¶ Issue Phenomenon:
When connecting the AMS to the X1 series printer, the LEDs in all four slots were blinking red(If the AMS firmware version is too old, white lights may be blinking). Inserting the filament into the AMS, the AMS preloads (feeds the filament forward and then pulls back), but there is no AMS tab on the printer screen.
¶ Operational guide
First please TURN OFF the printer, and then follow the steps below to troubleshoot.
¶ 1. Pin check
Check whether the Pins of the Bambu Bus 4Pin&6Pin cable (cables connecting AMS—buffer—printer) are open as below:
¶ 2. Connection check
- Check if the bus cable inside the AMS is loose:
- It is recommended to shake or bend the 4Pin and 6Pin plugs and cable slightly, or pull out the plugs a little bit (do not pull them out completely) to see if the AMS can be detected for a short time so that we can narrow the fault to the plug/cable;
¶ 3. Measure the resistance values
If you have a multimeter, make sure the 4Pin and 6Pin cables are connected properly, then use the multimeter to measure the resistance of the AMS, the printer, and the 4Pin and 6Pin cables(please keep the printer off).
The normal resistance should be(only one AMS is connected):
| pin-pin | AMS/printer port | 4/6pin cables connect the buffer | 4/6pin cables connect the AMS Hub |
| GND-sigA | 4~5kΩ | 4~5kΩ | 2~2.5kΩ |
| GND-sigB | 4~5kΩ | 4~5kΩ | 2~2.5kΩ |
| sigA-sigB | 8~10kΩ | 8~10kΩ | 4~5kΩ |
- First, disconnect the 4Pin cable from the printer and measure the resistance of the printer's 4Pin interface and 4Pin cable, as shown below.
- Then connect the 4Pin cable back to the printer, unplug the 4P cable from the buffer, and continue to measure the resistance of the 4Pin cable at the other end (removing the buffer from the printer makes it easier to unplug the cable).
- Next, connect the 4Pin cable back to the buffer, unplug the 6Pin cable from the AMS, and measure the resistance of the AMS 6Pin port (both ports are the same) and the 6Pin cable.
- Finally, unplug the 6Pin cable from the buffer and measure the resistance at the other end of the 6Pin cable (removing the buffer from the printer makes it easier to unplug the cable).
If an abnormal resistance value is measured in the above steps, you can determine where in the AMS/printer/4&6pin cable/buffer the fault is causing the AMS to be undetectable.
- If the resistance of the AMS 6pin port is abnormal, you can disassemble AMS (please refer to this wiki) and further measure the resistance of the pins of the Bus and power cables connected to the mainboard to see whether the mainboard is faulty:
- If the measured resistance of the printer's 4pin port is abnormal, it may be the fault of the AMS interface board or the MC board. You can remove the back cover of the printer, unplug the 6pin cable from the AMS interface board (please refer to this wiki), and measure the resistance of the 6pin cable connected to the MC board to see whether the MC board is faulty:
- There are a total of 8 sets of resistance value data above, as shown in the following figure. If the measured resistance value of any part is abnormal, it indicates that this part is faulty. Please measure and record them with reference to the following picture, and then contact the customer support team for assistance.
