Table of Contents
Advertisement
4.2.11 Platen Gap
(50, 100, and 155 Ipm)
Service Check
Note:
Special tools are required. Gauge set
81M
1815365 includes:
Platen-to-Casting Gauge
fa
(2)
PIN 1815362
Platen Gap Gauge
iii
(1)
PIN 1814638
1
4-40 Screws (2)
1.
Remove the type belt (4.2.13).
2.
Remove the print unit (4.2.10).
3.
Remove the ribbon shield (4.2.36).
4.
Hold the platen-to-casting gauge
II
near the
right end of the platen as shown. Measure for
a gap
II
between the platen and the gauge.
Repeat for the left end of the platen. If the
gap is not correct, do step 5 only; if the gap
is correct, skip step 5.
Measure Gap
II~
I'
0.001 inch (0.025 mm) Go
0.005 inch (0.127 mm) No-Go
5.
Platen
Do the platen gap adjustments. (Omit the
remaining steps in this service check.)
Replace the ribt50n shield (4.2.36) and the
print unit (4.2.10).
7.
8.
9.
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.
Move the forms thickness control to 6. Hold
the platen gap gauge
iii
1
(hole side down as
shown) against the hammer bar and the right
hammer block assembly.
~
_ _
~~--
Platen
10.
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.
11.
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 (drop point). Repeat several
times until a constant drop point is observed.
12.
Place the gauge on the left side, then repeat
steps 8,9,10, and 11.
13.
The drop points in steps 11 and 12 should
occur when the forms thickness control is
between 2 and 4 with a maximum end-to-
end difference of 1. If the drop point on
either end is outside this range, the platen
gap is wrong.
14.
If the platen gap is not correct, do the
forms path gap adjustment; then do the
platen alignment.
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
4-31
TNL: SN31-0487 to SY31-0373-4 (25 Nov 77)
Advertisement
Table of Contents
