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4.2.48 Lower Forms Guide To
Hammer Bar Adjustment
Notes:
1. This guide does not normally need adjusting.
Be sure other related adjustments, such as
platen gap, lower paper clamp, and forms
tension springs are checked first.
2. Obtain special gauge IBM PIN 1794549 (of-
fice tool) before doing this adjustment.
Service Check
1.
Open the printer cover and the print unit.
2.
Remove the front paper guide from
around the hammers.
3.
4.
Check the left end of the lower forms
guide by holding the gauge
I]
against the
left hammer block and the hammer
mounting bar as shown, then check for
the go and no-go conditions.
Move the gauge to the right end of the
hammer block and check the right end of
the lower forms guide.
Note: If the go and no-go conditions are
correct at both ends of the hammers, the
lower forms guide is adjusted correctly.
If correct, go to ste.p 5 under the adjustment.
Adjustment of Old Style
1.
Be sure nut
R
is tight.
2.
Loosen nut
m ,
then with fingers, turn
nut
rl
a small amount.
3.
4.
5.
Note: Turning nut
a
clockwise moves
the guide toward the front.
Tighten nut
m,
then check the go and
no-go conditions at both ends.
If the adjustment is changed, do the lower
paper clamp service check (4.2.44).
Replace the front paper guide. Close the
print unit and cover.
Hammer
Block
/
• Gauge
a£) oN
00
Go
00
No Go
Adjustment of New Style
Lower Forms
Guide
Old Style
1.
Loosen the two allenhead screws
II .
2.
Using the gauge
1m
at each end of the
hammer block, position the lower forms
guide.
4-72
3.
Tighten the two allen head screws
Ii .
4.
Check again with the gauge
II .
CAUTION
If the four screws
II
are loosened, it is
necessary to adjust the lower paper guide
to hammer clearance (4.2.49).
5.
If the positioning is correct, replace the
front paper guide. Close the print unit and
the cover.
4.2.49 Lower Paper Guide To Hammer
Clearance
1.
2.
3.
4.
5.
Open the printer cover and remove the print
unit (4.2.10).
Measure the clearance between the lower
paper guide and the lowest hammer. The
clearance should be 0.005 inch ± 0.002 inch.
If adjustment is necessary, remove the front
paper guide.
Loosen the four screws
II '
and position the
lower paper guide for a clearance of 0.005
inch ± 0.002 inch.
Reinstall all removed parts.
"
New style
lower forms
guide.
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