Lexmark WinWriter 150c Service Manual - Page 23

Parallel Port Service Check, Power Service Check, Parallel Port Test

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4077-001 Parallel Port Service Check FRU 1 Parallel Port 2 Communications Jumper Action Run a test page to be sure the printer can print. Run the "Parallel Port Test" on page 20. If the test fails, replace the system board. If the parallel cable has been replaced and there is still a communications problem, move the communications jumper to pins 2 and 3. Power Service Check FRU 1 Power Supply 3 Printhead Cable Parallel Cable Encoder Card 4 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 machine 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. Diagnostic Information 14

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Diagnostic Information
14
4077-001
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 20
. If the
test fails, replace the system board.
2
Communications
Jumper
If the parallel cable has been replaced and there is
still a communications problem, move the
communications jumper to pins 2 and 3.
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 machine
before you reconnect the power supply to the
system board.
3
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.
4
System Board
If the symptom has not changed, replace the
system board.