Tab Mechanism - IBM Selectric Maintenance Manual

No
D Interlock 5.3
Ves
Tab lever lockout 5.6
Tab lever latch 5.6
Tab Spring Off
Keylever Pawl 5.2 See Output Mode 8.0
TAB MECHANISM
Ves
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 between
the Interposer Lug and the Release Lug.
The Keylever Pawl should clear the interposer by
. 020" - .030".
The backstop should 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 right. 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 shou Id overthrow the Tab Latch by
.005" - .010".
Binds - Check the following:
4-9
5.8
Ves
Pawl Clearance 5.5
Binds 5.7
Tab lever Pawl loose, Adjust 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. Anvil and Front Carrier Shoes.
d. Rear Carrier Shoe.
e. Escapement Cord is off of its pu Iley.
f.
Pinion Gear.
g. The mai nspri ng tensi on shou Id be 1/2 to
314
Lbs.
See S.H. 2.18.
h. Pawl mounting stud binding 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 carri er wi II rebound 1/2 space
and land on the backspace pawl. No permanent reso-
lution is available for this problem - Watch your
CEM's.
The following temporary fixes may be used:
1. Increase to a maximum 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
BIM
1272015. Caution! This bill must not be in-
stalled if the customer tabs to the extreme R. H.
side af the Printer (5 spaces safety margin should
be left).