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4~2.11
50, 100, and 155 Ipm Platen Gap
(Continued)
Adjustments
To establish the correct plate.n gap, the following
adjustments must be performed in sequence:
a.
Platen to Casting:
Locates the pi aten on the
print unit casting using two gauges.
b.
Forms Path Gap:
Locates the print unit
casting to the hammer bar by adjusting
the eccentric in the support arm.
c.
Platen Alignment:
Aligns the platen so that
it is parallel to the hammer bar.
PI aten-to-Casti ng
Note:
Use platen-to-casting gauges PIN 1815362
m
1.
Remove the print unit (4.2.10).
2.
3.
4.
Remove the ribbon shield (4.2.36).
Install special gauges
m
as shown:
a. Ensure that the mounting surface is clean
and flat.
b. Install the gauges, using the two s.crews
supplied in BIM 1815365.
Measure at both ends for a gap between the
platen and the gauge as shown
m.
If both
gaps are correct, go to step 5; otherwise, do
steps a through f.
a. The platen mounting screws
II
are located
under the print position scale
m.
To
expose the screws, cut away the parts
of the scale that cover the platen screw
recesses.
b. Remove the sealant (if present) from the
screw heads, then loosen the platen
mounting screws.
0.002 inch (0.50 mm) Go
Measure
Gapm~
0.004. inch '(0.101 mm) NO-GO.,
(both ends)
5.
6.
7.
c. Place a 0.004 inch (0.10 mm) gauge be-
tween the platen and the right gauge,
then push the platen against the gauges.
Tighten the right screw slightly.
d. Repeat step c for the left side.
e. Measure gap
m
at both ends. Adjust
again if necessary.
f. Gradually tighten all mounting screws,
then measure gap
m
again. Adjust
again if necessary.
Remove the gauges
m '
then replace the
ribbon shield (4.2.36).
Replace the print unit (4.2.10).
Do the forms path gap adjustment next.
Forms Path Gap
Note:
Use platen gap gauge part number 1814638
iii·
1.
Remove the paper guide (four screws) from
around the hammers, if not done before.
2.
3.
4.
Close the print unit. Push down on the
center of the print unit to remove any play
in the support mechanism.
Move the forms thickness control to 6. Hold
the gaugelil
1
(hole side down as shown)
against the hammer bar and the right hammer
block assembly.
Lift the gauge about 0.060 inch (1.52 mm)
from the edge of the forms guide and set
the forms thickness control on 1. to clamp
the gauge.
5.
6.
7.
4-32
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
Carefully, and with no downward pressure,
move the forms thickness control toward 6.
Observe the position on the forms thickness
scale when the gauge drops (drop point).
Repeat several times until a constant drop
point is observed.
Place the gauge on the left side, then repeat
steps 2, 3, 4, and 5.
Determine the average of the right and left
drop points.
For example:
Right drop point
Left drop point
Average
3-1/2
5-1/2
4-1/2
a. Adjust the eccentric
II,
then repeat
steps 3 through 7 until the average of
the right and left drop points is 3
±
1/2.
Note:
When adjusting, ensure that the high
side of the eccentric is toward the front
(operator side)
I.
b. If the difference between the right and
left drop points is
112
or less, the platen
gap is correct; replace the paper guide,
type belt, and ribbon.
c. If the difference between the right and
left drop point is more than 1/2, do the
platen alignment.
Fro4jJ
Hammer
Mounting Bar
~-f-- Gauge
iii
1
(right side)
~-~--
Platen
ITo ensure accurate adjustment, the printer
must
be in its normal operating position whenever this gauge is used.
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