On the printer, go to Menu Mode and change the setting for Printhead Gap Adjust under the Group Setup.
The default setting is 0. If the printing is lighter, change the setting to-1; if it's darker, change it to +1.
So in this case, if it is 0, set it to -1.
Normally the Gap is set automatically by the printer, when powered On. It moves the printhead back and forth, and senses the paper thickness and sets the gap value accordingly.
If that doesn't help, the printer may either need the printhead replaced, or need servicing or replacement of the whole printer.
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