Recording Paper Pickup Jam Detection Configuration; Pick-Up Delay Jam; Pick-Up Stationary Jam; Delivery Delay Jam - Canon LASER CLASS 730i Service Manual

LASER CLASS 730i/720i/710 Chapter 2: Technical Reference

3.2 Recording Paper Pickup Jam Detection Configuration

Recording paper pickup jams are detected by the photo-interrupter type recording paper pickup
sensor equipped with an actuator arm.

3.2.1 Pick-up delay jam

This machine performs retry control to redress the pick-up delay jam caused by pick-up error.
If the top-of-page sensor cannot detect the leading edge of the paper within a specified period
of time (T) after the start of pick-up operation, the machine performs pick-up operation once
again. If the top-of-page sensor cannot detect the leading edge of the paper within the
specified period of time (T) after the start of the second pick-up operation, the CPU judges it a
pick-up delay jam.
The specified period of time (T) mentioned above is as follows.
• Paper pick-up from the multi-purpose tray: T= about 2.5 seconds
• Paper pick-up from the cassette: T= about 3.0 seconds

3.2.2 Pick-up stationary jam

a. When WAIT period starts
The CPU assesses a pick-up stationary jam if the top-of-page sensor detects paper when the
WAIT period starts.
b. During paper feeding
The CPU assesses a pick-up stationary jam if the top-of-page sensor does not detect the
trailing edge of the paper within 3.8 seconds (legal paper) after detecting the leading edge.

3.2.3 Delivery delay jam

The CPU assesses a delivery delay jam if the paper does not reach the delivery sensor within a
specified period of time (T) after the top-of-page sensor detects the leading edge.
• Paper 270 mm or more: T= about 2.6 seconds
• Paper 200 mm to 270 mm: T= about 2.7 seconds
• Paper less than 200 mm: T= about 4.6 seconds
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