Canon iR C6800 Series, Service Manual

Page: 670 / 1404

Chapter 9
9-6
9.2 Basic Sequence
9.2.1
Sequence of Operation at PowerOn
0003-2886
The machine starts WMUPR1 (fixing idle rotation) when the surface temperature of the outside heating roller reaches
190 deg C. It then starts WMUP2 (startup sequence) when the fixing roller exceeds 200 deg C, the pressure roller
exceeds 140 deg C, and the outside heating roller exceeds 225 deg C, at the end of which it enters the standby state.
F-9-4
*1: As many as 3 heaters may simultaneously be turned on during the warmup period (other than startup sequence
WMUP2). To start up individual rollers in the shortest time possible under the limit, the fixing main heater (H1)
and the pressure heater (H34) are turned on alternately.
F-9-5
*2: As many as 2 heaters may simultaneously be turned on during WMUP2 (startup sequence). In other words,
during this period, the pressure heater (H3) may go on only when the fixing sub heater (HJ2) or the outside heating
roller heater (H4) is off.
*3: Rotates at 1/3 speed (92 mm/sec).
*4: Rotates idly for 1 sec at 1/3 speed every 30 min after the fixing roller stops.
*5: When the fixing roller reaches 200 deg C, the outside heating roller moves away from the fixing roller.
*6: During WMUP2 (startup sequence), the machine performs drum surface potential control, primary transfer
ATVC control, and DMAX control.
Fixing main
heater (H1)
Fixing sub
heater (H2)
Pressure
heater (H3)
Outside heating
roller heater (H4)
Fixing motor
(M4)
Outside heating
roller shaft motor (M22)
Number of heaters
permitted for
simultaneous activation
- when outside heating roller is 190 deg C,
starts initial multiple rotation
at end of start-up sequence,
enters standby
- fixing roller: 200 deg C
- pressure roller: 140 deg C or higher
if above is true,
starts start-up sequence
- outside roller: 225 deg C
: heater full activation.
: heater temperature control.
: activation limit control
: motor turned on.
: heater alternate activation control.
WMUP WMUPR1 (fixing idle rotation)
Controlled to 225 deg C
(in contact)
3 3
*3
STBY WMUP2 (start-up sequence)
Controlled to 200 deg C
Limit on pressure
heater activation *2
Controlled to 170 deg C
(off contact)
3 2
*5
*4
*6
Alternate activation *1
Heater full activation
Alternate activation *1
Heater full activation
ON
ON
OFF
1sec 1sec
OFF
Fixing main heater (H1)
Pressure heater (H3)