Canon canoscan d660u Service Manual
CHAPTER 2
2 - 21
COPYRIGHT ©
2000 CANON INC. CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 2-22
V. POWER SUPPLY
AC adapter is supplied for the scanner power source. The AC adapter converts the AC power
into +12VDC. The output DC power is converted into +5VDC in the main PCB. +5VDC is used
for the IC in the main PCB. +12VDC is supplied to the CCD and drive motor.
into +12VDC. The output DC power is converted into +5VDC in the main PCB. +5VDC is used
for the IC in the main PCB. +12VDC is supplied to the CCD and drive motor.
Protection circuit is built-in the main PCB to prevent overvoltage or reverse polarity. The
protection circuit is composed of a fuse and zener diode. If overvoltage or reverse polarity is
input, the fuse burns to protect a further circuit.
protection circuit is composed of a fuse and zener diode. If overvoltage or reverse polarity is
input, the fuse burns to protect a further circuit.
AC power
Main PCB
AC adapter
AC/DC
conversion
circuit
Drive motor
CCD
+12 VDC
+5 VDC
conversion
circuit
+12 VDC
+12 VDC
Protection
circuit