Table of Contents
Advertisement
4.2.11 50, 100, and 155 Ipm Platen Gap
{Continued}
Adjustments (continued)
Platen Alignment
Note:
Use platten gap gauge PIN 1814638 mi.
1.
Loosen the platen:
2.
3.
4.
a. The platen mounting screws
iii
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 two end
mounting screws
m .
Close the print unit and set the forms thick-
ness control on 3.
Place the gauge
iii
I
against the hammer bar
and the left hammer block assembly. The
hole side of the gauge should be on the
upper edge of the rear forms guide. If
needed, move the platen toward you until
the gauge drops into position. Move the
platen against the gauge and tighten the
left mounting screw slightly.
Move the forms thickness control to 6 and
remove the gauge. Place the gauge m (hole
side down as shown) against the hammer bar
and the hammer block on the right. If needed,
move the platen toward you until the gauge
drops into position. Move the control to 3.
Carefully push the right end of the platen
against the gauge and tighten the right mount-
ing screw slightly.
5.
6.
7.
8.
9.
Move the forms thickness control to 6 and
remove the gauge. Place the gauge on the
left side (same as step 3) and move the
control to 3. Loosen the left mounting
screw. Carefully push the left end of the
platen against the gauge and tighten the
left mounting screw slightly.
Lift the gauge (still on the left side)
approximately 0.060 inch (1.52 mm) off
the upper edge of the rear forms guide
and move the forms thickness control
to 1. Ensure that the gauge is against the
side of the bammer block assembly. Care-
fully, 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 point is observed. The gauge
should drop when the forms thickness
control is between 2-1/2 and 3-1/2.
Remove the gauge and repeat step 6 with
the gauge on the right side.
Gradually' tighten the screws slightly
until all screws are tight.
Verify the drop points again. The drop
points in steps 6 and 7 should occur when
the forms thickness control is between
2-1/2 and 3-1/2, with a maximum end-to-
end difference of 1/2. If the drop point
on either end is outside this range, repeat
steps 2 through 6. Do not adjust with
the support arm eccentric.
Hammer
Block
Assembly
Gaugem
(right side)
Platen
Note:
If the difference from end-to-end is more
than 1/2 division on the forms thickness scale,
loosen the center platen mounting screw and
the screw on the end needing adjustment. Adjust
the platen for the correct drop points and tighten
the screws. (See steps 6, 7, 8, and 9.)
10.
If necessary, install a new print position
scale
CI
on the platen as shown. Align
the print positions with the matching
hammer positions.
11.
Replace the paper guide (four screws),
ribbon, type belt, and covers.
4.2.12 Platen {50, 100, and 155 Ipm}
Removal
1.
Turn the power off.
2.
3.
Open the printer covers.
Remove the type belt (4.2.13) and remove the
ribbon from the ribbon guide.
4.
Open the print unit.
5.
6.
The platen mounting screws
m
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.
Remove the sealant (if present) from the
screw heads, then remove the screws
m
and
the platen.
If necessary, remove the ribbon shield from
the platen (4.2.36).
Replacement
11.
2.
3.
Replace ribbon shield if it was removed.
Install the platen with the mounting screws
and washers. Tighten the screws slightly
(so that the platen can be moved easily).
Adjust the platen by doing all of the
Platen Gap Adjustments
(4.2.11).
ITo ensure accurate adjustment, the printer must be in its normal operating position whenever this gauge is used.
Belt Printer
50, 100, and 155 Ipm
4-33
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
Advertisement
Table of Contents
