Lexmark Jetprinter 4079-00 series, Руководство по обслуживанию

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2-34
4079-00X
2 • Platen
• Linear
Encoder/
Paper Width
Sensor
Check the platen for bits of paper, paper dust, or ink.
Clean the platen with a wet paper towel if necessary.
When the carriage moves to pick up paper, the
paper width sensor detects the black surface of the
platen and the white surface of the paper to deter-
mine the width of the paper. Even a slight scratch
will deflect light. To check a suspected platen, cover
any scratches with small pieces of black electrical
tape, then test the printer. Remove the tape when
the repairs are complete. Check the platen surface.
If the painted surface is damaged, the paper width
sensor cannot detect the platen correctly. Replace
the platen if necessary.
If the platen is all right, replace the linear encoder/
paper width sensor and check the printer operation.
3 • Paperfeed
Rollers
• Linear
Encoder/
Paper Width
Sensor
• Logic Board
Be sure correct paper is being used.
Clean the paperfeed rollers and remove any foreign
objects from the paper path. If the paperfeed rollers
do not turn and the motor does not run go to
the
“Paperfeed Motor Service Check” on page 2-38 .
If the paper is being fed correctly, remove and
replace the following FRUs in sequence. Check
printer operation after each replacement.
1. Linear Encoder/Paper Width Sensor
2. Logic Board.
If you replace the logic board, go to the
“Service
Adjustment Mode” on page 4-4 and perform the print
position adjustment, and the direction offset adjust-
ment.
FRU Action