Oce 3121 Technical & Service Manual page 504

Types
The microprocessor identifies jams as follows:
Delay
The paper did not reach the appropriate sensor within the specified time: i.e.
the sensor is not ON.
Stationary
The paper did not leave the appropriate sensor within the specified time: i.e.
the sensor does not switch OFF.
Persistent
The paper remains over a sensor, with power ON. i.e. the sensor detects paper.
A jam will be signalled if any of the following occurs, during copying:
Note:
- the front door is opened,
- the right door is opened,
- the output door is opened,
- or the cassette is withdrawn.
Timing of operations
Pick-up delay
A delay will be signalled if the paper does not reach the sensor PS8 within a
specified period of time after the clutch CL3 has energised.
Timing for delay at pick-up
ed.1 12 Paper trays 523