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480/600 Switchable Printers

If your printer has a 480/600 DPI switchable printhead, you will need operator instructions on when and how to switch between the two different resolutions. If all your jobs are developed at a single DPI, for example 240 DPI, you should keep the printer at 480 DPI resolution all the time for optimum performance and print quality. However, if you have some jobs for 240 DPI and some for 300 DPI, you will need to have some way of separating the jobs by resolution and of notifying the operator when to change the resolution on the printer. This change is done from the printer console by selecting the CONFIGURE PRINTER option for Printhead Resolution. The printer normally takes less than 1 minute to complete this operation.

In 480 DPI resolution, the printer reports to PSF that it is a 240 DPI printer. It accepts 240 DPI raster fonts and automatically scales them to 480 DPI. From an operational and application standpoint, it is no different than a 240 DPI printer.

Note that there are no 480 DPI raster fonts supplied by IBM, nor does IBM recommend that you create or use 480 DPI raster fonts. You should use only 240 DPI raster fonts or outline fonts with 480 DPI printhead resolution. For printers with 480/600 switchable printheads, jobs that use 240 DPI raster fonts should be printed with the 480 DPI printhead, rather than with the 600 DPI printhead. Because scaling 240 to 480 DPI is a simple matter of scaling the dots, both appearance and performance of 240 DPI jobs may be better at 480 DPI resolution than at 600 DPI.

If your PSF is PSF/MVS 2.2 with APAR OW27622 for Multiple Resolution support, you can set up the PSF printer definition so that the font libraries switch automatically when the printer resolution is changed. See the APAR documentation for details.

When your printer is in 600 DPI mode, you have an additional capability: the option to specify IPDS Resolution mode.