Oki ML5721 User Manual page 63

PROBLEM
Print position offset
The horizontal printing
position is offset.
Printing slows down
Print direction changes
suddenly to unidirectional.
PE warning
The print carriage does not
operate.
Print blurring
The characters are too pale to
display properly on the paper.
A line of print is missing.
The printout differs from the screen display.
Printout of completely
different characters or
symbols.
CAUSE
The start position may
change after the printer is
powered on.
When the print head
overheats, the printer
automatically starts
unidirectional split printing.
There is contamination on the
carriage shaft.
The Paper Thickness lever
position does not match the
paper.
The printer is set to print at
high speed.
The ribbon has reached its
end of life.
The ribbon cartridge is not
installed correctly.
The ribbon has been wound
incorrectly.
The ribbon is not transferring
properly.
Broken wire pins.
Incorrect print setup for the
user application.
The application control codes
for the previous print
operation are still enabled.
The input application control
signal is not correct.
The interface cable is not
properly connected.
Troubleshooting > 63
ACTION
When the printer is powered
ON, switch from off -line mode
to on-line mode by pressing
the SEL button. Reset the
start position. You must set
the Power Switch to OFF
before you change the start
position.
When the print head
temperature drops
sufficiently, the printer will
return to its original
operation.
Clean any paper dust and
contamination from the
carriage with a dry cloth.
Correct the Paper Thickness
lever setting.
Set the speed to normal.
Replace the ribbon by a new
one.
Reinstall the ribbon cartridge
correctly.
Replace the ribbon cartridge
by a new one.
Replace the ribbon cartridge
by a new one.
Contact your dealer.
Reselect print setup for the
applications according to
priority.
Initialise the printer.
Print in hex dump mode and
verify the data content. Make
corrections in the application.
Reconnect the cable correctly.