The stapling is enabled in all drawers. Otherwise, photocopying would NOT staple, but YES staple.
In all drawers it is indicated as normal paper of 80gr. with option of stapled and double-sided active.
The machine as soon as it receives the printing order (although this is the selected option to staple) it performs the work with total normality without indicating ANYTHING per screen, and WITHOUT STAPLING.
Obviously something happens here that is foreign to the driver and must be something internal to the device.
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