Konica Minolta IP-423 Service Manual page 48

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Chapter 3 Field Service
4.
Click [Port Settings] to check to see that the followings are selected:
Check that the "Spool MS-DOS print jobs" and "Check port state before printing" checkboxes are
selected.
5.
Click [Apply] in the PCL Properties window, and then click [OK].
3-6
Caution
When the ECP mode is not selected, it is possible that the PC may not support
the ECP mode or that ECP may not be selected in the BIOS settings.
If the PC supports the ECP mode, set the parallel port to the [ECP] mode in the
BIOS settings.
How to set the BIOS settings differs from PC to PC.