Canon FAX-L1000 - Manual (Page 202)

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FAX-L1000 Chapter 3: Technical Reference
• This fax machine does not have "-ACVIN signal".
• If the ECNT board CPU detects with the thermistor that the fixing heater temperature is
over 428°F (220°C), it cuts off the power to the fixing heater (Software protection).
• If the ECNT board fixing heater protective circuit detects that the fixing heater temperature
is 464°F (240°C), it cuts off the power to the fixing heater regardless of the ECNT board
CPU output (Hardware protection).
• If the fixing heater temperature is over 446°F (230°C), the thermal fuse in the fixing film
unit blows, turning the fixing heater off.
• The ECNT board CPU detects thermistor broken wire in the following cases, and assesses
warm-up error or abnormally low temperature.
1. The thermistor, in the low-temperature detection mode, does not exceed about
68°F(20°C) within about 0.7 seconds after the heater is turned ON.
2. The thermistor, in the high-temperature detection mode, does not exceed about
122°F(50°C) within about 5.0 seconds after the heater is turned ON.
3. The thermistor, in the high-temperature detection mode, detects over about 122°F(50°C)
after the heater is turned ON. Then the output voltage from the thermistor is more than
about 3.4V for more than about 100ms continuously.
• The ECNT board CPU detects heater broken wire in the following cases and assesses warm-
up error or abnormally low temperature.
1. The thermistor, in the low-temperature detection mode, does not rise +50°F(+10°C) from
the initial temperature within about 2.5 seconds after the heater is turned ON.
2. The thermistor, in the low-temperature detection mode, does not rise +68°F(+20°C) from
the initial temperature within about 2.5 seconds after rising +50°F(+10°C) from the
initial temperature since the heater is turned ON.
3. The thermistor, in the high temperature detection mode, does not exceed about
320°F(160°C) within about 20 seconds after rising +68°F(+20°C) from the initial
temperature since the heater is turned ON.
4. When the thermistor is in the high temperature detection mode and the initial
temperature is 185°F(85°C) or below, the temperature does not exceed about
320°F(160°C) within about 20 seconds after the heater is turned ON.