Table of Contents
Advertisement
4.2.26 Hammer Block Assembly
(50, 100, and 155 Ipm)
Removal
1.
Remove the printer covers (4.2.1) steps 1
through 3 and open the print unit.
2.
Remove the paper guide (four screws).
3.
Remove the two cables
g
from the
hammer block.
4.
Remove the three screws
a
(accessible
from the back of the printer) that hold
the hammer block assembly to the
mounting bar, and remove the hammer
block assembly from the front of the
printer.
Replacement
1.
Replace in the reverse order of removal.
2.
Perform the hammer flight time adjustment
(4.2.23) for any print position displaying
character cutoff.
13(3)
Disassembly
1.
2.
3.
4.
I
_ _ _ I
- - - I
--'
Remove the printer covers.
Remove the hammer block assembly
(4.2.26).
CAUTION
Hold the two halves
m
and
II
of the
hammer block together during removal of
the screws to avoid losing hammer return
springs and plungers
iii .
Remove two screws
D1
holding the two
halves of the hammer block assembly
together.
Note: While disassembling, watch for the
hammer return springs. The springs can
stick to the ha'mmers and falloff.
While holding pressure on the two halves,
lay the assembly, hammer side up, on a
flat surface. Carefully lift and separate
the armature pivot assembly from the
magnet assembly.
Reassembly
1.
2.
3.
4.
5.
6.
7.
Armature
Lay the magnet portion down on a flat
surface with the springs
an~
plunger
facing upward. Check that all springs
and plungers are in place.
Insert armature end of hammers into the
coils to aid in horizontal alignment.
Slowly push the hammers down against
the spring tension.
Check movement of hammers for proper
hammer engagement with plungers.
While holding the assembly together,
turn it over so that the hammer section
faces down. Fasten the two halves to-
gether (two screws).
Check the movement of each hammer to
verify that all hammers, springs, and
plungers were assembled properly.
Loosen each of the two screws
II
one
full turn. Mount the hammer block as-
sembly onto the hammer bar (4.2.26).
Note: Loosening the screws allows for
heat expansion.
m
t-4----[I
r-~------~----~
~f-------Ii
Belt Printer
50, 100, and 155 Ipm
4-45
Advertisement
Table of Contents
