If the encoder card (A, Fig. 5) does not read, check: - the connection flat; - that the sensor is correctly mounted in its seat; - that the micro-switch cable is correctly connected; If these checks do not rectify the problem, replace the encoder card (A, Fig. 5) as follows: - remove the weight tray; - remove the encoder cover plate (C, Fig.5), unscrewing the three fixing screws (D, Fig.5); - remove the encoder card from the support, unscrewing the two fixing screws (E, Fig.5); - disconnect the flat then replace the sensor and proceed with the assembly by following the disassembly directions in the reverse order; - check the sensor reads correctly, as indicated above; - after replacing the board, perform the internal sensor calibration as described in the paragraph “Internal sensor calibration”. Note: if the value of the diameter is incorrect, check: - that the internal hexagonal rod (F, Fig. 5) has