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4.4.2
FUSE REPLACEMENT
Fuse
F1
is
located on the forward right-hand corner of the logic
pcb adjacent to
the power transformer and
POWER ON/OFF switch.
Refer to
Figure
4-1
and proceed as follows:
1.
Remove covers to gain access
to
logic pcb mounted on the base
cover.
(See
Paragraph
4.4.1.)
2.
Loosen
screw, located on right side of transformer
using
a
Phillips
screwdriver.
3.
Remove the clear plastic high voltage shield covering the fuse and
AC input circuits.
4.
Remove and replace the defective fuse.
5.
Reinstall the high voltage shield.
Make sure that
the slotted
portion of
the shield is under the flat washer.
6.
Tighten
the
Phillips-head screw to secure
the
shield and trans-
former
.
7.
Replace the covers.
4.5
DETAILED TROUBLESHOOTING
Table 4-3 lists some malfunctions which may occur, the probable
causes, and the remedies which may be performed by qualified service personnel.
The procedures referenced
in the
detailed troubleshooting chart should only
be
performed by qualified service personnel who have been trained to maintain and
repair complex electronic and electromechanical equipment.
Table
4-3.
Detailed Troubleshooting Chart
TROUBLE
PROBABLE CAUSE
REMEDY
Head drags
(wide
smudge on paper)
Head gap improperly ad-
justed.
Defective head-carriage
assembly.
Adjust printer head
gap.
(See
paragraph
5.3.)
Replace defective head-
carriage assembly.
(See
paragraph
6.8.)
Light smudge under
print
line.
Head gap improperly ad-
justed.
Defective head-carriage
assembly.
Adjust printer head
gap.
(See
paragraph
5.3.)
Replace head-carriage
assembly.
(See
para-
graph
6.8.)
4-6
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