24V - Comes from the PSU after a fuse on the PrintMech PCA. Troubleshooting VPOWER2 - Comes from the PSU (42V) after a fuse on the Interconnect PCA. Used to power the Carriage PCA. Should be ON at the same time as Green Power Switch LED. PrintMech PCA The following illustration shows the locations of the LEDs on the PrintMech PCA. DS7: 5Vsb DS5: VAUX=12V DS4: 24V DS3: VPOWER2 PrintMech PCA DS2: 5V DS1: 3V3 5Vsb - Comes from the PSU after the fuse on PrintMech PCA. 3V3 - Comes from the Power Supply Unit. 5V - Comes from the Power Supply Unit. VPOWER2 - Comes from the PSU (42V) after a fuse on the PrintMech PCA. VAUX - Comes from the PSU (12V) after a fuse on the PrintMech.
Identifying faults from LED status Use the following procedure to identify faults from the status of the LEDs. 1. If the Printer cannot be turned ON: Signal LED on Interconnect PCA LED on PrintMech PCA Power Switch LED Corrective Action • Check the connection between the PSU and the Interconnect PCA. • If connection OK, replace the Interconnect PCA ⇒ See page 357. 5Vsb OFF ON 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 con- nected correctly. 5Vsb ON OFF Amber Using the PCA LEDs to Troubleshoot 17