Konica Minolta bizhub C250 Service Manual page 142

Theory of operation ver. 3.0 Aug. 2006
20.3.9 Warm-up control
• There are two modes for the warm-up control depending on the temperature inside the
unit at the beginning of the warm-up.
• The temperature inside the unit is determined by the temperature three minutes after the
warm-up has started.
Temperature inside the unit at the beginning of the warm-up
A. When the temperature inside the unit is more than 17°C at the beginning of the
warm-up
• Target control temperature
Name
Heating roller thermistor/1
Fusing pressure roller thermistor/1
･ Conditions for completing the warm-up.
Name Symbol
Heating roller
thermistor/1
Fusing pressure
2
roller thermistor/1
B. When the temperature inside the unit is 17°C or under at the beginning of the
warm-up.
• Target control temperature
Name
Heating roller thermistor/1
Fusing pressure roller thermistor/1
• Conditions for completing the warm-up
Name Symbol
Heating roller
thermistor/1
Fusing pressure
roller thermistor/1
20.3.10 Temperature control during low power mode
• The temperature control is performed at the lower temperature in order to save the power
consumption during standby state.
A. Contents of control
• Target control temperature
Name
Heating roller thermistor/1
Fusing pressure roller thermistor/1
Symbol
TH1
TH2
Conditions for completing the warm-up
When the tempera-
TH1
ture reached 143°C
When the tempera-
TH2
ture reached 140°C
Symbol
TH1
TH2
Conditions for completing the warm-up
When the tempera-
TH1
ture reached 155°C
When the tempera-
TH2
ture reached 155°C
Symbol
TH1
TH2
More than 17°C
Target control temperature
168°C
168°C
• Temperature will be controlled up to 168°C for
both TH1 and TH2 when no printing is demanded.
• When the printing is demanded during the tem-
perature control for between 143 and 168°C, the
print temperature control will start.
Target control temperature
168°C
168°C
• Temperature will be controlled up to 168°C for
both TH1 and TH2 when no printing is demanded.
• When the printing is demanded during the temper-
ature control for between 155 and 168°C, the print
temperature control will start.
Target control temperature
140°C
140°C
20. Fusing section
17°C or less
109