Canon CLBP-460PS, Service Manual

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1) Defective 90-fan
Action: Replace the 90-fan if the voltage between the 90-fan connector J209-3 (90FAN24V)
and J209-1 (GND) changes from 0V to about 24V immediately after the printer is
turned ON.
2) Poor contact in 90-fan drive connector
Action: Reconnect the connectors between the 90-fan and DC controller PCB correctly.
3) Defective DC controller PCB
Action: Replace the DC controller PCB.
4) Defective developing PCB
Action: Replace the developing PCB.
[ 6-6 ] “SERVICE CALL NOTE # B3” 40-fan (FAN3) malfunction
<Possible causes>
1) Defective 40-fan
Action: If the voltage between the 40-fan connector J77-3 (40FAN24V) and J77-1 (GND)
changes from 0V to about 24V right after the printer is turned ON, replace the 40-
fan.
2) Poor contact in 40-fan drive connector
Action: Reconnect the connectors between the 40-fan and DC controller PCB correctly.
3) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-7 ] “SERVICE CALL NOTE # C1” Scanner unit malfunction
<Possible causes>
1) Poor contact in the laser/scanner unit connector
Action: Reconnect the BD PCB connector J551, the scanner motor connector J1103, and
the DC controller PCB connector J1006 correctly.
2) Defective laser/scanner unit
Action: Replace the laser/scanner unit.
3) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-8 ] “SERVICE CALL NOTE # C2” Laser unit malfunction
<Possible causes>
1) Poor contact in the LASER DRIVE signal line connector
Action: Reconnect the laser driver PCB connector J1101 and J1102 and the DC controller
PCB connector J1007 and J1008 correctly.
2) Poor contact in the BD detection line connector
Action: Reconnect the BD PCB connector J551 and the DC controller PCB connector J1006
correctly.
3) Defective laser/scanner unit
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CHAPTER 4