HP LaserJet Pro M435nw MFP

The section describes the tools that can help you solve problems with your product.

Engine self-test

1. Make sure that paper is correctly loaded in the tray.
2. Turn the product off, wait for several seconds, and then turn the product on. Wait for the product to reach the ready state.
3. Open, and then close the print-cartridge door five times within thirty seconds to start the internal engine-test.
4. If the self-test page prints, the product passes the engine self-test. If the self-test page doesn’t print, the product fails the engine self-test.

NOTE:
The product might display a 49 error during the engine test. A 49 error that occurs during an engine test has no relation to the success or failure of the engine test. To clear a 49 error, turn the product off, then on.

Troubleshooting process for product not turning on

Use the following steps to troubleshoot the product not turning on when the power button is pressed.

1. Before beginning this troubleshooting process, verify the following:
   • The product is being supplied with normal AC voltage
   • The product's AC power cord is connected to the product and plugged in to a power source
   • All internal power cables and wire harnesses are connected securely
2. Replace the engine flat flexible cable, and then press the power button. If the product does not turn on, proceed to step three.
3. Replace the control panel assembly, and then press the power button. If the product does not turn on, proceed to step four.
4. Replace the formatter PCA, and then press the power button. If the product does not turn on, the engine is defective and must be replaced.