
CHAPTER 2
D. Paper Jam Detection
The following paper sensors are provided to detect whether paper is present and whether the paper is fed normally.
•Registration paper sensor (PS1)
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•Fixing unit delivery sensor (PS1403)
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The microprocessor (CPU) determines whether paper is jammed by checking whether paper is present or absent at the sensors, at times stored in memory.
If the CPU determines that a jam has occurred, it stops print operation and notifies the jam to the video controller.
1. Pick-up delay jam 1
The CPU assesses a
Upper/lower cassettes: about 6.4 seconds
Duplexing unit (Option): about 2.4 seconds
Paper deck (Option): | about 7.0 seconds |
2.
The CPU assesses a
The CPU also assesses a
3. Fixing unit delivery delay jam
The CPU assesses a fixing unit delivery delay jam if the leading edge of the paper does not reach the fixing unit deliver sensor (PS1403) within about 2.2 seconds after receiving the VERTICAL SYNC signal (/VSYNC).
4. Fixing unit delivery stationary jam
The CPU assesses a fixing unit delivery stationary jam if the trailing edge of the paper does not pass through the fixing unit delivery sensor (PS1403) within the specified period of time (T1) after receiving the VERTICAL SYNC signal (/VSYNC).
Ledger=about 5.3 seconds, Legal=about 4.7 seconds, Letter=about 3.8 seconds, A3=about 5.2 seconds, B4=about 4.8 seconds, A4=about 3.7 seconds
5. Face-down delivery delay jam
The CPU assesses a
6. Face-down delivery stationary jam
The CPU assesses a
Ledger=about 7.0 seconds, Legal=about 6.4 seconds, Letter=about 5.5 seconds, A3=about 6.9 seconds, B4=about 6.5 seconds, A4=about 5.4 seconds
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