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3351 Print Head
CAUTION
The print head may be hot after continued use. Always
let this print head cool before removing it.
Service check
1.
Switch off the printer power.
2.
Set the copy-control dial to O.
3.
Remove the ribbon cartridge (3405).
4.
Remove .the print head forms guide (3352).
5.
Remove the ribbon shield (3355).
6.
Check for a gap of 0.25 to 0.30 mm (0.010 to
0.012 in.) between the print head and the platen
e·
7.
If
the gap is not correct, perform the following
adjustments:
Adjustment
1.
Perform steps 1 to 8 of the removal procedure.
2.
Reinstall the platen (3101) and turn it until the
3.
right-hand platen knob setscrews are at the top.
Adjust the print head to platen gap, as follows:
(With the print head in the center of the platen.)
a.
b.
c.
d.
Loosen the copy-control dial mounting screw
O.
The print head moves toward the platen.
Set the copy-control dial to
o.
Place a 0.25 mm (0.010 in.) gauge between
the platen and the print head wires • .
Tighten the copy-control dial mounting screw
O·
e.
Check the adjustment and adjust again, if
necessary.
4.
Remove the platen (3101).
5.
Reinstall and adjust the ribbon shield (3355).
6.\
Reinstall print head cover.
7.
Reinstall the print head forms guide (3352).
8.
Reinstall the ribbon cartridge (3405).
9.
Reinstall the access cover (3051).
head
Platen
0.25
to
0.30
0.010
to
0.012
Maintenance Procedures·· 3-55
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