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129
A-FRAME
A-frame alignment to the platen is set at the factory
and mounting screws are sealed with Loctite'.
Alignment should not be needed in normal printer use.
However, if alignment is needed, use the following
procedure:
Service Check
1.
Set the Copy Control dial to
o.
2.
3.
Run PRT04 (191) and check for uniform printing
and density at both ends of the line.
Adjust if needed.
Alignment
1.
Power off.
2.
Remove the printer cover (110).
3.
Set the Copy Control dial to
o.
4.
5.
Measure the gap between the platen and the print
head at both ends of the platen. Gap should be
0.30 mm to 0.36 mm (0.012 inch to 0.014 inch). If
the left end dimension is not correct, go to the
next step; if the right end dimension is not correct,
go to step "9.
If the left end dimension is not correct, slightly
loosen the 2 A-frame mounting screws in the left
side frame
e.
'Trademark of the Loctite Corp"
129
Remove, Replace,
Adjust
6.
With a brass punch and a hammer, tap on the
. A-frame left side plate to obtain the specified gap.
7.
Tightly fasten the A-frame mounting screws
(Loctite is not needed), check the gap, and adjust
again if needed.
8.
9.
Check the gap at the right end of the platen. If
the gap is not correct, continue on to the next
step. If the gap is correct, install the printer cover
(110), power on, and set the Copy Control dial for
correct printing.
If the right end dimension is not correct, slightly
loosen the 2 A-frame mounting screws in the right
side frame
O.
10.
With a brass punch and a hammer, tap on the
A-frame right side plate to obtain the specified
gap.
11.
Tightly fasten the A-frame mounting screws
(Loctite is not needed), check the gap, and adjust
again if needed.
12.
Check the gap at the left end of the platen. If the
gap is not correct, return to step 5. If the gap is
correct, install the printer cover (110)' power on,
and set the Copy Control dial for correct printing.
13.
Check platen gear backlash (play) (124) and adjust,
if needed.
14.
Check the End-of-Forms switch adjustment and
correct it if needed.
Maintenance
5256 MIM
1-29
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