40838301TH Rev.1 4 - 1This chapter explains the procedures for replacement of assemblies and units in the field.4. General4.1 Precautions for Parts Replacement(1) Before starting disassembly and reassembly, always turn the AC power switch OFF, and pullout the AC plug.Note: Unplug the AC power cord from the wall outlet first and then from the facsimile.(2) Do not try to disassemble as long as the facsimile is operating normally.(3) Do not remove unnecessary parts: Try to keep disassembly to a minimum.(4) When disassembling, follow the prescribed sequence. Otherwise, parts may be damaged.(5) Since screws and small parts are likely to be lost, they should temporarily be attached to theiroriginal positions.(6) When handling items such as printed circuit boards, do not wear gloves that are likely togenerate static electricity.(7) Using a wrist band connected to the ground will protect semiconductors on printed circuit boardsfrom damage by the static electricity.(8) Do not place printed circuit boards directly on the equipment or on the floor.Board or Part Adjustment(a) NCU board DIP switches to be placed in the same position as on the removed board.Refer to Chapter 8.Note: The DIP switches setting is subject to change by PTT parameters.WN5, DN5 and FN5 board (Except for USA/Canada version)(b) LED print head When the rank marking of the replaced LED print head (new part) is thesame as that of the used LED print head (old part), you do not alwayshave to set the LED print head strobe time by the technical function No.27. (Refer to Chapter 5)
