Konica-Minolta bizhub 28e
Troubleshooting. Machine malfunction. The LCD shows Please close the flashing cover
| What to confirm | Yes | No |
|---|---|---|
| 1. If you close the flashing cover, the symptom will be fixed. | Solved. | Check No.2. |
| 2. Is the cover secured firmly by screws? | Check No.3. | Secure the cover properly. |
| 3. Is the message shown after energy save mode is released? | Check No.4. | Check No.5. |
| 4. Does the main control board P21-1 have +24V output? | Check No.5. | Check No.6. |
| 5. Press the sensor in the message and check the output changes to +3.3V through GND. (The interlock and JAMC +24V through GND.) ADF cover : ADF control board P3-8 Interlock and JAMC : Main control board P21-2 |
Check No.6. Check No.7. |
|
| 6. If you replace ADF board or the connecting harness, the message will disappear | Replace the circuit board or the harness. | Check No.7. |
| 7. If you replace the main control board, the symptom will be fixed. | Replace the main control board. | Replace the machine. |