Target Temperatures By Mode; Protection Function; Outline - Canon LASER CLASS 810 Service Manual

Chapter 9

9.2.2.2 Target Temperatures by Mode

This machine controls the fixing temperature according to the "media type" selected in the user mode and the "target temperature" set in the "special mode."
The correspondence between each mode and target temperature is as follows:
Paper type
Plain paper/colored
paper/recycled paper/
heavy paper1(81-90g/
m2)
Heavy paper2(91 to
105g/m2)
Heavy paper3(106 -
128g/m2)
Transparency
Envelopes
Labels
3hole punch paper
*1: Target fixing temperature at startup. When the initial temperature of the fixing unit is high, the target temperature is lowered. In the continuous copy mode, the
target temperature is lowered.
*2: Number of sheets controlled at the initial target temperature. If it is exceeded, the target temperature is lowered. The prescribed number of sheets varies with
the paper size.

9.3 Protection Function

9.3.1 Outline

This circuit is installed on the DC controller PCB. It is used to monitor abnormal rise of the fixing temperature at all times. If the main thermistor's output voltage
is held below about 0.78 V (about 235 deg C or higher) for at least 1 second or the sub-thermistor's output voltage is held blow about 0.39 V for 0.15 seconds or
longer due to the rise in the fixing heater temperature, the relay is turned off and the fixing heater is turned off irrespective of the relay drive signal (RLYD).
If the temperature of the fixing heater increases abnormally, on the other hand, to exceed about 228 deg c, the temperature fuse will melt to cut the power to the
fixing heater.
9-4
Cassette Manual Duplex Fixing mode
pickup feed tray
pickup
Yes Yes Yes Plain paper
- Yes - Heavy paper
- Yes - Heavy paper H
- Yes - OHP
- Yes - Envelope H /Envelope L
- Yes - Heavy paper
Yes Yes Yes Plain
T-9-3
Target Initial number of
initial fixing sheets (*2)
temperature
(*1)
210 deg C 1-30 (A4/LTR)
185 deg C 1-30 (A4/LTR)
210 deg C 1-30 (A4/LTR)
215 deg C 1-30 (A4/LTR)
195 deg C 1-30 (A4/LTR)
215 deg C 1-5
210 deg C 1-5 (A4/LTR)
210 deg C 1-30 (A4/LTR)
185 deg C 1-30 (A4/LTR)
0016-7790
Reamarks
Special Mode S: OFF
Special Mode S: ON
The controller changes
fixing mode by size.
Special Mode S: OFF
Special Mode S: ON
0016-7791