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25XX-100, -110
FRU/Symptom
4
The previous
suggestions have
not corrected the
problem.
5
Problem occurs
only in specific
user applications.
2-22
Service Manual
Action
The following may cause undefined or
intermittent failures:
• Loose connector pins that fail to contact.
Check the following:
— Reconnect the connectors of all
FRUs and printer interface cables.
—
Check t
cord.
• Electrical noise.
Check the following:
— Power supply ground
— Printer frame ground
—
Printer interface cable is grounded
or shielded
• 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 performing the following
procedure, and check the data streams. Go to
"Hex Trace mode" on page
• Turn the printer off.
• Press and hold Tractor, and turn the printer
on.
• Have the user print the failing job.
• 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
he continuity of the line
.
3-4.
"Bidirectional print
4-4.
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