Epson AcuLaser C4000 Reference Manual page 59

Note:
1200-dpi printing is available only when the emulation mode is
ESC/Page, ESC/Page Color or PS3.
When you want to set the print quality to 1200-dpi, click the
Advanced button in the Basic Settings menu, then set the print
quality setting to 1200 dpi in the More Settings dialog box.
1. Click the Basic Settings tab.
2. Click the Automatic button. Then choose desired printing
resolution from Fast (300 dpi) or Fine (600 dpi) with the slider
bar.
3. Click OK to accept the setting.
Using the Printer Software with Windows
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