How to find defective components

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Messen.jpg

Here are examples on how to find defective components on your PCB1.3.

Problem: Battery does not charge.

Solution:

  1. Remove charging relay K3.
  2. Connect charger, ensure charger cable (-/GND) is connected to the side marked as '-' at the PCB P42 connector and charger cable (+) is connected to the side marked as '+' at the PCB P42 connector.
  3. Ensure the yellow station LED near charging relay is going ON.
  4. Using a multimeter (volt/DC) measure voltage directly at charger connector P42 (- and +), ensure charger voltage at P42 is approx. 29V.
  5. Measure voltage between charger P42 GND and left and right side of the fuse EF1. It should again have approx. 29V.
  6. Disconnect charger.
  7. Insert charging relay K3.
  8. Connect charger again.
  9. Measure voltage between P42 GND and Arduino 'pinChargeRelay' (pin 50, see Arduino pinout below). It should have 3.3V which means the Arduino controls the charging relay to go ON.
  10. Ensure the charging relay is going ON (makes a hearable clicking noise when charger is connected).

Measure faulty1.png

Arduino due.jpg

To be continued...

Good luck with your measurements!

PS: You can find the complete PCB1.3 schematics here: https://github.com/Ardumower/ardumower/tree/master/Dokumentation/Megashield%20SVN%20V1.3

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