HP C7769B Service Manual - Page 21
LED Flashes 3 times every few seconds, RHP DesignJets 500 and 800 Series Printers Service Manual
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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 Replace 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. HP DesignJets 500 and 800 Series Printers Service Manual 1-11