Lexmark 2050 Color Jetprinter Service Manual - Page 22

Parallel Port Service Check, Power Service Check, Encoder Card

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Parallel Port Service Check FRU 1 Parallel Port Action Run a test page to be sure the printer can print. Run the 'Parallel Port Test' on page 3-3. If the test fails, replace the system board. Power Service Check FRU 1 Power Supply 2 Printhead Cable Parallel Cable Encoder Card 3 System Board Action Disconnect J11 from the system board and check the following voltages on the power supply cable: • J11-1 to GND = +5 V dc • J11-3 to GND = +24 V dc If you do not have correct voltage, replace the power supply. Be sure to unplug the printer before you reconnect the power supply to the system board. Turn off the printer. Disconnect one of the printhead cables and turn on the printer. Look for a symptom change. Check the failing part for shorts and replace as necessary. Repeat this procedure for the parallel cable and the encoder card. If the symptom has not changed, replace the system board. 2-12

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2-12
Parallel Port Service Check
Power Service Check
FRU
Action
1
Parallel Port
Run a test page to be sure the printer can print.
Run the
’Parallel Port Test’ on page 3-3
. If the test
fails, replace the system board.
FRU
Action
1
Power Supply
Disconnect J11 from the system board and check
the following voltages on the power supply cable:
•
J11-1 to GND = +5 V dc
•
J11-3 to GND = +24 V dc
If you do not have correct voltage, replace the
power supply. Be sure to unplug the printer before
you reconnect the power supply to the system
board.
2
Printhead Cable
Parallel Cable
Encoder Card
Turn off the printer. Disconnect one of the
printhead cables and turn on the printer. Look for a
symptom change. Check the failing part for shorts
and replace as necessary. Repeat this procedure
for the parallel cable and the encoder card.
3
System Board
If the symptom has not changed, replace the
system board.