Lexmark 2030, Service Manual

Page: 19 / 51

Diagnostic Information 2-9
4091-001
Power Service Check
FRU Action
1 External Power
Supply Disconnect the power supply from the DC/DC
converter. Plug the external power supply into an
outlet. Check for + 24 V dc. If you do not have
correct voltage, replace the external power supply.
2 DC/DC Converter Disconnect CN8 from the system board and check
the following voltages on the DC/DC Converter
cable:
• CN8-2 to GND = +24 V dc
• CN8-4 to GND = + 5 V dc
If you do not have correct voltage, replace the
DC/DC Converter. Be sure to unplug the machine
before you reconnect the DC/DC Converter to the
system board.
3 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.
4 System Board If the symptom has not changed, replace the
system board.