion of
the index pawl with respect to the platen ratchet (in
single-linespace position) and two full-teeth motion
with no
evidence of hesitation or drag (in the double-
Iinespace position).
SHIFT
Check the cam and spring for rust. Turn power on, and hold
the shift ratchet (grey section). Release the ratchet by press-
ing
the magnet. Allow the ratchet to rotate slowly while
holding down on the
magnet. The shift cam should stop at a
fully detented position for each 1800 operation. The white
nylon
roller should seat fully in cam notch.
1-12

Section 2. Adjustments
ADJUSTMENT THEORY This adjustment is extremely important because the rollers
on the latch bai I MUST contact their respective selector
MOTOR AND DRIVE cams at the same point and with the same pressure in ord.
er to insure tha"t both cams operate the bail together.
1. Drive Belt -Adjust the motor mounting brackets forward
or back to obtain a minimum amount of belt noise.
Both ends of the motor must be adjusted the same in order
to maintain the rotor shaft perpendicular to the drive belt.
The
belt must never be so loose that jumping cogs on the
motor pulley is a possibility. Check by operating the
shift mechanism while holding the carrier with the car-
rier return in operation. This loads the motor to a point
where failure will be most
probable.
2. Motor Pulley -Adjust the motor pulley left or right so
that the drive belt rides fully on the teeth of both pul-
leys without rubbing the flange of either. Position the
retaining clip for .005" to .015" end play.
3. Motor Clutch Pawl Stops (Fig. 1) - Form for a clearance
of .010" to .020" between the clutch pawl tip and pul-
ley ratchet when the pulley is manually rotated.
Form This Tip
FIGURE 1. Motor Clutch Pawls
4. Idler Gears -Adjust the idler gear studs so that minimum
backlash
is present between mating gears. The mechan-
ism must be free of binds throughout 3600 rotation of the
gears.
Minimum backlash is necessary to prevent erratic opera-
tion of the drive train and to insure minimum overthrow
of the driven shafts.
The lower idler gear must be adjusted first because the
upper idler gear is adjusted to the final position of the
lower gear.
CAUTION: After any removal and replacement of the
left hand cycle shaft bearing, the mesh of the lower id-
ler gear must be checked. The lower idler gear stud is
mounted to the bearing plate; therefore any slight rota-
tion of the plate wi 11 affect the gear mesh.
Selection Mechanism
5. latch Bail Shaft -Adjust the plate that supports the right
end
of the bail shaft so that the bail shaft is parallel to
the cycle shaft.
2-1
The bail shaft is set at the factory and should not require
a readjustment
un less the plate becomes loosened or
parts replacement is necessary. This is a difficult ad-
justment to make and should not be loosened unless ab-
solutely necessary.
The bail shaft
plate must be adjusted both vertically and
horizontalIy in order to make the rollers of the latch bai I
ride their respective cams equally. Changing either the
vertical or horizontal position will affect the other;
therefore both adjustments must be considered
together
and adjusted alternately until both are correct. If a re-
adjustment is necessary, the following procedure may be
used.
a. The correct vertical position is obtained by raising
or lowering
the bail shaft mounting plate until both
bail rollers have
equal pressure against their re-
spective cams. Check by testing the drag on strips
of paper inserted between the rollers and the cams.
b. The front to rear position of the bail shaft plate can
be set relative to the cycle shaft. Set the Hoover-
ometer to span
the distance between the cycle shaft
and the left end of the bail shaft as illustrated in
Fig.
2. Move the Hooverometer to the right (;md
adjust the bai I shaft plate forward or back to the
same clearance as at the left side. With the baiI
shaft parallel to the cycle shaft, the bai I rollers
should be
contacting their respective cams at the
same point.
NOTE: As a final check for the adjustment of the latch
bail plate, hand cycle the machine using a zero rotate,
zero ti It character (a II latches removed from the bai I) •
Both latch 'bai I rollers should maintain contact with their
respective cams throughout the cyc Ie.
CAUTION: On early level machines the cycle bai Istop
and the character interrupter must be readjusted after any
change in the position of the bail shaft plate, because
both of these parts are mounted on the plate.
,--
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FIGURE 2. Latch Bai I Shaft Plate Adjustment