Canon FY8-13EX-000, NP6218 service manual Controlling the Fixing Heater Temperature

CHAPTER 6 FIXING SYSTEM

B. Controlling the Fixing Heater Temperature

The fixing heater remains off while the copier is in standby state. To prevent fixing faults caused by low temperature, its temperature is controlled in any of the following three modes depending on the temperature at the time copying is started (as measured by the main thermistor TH1) and the number of copies to be made in continuous mode:

a.If the temperature at the time copying is started is 140°C or more, it is controlled so that it remains 180°C at all times.

• 1st to 100th copy → 180°C

b. If the temperature at the time copying is started is 120°C or more and less than 140°C, it is controlled so that it remains between 200° and 180°C depending on the number of copies to be made.

• 1st copy	→	200°C
• 2nd to 9th copy	→	195°C
• 10th to 20th copy	→	190°C
• 21st to 25th copy	→	185°C
• 26th to 100th copy	→	180°C

c.If the temperature at the time copying is started is less than 120°C or less, the temperature is controlled to 225°-180°C, 215°-180°C, or 200°-180°C selected by service mode. (See the Service Handbook.)

■Control 1	→
• 1st to 4th copy		225°C
• 5th copy	→	220°C
• 6th copy	→	215°C
• 7th copy	→	210°C
• 8th copy	→	205°C
• 9th to 20th copy	→	200°C
• 21st to 25th copy	→	195°C
• 26th to 40th copy	→	190°C
• 41st to 45th copy	→	185°C
• 46th to 100th copy	→	180°C
■Control 2 (default)	→
• 1st to 4th copy		215°C
• 5th copy	→	210°C
• 6th copy	→	205°C
• 7th to 20th copy	→	200°C
• 21st to 25th copy	→	195°C
• 26th to 40th copy	→	190°C
• 41st to 45th copy	→	185°C
• 46th to 100th copy	→	180°C
■Control 3	→
• 1st to 20th copy		200°C
• 21st to 25th copy	→	195°C
• 26th to 40th copy	→	190°C
• 41st to 45th copy	→	185°C
• 46th to 100th copy	→	180°C

COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 6-3