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6.8
HEAD-CARRIAGE ASSEMBLY
(See
Figure
6-6)
Replacement of
the
head-carriage assembly requires removal of
the
assemblies
as
follows:
a.
See power removal WARNING (paragraph 6.1).
Remove the cover
assemblies per paragraph 4.4.1.
b.
Remove the mechanism assembly per paragraph
6.2.
CAUTION
When removing
the
carriage shafts, take
care not to score the shafts, as this
could result
in
rough carriage move-
ment
or
excessive wear of
the carriage.
Also, the
carriage must be supported
and
handled carefully during removal
and
replacement.
c.
Remove the two outside retaining rings from the carriage
shafts
at the
right side plate.
Then, remove the four inside retaining
rings from the carriage shafts.
d.
Remove the rack tension leaf spring from the left side
plate
using
a
1/4-inch nutdriver.
e.
Carefully press
the right
ends of the carriage shafts through the
side plate, and
move them out through
the left side plate.
f.
Remove the molded rack from the mechanism assembly and set
the
defective head-carriage assembly aside.
g.
Align
the
replacement head-carriage assembly and insert
the
nylon
rack through the carriage bushings, then index the
ends of the
rack into the slots
in
the side plates.
See
CAUTION
below.
CAUTION
The rack
is
not symmetrical, and must be
installed so that
the end
with
the
molded
stud
is
at the left side plate.
The
additional rack teeth are required
for the
RTP function.
h.
Install the carriage shafts and rack tensioner leaf spring,
referring to steps
e., d., and
c.
as
required.
See NOTE below.
NOTE
Before installing the mechanism assembly
on the base,
perform
the
clearance check/
adjustment on
the
head-carriage assembly
for
the
printhead to platen gap and
the
Hall effect sensor (Column Sense) and ro-
tating magnet
gap.
l.
Install the mechanism assembly and cover assemblies,
referring to
steps
b.
and
a.
as required.
6-9
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