Xerox 1235/DX Service Guide - Page 60

Front door indicated being open when it is closed 1. Inspect that the front door's interlock for damage. 2. Replace the interlock switch. 3. Check its wiring harness. 4. Replace the engine controller board. 5. Replace the power supply. High temperature error 1. Check the fans for proper operation. 2. Replace the low-voltage power supply unit. 3. Replace the engine controller board. Low temperature error If the fuser is cold, 4. Ensure the fuser unit is properly installed. 5. Check the fuser unit's connection and wiring. 6. Replace the fuser unit. 7. Replace the low-voltage power supply. 8. Replace the engine controller board. If the fuser is hot, 1. Replace the fuser 2. Replace the engine controller board Invalid memory DIMM 1. Upon power-up, the system controller board checks each DIMM for information such as data width, clock delay, number of address columns and row, refresh rate and more. If the DIMM does not meets the required specifications the printer displays an "Invalid memory DIMM" error message and then continues the bootup process. Service Guide 47