E621:Communication error between main control board and sorter
- Definition - [B]
The main CPU cannot start communication with the sorter properly.
- Possible Causes -
• Poor connection between the main control board and the sorter
• Main control board defective
• Sorter main board defective
E623: Communication error between main control board and paper tray unit
- Definition - [C]
The main CPU cannot start communication with the paper tray unit properly.
- Possible Causes -
• Poor connection between the main control board and the paper tray unit
• Main control board defective
• Paper tray unit interface board defective
E720 - Timing Sensor (Roller Drive) Output Error (A554/A555)
- Definition - [B]
When the roller drive/transport motor is turning, the timing sensor takes
over 500 ms to change.
- Possible Causes -
• The timing sensor is defective.
• The rroller drive/transport motor is defective.
• The main control board is defective.
E721 - Timing Sensor (Bin Lift) Output Error (A554/A555)
- Definition - [C]
When the bin lift/bin drive motor is turning, the timing sensor takes over
250 ms to change.
- Possible Causes -
• The timing sensor is defective.
• The bin lift/bin drive motor is defective.
• The main control board is defective.
FT5535/4527/4522 6-40 FSM
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