Troubleshooting the Interconnect Cable. Try the following: 1 Check that the Interconnect Cable is connected correctly to the Electronics Module and to the Interconnect PCA. 2 If the Interconnect cable is connected correctly and the LED continues to flash twice then replace the Interconnect Cable ⇒ Page 8-59 . LED Flashes 3 times every few seconds - The Printer cannot detect the Front Panel. Try the following: 1 Check that the Front Panel is connected correctly to the Interconnect PCA. 2 Check that the Interconnect Cable is properly connected at the both ends of the Printer.
3 If the Front Panel is connected correctly and the LED continues to flash 3 times then replace the Front Panel ⇒ Page 8-9 . 4 R eplace the Interconnect Cable ⇒ Page 8-59 . 5 Replace the Electronics Module ⇒ Page 8-24 . LED Flashes 4 times every few seconds - This indicates that the Main PCA has failed. Replace the Electronics Module ⇒ Page 8-24 . LED Flashes 5 times every few seconds - This indicates that the Main PCA has failed. Replace the Electronics Module ⇒ Page 8-24 . 1-11 HP DesignJets 500 and 800 Series Printers Service Manual