Canon PC980 Service Manual - Page 182

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS The scanner cooling fan (FM1) is turned on and off according to the temperature detected by the scanner thermistor (TH2). If the reading by the thermistor is 37.5°C or higher and the copying speed reaches 6 cpm, the fan starts to rotate. If the reading is lower than 37.5°C, on the other hand, the fan will not rotate if no more than one copy is made or while making the first copy of a continuous copying job. (It rotates when making the second and subsequent copies of a continuous copying job.) Power switch Copy Start key ON ON STBY INTR SCFW SCRV SCFW SCRV LSTR STBY Main motor (M1) Scanner cooling fan (FM1) Heat exhausting fan Scanner I Forward Reverse I: If 6-cpm copying speed control is executed starting with the first copy, the fan will rotate. Figure 7-102 7-2 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)