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Figure 7. Hammer Unit
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5. Position the hammer unit horizontally.
a. Loosen the hammer unit mounting screws (2 allen
head screws) .
b. Hold the hammer unit bushing stop (2) .
c. Loosen the bushing stop lock nut (2).
d. Turn the hammer unit bushing stop in the direc-
tion of desired adjustment.
e. Tighten the bushing stop lock nut.
f. Tighten the hammer unit mounting screws.
g. Recheck the hammer unit position.
Hammer Magnet Assembly Removal
1. Prepare to remove hammer magnet.
a. Slide the hammer unit onto the service mount.
( See
Hammer Unit Removal)
b. Remove the cover over the hammer magnets.
c. Remove quick disconnect that goes to the hammer
magnets.
d. Remove the hammer mounting bar assembly.
2. Remove the hammer unit magnet assembly.
a. Remove the magnet lead from quick disconnect
fitting, using special removal tool P/N 461043.
b. Remove the holding screws for the hammer mag-
net assembly.
c. Lift the assembly from the mounting.
3. Replace the hammer magnet assembly.
a. Place the assembly into the mounting.
b. Insert the mounting screws and screw to fit snug.
c. Insert the eccentric adjusting tool and position for
approximately the same air gap between the arma-
ture and the core at the coil end as other assemblies.
d. Tighten the mounting screws.
e. Insert the magnet leads into the quick disconnect
plug.
4. Replace the remaining parts in reverse order.
5. Print and adjust hammer flight time as necessary.
Individual Hammer Magnet Coil Replacement
Only the upper hammer magnet coils may be replaced
without removing the individual hammer magnet assembly
from the hammer casting frame. By "upper" and "lower"
is meant the configuration of the coil of the hammer magnet
assembly, not the location on the hammer casting frame.
To attain access to either upper or lower hammer magnet
assembly and to remove a lower hammer magnet assembly
for coil replacement, refer to
Hammer Magnet Assembly
Removal. The upper hammer magnet assembly is P/N
474061 (qty. 50 or 66) and the lower is P/N 474060 (qty.
50 or 66). The individual coil for both is P/N 474051 (qty.
100 or 132).
1. After determining that the coil is defective, remove
old coil by
prying, cutting
or driving it off the core using
care not to
disturb
or damage the yoke itself.
2. Completely remove old adhesive remaining on core
using ism cleaning fluid, p/rr 450608.
Do not put cleaner on
nylon residual.
3. Coat the four side surfaces of the core with 3M
(EC 232 or 826) cement P/N 261096 using care not to
allow any adhesive to touch top face of core. Do not use
excessive amount.
4. Allow a minimum of two minutes for cement to set.
5. Place on new coil, pressing it to the bottom of the
yoke.
6. Allow 15 to 20 minutes for the adhesive to dry.
( Exposure to moderate heat will lessen drying time.)
Hammer Removal
1. Prepare for removal.
a. Open the T-casting.
b. Open the upper and lower forms guide support
bars.
c. Remove the forms and move the tractors apart to
their extreme limits.
d. Remove the binary paper guides from the tractor
guide bars.
e. Remove the hammer cover.
f. Remove
holding screws for the print impression
control
bar.
g. Slide the print impression control bar with the
hammers and hammer mounting bar attached from
the hammer unit. Do not handle the hammer springs.
h. Place the assembly on a flat surface.
2. Remove the hammer.
a. Remove the dowel screws that hold the impression
control bar to the hammer mounting bar.
b. Carefully slide the print impression control bar
out from inside the hammer assemblies.
c. Lift the hammer mounting bar and remove the
hammer holding
screw.
d. Lift out the hammer by gripping the base. Do not
bend or scratch the springs.
3. Re-install in reverse order. Install the square inner
surface of the hammer to the rear. Keep the rubber of the
print impression control bar to the rear. Do not damage
the hammers when inserting the print impression control
bar. Visually inspect the hammer installed. Spacing be-
tween adjacent hammers should be 0.014" to 0.022".
4. Replace the remaining parts in reverse order.
5. Check the printing. If the spacing between the adja-
cent printed characters is different, it will be necessary to
adjust the hammer magnet armature air
gap.
Ribbon Unit
Ribbon Drive Unit Removal
1. Prepare for removal.
a. Remove the ribbon.
b. Remove the cover over the ribbon and drive.
c. Remove
the wires to the ribbon drive unit.
2. Remove the ribbon drive unit.
a. Loosen
the two
screws
on the right in the upper
ribbon casting mounting gib.
b. Remove the three screws on the left in the gib.
c. Slide the drive unit to the left and raise it to clear
the lower mounting bar.
d. Lower the drive unit to clear the upper gib.
3. Reassemble in reverse order, and position the unit
during reassembly.
Position Ribbon Drive Unit
1. Locate the sense finger.
a. Engage the shift lever in the right stop position.
b. Loosen the screws in the lower support bar.
c. Position the left edge of the sense finger a maxi-
mum of 14 4V4" ±
%i "
from the left upper base of the
T-casting on which is mounted the ribbon spool-
center.
d. Insure that the drive unit is as far to the right
as
possible in its locating slot when doing step
c.
e. Tighten the screws in the lower support bar.
22
REMOVALS AND ADJUSTMENTS
23
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