HP LaserJet 4L - Removal and Replacement Strategy

Removal and Replacement
Removal and Replacement Strategy
Removal and Replacement Strategy
This chapter documents removal and replacement of Field
Replaceable Units (FRUS) only. Exchange assemblies should be
sent to SMO for repair.
Unless specifically stated otherwise, these procedures apply to all
four printer models (LaserJet 4J-J4ML/4P/4MP). Replacement is
generally the reverse of removal. Occasionally, notes are included
to provide direction for diffkult or critical replacement procedures.
WARNING!
CAUTION
Note
Unplug the power cord from the power outlet
before attempting to service the printer. If this
warning is not followed, severe injury may result.
Never operate or service the printer with the
protective cover removed from the
Laser/Scanner Assembly. The reflected beam,
although invisible, can damage your eyes.
The printer contains parts that are electrostatic
discharge (ESD) sensitive. Always service
printers at an ESD protected workstation.
To install a self-tapping screw, first turn it
counter-clockwise to align it with the existing
thread pattern, then carefully turn clockwise to
tighten. Do not over-tighten. If a self-tapping
screw-hole becomes stripped, repair of the
screw-hole or replacement of the affected
assembly is required.
Always remove the toner cartridge and the
paper cassette from the printer before removing
or replacing printer parts.
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