HP color laserjet 2550 series Manuale Di Servizio

3. Turn the printer on and continue to hold   (Go) for at least 20 seconds, but fewer than

30 seconds.

The Attention and Ready lights turn on during the continuous self-test.

4. Release   (Go). The device lights begin cycling from front to back. The self-test

process runs until the printer is in the Ready state.

This test is similar to the NVRAM initializer; for more information see 

.

5. To terminate the continuous self-test, press   (Cancel Job).

The high-voltage power-supply PCA provides the necessary voltages for the
electrophotographic processes.

1. Turn the print cartridge over and visually inspect the two connection points on the ends

of the print cartridge. If they are dirty or corroded, clean the connections. If they are
damaged, replace the print cartridge.

2. If the connection points are dirty or corroded, then clean the connections. If they are

damaged, then replace the print cartridge.

Use only isopropyl alcohol to clean the connections.

If media is not being picked up or is not moving through the paper path, you might want to
observe all of the paper-motion activities. Override the door interlock (SW301) and the laser/
scanner switch to observe the following actions:

●

Motor rotation

●

Solenoid action

●

Pickup-roller motion

●

Drive-roller, transfer-roller, fuser-roller and gear, and delivery-roller motion

1. Push a piece of heavy paper into the slot in the top cover (callout 1) to override SW301.

ENWW

Functional checks