Troubleshooting 1 If the Printer cannot be turned ON: 2 If the Printer starts (after having pressed the ON button on the Front Panel) but the front Panel remains black: hp designjet 4000 series printer service manual 1-15 Signal LED on Interconnect PCA LED on PrintMech PCA Power Switch LED Corrective Action 5Vsb OFF ON Amber Check the connection between the PSU and the Interconnect PCA. If connection OK, replace the Interconnect PCA ⇒ Page 8-64. 5Vsb ON OFF Amber Check the connection between the PSU and the PrintMech PCA. Make sure that ALL cables between the PSU and PrintMech are not damaged and are connected correctly.
5Vsb OFF OFF Amber or no LED Check the connection between the PSU and the PrintMech PCA and Interconnect PCA. If connection OK, check that power reaches the PSU (check the power outlet). If power reaches PSU, replace the PSU ⇒ Page 8-78. Signal LED on Interconnect PCA LED on PrintMech PCA Power Switch LED Corrective Action 5V OFF ON Blue Check the connection between the PSU and the Interconnect PCA. If connection OK, replace the Interconnect PCA ⇒ Page 8-64. 5V ON ON Blue Check the connection between the Front Panel and the Interconnect PCA. If connection OK, replace the Interconnect PCA ⇒ Page 8-84 and the Front Panel ⇒ Page 8-20.