Shift Or Enter - IBM Selectric Maintenance Manual

No
Adjust Linkage
Keyboard Lock
Shift Clutch Overdrives 4.2
Shift Link Bent
No
SHIFT OR ENTER
Yes
No
Interlock Adjustment 4.3
Filter Shoft 4.6
Cycle Shoft Overthrow 4.5
Figure 4.0
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
SHIFT OR ENTER
Shift (or Enter) Adjustments
The shaft end play should be .002" - .004". If the
Shift Arbor comes laose, a new set screw is avai
l-
ab Ie (PN
257969)
whi ch wi II lock the arbor securely
on the shaft.
The Shift Ratchet should rotate
.02S" - .059"
when
re leased. Under power, the Shift Cam shou Id reach
a detented position with the detent held away from
the Shift Cam. See S.H.
4.10.
. 040" - .060"
clearance between the ratchet and the
interlock. Adjust the Interlock Cam.
. 002" - .OOS"
clearance between the Upper Case
(U.C.) Armature and the Release Arm Pin. See S.H.
4.9.
The cycle shaft overthrow should be
.007"
to
.015"
(1 to 3 degrees) .
With an interposer latched down and the Fi Iter Shaft
Gear held in a driven direction, there should be
.010'
- .015"
clearance between the Interposer and the
Fi Iter Shaft Blade. If the fi Iter shaft timing is wrong,
the Shift Interlock Cam shou Id be checked and read-
justed. (Adjustment 4.3).
Binds in the Sh(ft Cam may be caused by maladjust-
ment of. the Shift Back-up Roller. Adjust for
.002" -
.004"
clearance between the cam in lower case. A
Spring Hook Pusher end may be used to adjust the
Back-up Roller eccentri c stud.
4.S
4.9
4-7
No
Yes
Yes
Yes
Armoture to Releose Lug Clearonce 4.4
Shift Arbor Loose or Worn 4.1
Spri ng C I utc h Broken
Com Binds 4.8
Ratchet Binds or C Clip Missing 4.7
S.H. SHIFT LOCK-UP IN UPPER CASE
There is a possibi lity that the shift mechanism may
lock when shifted to an upper case position, prevent-
ing release to lower case from the keyboard. This is
caused by an accumulation of grease on the shift re-
lease arm stud and the upper case armature. When the
shift release arm travels to an upper case position,
the grease accumu lati on pu lis the upper case armature
along with it. The armature is then latched in upper
case position, holding the shift mechanism in upper
case. Any attempt to un lock it from the keyboa rd
is futi Ie since the lower case armature must fi rst be
activated to un latch the upper case armature .
On the next inspection or when this trouble occurs,
the shift release arm and upper case armature shou Id
be cleaned thoroughly of all grease .
S.H. SHIFT CLUTCH SPRING ADJUSTMENT
1. Install shift clutch spring; allow the retaining
plate screws to remain loose.·
2. Place shift cam in Upper Case position and hold
in detented position.
3. Install clutch ratchet (Upper Case position) so
that its lug is toward the front of the machine
ahead of the release arm lug.
4. Manua Ily rotate the ratchet (c lockwise) unti I
the shift release arm lug now lies directly under
the mi dd Ie of the clutch ratchet lug. The shi ft
clutch spring and retaining plate will slip to.a
new position as this is accomplished.