Canon GP405 Service Manual page 65

EXPOSURE SYSTEM
I. OUTLINE OF OPERATIONS ......3-1
A. Outline ....................................3-1
B. Sequence of Operations
(original exposure system) .....3-2
II. SCANNER DRIVE SYSTEM .......3-3
III. CONTROLLING THE SCANNING
LAMP...........................................3-4
A. Outline ....................................3-4
B. Controlling the Pre-Heating
Mechanism .............................3-5
C. Turning On and Off the
Scanning Lamp ......................3-5
D. Controlling the Intensity .........3-5
E. Detecting Errors .....................3-6
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3
IV. IDENTIFYING THE SIZE OF AN
ORIGINAL ................................... 3-7
A. Outline ....................................3-7
B. Identifying the Size by the
Paper Sensors (1) .................. 3-7
C. Identifying the Size by the
Paper Sensors (2) .................. 3-9
D. Identifying the Size by the
Original Width/Length Sensor
of the Feeder ....................... 3-10
V. DISASSEMBLY/ASSEMBLY .... 3-11
A. Scanning System ................ 3-12
B. Scanner Drive Assembly ..... 3-13