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4.6.26 Hammer Block Assembly (285 Ipm)
Removal
Note:
The hammer blocks are designed so that
the hammers are interlocked with each other.
Therefore, a block cannot be removed until other
specific blocks have been loosened or removed.
For example, to remove block 3, you must first
loosen block 2 and remove block 4. See chart:
1.
2.
3.
4.
5.
6.
Remove the covers and the print unit
(4.6.10).
Remove the paper guide (four screws).
Open the card gate, and latch it in the open
position.
From the rear of the machine, remove three
screws
Ii!
from each hammer block(s) that
must be loosened or removed.
Remove the upper hammer block, as needed,
from the front. Disconnect two plugs
m .
Note:
Mark the location of each block you
remove so that they will not be exchanged.
If needed, remove the lower hammer block
from the front. Disconnect two plugs
II.
Replacement
CAUTION
Be careful not to pinch wire
m
when replacing
blocks.
1.
If removed, replace the lower hammer block
first.
a. Connect the lower plugs to the lower
hammer block, then install the block.
b. Do not tighten screws.
2.
Replace the upper block.
a. Connect the upper plugs to the up.per
block, then install the block.
b. Tighten the screws in all blocks that were
loosened or removed.
3.
Close the card gate.
4.
Replace the paper guide.
5.
Replace the print unit (4.6.10) and the
covers.
4-124
Reassembly
1.
2.
Lay the magnet portion down on a flat
surface with the springs and plunger
facing upward. Check that all springs
and plungers are in pl,ace.
Insert armature end of hammers into the
coils to aid in horizontal alignment.
3.
Slowly push the hammers down against
the spring tension.
Disassembly
4.
Check movement of hammers for proper
hammer engagement with plungers.
1.
2.
3.
4.
Remove the printer covers.
Remove the hammer block assembly
(4.6.26).
CAUTION
Hold the two halves
II
and
II
of the
hammer block together during removal of
the screws to avoid losing hammer return
springs and plungers
m .
Remove two screws
m
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 hammers and fall off.
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.
5.
While holding the assembly together,
turn it over so that the hammer section
faces down. Fasten the two halves to-
gether (two screws).
6.
Check the movement of each hammer to
verify that all hammers, springs, and
plungers were assembled properly.
7.
Loosen each of the two screws
m
one
full turn. Mount the hammer block as-
sembly onto the hammer bar (4.6.26).
Note:
Loosening the screws allows for
heat expansion.
Armature
II
~--II
r-~----~~----~
!-=+-oIIf-----m
Hammers 2-44
Hammers 46-88
Hammers 90-132
Block 2
Block 4
Block 6
Driver Card A 13C
Driver Card A 13E
Driver Card A 13G
Loosen block 1
Loosen block 3
Loosen block 5
tm:)~
~Jm~
Hammers 45-87
Hammers 89 131
I'"
Hammers 1-43
Block 3
Block 5
Block 1
Driver Card B 13E
Driver Card B 13G
Driver Card B 13C
Remove block 4
Remove block 6
Remove block 2
Loosen block 2
Loosen block 4
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