Tools for troubleshooting
Engine diagnostics
Engine test button
1. Turn the product on.
2. 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 right-side cover.
3. An engine test page (horizontal lines in each of the toner cartridge colors) prints.
Figure 2-1 Engine test button location
Diagrams
Plug/jack locations
1 Network port (HP LaserJet Pro 300 color M351a, HP LaserJet Pro 300 color M351dw, and HP LaserJet Pro 300 color
M351dn models only)
2 Hi-Speed USB 2.0 port
106 Chapter 2 Solve problems ENWW
For mor information on LaserJet Pro 300, Pro 400 go to www.printersupplies.com
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