IBM Selectric - Page 153

No
o Interlock 5.3
Yes
Tab Lever Lockout 5.6
Tab Lever Latch 5.6
Tab Spring Off
Keylever Pawl 5.2 See Output Mode 8.0
TAB.MECHANISM
Yes
• Figure 5.0
5.0
5.1
5.2
5.3
5.4
5.5
5.6
5.7
TAB MECHANISM
Tab Adjustments
With
the interposer and cam latched, form the Re-
lease lug to obtain .035" - .045" clearance betwe~n
the Interposer lug and the Releclse lug.
The Keylever Pawl should clear the interposer by
. 020" - .030'11.
The backstop shou Id be adjusted so that the Key-
lever Pawls operate freely with .035" - .045" over-
lap.
The lockout shaft may flip over if the lockout shaft
link is allowed to move left or ,·ight. A clip, PN
1138464, may be installed on the lockout bai I to
prevent lateral movement. (Old style).
The Tab lever should clear a "set" Tab Stop by
.035" - .045" with the Tab lever at rest.
Form the upright lug of the Tab latch for .005" -
.010" clearance between the Escapement Pawl and
the Escapement Rack.
The Tab Lever should overthrow the Tab Latch by
.005" - .010".
Binds - Check the following:
5-9
5.8
Yes
Pawl Clearance 5.5
Binds 5.7
Tab Lever Pawl Loose, Adjult 5.4
Reset Tab Stop
Worn
Pawl (Fig. 3.1)
Rebound 5.8
a. Feed Roll Mounting Arm hits the Tab Over-
throw Stop.
b. Dust Covers - Card Holders.
c. Anvi I and Front Carrier Shoes.
d. Rear Carrier Shoe.
e. Escapement Cord is off of its pu lIey .
f. Pinion Gear.
g . The mai nspri ng tensi on shou Id be 1/2 to 3/4 lbs.
See S . H. 2. 18.
h . Paw I mounti ng stud bi ndi ng on escape torque bar .
S . H. REBOUND
When you are spacing in the area of 12-15 spaces be-
tween set tab stops it is possible for tab rebound to oc-
cur. Most often the carrier wi II rebound 1/2 space
and land on the backspace pawl. No permanent reso-
lution.is avai lable for this problem - Watch your
CEM's.
The following temporary fixes may be used:
1. I ncrease to a maxi mum the tensi on on the R. H .
cord pu
Iley.
2. Break off the backspace pawl if this function is
not
used.
3. Install the spring loaded carrier shoe B/M
1272015. Caution! This bill must not be in-
sta lied if the customer tabs to the extreme R. H.
side of the Printer (5 spaces safety margin should
be left).