Paper Jam Detection - Canon LBP-860 Service Manual

E Paper Jam Detection
To detect the presence of paper and whether or not the paper has been fed correctly, the
following paper sensors are provided:
. Resist paper sensor IPS602)
. Delivery paper sensor (PS201)
The microprocessor (CPU) determines if a paper jam has occurred by checking whether paper is
present at the sensor within the amount of time specified in the memory.
video controller to notify it.
1. Pick-up unit delay jam
The microprocessor detects a pick-up unit delay jam if the paper does not reach the resist
paper sensor (PSSOZ) within the required time after the paper is picked up,
Cassette pnk-up roller clutch
M? tray pick-up roller clutch
solenoid (SL702)
Jam check
Main motor (Ml)
3.76 swonds (upper cassclte). 2.85 seconds (multi-purpose tray).
2. Pick-up unit stationary jam
The microprocessor detects a pick-up unit stationary jam when the resist paper sensor (PS602)
detects the sheet of paper within the required time after the VERTICAL SYNC signal [/VSYNC)
has
been received.
VERTICAL SYNC REQUEST
signal (NSYNC)
Jam check
6.6 seconds (ExecutIveI. 8.49 seconds [Universal). 6.39 seconds (Envelope feeder)
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PRINT
n
+- Tl ~---+/
I
Normal
Figure 2-38
(Unit: Seconds)
PRINT
Figure 2-39