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4.2.24 Hammer Coil (50, 100,and 1551pm)
Removal
Note:
Leave the print unit closed in coil re-
moval and replacement.
1.
2.
3.
Open the printer covers and remove the
paper guide around the hammer unit
(four screws).
Remove five screws
rJ
and the hammer
retainer plate
13 .
Note:
The hammer springs and plungers
are captive and cannot fly out.
Each hammer block assembly has one
pivot pin. While holding the lower end
of the hammers in toward the comb bar,
use duck bill pliers and slowly work the
hammers out evenly from the top
m
4.
Carefully tilt the tops of the group of
hammers toward you until they rest
against the type belt.
5.
6.
While holding adjacent coils in position,
remove the defective coil
Ii
from the
connector with needle nose pliers.
Check the appearance of adjacent coils.
If adjacent coils appear damaged, replace
the coils.
m
m
Hammer Block, Front View
Replacement
1.
2.
3.
4.
5.
6.
Check the resistance of the new coil for
approximately 4 ohms or compare it
with a known good coil in the printer.
Check that the pins on the new coil are
straight to prevent damage when inserted
in the connector, and install the coil.
Carefully position the hammers back into
the comb bar and coils.
The hammer retainer plate has a small
hole on the left end and an oblong hole
on the right end. I nstall the plate with
the two end screws and tighten sl ightly,
still allowing for plate movement.
Install the remaining three screws and
tighten the screws from left to right to-
ward the oblong hole to eliminate any
bow in the hammer retainer plate.
Press each hammer face of the group
removed with a pencil, spring hook, or
similar object. If a hammer(s), is notice-
ably recessed (offset), the bumper strip
between the hammer and the hammer
stop screw might be out of location. If
so, remove the hammer block (4.2.26) and
tuck the bumper strip in place with a
small screwdriver.
7.
8.
9.
Install the hammer block and plug the
connectors with the labels facing upward.
Install the paper guide with four screws.
Check hammer flight time for character
cutoff (4.2.23, step 4).
Belt Printer
50, 100, and 155 Ipm
4-43
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