Canon LBP 2460 - B/W Laser Printer Service Manual page 258

CHAPTER 4
M-12 Horizontal Registration Guide Failure (When the Duplexing Unit is Installed)
<Possible causes>
1. The horizontal registration guide home position sensor signal line and horizontal registration
motor drive signal line connectors are loose.
Action: Reconnect connectors J2005 and J2006 on the duplexing driver PCB.
2. Gears are damaged.
Action: Replace any damaged gears.
3. The horizontal registration guide home position sensor is defective.
Action: Check the sensor state using the printer driver tester. If it is defective, replace the
sensor.
4. The horizontal registration motor is defective.
Action: Replace the horizontal registration motor.
5. The duplexing driver PCB is defective.
Action: Replace the duplexing driver PCB.
M-13 No AC Power Input (printer)
<Possible causes>
1. The correct voltage is not present at the outlet.
Action: Inform the customer that the correct line voltage is not available at the outlet.
2. The power cord is not firmly plugged into the printer, the paper deck, and the outlet.
Action: Push the power plugs in firmly.
3. The circuit breaker is off.
Action: Remove the power supply. Press the circuit breaker button to set the circuit breaker
ON.
Turn the circuit breaker on 30 seconds after it is turned on.
Before plugging the power cord into the outlet, turn the power switch ON and
check the AC line circuit short and the circuit breaker states (continuity and
contact resistance) using a multimeter.
4. The power switch is defective.
Action: Remove the power supply. Measure the resistance between the two terminals of the
power switch by applying the tester probes to the terminals. The resistance must be
zero V when the power is turned ON, and
Otherwise, replace the power supply.
5. The AC power line is defective.
Action: Replace the power supply.
M-14 No Power Input (paper deck)
<Possible causes>
1. The correct voltage is not present at the outlet.
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when the switch is turned OFF.