Lexmark 3000 Color Jetprinter Service Manual - Page 23

Power Service Check, Diagnostic Information 2-11

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Power Service Check FRU 1 Power Supply Action Disconnect CN9 from the system board and check the following voltages on the power supply cable: • CN9-1 to GND = +5 V dc • CN9-3 to GND = + 24 V dc If you do not have correct voltage, replace the power supply. Be sure to unplug the machine before you reconnect the power supply to the system board. 2 Printhead Cable Unplug the printer. Disconnect one of the Carrier Home printhead cables and plug in the printer. Look for a Sensor symptom change. Check the failing part for shorts Parallel Cable and replace as necessary. Paper Feed Motor Carrier Transport Repeat this procedure for the carrier home sensor, Motor parallel cable, carrier transport motor and paper feed motor. 3 System Board If the symptom has not changed, replace the system board. Diagnostic Information 2-11

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Diagnostic Information 2-11
Power Service Check
FRU
Action
1
Power Supply
Disconnect CN9 from the system board and check
the following voltages on the power supply cable:
•
CN9-1 to GND = +5 V dc
•
CN9-3 to GND = + 24 V dc
If you do not have correct voltage, replace the
power supply. Be sure to unplug the machine
before you reconnect the power supply to the
system board.
2
Printhead Cable
Carrier Home
Sensor
Parallel Cable
Paper Feed Motor
Carrier Transport
Motor
Unplug the printer. Disconnect one of the
printhead cables and plug in the printer. Look for a
symptom change. Check the failing part for shorts
and replace as necessary.
Repeat this procedure for the carrier home sensor,
parallel cable, carrier transport motor and paper
feed motor.
3
System Board
If the symptom has not changed, replace the
system board.