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4.6.11 Platen Gap (285 Ipm)
Service Check
Note: Special tools are required. Gauge set 81M
1815365 includes:
1.
2.
3.
4.
5.
Platen-to-Casting Gauge
It
(2) PIN 1815362
Platen Gap Gauge
iii
(1) PIN 1814638 *
Remove the type belt (4.6.13).
Remove the print unit (4.6.10).
Remove the lower ribbon shield (4.6.36).
Open the upper ribbon shield.
Hold the platen-to-casting gauge
Ill,
as
shown, near the right end of the platen.
Measure for a gap
II
between the platen and
the gauge. Repeat this check at the left end
of the platen. If the gaps at the right and left
ends are not correct, do step 6 only; if the
gaps are correct, skip step 6.
Measure gap
II
~
I
0.007 inch (0.17 mm) Go
0.011 inch (0.28 mm) No-Go
Platen
6.
Do the platen gap adjustments. (Omit the
remaining steps in this service check.)
*The printer
must
be in its normal operating
position whenever this gauge is used.
7.
8.
9.
Replace the lower ribbon shield and the
print unit.
Remove the paper guide from around the
hammers (four screws).
Close the print unit. Push down on the
center of the print unit to remove any play
in the support mechanism.
10.
Move the forms thickness control to 6. Hold
the platen gap gauge
iii
* (hole side up as
shown) against the hammer bar and the right
hammer block assembly.
~-..L---m
Gauge*
~
_ _
~~--
Platen
11.
Lift the gauge about 0.060 inch (1.52 mm)
above the bottom lip of the platen
II,
and
set the forms thickness control on 1 to
clamp the gauge.
12.
Slowly, and with no downward pressure,
move the forms thickness control toward 6.
Observe the position on the forms thickness
scale when the gauge drops to the bottom
lip (drop point). Repeat several times until
a constant drop point is observed.
13.
Remove screw
m
from the left end of the
hammer block mounting bar, and slide the
hammer position scale
II
to the right.
14.
Place the gauge on the left side, then repeat
steps 9, 10, 11, and 12.
Note: Since the left end of the hammer
block assembly does not provide a flat
surface for gauge alignment, hold the gauge
slightly to the left of the hammer block
assembly when you repeat step 10.
15.
The drop points for the right and left sides
should occur when the forms thickness control
is between 1-1/2 and 3-1/2, with a maximum
ent-to-end difference of 1. If the drop point
on either end is outside this range, the platen
gap is wrong.
16.
If the platen gap is not correct, do the forms
path gap adjustment; then do the platen
alignment (skip platen-to-casting and forms
path gap adjustments). If the gap is correct,
do steps 17 and 18.
17.
Slide the hammer position scale
11
to the
left and install screw
m .
18.
Replace the paper guide (4 screws), the
typebelt, the ribbon, and the covers.
Belt Printer
285 Ipm
4-109
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