IBM Selectric User manual

OPD CUSTOMER ENGINEERING
Selectric
I/O Reference Manual
Section 1
Reprinted July. 1966
FIN 241-5308-0
A II rights to reproduce this material are reserved by IBM.

CONTENTS
LUBRICATION SECTION 1
Page
General Procedure ........................................... 1
Lubrication Procedure ......................................... 1
Improved Lubrication Machines ............................•.... 7
Printer Contact Locations ...................................... 9
Inspection Procedure ........................................ 11
First Inspection Period ....................................... 11
Second Inspection Period ..................................... 12
Third Inspection Period ....................................... 12

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 four months.
Note: Lubrication must be applied judiciously to eliminate excessive
quantities and prevent migration or spin-off into electri cal contacts.
LUBRICATION
Figures 1 through 8 show the points that require lubrication. The number
references require I BM #10 • The letter references requ ire IBM #23. Poi nts
that do not require -Iubri cation every four months are identified with the
required frequency in the reference list. A rule of thumb should be IIAII
bearing areas having a sliding motion use IBM #23 and all bearing areas
having rotational motion use IBM #.10 unless otherwise specified .11
Machines with power on 24 hours daily require more frequent lubrication
than machines 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 dai I y, some Iubri cant evaporati on
can be expected in areas not driven duri ng id Iingi however, they are not
nearly so affected as items 1 through 6. Where power is on 24 hours daily,
we recommend Iubri cati ng these items every si x weeks.
1-1

2 B C A
4
15
7
II
13
14
20
F 20 19 16
13
17
12
Figure 1. Bottom View Of The Printer
IBM #10
/./1. Power-tab key-lever bai I pivots
2. Clevis and link pivots
3. Keyboard-lockout bellcrank pivot
4. Keyboard-lockout bail pivots
,5. Cycle-clutch pawl and link pivots
/'-6. Keyboard-lockout bai I roller and lever pivot
Y7. Selector bai I roller pivots
VB. Negative-five bai I roller pivot
;,/ 9. Actuating-arm pivots
i~lO. Operational pull Iinks
.... 11. Pusher bail-arm pivots
"'..-'12. Carrier-return actuating-arm pivot
v13. Rotate -Iink pi vots
Y14. Pusher-arm pivots
V15. Selector-latch bai I pivots
/
!/ 116.
/17.
118.
i 19.
i20.
Negative-five link bearing
Cycle-clutch trip pivots
Contact-latch pivots
Cycle-clutch trip-bail pivot points
Pusher bai I pivots
IBM #23
;/ A. Keyboard-lockout-comb sliding surface
j B. Interposer sliding surfaces
/C. Cycle-clutch latch surfaces
I D. Fi Iter-shaft surface
1 E. Operational-arm pivots
r F. Selector-latch surfaces
1-2
2
3
5
4
6
0
E
8
10
9
18

II
10
9 6
20
7 3 8 A 4
12
o
13
17
Figure 2. Right Side Of The Printer
)BM #10
"'1.
r2.
,:/3.
74.
,/5.
6.
V 7.
~B.
/9.
v'10.
1I1l.
V}2.
.(13.
/14.
i
15
.
16.
Platen-release pivot
Paper-release-lever pivots
Rotate and tilt pulley bearings
Tab-rack support bearing
Copy-control eccentric pivot
Pulley-assembly pivots '~'
Right-hand cord-pulley bearing
Escapement torque -bar pivot
Carrier-return unlatching-bellcrank pivot
Carrier-return unlatching-I ink pivot
Bellringer bail pivot
Fi Iter-shaft bearing
Operational-shaft bearing
Carrier-return latch-keeper pivot
Index-I ink pivot
Carrier-return-I ink pivots
17.
/lB.
Yf9.
/'LO.
Operational-contact I ink-rod pivots ~2..
Contact-bai I pivots ___
Shift arm pivot
Print shaft bearing
IBM #23
~) V;A.
lB.
C.
tI D.
1-3
Guide-bracket sliding surface
Copy-control eccentric surface
Carrier-return latch keeper
Shift clutch spring and arbor
2
B
16
15
14

llBM #10
1. Platen-release pivot
Y .. 2. Copy-control eccentric pivot
I; 3 . T ab-rac k support bushing
Ii, 4. Rotate and ti It pulley beari ngs
,} 5. Print-shaft bearing
y 6. Left-hand margin-rack bushi ng
f7. Tilt-arm pivot
vB. Idler-gear bearings (lightly)
1/ 9. F,ilter-shaft bearing
1110. End-of-line bail
.V 11. Tab set / clear 1ink pivots
'\ 12. Wear-compensator pivots
V 13. Cycle-shaft bearing
Figure 3.
Left Side Of The Printer
1-4
Jli 4. Ti It I ink pivot
/15. Rotate link
V16. Rotate arm paddle eccentric
IBM #23
V' A. Copy-control eccentric surface
VB. Guide-bracket sl iding surface
IfC. Tab set/clear bellcrank
v D. Idler gear teeth
E. C 1 and C2 can 1 surfaces
* Keep free of any lubricants

Figure 4. Back Of The Printer
IBM #10
1. Index-control lever (old style)
2. Motor bearings
All pivots and bearings in operational unit.
3. Motor pulley and clutch assembly.
1-5

II
12
G F
10
9
;;.....;;.------3
B~~-9
3
6
8
-=-----7
Figure 5. Differential Mechanism
IBM #10
1. Cycle-clutch latch pivot
2. Center bearing
3. Carrier-return pulleys
4. Cycle-clutch checK-latch pivot
5. Check-selector latch pi vot
6. Tab-torgue-bar pivot
7. Feed-roll bearings
8. Escapement-torgue-bar pivot
9. All selector latch and differential mechanism pivots
10. Latch pusher roller and pivot studs
II. Rotate bellcrank
12. Balance arm
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-bai I cam surface and arm rollers
F. Surface of the escapement rack
G. Torgue bars (light film)
H. Cycle-clutch (inside)
1-6

Figure 6. Improved Lubrication Machines
IBM #JO
IBM #23
A. Cycle clutch (inside) (with grease gun).
1. Latch restore roll er pivot.
B. Cycle clutch sleeve and restoring cam surfaces.
2. Center ~c>aring.
C. Operationa I cam surfaces, roll ers, and drive ratchets.
3. C-5 cam follower roller.
D. R.H. bearing and shift clutch (inside) (with grease gun).
4. Operational cam wicks and pawl pivots.
5. Operational shaft stabilizer (sintered iron).
* Do not lubricate - oil impregnated or self lubricating
1-7

Figure 7. Carrier Mechanism
* Keep cartridge and spindles free of all lubricants
10. Detent-lever bearings
IBM #10
11. Tilt bellcrank pivot
1. Tab-lever pivot
2. Tab-lever latch pivot
3. Rocker pivots
IBM #23
4. Detent pivots
A. Tilt ring and ball joint
5. Ti It-ring pivots B. Ribbon-lift cam surface
6. Lower ball socket
C. Ribbon-feed and detent cam surface
7. Pririt-cam roller bearing
D. Print-cam surface
8. Print-shaft wi pers
E. Ribbon-feed pawl
9. Interposer-lever sl iding surface
F. Ve locity control plate pin
1-8
7
8
6
o
E

6
c
II
Figure 8. Operational Mechanism
IBM #10
1. Right-hand margin-rack bushing
2. End-of-I ine contact-actuating pivots
3. Escapement-cam-follower roller
4. Print-shaft bearing
5. Escapement clevis
6. Spring-clutch arbor. Oil carriage ref'urn spring clutch
only when reassembly is necessary
7. Index pawls
8. Tab-torque-bar pivot
9. Power-tab be II crank-I ink ends and pivots
10. Feed-roll bearings
11. Escapement-shaft bearing
12. Operational cam and RH bearing
13. Operational cam pivot
IBM #23
A. Operational-cam surfaces, rollers, and drive ratchets
B. Actuating arm and check-pawl contact surface
C. TorquC'-limiter spring clutch
1-9
PRI NTER CONTACT LOCATIONS
Figures 9 to 13 show the I ocat ions of the pri nter contacts.
CONTACT AND
LATCH ASSEMBLY
Figure 9. Bottom View Showing Contact Location
CARRIER -RETURN
INTERLOCK CONTACT
.. 1,
~ I
FEEDBACK SHIFT
CONTACT TRANSMIT
(C3,C4 CONTACT
Figure 10. Right View Showing Contact Location

PRINT FEEDBACK LAST COLUMN
CONTACTS (CI ,C2) CONTACT
Figure 11. Left View Showing Contact Location
TAB INTERLOCK
CONTACT
Figure 13. Upper Left Rear Corner Showing Contact Location
Figure 12. Rear View Showing Contact Location
1-10

INSPECTION PROCEDURE
Inspection
Period Inspection Area
2
3
Impression and Alignment
Tilt Mechanism
Rotate Mechanism
Detenting
Keyboard Area
Selection Magnet Units
Operational Magnet Units
Pusher Unit
Cycle Clutch Unlatching
Cycle Clutch
Contacts
Contact Cleaning
Ribbon Feed Mechanism
Escapement
Motor Drive
and Carrier Return
Indexing and Paper Feed
Shift (Enter Mechanism)
FIRST INSPECTION PERIOD
IMPRESSION
AND ALIGNMENT
1. The rotate and tilt tapes must be free from kinks and nicks.
2. Check for binds or excessive play in the, tilt and rotate de-
tents with respect to their guides. Check the tilt ring in
relation to its pivots, and the upper ball socket with re-
spect to the tilt-ring spacer.
3. Check for smooth compensator action.
Static check:
a. Hal f-cycle a -5 selection with the type head removed.
b. Pull the rotate arm out until it is completely removed
from the compensator leaf spri ng.
c. Release the rotate arm. This should cause the leaf
spring to collapse against the power frame.
DYNAMIC CHEC K
1. a. Move the roller to the top of the compensator.
Repetitively type minus-five selections. The roller
should return to the compensated position. If wear
2.
b.
has caused the compensator roller to drop almost to
the bottom of the slot, haI f-cycle a -5 character.
Tilt 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. Tight-
en the nuts on the rotate link. NOTE: The com-
pensator nylon wedge must be clean and free of oi I.
If it does not drop easily, or appears to be oily or
dirty, flush the wedge with cleaning fluid and wipe
dry.
The general condition of all selection and output-motion
adjustments can be checked by making a complete strike-
up of the keyboard. Type back over it several times, watch-
ing for signs of misalignment with the pr<aviously typed char-
acters. If alignment is not satisfactory, the need for closer
inspection can be met by observing the dynamic detenting
action of the typehead.
1-11
TILT MECHANISM
1. Check the tilt motion: Use TO and T3.
2. Check the tilt detenting: Use a T3 character and half-
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 no more than. 005".
ROTATE MECHANISM
1. Half-cycle a O-rotate, 3-tilt character and observe the
detenting. Follow the same procedure for a +5 rotate
3-ti It character, a -3 rotate, 3-:ti It character, and a '-5
rotate, 3-tilt character.
The variance in bandwidth of these characters should not
exceed .030".
NOTE:
Check as follows: Half-cycle the character and re-
move detent from the head . Take the play out of the
head in a clockwise direction. Allow the detent to
return slowly, and observe the point the detent strikes
or enters the skirt. Bandwidth equals the difference
between the best and worst character.
DETENTING
1. Print-shaft timing: The detent must enter and leave the
head without hitting the skirt. Check by manually half-
cycling. Use a -5, home, and a +5 character.
2. The skirt clearance should be .025" - .035" in a 2-tilt
position. When both detents 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.
KEYBOARD AREA
1. All key levers operate freely. No binds.
2. All. key levers have enough travel to fully latch an inter--
poser and restore positively.
3. With any interposer latched down, the cycle-clutch-re-
lease pawl should clear its keeper by .002" - .008" (un--
latching adjustment).
4. The cycle-clutch-Iatch-pawl bite on the keeper must be
one-half the thickness of the keeper. Adjust the bail up-
stop.
5. The cycle-clutch-latch pawl overthrows the keeper by
.020" - .025" (under manual operation) when restoring.
6. Operational key levers should allow for positive single
operation.
Latch Selection. The latch Iinks should. allow the latches to
overhang the bail flush to .010" overlap.
Manually hal f-cycle the following selections one at a
time, and observe the latches:
O-rotate, 1 -ti It character
-5 rotate, l-tilt character
+ 1 rotate, O-tilt character
+ 2 rotate, O-tiIt character
+ 3 rotate, O-ti It character
These characters allow each latch to be checked individual-
ly. Observe that the selected latches clear the bail fully,
and do not snap off. Observe that the nonselected, oroper-
ated, latch seats fully on the bail, does not jump off, and
makes the correct selection.

SECOND INSPECTION PERIOD
SELECTION
MAGNET UNITS
1. Check the pick times of all magnets by observing (on an
oscilloscope) the voltage rise across a 10-ohm, 1/2-watt
resistor (part 321271) in series with the individual magnet
coils, when a 48-volt pulse is applied to the coil. All
pick times must be ten milliseconds or less, with the ex-
ception of U.C 0 shift magnet, red ribbon shift magnet and
the keyboard-lock solenoid. The U.C. magnet and red
ribbon shift magnet armatures must seal within 12 milli-
seconds maximum and the keyboard lock solenoid must
pick in a maximum of 55 milliseconds. See Figure 14for
wave form of magnet pick time.
.1 PICK or SEAL I-
-j TIME
Figure 14. Waveform 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.
OPERATIONAL MAGNET UNITS
1. When an armature is operated, the armature pull-link ad-
justment should allow for positive interposer tripping with
.002" - .010" 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 clearances.
Clean all operational circuit-breaker contacts, and check
for pitting.
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 mec;,hanism). On the
spring-loaded (new style) trip mechanism, overthrow(with
an armature operated) should measure .005" - .020" be-
tween the trip lever and the latch lever. Check to insure
thar the K. O. eccentri cs do not choke off the armature
travel (K.O. eccentrics should clear trip bail extensions
by .003" to .008" with armatures manually attracted).
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 bai I 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.
1-12
CYC LE C LUTC H
1. Latch height: Measure with #3·scribe line on Hoover-
ometer.
2. Cycle shaft collar: The cycle clutch should begin toslip
approximately 15
0
before the check pawl detents. Hand
cycle the machine, using a -5 rotate, O-tilt character.
3. Nylon stop: Adjust for four degrees rotation or overthrow
when the cycle shaft 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.
7. Filter-shaft timing: With an interposer latched down,
there should be .005" - .010" between the interposer
and the fi I ter shaft.
THIRD INSPECTION PERIOD
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 between the con-
tact-strap stop and the latch (interposers unlatched).
2. There should be .002" - .010" clearance between the print-
feedback O/Pls 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 remain
transferred during tabulation and must transfer before the
backspace cam reaches its high point.
4. The carrier-return-interlock (normally-open) strap should
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
~r similar tools be used to clean gold contacts in this
machine.
To clean the gold contacts, use IBM Contact Cleaner and clean
bond paper.
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 ro-
tated position, to overcome positively the action of the
centering spring.
3. The ribbon-feed pawl should hold the reversing interposer
within .005" - .010" of its total travel with the ribbon-
feed cam on its high point and the ribbon mechanism set
for a reversing operation. Positive two-tooth feed plus
.010" overthrow should result.

ESCAPEMENT
I. The carrier should escape smoothly and positively through-
out the full length of the writing line and through the right-
hand margin under spacebar operation and lobulation.
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 powerframe.
Its outside flanges should be 1-7/32" from the right-hand
outside surface of the power frame.
4. The I ine-gage holder must clear the platen at all points,
and not impede carrier motion.
5. A minimum of .015" 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 tension measured
at the carrier as it escapes through the linelock load at the
extreme ri ght-·hand margin.
7. Check for. 002" - .004" backlash of the tab governor 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 disengaged 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 opera-
tion at both ends and the middle of the torque bar. Dynam-
ically check for tab failures using five irregularly set tab
stops for at I east fi ve co Iumns.
11. Check to make sure that the carrier-return operation un-
latches the tab when both operations occur simultaneously.
12. With the backspace operated manually, the escapement
pawl should just fail to get a new tooth on the escapement
rack.
13. There should be a clearance of .005" - .015" between the
front of the backspace pawl and a tooth of the backspace
rack (with the carrier at rest).
14. Overthrow clearance of .010" - .020" is required between
the interposer pawls and the operational-latch bracket when
the operational cams are on their high point.
1-13
MOTOR DRIVE AND CARRIER RETURN
I. Check for adequate tension of the motor-pulley belt I 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 es-
capement rack tooth. The clutch shoe should overlap the
last three coils of the spring clutch.
6. The carrier-return unlatching link must positively unlatch
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 whi Ie unlatching the carrier-
return keeper-latch arm.
INDEXING AND PAP ER 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-
I inespace position) and two full-teeth motion with no evi-
dence of hesitation or drag (in the double-linespace posi-
tion) .
SHIFT
Check the cam and spring for rust. Check for the positive re-
lease of the ratchet when the key lever is two thirds down.
Turn power on, and hold the shift ratchet (grey section). Re-
lease the ratchet by pressing the key. Allow the ratchet to ro-
tate slowly while holding down on the key. The shift cam should
stop at a fully detented position for each 180
0
operation. The
white nylon roller should seat fully in cam notch.

OPO CUSTOMER ENGINEERING
Selectric I/O Reference Manual
Section 2
Reprinted July. 1966
FIN 241-5309-0
A II rights to reproduce this material are reserved by IBM.

CONTENTS
ADJUSTMENTS SECTION 2 Page
Motor and Drive ............................................. 1
Keyboard Section ............................................ 1
Latch Pusher
Assembly ........................................ 7
Print Selection Magnet Assembly, Early .......................... 7
Print Selection Magnet Assembly, Late ........................... 9
Cycle
Clutch Trip Mechanism, Late .............................. 10
Cycle Clutch Trip Mechanism, Early ............................. 11
Inhibitor .................................................. 11
Print Selection Contact Assembly ............................... 11.
Print Feedback Contact Assembly C1, C2 ........................ 12
Keylever Contacts ........................................... 13
Keyboard Lock Mechanism .................................... 13
Keyboard Lock Mechanism (Solenoid Operated) ................... 14
Shift Mechanism ............................................ 16
Shift Magnet Assembly ....................................... 20
Shift Contact Assembly ....................................... 22
Cycle Clutch
............................................... 23
Carrier and Rocker .......................................... 26
Alignment ................................................. 31
Print Mechanism, Early ....................................... 42
Print Mechanism, Late ....................................... 46
Escapement Mechanism ...................................... 51
Mainspring and Cords ........................................ 54
Operational Control Mechanism ............................... 55
Operational Magnet Assembly, Early ........................... 58
Operational Magnet Assembly, Late ............................ 59
Operational Contact & Latch Assembly (Unit Removed) ............. 61
Operational Contact & Latch Assembly (Unit Installed) ............. 61
Operational Contact & Latch Assembly, Late Style ................. 62
Operational Feedback Contacts ................................ 63
Spacebar Mechanism ........................................ 63
Backspace
Mechanism ....................................... 67
Carrier Return Mechanism .................................... 68
Index Mechanism, Late ....................................... 73
Index Mechanism, Early ...................................... 74
Tabulator Set and Clear Mechanism ............................ 75
Tabulator Mechanism, Late ................................... 76
Tabulator Mechanism, Early ................................... 78
Margin Control Mechanism ................................... 81
Last Column Contact ......................................... 85
Paper Feed Mechanism ...................................... 86
Fabric Ribbon
Mechanism ..................................... 88
Ribbon
Shift Mechanism ...................................... 89
Covers and Mounts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

ADJUSTMENT THEORY
MOTOR AND DRIVE
1.
2.
3.
4.
Drive Belt -Adjust the motor mounting brackets forward
or bOck to obtain a minimum amount of belt noise.
Both ends of the motor must be ad justed the same in order
tomaintain the rotor shaft perpendicular to the drive belt.
The belt must never be so loose that jumping cogs on the
motor pulley is a possibi I ity. Check by operating the
shift mechanism while holding the carrier with the carrier
return in operation. This loads the motor to a point where
failure will be most probable.
Motor Pulley - Adjust the motor pulley left or right so
that the drive belt rides fully on the teeth of both pulleys
without rubbing the flange of either. Positi.on the re-
taining cl ip for. 005" to .015" end play.
Motor Clutch Pawl Stops (Fig. 1) -Form fora clearance
of .010" to .020" between the clutch pawl tip and pulley
ratchet when the pulley is manually rotated.
Form This Tip
FI GURE 1. Motor Clutch Pawls
Idler Gears -Adjust the idler gear studs so that minimum
backlash is present between mating gears. The mechanism
must
be free of binds throughout 3600 rotation ofthe 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 idler
gear must be checked. The lower idler gear stud is mount-
ed to the bearing plate; therefore any sl ight rotation of
the plate wi II affect th~ gear mesh.
KEYBOARD SECTION
1. Filter Shaft - With the cycle shaft in the rest position,
the working surface of the filter shafl~ should clear a de-
pressed interposer by .005" to .010" (Fig. 2).
2-1
2.
Adjust by rotating the filter shaft to the correct position
after loosening the fi Iter shaft gear.
Filter Shalt ~)
.005" to .010"
AI I Backlash Removed
In This Direction
FIGURE 2. Filter Shaft Adjustment
All backlash of the gear train should be taken out forward
when checking the fi Iter shaft adjustment. This simulates
a powered operation in which the momentum rotates the
top of the fi Iter shaft to its extreme forward position.
Insufficient clearance between the filter shaft and the
interposers could allow the fi Iter shaft to stop just under
the rear of the interposers. The keyboard would then be
inoperative, because the interposers could not be de-
pressed.
Excessive clearance would delay the operation of the
interposers. The selector latches would not be pulled
forward until after having been pulled down slightly by
the latch bail. This would result in excessive wear and
a noisy operation as the latches were snapped forward
from
under the bai I.
CAUTION: Excessive clearance will also cause mal-
selection.
NOTE: Be sure to maintain .002" to .004" end ploy of
the filter shaft within the left hand filter shaft bearing.
The mounting of the left hand fi Iter shaft bearj.ng allows
.011" lateral play of the bearing. Do not confuse this
lateral play ofthe bearing with the fi Iter shaft end play.
Rear Interposer Guide Comb -Ad"just the interposer guide
comb up or down so there is .020" to .030" clearonce
between the bottom edge of the interposers and a vane
of the fater shaft (Fig. 3).
The four interposer guide screws are accessible by insert-
ingthe medium screwdriver between the letter keylevers,
beneath the front row of keybuttons.
CAUTION: Check the clearance at several points along
the filter shaft.
NOTE: The purpose of this adjustment is to prevent
"bridging". "Bridging"is a form of malselection caused
by two or more interposers being depressed in front of
the fi Iter shaft and driven forward at the same time.
Proper adjustment of the rear interposer guide comb al-
lows only one interposer to be positioned in the path of
the fi Iter shaft at one time. An easy method of check-

3.
4.
Adjust Interposer Guide
Loosen Four
Screws
------..4IQ1o..-'I
Interposer
.020" To .030"
FI GURE 3. Rear Interposer Guide Comb
ing the guide comb adjustment is to latch one interposer
down, depress an adjacent interposer until it is locked
out by the selector compensator, and then slowly hand
cycle the machine. The filter shaft should contact the
interposer that is latched down and miss the adjacent
'interposer by at least .005
11
• This check should be per-
formed at several places along the filter shaft.
WARNING: The selector compensator tube is mounted
to the rear of the interposer guide comb by four clamps
and must move up and down with the guide comb when
the guide comb adjustment is made. Be sure to loosen
the guide comb mounting screws completely before at-
tempting to move the gu'ide comb. Do not hammer the
guide comb into position asthis can cause the compensator
tube to shiftwith respect to the guide comb. The vertical
position of the tube on the guide comb is set with respect'
to the stop strap riveted along the bottc;>m of the guide
comb and should not be disturbed.
Bail Parallel
a. Loosen cycle bai I up stop and move it up out of the
way of the cycle bai I.
b. Adjust the left hand bail anchor plate forward or
back in its oversized mounting holes so that the
selector bails will be parallel to the lugs on the
interposers.
c. Adjust the bail anchor plate up or down so that the
cycle bai I will rest as evenly as possible on all the
interposers.
NOTE: The selector bails must be parallel to the inter-
poser lugs so that the same travel wilt be given to the
bai Is by the various interposers. A loss of motion to the
selector latches could result from an unparallel condi-
tion. The cycle bai I must be parallel so that t"he inter-
poser latch springs can be adjusted evenly.
Interposer Latch Springs (Preliminary) With the H inter-
poser latched down, adjust the left hand end of the right
hand section of latch springs so that there wi II be approx-
imately .015" remaining travel of the interposer before
it bottoms (Fig. 4). Check this clearance by pulling the
interposer down with a spring hook.
2-2
5.
Loosen To Adjust
Guide
.015
11
Approx.
FI GURE 4. Interposer Latch Spring Adjustment
Cycle Clutch Latch Bite - Adjustthe cycle clutch keeper
bracket forward or bOck so that the cycle cI utch latch
overlaps the step on the cycle clutch sleeve by .030
11
to
.035
11
(the thickness of the metal plate). (Fig. 5)
The overlap can readi Iy be observed from the bottom of
the machine.
Cycle Clutch Keeper
Bracket
.030II To. 035
11
-~I~f---
6.
FI GURE 5. Cycle Clutch Latch Bite Adjustment
Insufficient overlap could allow the cycle clutch sleeve
to ki ck past the latch and cycle again. Excessive over-
lap would sl ightly delay the unlatching action of the latch
and create a sluggish action.
Cycle Clutch L,atch Restoring
a. Late Style - Position the restoring roller so that the
latch pawl overthrows the keeper by .020
11
to .025
11
with the restoring cam on its high point. Check on
both restoring cam lobes and adjust on the lobe pro-
viding the least motion (Fig. 6).
Restoring Roller
.020" To .025"
Cycle Clutch I
Keeper ~~
Cycle Clutch
Latch Pawl
~d'J2
.~~
Do Not Overthrow Into Sleeve
FIGURE 6. Cycle Clutch Latch Restoring, Late Style