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CHAPTER 4
2.The laser drive signal line connectors are loose.
Action: Reconnect connector J1001 on the laser driver PCB, and connector J202 on the DC controller PCB.
3.The laser/scanner unit is defective. Action: Replace the laser/scanner unit.
4.The DC controller PCB is defective. Action: Replace the DC controller PCB.
<Possible causes>
1.The main motor drive signal line connectors are loose.
Action: Reconnect connector J12 of the main motor and connector J218 on the DC con- troller PCB.
2.The door switch on the switch/sensor PCB is defective.
Action: Remove connectors J205 and J221 on the DC controller PCB. If
3.The main motor is defective.
Action: Use the printer driver tester to rotate the main motor. If it does not rotate, replace it.
4.The DC controller PCB is defective. Action: Replace the DC controller PCB.
<Possible causes>
1.The FM3 drive signal line connector is loose.
Action: Reconnect connector J210 on the DC controller PCB and connectors J12 and J13.
2.The electrical unit fan is defective.
Action: Disconnect connector J210 on the DC controller PCB. Turn the power switch ON and measure the voltage between connector
3.The DC controller PCB is defective. Action: Replace the DC controller PCB.
<Possible causes>
1. The FM2 drive signal line connector is loose.
Action: Reconnect connector J216 on the DC controller PCB.
2. The power supply fan is defective.
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