Preface - Canon LBP-1000 Service Manual

I. PREFACE
This chapter describes disassembly and reassembly procedures of the printer.
The service technician is to find the cause of the failure according to the "Chapter 4
Troubleshooting" and to follow the disassembly procedures in this chapter to replace the defec-
tive part(s). Replacement of consumable part(s) is also to be conducted according to the proce-
dures described in this chapter.
Note the following precautions during disassembly or reassembly.
1. At disassembly, reassembly, or transportation of the printer, remove the toner cartridge if
necessary. When the cartridge is out of the printer, put it in a protective bag to prevent light
from affecting it.
2. CAUTION: Before servicing the printer, disconnect its power cord from the electri-
cal outlet.
3. Assembly is the reverse of disassembly unless otherwise specified.
4. Note the lengths, diameters, and locations of screws as you remove them. When reassem-
bling the printer, be sure to use them in their original locations.
5. As a general rule, do not operate the printer with any parts removed.
6. Discharge electrical static from your body by touching the metal frame of the printer prior to
handling the PCBs in order to avoid causing damage by the difference in static charge at that
time.
7. Do not touch the transfer charging roller and the rubber part of the pick-up roller with bare
hands.
8. When placing the printer upside down, if the inside of the printer is dirty, toner and
paper dust may enter the laser/scanner unit and cause image defects. Therefore, in
such a case, make sure to cover the laser emission hole of the laser/scanner unit with
tape.
Also, it is advisable to cover the hole with tape when placing the printer on its side or
back.
9. Use care when disconnecting a flat cable.
Also, when inserting a flat cable into the connector, be sure to connect it vertically, not
obliquely.
CHAPTER 3
3 - 1