L2 - R4.6 Microcontroller Communication Error (System Freezing)

STEP 1 - Reboot the machine, and verify the FW version.

• Result 1 - FW version is displayed.
  Start STEP 4. (Root cause: temporary MCU disconnected. Need PSE to check if further research is required or not.)
  
  
• Result 2 - FW version is empty.     
  Start STEP 2.
  

STEP 2 - Reconnect the USB Type-C cable between the control board & Tinker board, then reboot (Press the reset button for 10 secs) and verify the FW version.

• Result 1 - FW version is displayed.
  Start STEP 4. (Root cause: USB cable disconnected)
  
  
• Result 2 - FW version is still empty.  
  Start STEP 3.

STEP 3 - Replace the control board (see SOP here). Contact PSE for the software update. Power on the machine to perform the software update, then verify the firmware version.

• Result 1 - FW version is displayed.
  Start STEP 4. (Root cause: Control board failure)
  
  
• Result 2 - FW version is still empty.  
  Escalate to PSE. 

STEP 4 - Go to the “Control” page, and verify the functionality for every item. Then make a few drinks (covering all the ingredients) and verify the tastes. 

• Result 1 - All the functionalities (except for “Cold hot water valve”) & drink tastes meet the standard.
  Issue closed.
  
  
• Result 2 - Any functionality is in issue.
  Start the corresponding component troubleshooting process.

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