User manual
95.08.23.11.31
Color LaserWriter 12/600 PS Basics & Theory 1–126
Paper Jam Detection
Outline The following paper sensors are provided to detect whether paper is
present and whether the paper is fed normally:
• PS301: Cassette paper-present sensor, located on the cassette
pickup assembly board.
• PS302: Paper registration sensor, located on the cassette pickup
assembly board.
• PS303: Paper leading-edge sensor, located on the cassette pickup
assembly board.
• PS8: Transfer drum top sensor, located within the transfer drum
assembly.
• PS6: Attraction sensor, located within the transfer drum assembly.
• PS7: Separation sensor, located within the transfer drum assembly.
• PS9: Delivery paper sensor, located with the fuser assembly.
The CPU in the mechanical controller monitors sensor timing and
compares it against what has been calculated to be normal. Abnormal
sensor timing is reported to the DC controller, which stops printer oper-
ation. The DC controller then notifies the I/O controller of the jam
condition.
There are 11 jam conditions, as described on the following pages.