IBM Selectric Maintenance Manual page 75

b. Hand cycle a carrier return operation. With the
clutch latch moving through its arc, the lug on the
clutch latch should engage the lug on the latch bell-
crank by the thickness of the metal of the latch bell-
crank lug (Fig.
150.6) .
Engage The Thickness
Of Metal
FIGURE 150.6 Margin Rack Latch Bellcrank Bracket
NOTE: Increased motion of the margin rack latch
bellcrank may be obtained by increasing the engage-
ment of the lugs.
9. Margin Rack Latch Link - Adjust the margin rack latch
I ink to el iminate lost motion in the mechanism when the
machine is at rest and the margin rack is latched.
10.
Carrier Return Clutch Latch Keeper - The clutch latch
keeper stop should be adjusted to I imit the engagement of
the keeper with the clutch latch to
.040"
(Fig.
150.7) .
11. Air Cylinder Lever Mounting Bracket - Adjust the air
cyl inder lever mounting bracket front to rear so the air
cylinder lever is aligned with the slot in the air cylinder
shaft.
12.
Air Cyl inder - Adjust the air cyl inder mounting bracket
left or right on its mounting screws so that with the car-
rier held to the extreme left, the air cylinder plunger is
.080" to .100" from bottoming in the cyl inder.
NOTE: Adjustments 11 and 12 ensure that the air cyl-
inder mechanism will not bind or choke off carrier move-
ment at the left margin (Fig.
150.8).
FIGURE 150.8 Air Cylinder Mounting Bracket
13. Air Cylinder Orifice - The air cylinder orifice is adjust-
ed and sealed at time of assembly to provide the most uni-
form deceleration of the carrier at the left margin. Be-
fore any attempt to change th is adjustment, check for
proper torque limiter adjustment and for binds in the air
cylinder mechanism. If adjustment is necessary, the left
hand orifice should be adjusted first. Approximate set-
tings are: full open on left hand orifice and 1/2 open
on right hand orifice.
Too much air cylinder action or cushion can cause timing
problems due to the delay of C.R. unlatch ing. This prob-
lem would be more prevalent on printers operating opeh-
end.
INDEX MECHANISM
1. All operational control adjustments must be correct be-
fore any attempt is made to adjust the index mechanism.
2.
Multiplying Lever Stop (Fig.
151) -
Adjust the multiply-
ing lever stop front or rear to produce
.360"
to
.375"
(approximately
3/8")
motion to the index link when the
carrier return/index cam is operated to its high point
(platen removed).
NOTE: This adjustment may be measured with the
Hooverometer and a feeler gauge. The handle of the
FIGURE 150.7 Carrier Return Clutch Latch Keeper Stop Hooverometer is .375" wide.
2-45.4