Lens Drive System; Outline - Canon NP6320 Service Manual

CHAPTER 3 EXPOSURE SYSTEM
II. LENS DRIVE SYSTEM
A.

Outline

The lens is moved by the scanner motor (M2). Normally, the coupling gear is in its upper
position, and connects the scanner motor to the scanner drive capstan. To move the lens, the lens
solenoid (SL2) goes ON, causing the coupling gear to disengage from the scanner capstan gear and
engage with the lens capstan gear. The lens is a "floating element" type. In operation, the relative
position of the lens elements (individual lenses) changes, and the focal length changes as a result,
but the changes are to optimize lens sharpness for each reproduction ratio, not to make the lens
function as a zoom lens. (The lens should not be dismantled.)
When the scanner motor rotates (CW), the lens will be moved to the left (for enlargement) by
the capstan and cable.
When the cassette size is changed or when the copier is in the Reduce mode, the blank expo-
sure shutter moves in relation to the distance over which the lens travels, thereby blanking out the
width corresponding to the reproduction ratio; see p. 4-16.
The DC controller indicates 'E210' on the control panel in response to an error in the lens drive
system.
3-2
COPYRIGHT © 1999 CANON INC. CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)