Canon MF4690 - ImageCLASS B/W Laser Service Manual

Also see for ImageCLASS MF4690: Reference guide Instructions Starter Guide Operation guide Driver guide

Contents

Chapter 88-4In order to prevent temperature increase at the end of the fixing film that occurs when putting papers on one side and passing them through the machine while thepaper width guide is fully opened, the machine has the delivery paper width sensor.The relationship between paper size when putting papers on one side and passing them through the machine and the fixing mode is shown below. (E and F indicatepaper size.)F-8-4T-8-3*1: Eight modes, except envelop/small size paper*2: When setting papers at the end of the paper guide and passing them through the machine, it becomes the small size paper mode regardless of paper length.Memo:The following are the throughput at down sequence.8.3 Protection Function8.3.1 Protection Function 0016-1860In order to prevent the fixing heater runaway, the machine has the following 3 protection functions.1. Protection function with CPU2. Protection function with the fixing heater safety circuit3. Protection function with the temperature fuseThe description of each function is as follow:1. Protection Function with CPUCPU always monitors voltage of the fixing heater temperature detection signal sent from the thermistor. If the fixing temperature greatly exceeds the specified value,CPU judges as failure of the fixing assembly, and it blocks the power distribution to the fixing heater.Moreover, error (E000) is displayed in the operation part at the same time.Paper length Paper width sensor Delivery paper width sensor Fixing modeE No object *2 Detect Not detect Small size paper modeF No object *2 Not detect Detect Small size paper modeFixing mode Number of fixed sheets ThroughputPlain paper - 20 ppmThick paper - 16 ppmThick paper H - 8 ppmEnvelope 5 or less15 or less40 or less41 or more9 ppm7 ppm5 ppm4 ppmPostcard/double postal card 5 or less15 or less40 or less41 or more5 ppm4 ppm3 ppm3 ppmE267.4 mmPS802 PS804F