When you Power On the Printer, the Printer performs the Boot-Up sequence which initializes the major components of the Printer. If for some reason the Boot-Up sequence fails because a component has failed to initialize, the following explanations will help you to locate the failing component:

Entering Service Menu at Power Up - Only for Onsite Repair
If the Printer fails to initialize completely because of a System Error and you need to use the Service Menu (Service Tests and Utilities), the Printer can be powered up in Service Mode by pressing the Up and Enter keys while switching the Printer ON. This will give you access to some of the Service Tests and Utilities without having to complete the System Initialization (if you perform some of the tests, they will need to initialize the relevant part of the System).

In certain circumstances the LEDs located in the Formatter or HP-GL/2 Accessory Card can help to highlight certain failures. There are 3 LEDs, Red, Yellow and Green and using different combinations can indicate different problems.

The yellow LED (normally flashing) indicates that the Formatter/Accessory Card is alive. If it stops flashing, it means that the Formatter/Accessory Card has failed and should be replaced.

The green LED indicates that there is power being supplied to the Formatter/Accessory Card. If the green LED is NOT lit and the LED in the Power Switch is ON, then it could mean that the Formatter/Accessory Card is badly connected or that the Printer if switched OFF. If after reseating the Formatter/Accessory Card, the problem persists, try the following:

1. Switch the Printer OFF and remove the Formatter/Accessory Card BUT leaving the LAN Card installed (if available). Switch the Printer ON. If the Printer powers up correctly and the LAN Card works properly, then try step 2. If the LAN Card doesn't work, then try step 3.

2. Switch the Printer OFF and remove the LAN Card from the current slot and install the Formatter/Accessory Card in the same slot (that was previously used by the LAN Card). Switch the Printer ON and check if the green LED in the Formatter/Accessory Card is lit. If the green LED is NOT lit, it means that the Formatter/Accessory Card is faulty and should be replaced.

If the green LED is lit, then switch the Printer OFF and install the LAN Card in the vacant slot. Switch ON the Printer and check if the LAN Card works properly. If the LAN Card does NOT work, then there is a problem with the Electronics Module and should be replaced » Electronics Module.

3. Switch the Printer OFF and remove the LAN Card. Switch ON the Printer and check if it initializes completely. If it initializes correctly without any problems, then the problem could be with the Electronics Module and should be replaced » Electronics Module.

4. If the Printer does not even start to power up (i.e. nothing seen on the Front Panel and the LED in the Power Switch is NOT flashing) without the LAN Card nor the Formatter/Accessory Card, but the power switch LED is ON (all the time) the problem could be with the Electronics Module or the Power Supply Unit.

The red LED will flash a few times when the Printer is started up but if it stays lit (all the time) or flashes continuously, then this indicates that the Formatter/Accessory Card is faulty and should be replaced