Lexmark 2380 - Forms Printer B/W Dot-matrix Service Manual page 46

FRU/Symptom
4 If the prior
suggestions have
not corrected the
problem.
5 Problem occurs
only in specific
customer
applications.
2-22
Action
The service check has not defined the failure,
or the machine is having intermittent failures.
The following may cause undefined or
intermittent failures:
1. Customer's outlet voltage. Be sure that it
is within the tolerance.
2. Loose connector pins or keys that fail to
contact.
Check the following:
a.Reconnect the connectors of all FRUs
and printer interface cables.
b.Check the continuity of the line cord.
3. Electrical noise.
Check the following:
a. Power supply ground.
b. Machine frame ground.
c. Printer interface cable is grounded
or shielded.
4. Undefined data in customer applications.
Check the baud rate at the controller. Check
that the printer interface cable matches the
printer.
Perform the Trace Print (hexadecimal printing)
by the following procedure and check the data
streams.
1. Turn the power off.
2. Turn the power on while pressing and
holding Alt.
3. Have the customer print the failing job.
4. To stop printing, turn the power switch off.
If the failure still occurs, replace the main logic
board. Be sure to reset the bidirectional print
adjustment, refer to the "Bidirectional Print
Adjustment" on page 4-5.