Technical information

B OPERATIONS AND TIMING
F. Jam Detection
The copier monitors the movement of copy paper
using the following three sensors:
* Pre-registration sensor (Q3)
- Separation sensor (Q5)
- Delivety sensor (SWB)
Jams are identified in terms of the presencel
absence of paper at respective sensors at such
times as programmed in the microprocessor in ad-
vance.
The copier has mechanisms that remember the
“remaining number of copies” and the “copy modes”
in response to a jam, and such data are retained for
about ten minutes after the front cover is opened,
cutting out the power.
The microprocessor holds the following five jam
detection sequences and, further, it identifies a jam
if paper is detected at time of power-on.
When the copier identifies a jam, it immediately
stops operation and cuts out power to the fixing
heater (HI); at the same time, it flashes the ‘JAM’
indicatoron the control panel, indicating the location
of the jam.
No count is taken for jams which activate these
mechanisms.
Photosensitive drum
Upper fixing roller
ka
++ , 1 ~ ~+> ~~ , r,.Eg~strationroller
0
Delivery sensor (SWB)
Separation sensor (as)
Pre-registration sensor
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3-48
Figure 3-46
COPYAIGHT Q 1592 CANON ING. CANON NP2120/2MO NEXO MAY IP30 PRINTEO IN JAPAN IIMPNIME AU JAPOH)