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4.6.48 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 fi rst.
2. Obtain special gauge IBM PIN 1794549 (of-
fice tool) before doing this adjustment.
Service Check
1.
2.
3.
4.
Open the printer cover and the print unit.
Remove the front paper guide from
around the hammers.
Check the left end of the lower forms
guide by holding the gauge
D
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 step 5 under the adjustment.
Adjustment of Old Style
1.
Be sure nut
m
is tight.
2.
3.
4.
5.
Loosen nut
m ,
then with fi ngers, turn
nut
Pl
a small amount.
Note: Turning nut
a
clockwise moves
the guide toward the front.
Tighten nut
m,
then checR the go and
no-go conditions at both ends.
If the adjustment is changed, do the lower
paper clamp service check (4.6.44).
Replace the front paper guide. Close the
print unit and cover.
I
Hammer
Block
/
• Gauge
09 0
N
L
c)
Go
Hammer
Block
00
No Go
Lower Forms
Guide
Old Style
Adjustment of New Style
1.
2.
Loosen the two allenheacl screws
II .
Using the gauge
II
at each end of the
hammer block, position the lower forms
guide.
3.
4.
5.
4-152
Tighten the two allen head screws
II .
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 (4.6.49).
I f the positioning is correct, replace the
front paper guide. Close the print unit and
the cover.
4.6.49 Lower Paper Guide To Hammer
Clearance
1.
2.
3.
4.
5.
Open the printer cover and remove the print
unit (4.6.10).
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 ot"0.005
inch
±
0.002 inch.
Reinstall all removed parts.
' " New style
lower forms
guide.
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