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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)
• Pick-up unit paper sensor (PS2)
• Fixing unit delivery sensor (PS1403)
• Face-down tray delivery sensor (PS1402)
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 pick-up delay jam 1 if the paper does not reach the pick-up unit paper sen-
sor (PS2) within the specified period of time after the pick-up operation.
Upper/lower cassettes: about 6.4 seconds
Duplexing unit (Option): about 2.4 seconds
Paper deck (Option): about 7.0 seconds
2. Pick-up delay jam 2
The CPU assesses a pick-up delay jam 2 if the registration paper sensor (PS1) cannot detect the
leading edge of the paper within about 0.7 seconds after the pick-up unit paper sensor (PS2)
detects the leading edge of the paper.
The CPU also assesses a pick-up delay jam 2 if the registration paper sensor (PS1) cannot
detect the leading edge of the paper within about 9.5 seconds after start of pick-up operation
from the multi-purpose tray or envelope feeder.
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 face-down delivery delay jam if the leading edge of the paper does not reach
the face-down tray delivery sensor (PS1402) within about 3.9 seconds after receiving the VER-
TICAL SYNC signal (/VSYNC).
6. Face-down delivery stationary jam
The CPU assesses a face-down delivery stationary jam if the trailing edge of the paper does not
pass through the face-down tray delivery sensor (PS1402) within the specified period of time (T2)
after receiving the VERTICAL SYNC signal (/VSYNC).
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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CHAPTER 2