Oce 3121 Technical & Service Manual page 563

If the temperature is 140°C or more at copy start, control is exerted so that the
3
temperature will be 180°C at all times.
1st to 100th copy 180°C
Note that, a (less than 100°C at copy start) and c (100°C or more and less than
140°C) are always combined as follows; the notation "value on label" here re-
fers to the label attached to the fuser, and the settings recorded on the label may
be entered in 'FILM LAMK' in service mode (Adjust *3*) 06 to select a spe-
cific fuser control temperature.
Value on label
0
1
2
3
4
Normally, as value on the label is one of 2 through 4 is selected. Select
Note:
a higher temperature (lower value) in service mode if fusing faults occur; se-
lect a lower temperature (higher value) if offset occurs. For instance, if fusing
faults occur with 2 selected, change it to 1 or 0. Try 1 first and then try 0 if nec-
essary. If offset occurs with 2 selected, change it to 3; if offset continues,
change it to 4.
Controlling the Supply Power to the Fuser Heater
The temperature of the heater is controlled by controlling the power supplied
to the heater. The plane-shaped heater used, tends to be subject to variation be-
cause of production factors.
Because of this, you must enter the resistance in service mode (Adjust *3*) 06
'FIXER-RESIST' whenever you have replaced the fuser so that the microproc-
essor on the DC controller PCB executes appropriate power control.
Warning:
not change it unless you have replaced the fuser.
The power to the heater is controlled by means of phase power control. The mi-
croprocessor controls the output timing of the heater drive signal (HTRD) so
that power appropriate to the target temperature of the heater may be supplied
(through phase control).
506 TSM Océ 3121
a
1)
2)
3)
4)
5)
The heater resistance is entered in service mode at the factory; do
c
1)
1)
2)
3)
3)
Functional description