HP LaserJet Pro 400 Service Manual - Page 185
Fan Error, Turn off then on, 79 Error Turn off then on, Black Cartridge Low
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Recommended action Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the product to initialize. If a surge protector is being used, remove it. Connect the product directly into the wall socket. Use the power switch to turn the product on. If the error persists, contact HP. See www.hp.com/go/LJColorMFPM375 or www.hp.com/go/ LJColorMFPM475 or the support flyer that came in the product box. 57 Fan Error, Turn off then on Description The product has experienced a problem with its internal fan. Recommended action Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the product to initialize. If the error persists, contact HP. See www.hp.com/go/LJColorMFPM375 or www.hp.com/go/ LJColorMFPM475 or the support flyer that came in the product box. 79 Error Turn off then on Description The product has experienced an internal firmware error. Under most conditions, the product automatically restarts. Recommended action Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the product to initialize. If a surge protector is being used, remove it. Connect the product directly into the wall socket. Use the power switch to turn the product on. If the error persists, contact HP. See www.hp.com/go/LJColorMFPM375 or www.hp.com/go/ LJColorMFPM475 or the support flyer that came in the product box. Black Cartridge Low Description The toner cartridge is nearing the end of its useful life. Recommended action Printing can continue, but consider having a replacement supply on hand. ENWW Troubleshooting tools 159