Service Manual
6-3
Troubleshooting
6
Print engine troubleshooting
This topic is a step-by-step procedure for systematically verifying particular
aspects of a printer's operation. Following this procedure should lead to the
cause of a printer's failure.
Verifying image processor operation
1.
If the printer does not power up, or does not initialize, or the printer
initializes but the motors do not run properly, go to the later topic,
“Verifying power supply operation” on page 6-4.
2.
Observe that the
Ready
message is displayed on the front panel. If it
does not, go to the later topic, “Verifying power supply operation” on
page 6-4.
3.
Verify that the image processor’s health LED is flashing. If it is not,
replace the image processor board.
4.
Turn off the printer. Attach a PC running PC-based diagnostics to the
printers serial port; refer to the later topic “PC-based diagnostics” on
page 6-26. Turn on the printer.
5.
Select the menu test
System Verify — Test Print
.
6.
After the print is made, remove the PC.
If the printer prints a test pattern, then the printer's image processor board and
print engine are working correctly. The printer's problem resides with the host
computer-to-printer connection, or the host computer. Refer to the appropriate
topics in Chapter 3, “Verifying the Printer and Host Connections.” (Note that
since the PC diagnostics operates only through the service serial port, the
possibility also exists that the hardware of any of the other hosts interface ports
could be non-functioning, and could be the source of the print failure. In this
case, the printer should be able to print from another port, except the
non-functioning port.)
If the printer does not print a test pattern, then a problem exists with the
printer's image processor board or the print engine. Proceed with the next topic,
“Verifying print engine operation by using its test print” on page 6-4.
