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4.6.24 Hammer Coil (285 Ipm)
Even (Upper) Coil Removal
Note:
Leave the print unit closed in coil removal
and replacement.
1.
Open the printer covers and remove the
paper guide around the hammer unit (four
screws) .
2.
Close the print unit.
3.
4.
5.
Determine which block contains the faulty
coil (4.6.26).
Remove seven screws
m
and the hammer
retainer plate
m .
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
iii .
CAUTION
Do not allow dirt or dust to get into the hammer
guide or the coils.
6.
Carefully tilt the tops of the group of
hammers toward you until they rest
against the type belt.
7.
While holding adjacent coils in position,
remove the defective coil
II
from the
connector with needle nose pliers.
HAMMER BLOCK,UPPER, FRONT VIEW
8.
Check the appearance of adjacent coils.
If adjacent coils appear damaged, replace
the coils.
Replacement
1.
Check the resistance of the new coil for
approximately 4 ohms or compare it
with a known good coil in the printer.
2.
3.
4.
5.
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. Install the plate with
the two end screws and tighten slightly,
still allowing for plate movement.
Install the remaining screws and tighten
the screws from left to right toward the
oblong hole to eliminate any bow in the
hammer retainer plate.
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6.
7.
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 (4.6.26) and
tuck the bumper strip in place with a
small screwdriver.
Install the hammer block and plug the
connectors with the labels facing upward.
8.
Install the paper guide with four screws.
9.
Check hammer flight time for character
cutoff (4.6.23, step 4).
tJ
Belt Printer
2851pm
4-121
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