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Table 2-4
175
175
175
175
Notes: 1. If the ihermistor-detected tem-
perature is 50°C or less when
the power is switched ON, this
temperature control is p e r -
formed for 5 minutes to improve
2. The target temperature is
switched depending on print
interval.
See Table 2-5. There are two
classification
printing
printing.
is defined as when the pick-up
system for the next printing is
operated within 12 seconds
after received /VSYNC signal.
Intermittent printing is more
than 12 seconds.
Table 2-5
3. When the continuous printing is
finished within 5 minutes it is
switched to 190°C or 195°C.
More than 5 minutes it is
switched to 185°C or 190°C.
However when it is switched a
middle
maintained 15 seconds.
4. It is 185°C from paper pick-up
start until the /VSYNC signal is
received, and then it is switched
190
190
190
190
195
continuous
a n d
i n t e r m i t t e n t
Continuous
printing
t e m p e r a t u r e
i s
to 180°C.
5. It is 185°C from paper pick-up
start until the /VSYNC signal is
received, and then it is switched
to 190°C or 195°C.
6. It is switched to 180°C after
c o n t i n u o u s printing of 25
envelopes on normal tempera-
ture control.
7. Under the initial warm-up
temperature
intermittent printings is 195°C
and the continuous printings is
205°C.
The printer has the following three
protection functions to prevent incorrect
activation of the fixing roller:
The CPU monitors the thermistor
voltage. If it is abnormal, the CPU
detects the fixing unit error, interrupts
the power to the thing roller heater, and
reports it to the video controller.
If the upper roller surface temperature
rises abnormally and the thermistor
voltage falls below about 1.~ V (230°C).
the safety circuit in the power supply
interrupts the power to the fixing roller
heater regardless of the CPU output.
If the upper roller surface temperature
rises abnormally and the thermoswitch
t e m p e r a t u r e
e x c e e d s
thermoswitch turns off, interrupting the
power to the fbdng roller heater.
control
2 1 0 ° C .
t h e
2-31
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