Protection Features - Canon imageRUNNER 2525 Series Service Manual

• The fixing motor drive speed is controlled as follows by detecting the paper loop between transfer roller and fixing roller with
the loop sensor.
1. The fixing motor drive speed is reduced by 3.1% when the reading edge of paper is fed 35mm from the transfer roller.
The reduced speed is kept until the loop sensor is turned on by the formed paper loop.
2. After detecting the ON condition of the loop sensor for 50 msec continuously, the fixing motor drive speed is increased
by 0.8% compared with the process speed. The increased speed is kept until the loop sensor is turned off by the deleted
paper loop.
3. After detecting the OFF condition of the loop sensor for 50 msec continuously, the fixing motor drive speed is reduced
by 3.1% compared with the process speed. The reduced speed is kept until the loop sensor is turned on by the formed
paper loop.
4. Repeat steps 2) and 3). The fixing motor drive speed is increased by 0.8% compared with the process speed when the
trailing edge of paper reaches 65 mm before coming out of the registration roller.
5. When continuously making prints, return to step 1). When making a single print, shift to the last rotation.

■ Protection features

Code
E000 Fixing temperature abnormal rise
0001 The temperature detected by the main thermistor does not rise to the specified value during startup
control.
E001 Fixing unit temperature rise detection
0000 The reading of the main thermistor is 250 deg C or more continuously for 200 msec.
0001 The hardware circuit detects overheating of the main or sub thermistor for 200 msec.
0002 The reading of the sub thermistor is 295 deg C or more continuously for 200 msec.
E002 Fixing unit temperature insufficient rise
0000 1.The reading of the main thermistor is less than 115 deg C continuously for 400 msec 1.3 sec after
it has indicated 100 deg C.
2.The reading of the main thermistor is less than 150 deg C continuously for 400 msec 1.3 sec after
it has indicated 140 deg C.
E003 Low fixing temperature detection after standby
0000 The reading of the main thermistor is less than 140 deg C continuously for 400 msec or more.
E004 Thermistor disconnection detection error
0000 When disconnection is detected with connector (J214) for 30 sec continuously.
E014 Unstable rotation of the Fixing Motor (M2)
0001 Detection is executed every 100 msec after the start of motor rotation; however, the drive detection
signal is absent for 2 sec.
0002 During motor rotation, detection is executed every 100 msec; however, the drive signal is absent 5
times in sequence.
E261 Error in Zero Cross
0000 Zero Cross failed to be detected for 500ms or more while the relay was ON.
* The same condition is detected after the error retry is performed.
CAUTION:
<Related Service Mode>
• CLEAR > ENGIN > ERRCLR
Error code clear
Description
75
2. Technical Explanation
Error Clear
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No