Canon LBP 2460 - B/W Laser Printer Service Manual page 260

CHAPTER 4
supply output of the connector J204. Do not short the connector. If the correct
value is not output, replace the power supply.
5. Wiring, DC load, DC controller PCB
Action: Turn the power switch OFF. Check the wiring from the DC controller PCB and the
DC load. If they are normal, replace the DC controller PCB.
M-16 Lifting Plate not rising (paper deck)
<Possible causes>
1. The tray is not correctly installed.
Action: Reload the tray.
2. The paper size detection lever is not being pressed as the paper guides are not properly
inserted.
Action: Insert the paper guides correctly.
3. The side and end guides are not installed in the correct paper size slots. (For example, the
side guide is in the B4 or legal slot, whereas the end guide in the letter or A4 position.
Action: Insert the width and trailing edge guides properly
4. Cut wire.
Action: Replace the wire.
5. Damaged gear
Action: Check the gears, and replace if damaged.
6. Defective lifter clutch
Action: Remove connector J119 from the lifter clutch. Measure the resistance between
connectors J119-1 and J119-4 on the clutch side. Replace the lifter clutch if the
resistance is not about 155 .
7. Faulty lifter abnormal position sensing switch
Action: Remove connector J121 from the lifter abnormal position sensing switch. Measure
the resistance between connectors J121-1 and J121-2 on the switch side. Replace
the switch if the resistance is
8. Defective sensor lever
Action: Adjust the lever so it moves smoothly. Replace if damaged.
9. Defective paper surface sensor
Action: Pull the tray half way out and lower it. Turn the printer power ON. Measure the
voltage between connectors J208-8 (LIFT) and J208-10 (GND) on the paper deck
driver PCB. Replace the sensor if the voltage is about 5V.
10. Defective paper-size sensing switch PCB
Action: Replace the paper-size sensing switch PCB.
11. Defective paper deck driver PCB
Action: Replace the paper deck driver PCB.
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