Service manual

CHAPTER 2
2 - 20
COPYRIGHT  2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 2-19
VI. POWER SUPPLY
DC power is supplied from the supplied AC adapter. Through power regulator, four DC power
sources (+3.3V, +5V, +12V and +16.8V) are used in the circuit. +3.3V and +5V are supplied for
the digital circuit and linear chip, +5V is for the Analog IC and home position sensor, +16.8V is
for the CCD PCB, +12V is for the scanning lamp, and +24 for the motor drive.
CCD
12V
CCD PCB
Main PCB
16.8V to 12V
Regulator
Analog IC
Drive
Motor
FAU
Inverter
Scanning Lamp
FAU Lamp
Inverter
Motor Driver
24V to16.8V
Regulator
24V
AC Adapter
+5V Regulator
+3.3V Regulator
Digital Circuit
IR LED
Home Position
Sensor
+12V Regulator