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Cadence sensor dead after changing battery

Former Member
Former Member over 7 years ago
Put in a new battery and now won't work at all. Speed sensor is fine after battery change. Checked with a different battery, nothing. Did the flip battery and left open just in case this would work. The white card fell out - does it have to put back in a specific position?
  • 0 over 4 years ago in reply to 1654070

    This was helpful thanks. I’ve been struggling for ages with this darn thing. 

  • 0 over 4 years ago

    adjusting the bronze connector inside the sensor with a paper clip worked for me. Thanks! 

  • 0 over 4 years ago

    Use a small precision screwdriver to prise up the smaller rectangular shaped connector. Tried three times before the sensor would reconnect with the head device.  Thanks to BLee for the tip. 

  • 0 over 3 years ago in reply to LRPFEIL

    Awesome! It worked!!!

  • 0 over 2 years ago

    This video saved me.  My white card fell out too, and I placed back in the wrong position.  This video shows where to reposition the card so contact is made with the positive terminal.  www.youtube.com/.../eXLsG9ZzRiQ

  • 0 over 2 years ago

    Same problem with my CS 1, died after battery change, tried different batteries, pried up the tabs, nada, almost bought a new one.  There are two tabbs; one in the center of the base and one small one on the edge.  I pried up the small brass tab (way up!) and it worked!  Cadence sensor is working fine.  

  • Former Member
    0 Former Member over 2 years ago

    If the white card fell out, it is likely the SIM card. If that is the case, then it needs to be put back in the same position. If it is not the SIM card, then you may need to contact the manufacturer to find out exactly how the card needs to be put back in.

  • 0 over 2 years ago

    "The white card" is not shown in the online instructions for battery replacement, as far as I can see, but it is indeed very important and it does have to be put back in a specific position as you suggested.  This is an adhesive membrane with a silver-color metal cage attached.  The cage (also not shown in the instructions) grips the battery and makes contact with it on its + edges (even though the white membrane keeps it from making contact on the + back).  The metal cage is designed to fit correctly in just one orientation inside the lid of the sensor.  That orientation brings the wide contact area of the cage into contact with the copper + contact on the sensor body at the circumference of the circle, and it places the three little prongs of the cage into three little slots in the sensor lid.   This all makes more sense if you can view it under magnification.

  • 0 over 2 years ago in reply to 4693973

    Very helpful video suggested by user 4693973 makes it clear and demonstrates using the invisible-untl-lit green LED to confirm success.  www.youtube.com/.../eXLsG9ZzRiQ

  • 0 over 2 years ago

    Same problem here and after reading through i was inspired to have a closer look.

    After opening the back there are two parts, the main body and the backing cover with battery embedded in it. 

    My problem was the tiny T shaped silver tab on the backing cover, this tab lines up with the locking positions marked on the body, my T tab had been turned in towards the battery, away from the gold contact point in the main body. 

    I carefully folded the tab out away from the battery and back into its own recess / notch and made sure it was sticking slightly out (not flush).

    Then i csrefully folded the gold tab up slightly on the main body. 

    Re-pair with device and problem solved.