Power Supply; Vi. Power Supply - Canon CanoScan 9900F Service Manual

CHAPTER 2

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.
24V
AC Adapter
2 - 20
Main PCB
+3.3V Regulator
+5V Regulator
12V
24V to16.8V
Regulator
Motor Driver
+12V Regulator
Inverter
Inverter
Figure 2-19
COPYRIGHT 2003 CANON INC. CANOSCAN 9900F REV.0 FEB. 2003 PRINTED IN JAPAN (IMPRIME AU JAPON)
Digital Circuit
Home Position
Sensor
Analog IC
16.8V to 12V
Regulator
Scanning Lamp
FAU Lamp
IR LED
FAU
CCD PCB
CCD
Drive
Motor