Page 19 - MF3010Series Service Manual (Rev.0) (1)-017-045 (1)

2 Technical Overview > Fixing System > Various Control Mechanisms > Protective Functions
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Various Control Mechanisms Fixing target temperature varies according to the fixing mode, and there are 8 types of the
mode.
■ Fixing Temperature Control These modes are determined according to the paper type settings and resolution settings (see
the caution) in a driver.
● Heater Temperature Control The following table shows the relationship between the fixing target temperature and the
The heater temperature control is to keep the fixing heater in the fixing film unit to the settings (paper type settings and resolution settings) in a driver.
specified temperature.
Printer driver settings
The engine controller monitors the Fixing Heater (H1) temperature detection signal (FSRTH) Paper type settings Vertical scanning Fixing target
temperature
and outputs the fixing heater drive signal (FSRD) according to the detected temperature. Plain paper 600 dpi 155 to 165 deg C
The fixing heater drive PCB controls the Fixing Heater (H1) according to this signal to keep 400 dpi 170 to 190 deg C
the fixing heater temperature within the target values. Plain paper L 600 dpi 145 to 155 deg C
400 dpi 160 to 180 deg C
Heavy paper 600 dpi 170 deg C
Engine controller Heavy paper H 600 dpi 185 deg C
Transparency 600 dpi 150 to 160 deg C
Low-voltage Fixing control 400 dpi 165 to 180 deg C
CPU power supply +24V
Postcard/postcard H 600 dpi 188 deg C
Relay drive 400 dpi 188 deg C
FU101
circuit Envelope 600 dpi 160 to 165 deg C
Frequency Labels 600 dpi 170 deg C
FREQSNS RL101
detection T-2-5
circuit
(220-240V model only) Fixing heater CAUTION: Resolution switching
safety circuit
Fixing heater
FSRD The machine provides two types of resolution: 600 x 600 dpi and 600 x 400 dpi.
drive circuit
RLYD (24VOFF) The selection is made by the "Copy Type" setting in the printer driver.
For speed priority (at the time of shipment), 600 x 400 dpi is selected, but changing to
FSRTH
resolution priority selects 600 x 600 dpi.
Fixing heater (H1)
Thermistor (TH1)
■ Protective Functions
Pressure
roller ● Protective Function of fixing assembly
Host machine carries the following 3 functions to prevent the Fixing Heater (H1) from
Fixing film overheating.
Thermal fuse (TP1)
1) Protective function by CPU
F-2-23
CPU of engine controller monitors the Thermistor (TH1) temperature consistently.
When Thermistor (TH1) reaches approx 220 deg C, CPU determines that the Fixing Heater
(H1) is overheating and stops the fixing heater drive signal (FSRD) output and also turns
OFF relays to shut the power supply to Fixing Heater (H1).

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2 Technical Overview > Fixing System > Various Control Mechanisms > Protective Functions