Service manual
Table Of Contents
- CANOSCAN 9900F
- Chp.1: General Descriptions
- Chp.2: Operation and Timing
- Chp.3: Mechanical System
- Chp.4: Maintenance and Servicing
- Chp.5: Troubleshooting
- Service Manual Menu
- Main Menu
CHAPTER 2
2 - 7
COPYRIGHT
2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
Host
Computer
ASIC
GND
CCD
PCB
GND
Inverter
PCB
Scanning Lamp
Main PCB
LAMP
CCD
Document Glass
Lens
FARE Unit
Scanning Unit
B. Lamp Lighting Circuit
1. Scanning Lamp Lighting Circuit
When the scanner is turned on, or the host computer sends a scan command, ASIC turns on
the scanning lamp lighting signal (LAMP) to light the scanning lamp.
The reflected light of the original is focused on CCD (charge-coupled device) via the five
mirrors, lens and FARE unit.
The scanner is equipped with a lamp OFF function for energy saving. A built-in timer
automatically turns off the lamp if no scanning command is sent from the host computer for a
certain period of time. Setting up of the timer is conducted by the device driver.
Figure 2-6