Brother 1920CN - Color Inkjet - Fax Service Manual page 86

• 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.
FU lamp
• 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-41) 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 machine enter
the maintenance mode (see Note) 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.
(Note) Entry into the maintenance mode
Machines w/ fax: Press the Function/Menu, *, 2, 8, 6, and 4 keys.
Machines w/o fax: Press the Menu, 0, 2, 8, 6, and 4 keys.
Lock plate R
IV - 40
"d"
Plastic jig