Laser/Scanner Section - Canon LASER CLASS 730i Service Manual

4.1 Laser/Scanner Section

This section comprises a Laser unit, cylindrical lens, 6-faced polygon mirror, scanner motor,
imaging lens, reflection mirror and BD unit. The Laser is driven in accordance with the Laser
drive signals that are sent from the SCNT board. This Laser light passes through the cylindrical
lens to fall on the 6-faced polygon mirror that is rotating at a fixed speed. The Laser light is
reflected from the 6-faced polygon mirror and passes through the imaging lens, and reflects
from the reflection mirror to scan the photosensitive drum in the toner cartridge.
The Laser/scanner unit offers newly developed functions. For details, see "4. NEW
FUNCTION" in this chapter.
BD Malfunction
When the input cycle of the /BDI signal falls out of the range of ± 1.7 % of
the scanner motor's specified rotation number after the scanner motor's
NOTE
rotation has reached the specified number.
Scanner unit Malfunction
At the start of the scanner motor's rotation, when the detected cycle of the /
BDI signal does not reach the range of the specified number within 20
seconds, or when the /BDI signal is not detected for 0.5 second after the
detected cycle reached the specified value.
The Laser/scanner unit contains parts that require adjustment that must be
adjusted. Never disassemble the Laser/scanner unit.
LASER CLASS 730i/720i/710 Chapter 2: Technical Reference
2-15
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