AND TIMING
Error Detection
(NP21 20)
1. Outline
error these signals causes the error detec-
The signals (LIGHT, SSRON, HTRD, TH) shown
tion circuit to
the ACOFF signal, thereby
vating the
shutoff
Figure
are input signals to the error detec-
tion circuit.
The error detection circuit
into the DC
controller, and
to monitor the surface
fixing heater, and the condition of the scanning lamp.
Fixing heater
DC
Figure
2. Mechanism
Figure
shows the error detection circuit,
and Table 3-5 lists the conditions for its activation.
The error
shutoff
goes OFF
response the output of the errordetection circuit
terms of both software and hardware.
a. Detection by Software
Ifanerrorinthesurfacetemperatureoftheupper
fixing roller (220°C) or the activation of the fixing
heater
terms of software, the error
shutoff
turned OFF immediately and
error
displayed.
CANON
RN.0
1992
IN
(IMPRIME
Summary of Contents for NP-2120
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