Lexmark Forms Printer 2400 Service Manual page 38

24xx
FRU/Symptom
4 If the prior
suggestions have
not corrected the
problem.
5 Problem occurs
only in specific
user applications.
2-20
Service Manual
Action
The following may cause undefined or
intermittent failures:
1.Loose connector pins that fail to contact.
Check the following:
• Reconnect the connectors of all FRUs and
printer interface cables.
• Check the continuity of the line cord.
2.Electrical noise. Check the following:
• Power supply ground.
• Printer frame ground.
• Printer interface cable is grounded or
shielded.
3.Undefined data in user applications. Check
the baud rate at the controller. Check that the
printer interface cable matches the printer.
Perform the Hex Trace Print (hexadecimal
printing) by the following procedure and check
the data streams. Go to
page 3-4.
1. Turn the printer off.
2. Press and hold Tractor and turn the printer
on.
3. Have the user print the failing job.
4. To stop printing, turn the power off.
If the failure still occurs, replace the logic
board. Be sure to reset the bidirectional print
adjustment. See
Adjustment" on page
"Hex Trace Mode" on
"Bidirectional Print
4-4.