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Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.1.03 Maintenance Precautions
· Do NOT disassemble the unit if it is operating normally.
· Before starting disassembly and assembly, always power OFF the unit and detach the power cord.
· Detach the interface cable, if installed.
· Do not remove parts unnecessarily. Try to keep disassembly to a minimum.
· Use the recommended maintenance tools.
· When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in
damaged parts.
· Screws, collars and other small parts are easily lost. Temporarily attach these parts to their original
positions.
· When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM)
can be destroyed by static electricity.
· Do not place printed circuit boards directly on conductive surfaces.
· Follow the recommended procedures when replacing assemblies and units.
· Perform the Printhead Gap Adjustment
(Refer to Section 3.3
)
when the following occur.
Print quality is darker on either side of the document.
The following parts are replaced.
Space Motor Assembly
(Refer to Section 3.2.15
)
Carriage Shaft
(Refer to Section 3.2.16
)
Guide Rail
(Refer to Section 3.2.18
)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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