Hello together, had to change the charge controller with a scooter Explorer HI-50 (equivalent to Kallio) because there were sporadic failures (light, charging voltage) (Lima is ok – i.e. 12-45V at both circles). Short research with the relevant two-wheel online dealers led to a (apparently) suitable controller: . At the first start after the exchange, however, the problems appeared: At the moment I am on the troubleshooting and have also examined the speedometer: Q1 and parts of the Plati The large transistor J127G has a short circuit (collector after emitter 0Ohm, no matter which direction of current). I can not reconstruct the conductor tracks or have an idea which transistor type was installed here. In return, I can upload the reconstructed circuit diagram here…. Thank you for your help, Dirk