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4.2.25 Hammer (50, 100, and 155 Ipm)
Note:
Interchanging hammers might change
flight time. Keep hammers in original positions.
Removal
1.
Remove the hammer block assembly
(4.2.26).
2.
3.
Remove five screws
B
and the hammer
retainer plate
EJ.
Note:
The hammer springs and plungers
are captive and cannot fly out.
Each hammer block assembly has one
pivot pin. With the hammers facing up-
ward, use a pointed object such as the tip
of a pencil to start the pivot pin out of
the hammer block assembly. Pull the
pivot pin
m
just past the defective
hammer and remove the hammer
[i .
Replacement
1.
Install the new hammer and slide the
pivot pin back into location. (Check
that the bumper strips between the back
of the hammers and the hammer adjusting
screws are still in their proper location.)
2.
The hammer retainer plate has a small
hole on the left end and an oblong hole
on the right end. Install the plate with
the two end screws and tighten slightly,
still allowing for plate movement.
3.
Install the remaining three screws and
tighten the screws from left to right to-
ward the oblong hole to eliminate any bow
in the retainer plate.
4.
Install the hammer block assembly and
plug the connectors with the label facing
upward.
5.
Install the paper guide with four screws.
6.
Check hammer flight time (4.2.23).
4-44
Hammer Block, Front View
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