Specifications

REV.-A
Tahln -K Rannir nf tha Printar Maehanism (Continued}
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Problem
Symptom Cause
Checkpoint
Solution
Self-test printing
A particular dot
The printhead is
Measure the coil
Replace the
is abnormal.
fails to print.
defective.
resistance of the
printhead.
printhead. The
normal value is
approximately 45.5
ohms.
Check whether the
Replace the
dot wire is worn.
printhead.
The printing is too
The printhead is
Check whether the tip
Replace the .
light, or the print
defective.
of the dot wire is
printhead.
density is not
worn.
uniform.
The platen gap is
Set the gap adjust
Adjust the gap.
not properly
lever to the second
Refer to Section
adjusted.
position, and check
4.1.2, Platen Gap
the gap between the
A@stment.
tip of the printhead
and the platen.
The appropriate
value is 0.48 mm.
Paper feeding is
Printing is Foreign substances
Petform a visual
Remove any
abnormal.
petiormed, but the
are lodged in the
check of the paper
foreign
paper is not fed, or
paper path.
path.
substances.
is not fed uniformly.
The paper-feed
Check that no foreign ● Remove any
motor is not driving substance is lodged
foreign substance.
the gear correctty.
between the gears,
● Repface the
and that the gears
paper-feed
are not broken or
reduction gear.
worn.
● Replace the
platen gear.
The paper-feed
Measure the
mil
Replace the
motor is defective. resistance for the
paper-feed motor.
paper feed motor.
The approximate
value should be
79
ohms.
5-18