Canon Color imageRUNNER C4580, Service Manual

Page: 464 / 851

Chapter 11
11-27
11.2.5 Checking Life
11.2.5.1 Lifetime Detection of Fixing Assembly Belt Unit
The lifetime of the fixing assembly is estimated by the following three values.
When the following three values reach their thresholds, message and E008-0001 are displayed.
The main cause of reducing the lifetime is torque increase of the fixing drive motor. It is mainly because the
message is displayed by reading the current (torque) running through the fixing drive motor.
1.Current Value (Torque) Flowed Into the Fixing Drive Motor
By monitoring the current amount flowed into the fixing motor (M24), detect the life of the fixing unit.
As the fixing/pressure belt is worn, the amount of oil inside of the fixing/pressure belt decreases so that the
frictional force inside of the belt becomes greater.
As the frictional force gets greater, the torque of the fixing motor becomes higher to rotate the drive roller;
hence, the current amount (voltage) flown into the fixing motor also becomes higher. Monitor this current
amount ((V1-V2)/É÷) and when it reaches to the specified level (warning level), the warning message is
displayed on the control panel. As the fixing/pressure belt is worn further, the current amount reaches to the
specified level (error level) and E008-0001 is displayed (a message is also displayed on the service mode initial
screen.)
As a rough estimation, the decrease of the oil amount that determines the life of the fixing unit starts around
300,000
sheets (fixing delivered number). Hence, by checking the fixing delivered number with the service
mode (COPIER > FUNCTION > DRBL-1 > FX-BLT-U), the occurrence timing of the warning and the error
can be predicted to some extent.
The estimated number of copies from the warning message to the error is about 10,000 sheets.
Current value (torque) Control panel display
Message display threshold
User display: Replace the fixing unit.
Service mode: replace the fixing Unit
Error display threshold E code display
Display E008-0001