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Odd (Lower) Coil Removal
1.
Open the covers and remove the print unit
(4.6.10).
2.
Remove the paper guide around the hammer
unit (four screws).
3.
Determine which block contains the faulty
coil (4.6.26).
4.
Remove the screws
m ,
and the hammer
plate
iii.
5.
Place two strips of electrical tape on the
hammers at
II
and
m.
This aids in
ke~ping the hammers in alignment.
6.
While holding the upper end of the hammers
back toward the guide bar, use pliers, and
carefully move the hammers out from the
coils.
CAUTION
Do not allow dirt or dust to get into the hammer
guide bar or the coils.
7.
Use pliers
II
and carefully pull the faulty
coil out from the front of the hammer block.
8.
Check the appearance of adjacent coils. If
adjacent coils appear damaged, replace the
coils.
HAMMER BLOCK, LOWER, FRONT VIEW
1
@
(@
@)
@)
C®
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.
Check that the pins on the new coil are
straight to prevent damage when inserted
in the connector, and install the coil.
3.
Carefully position the hammers back into
the comb bar and coils. Remove the tape
from the hammers.
4.
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.
5.
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.
@)
T
t
,
II
m
4-122
6.
Press each hammer face of the group
removed with a pencil, spring hook, or
similar object. If a hammer(s) is noticeably
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.
7.
Install the hammer block and plug the
connectors with the labels facing upward.
8.
Install the paper guide with four screws.
9.
Replace the print unit (4.6.10).
10.
Check hammer flight time for character
cutoff (4.6.23, step 4).
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