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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.
If it detects a jam. the microprocessor immedialely stops printing, and sends a signal to the
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
solerod (SL701)
M? tray pick-up roller clutch
solenoid (SL702)
Pick-up command
Jam check
Reglst paper sensor (PS602)
Main motor (Ml)
1'1:
3.76 swonds (upper cassclte). 2.85 seconds (multi-purpose tray).
I2.00
seconds (mvrlrrpc f&deer]
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
Reglst paper sensor (PS602)
Main motor (Ml)
'I"2 7.24 seconds (A4). 6 39 seconds 185). 6.87 seconds (Letter). 8.49 seconds (Legal)
6.6 seconds (ExecutIveI. 8.49 seconds [Universal). 6.39 seconds (Envelope feeder)
/PRNT
(Unft Seconds)
v
SIBY INTRl
PRINT
n
+- Tl ~---+/
-I
I
I
Figure 2-38
/PRNT
(Unit: Seconds)
v
1
STBY INTR
PRINT
Figure 2-39
5
\
I
\
1
Normal
I
1 Normal
I
CHAPTER 2
2 - 33
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