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2.5.3 Detecting Jams
2.5.3.1 Jam Detection Outline
2.5.3.1.1 Outline
LBP5000 / LBP5100
The machine is equipped with the following paper sensors used to check the presence/absence of paper and also the movement of paper if any.
1: registration paper sensor (SR1)
2: pre-fixing paper sensor (SR5)
3: fixing delivery sensor (SR4)
The machine checks for the presence/absence of paper at a specific sensor at such times as programmed in the CPU.
When the CPU identifies a jam, the machine will stop the ongoing printing and, at the same time, indicate a message in the status window.
2.5.3.2 Delay Jams
2.5.3.2.1 Pick-up delay jam
LBP5000 / LBP5100
The machine uses a mechanism called "retry control," in which pickup operation is executed multiple times (3 times) in consideration of pickup delay jams most
often caused by minor deterioration of the pickup roller.
If the registration paper sensor (SR1) does not detect the leading edge of print paper within about 2.5 sec (in the case of the accessory cassette, 4.5 sec) after the
pickup solenoid (SL1) has gone on, the CPU executes pickup operation for a second time (retry operation), repeating the sequence up to 3 times.
2.5.3.2.2 Delivery delay jam
LBP5000 / LBP5100
If the fixing delivery sensor (SR4) does not detect the leading edge of print paper about 6.5 sec after the registration paper sensor (SR1) has detected the leading
edge of print paper, the CPU will identify the condition as indicating the presence of a delivery delay jam.
2.5.3.3 Stationary Jams
2.5.3.3.1 Pickup Stationary Jam
LBP5000 / LBP5100
If the registration paper sensor (SR1) does not detect the trailing edge of print paper about 8.6 sec after it has detected the leading edge of print paper, the CPU will
identify the condition as indicating the presence of a pickup stationary jam.
2.5.3.3.2 Delivery Stationary Jam
LBP5000 / LBP5100
The CPU checks for a delivery stationary jam after it has made sure that the jam in question is not a wrap jam.
If the fixing delivery sensor (SR4) indicates the presence of paper after the machine has fed paper over a distance of +50 mm (as determined with reference to the
length of paper detected by the registration paper sensor) following the detection of the leading edge of print paper (by SR4), the CPU will identify the condition
as indicating the presence of a delivery stationary jam.
2.5.3.4 Other Jams
2.5.3.4.1 Wrap Jam
LBP5000 / LBP5100
The CPU checks for a wrap jam after it has made sure that the jam in condition is not a delivery delay jam.
If the fixing delivery paper sensor (SR4) detects the absence of paper after the machine has fed paper over a distance of -40 mm (as determined with reference to
the length of paper detected by the registration paper sensor (SR1) following the detection of the leading edge of paper by SR4, the CPU will identify the condition
as indicating the presence of a wrap jam.
2.5.3.4.2 Start-Up Residual Paper Jam
LBP5000 / LBP5100
If the pre-fixing paper sensor (SR5) or the fixing delivery sensor (SR4) detects print paper at the start of initial rotation, the CPU will identify the condition as a
start-up residual jam.
2.5.3.4.3 Door Open Jam
LBP5000 / LBP5100
If the pre-fixing paper sensor (SR5) or the fixing delivery sensor (SR4) detects the presence of print paper while any of the machine's doors is identified as being
open, the machine will identify the condition as a door open jam.
2.5.3.4.4 Duplexing Pick-up Jam
LBP5100
The DC controller determines the duplexing pick-up jam when the paper which is fed from the duplexing pick-up position does not arrive the registration paper
sensor within prescribed time.
When the DC controller determines the jam occurrence, it stops the printing operation and notifies the video controller.
Chapter 2
0010-6139
0010-6145
0010-6146
0010-6147
0010-6148
0010-6149
0010-6150
0010-6151
0015-7826
2-27
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