Oki ColorPainter E-64s - Manual (Page 71)

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 I want to heat the heaters before I start printing (CP_Manager setting)
Set the printer to the online state, then start CP_Manager on the computer.
Select the Heater Settings tab and set the temperature for each heater.
Select Always and click Update at the bottom right.
The printer will raise the temperature immediately, and after it reaches the set temperature, it will continue to
maintain that temperature.
* Heater temperature operations are also possible on the printer panel.