HP LaserJet M570dn Pro 500 Color MFP
Troubleshooting. Engine diagnostics
Engine test
The engine test produces a single-sided sheet with horizontal lines when you perform the engine test.
To perform the test, use a small-pointed object, for example a straightened paper clip, to push the engine test button (accessed through a small hole in the rear cover). If the engine is functioning properly, the product will initialize and then print the test page.
