Inspection Procedure; First Inspection Period - IBM Selectric Reference Manual

INSPECTION PROCEDURE
Inspection
Period Inspection Area
2
3
Impression and Alignment
Tilt Mechanism
Rotate Mechanism
Detenting
Keyboard Area
Selection Magnet Units
Operational Magnet Units
Pusher Unit
Cycle Clutch Unlatching
Cycle Clutch
Contacts
Contact Cleaning
Ribbon Feed Mechanism
Escapement
Motor Drive and Carrier Return
Indexing and Paper Feed
Shift (Enter Mechanism)
FIRST INSPECTION PERIOD
IMPRESSION AND ALIGNMENT
1. The rotate and tilt tapes must be free from kinks and nicks.
2. Check for binds or excessive play in the, tilt and rotate de-
tents with respect to their guides. Check the tilt ring in
relation to its pivots, and the upper ball socket with re-
spect to the tilt-ring spacer.
3. Check for smooth compensator action.
Static check:
a. Hal f-cycle a -5 selection with the type head removed.
b. Pull the rotate arm out until it is completely removed
from the compensator leaf spri ng.
c. Release the rotate arm. This should cause the leaf
spring to collapse against the power frame.
DYNAMIC CHEC K
1. a. Move the roller to the top of the compensator.
Repetitively type minus-five selections. The roller
should return to the compensated position. I f wear
2.
b.
has caused the compensator roller to drop almost to
the bottom of the slot, ha I f-cycle a -5 character.
Tilt the machine up on its back. Raise the nylon
wedge manually, and tighten the rotate link until
there is 1/16" travel left in the nylon wedge. Tight-
en the nuts on the rotate link. NOTE: The com-
pensator nylon wedge must be clean and free of oi I.
If it does not drop easily, or appears to be oily or
dirty, flush the wedge with cleaning fluid and wipe
dry.
The general condition of all selection and output-motion
adjustments can be checked by making a complete strike-
up of the keyboard. Type back over it several times, watch-
ing for signs of misalignment with the pr<aviously typed char-
acters. If alignment is not satisfactory, the need for closer
inspection can be met by observing the dynamic detenting
action of the typehead.
1-11
TILT MECHANISM
1. Check the tilt motion: Use TO and T3.
2. Check the tilt detenting: Use a T3 character and half-
cycle the machine. Place a slight pressure on the rear
of the tilt ring. Remove the detent, and allow it to re-
turn slowly. The ring should move no more than. 005".
ROTATE MECHANISM
1. Half-cycle a O-rotate, 3-tilt character and observe the
detenting. Follow the same procedure for a +5 rotate
3-ti It character, a -3 rotate, 3-:ti It character, and a '-5
rotate, 3-tilt character.
The variance in bandwidth of these characters should not
exceed .030".
NOTE: Check as follows: Half-cycle the character and re-
move detent from the head . Take the play out of the
head in a clockwise direction. Allow the detent to
return slowly, and observe the point the detent strikes
or enters the skirt. Bandwidth equals the difference
between the best and worst character.
DETENTING
1. Print-shaft timing: The detent must enter and leave the
head without hitting the skirt. Check by manually half-
cycling. Use a -5, home, and a +5 character.
2. The skirt clearance should be .025" - .035" in a 2-tilt
position. When both detents are engaged fully in their
respective notches, there should be .001" minimum mo-
tion of the detent-cam follower with respect to the detent
lever.
KEYBOARD AREA
1. All key levers operate freely. No binds.
2. All. key levers have enough travel to fully latch an inter--
poser and restore positively.
3. With any interposer latched down, the cycle-clutch-re-
lease pawl should clear its keeper by .002" - .008" (un--
latching adjustment).
4. The cycle-clutch-Iatch-pawl bite on the keeper must be
one-half the thickness of the keeper. Adjust the bail up-
stop.
5. The cycle-clutch-latch pawl overthrows the keeper by
.020" - .025" (under manual operation) when restoring.
6. Operational key levers should allow for positive single
operation.
Latch Selection. The latch I inks should. allow the latches to
overhang the bail flush to .010" overlap.
Manually hal f-cycle the following selections one at a
time, and observe the latches:
O-rotate, 1 -ti I t character
-5 rotate, l-tilt character
+ 1 rotate, O-tilt character
+ 2 rotate, O-ti I t character
+ 3 rotate, O-ti It character
These characters allow each latch to be checked individual-
ly. Observe that the selected latches clear the bail fully,
and do not snap off. Observe that the nonselected, oroper-
ated, latch seats fully on the bail, does not jump off, and
makes the correct selection.