Canon iR1600 Technical Information Seite 260

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CHAPTER 8 EXTERNALS AND AUXILIARY CONTROL SYSTEM
COPYRIGHT
©
2002 CANON INC. 2000 CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
8-10
4.2 Control
4.2.1 Controlling the Speed
The machine’s heat discharge fan (FM101) is subjected to 2-speed control (full-speed and
half-speed) as follows:
[1] Full-Speed Control
When the ASIC on the DC controller PCB causes the fan ON signal (FANON) to go ‘1’
and the fan full-speed rotation signal (FANFULL) to go ‘1’, the drive voltage control
block supplies fan drive voltage (FANDRV) of +24 V to rotate the heat discharge fan to
rotate at full speed.
[2] Half-Speed Control
When the ASIC on the DC control PCB causes the fan ON signal (FANON) to go ‘1’
and the fan full-speed rotation signal (FANFULL) to go ‘0’, +16V fan drive voltage
(FANDRV) is supplied to rotate the heat-discharge fan at half speed.
F08-402-01
J106
+24V
Heat discharge fan
(FM101)
FANDRV
FANLOCK*
FANON
FANFULL
ASIC
Drive voltage
control block
CPU
DC controller PCB
15
16
14
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