Power Service Check - Lexmark 3000 Color Jetprinter Service Manual

Power Service Check

FRU
1 Power Supply
2 Printhead Cable
Carrier Home
Sensor
Parallel Cable
Paper Feed Motor
Carrier Transport
Motor
3 System Board
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.
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.
If the symptom has not changed, replace the
system board.
Diagnostic Information 2-11