Other Functions; Throughput Down Control - Canon LBP6000 Series Service Manual

Table of Contents

Chapter 2

CPU of engine controller determines the fixing assembly error and shuts the fixing heater drive signal (FSRD) and also turns OFF relays to shut the power supply

to the fixing heater in the following cases. Also, it notifies the error status to the main controller simultaneously.

1) Startup error detection

- When thermistor temperature does not reach 35 deg C within 1.5 sec from heater ON.

- When the thermistor detects the temperature of 100 deg C or below during stand-by.

2) Abnormal low temperature error

- After heater ON, when the thermistor detects the temperature of 100 deg C or below at printing after the thermistor temperature reaches 50 deg C.

- After heater ON, when the thermistor detects the temperature of 55 deg C or below at sheet interval or in cleaning mode after thermistor temperature reaches

50 deg C.

3) Overheat error

When the thermistor detects the temperature of 220 deg C or over 30 times consecutively.

4) Frequency detection circuit error (200-240V series only)

When it cannot detect the frequency detection signal at fixing drive circuit even once within 3.3 sec after power ON.

2.8.3 Other Functions

2.8.3.1 Throughput Down Control

LBP3100 / LBP3010B

This machine performs the throughput down control that extends the paper interval and lower the printing speed to prevent the edge of the fixing heater from over-

heating at continuous printing of small paper (the paper with narrow width) and to prevent the fixing heater unit from overheating at high-volume continuous print-

ing.

This control extends the interval between heater on and prevents the edge of the roller of fixing assembly and the delivery unit from overheating.

This control has the following 3 modes and the operation sequence differs depending on each modes.

Mode 1: sequence (For prevention of temperature increase in the edge)

Condition: paper length is 264mm or shorter

Operation: print speed drops according to the setting item (paper type) on the printer driver. Simultaneously, control the target temperature of the fixing assembly

according to the temperature in the following table.

Mode 2: sequence (For prevention of temperature increase in the edge)

Condition: paper length is 264mm or longer while paper width is 190mm or shorter

Operation: print speed drops to 3ppm from the 2nd sheet of continuous print. Simultaneously, control the target temperature of the fixing assembly within the

range of approx. 155 deg C to 170 deg C.

Mode 3: sequence (For prevention of temperature increase in the delivery unit)

Condition: paper width is 190mm or longer

Operation: print speed drops to 5ppm from the 251st sheet of continuous. Simultaneously, control the target temperature of the fixing assembly within the range

of approx. 132 deg C to 134 deg C.