HP Color LaserJet Enterprise M750
Troubleshooting. Engine test button
- Turn the product on.
- Use a fine-point tool, (for example a precision-slotted screwdriver with a 1 mm (0.04 in) blade width) to press the engine test button.
NOTE:
Access the engine test button through a hole in the rear cover. - An engine test page (lines in each of the print cartridge colors) prints.