Brother International IntelliFax-4750 Service Manual - Page 86
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• When securing the lock plate R with screw "d," be sure to use the plastic jig as shown below to avoid damaging the edge of the FU lamp with a screwdriver. Lock plate R "d" FU lamp Plastic jig • A new heat-fixing unit will be provided with the heater thermistor harness being taped to the unit. Before installing the unit, remove the tape. • When setting the heat-fixing unit back into place, make sure that the heater wires are routed through the latch of the fan duct (see the illustration given on page IV-34) and then route the long heater wire as shown below. • If you remove and reinstall the heat-fixing unit because of any failure, make the equipment enter the maintenance mode (by pressing the Function/Menu, * 2, 8, 6, and 4 keys) after completion of reassembly and then make it exit from the mode (by pressing the 9 key twice). Otherwise, the heat-fixing unit may not become energized because of the following reason: If the failure of the heat-fixing unit is caused by an opening of the thermistor circuit (that senses the temperature of the heat-fixing unit), the system misinterprets the hot heater as being cold. As a result, the temperature of the heat-fixing unit may become excessively high. To prevent the system from heating the hot heater further at the next powering-on, it is designed so that the heater will not be energized. To cancel this setting, you need to carry out the above maintenance-mode procedure. IV - 33