Page: 38Service Guide ML390/391Chapter 3 Maintenance & Disassembly3.1.03 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 indamaged parts.· Screws, collars and other small parts are easily lost. Temporarily attach these parts to their originalpositions.· 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 BusinessPartner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
