Canon NP7161 User Manual Page 170

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CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
7–2
COPYRIGHT
©
1998 CANON INC. CANON NP7160/NP7161 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
The exhaust fan (FM2) and the sorter kit fan (FM5) are rotated at half speed during standby
to prevent heating inside the machine. If the reading of the cleaner thermistor (TH3) is 50°C or
more (38°C or more if the sorter kit is installed), all fans will be rotated at full speed.
Sequence
Power switch
ON
Power switch
OFF
Start key
ON
WMUP WMUPR STBY INTR SCFW SCRV LSTR STBY
Cooling fan 1 (FM1)
*1
*1:If sorter kit is installed. : Full-speed rotation.
Exhaust fan 1 (FM2)
Exhaust fan 2 (FM4)
: Half-speed rotation.
Sorter kit fan (FM5)
Figure 7-102
The speed of the exhaust fans is switched between full speed and half speed by switching the
drive voltage of the exhaust fans as shown in Figure 7-103.
When the CPU generates FMON=1, +24 V is supplied so that the exhaust fans (FM2, FM4,
FM5) rotate at full speed. In response to FMHLF=1, on the other hand, +15.4 V will be supplied
so that the exhaust fans (FM2, FM5) rotate at half speed.
FM
GA
FMHLF
FMON
+15.4v
+24v
DC controller PCB
Fan
FM-DRIVE
FM-DETECT
GND
IC113
CPU
IC119
Figure 7-103
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