IBM 01 Maintenance Manual page 48

MODEL 01
CUSTOMER ENGINEERING
clear button is pushed down. When in a rest position, the
tab clear lever should clear the set tab stops by
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Maintenance
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Improper forming of the tab lever extension could allow
the rebound check to be slow in restoring as the tab lever
comes to rest. This condition could cause a lock-up of the
carriage during a simultaneous operation of carriage return"
and tab. \
In
some cases, the carriage release universal bar may
rub the tab rebound check lever if the high point of the
rebound check lever eccentric is not kept toward the rear.
At times the tab governor pawl may drag on the friction
plate during carriage return or fail to release after the tab
lever has unlatched. This may be caused by the following(
conditions: (1) The tab operating link is too short and holds
the tab lever out of its true rest position. (2) There is too
much play in the fork of the tab governor control lever.
(3) The rebound check bracket stop is formed too far to the
rear and holds the tab lever to the rear. (4) The governor
pawl link is out of adjustment. (5) The tab latch is not
adjusted far enough to the rear to give full motion of the
tab lever.
TAB REBOUNDING.
This condition occurs when the tab
lever comes to rest less than two spaces past the set tab
stop. The following factors may cause rebounding:
1. Too little clearance between the tab lever and the
tab latch when the tab lever is pulled to the left
2. Excessive rebound check lever clearance
3. The support plate formed too low, causing the rebound
check lever to operate below the set tab stop
4. Leaf spring broken or malformed (
5. Tab governor pawl not holding in the friction governor
plate
6. Insufficient friction governor pressure
7. Too little clearance between tab lever and a set tab
stop
8. Tab stops not parallel to the tip of the tab lever
TAB SKIPPING.
This is a condition in which the tab lever (
comes to rest more than two spaces past the set tab stop. The
following factors may cause skipping:
1. Too little clearance between the tab lever and the tab
latch when the tab lever is held to the left
2. Excessive pawl clearance
3. Tab governor pawl not holding in the friction governor
plate
4. Too much clearance between the tip of the tab lever
and a set tab stop
5. Insufficient bite of the tab lever on a set tab stop
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