Electronics > Repair

Replacing a nRF8001 radio in a Wahoo Kickr indoor Cycle trainer

<< < (3/3)

BobRyan:
Have you checked the signal into and out of the op amp? If this is malfunctioning it could explain why you get a signal when producing more power.

erikbrenn:

--- Quote from: BobRyan on December 18, 2020, 07:16:33 pm ---Have you checked the signal into and out of the op amp? If this is malfunctioning it could explain why you get a signal when producing more power.

--- End quote ---

Thanks, that makes sense, will try it out.   Haven't had time this weekend, I have to move my scope and stuff near the unit. Will post an update later, possibly after christmas :)


Smokey:
I just fixed my kickr v1 board (same as shown above).  Symptom was that it did absolutely nothing.  No BLE, No ANT.

I found a burned clamp diode across the 3.3V rail.  They have footprints for 4 parallel diodes, but only had 2 populated.  It actually worked fine with just the one remaining diode, but I replaced the burned one anyway:


Not sure if this is related, but wahoo admitted they had an ESD problem with these models:
https://www.dcrainmaker.com/2019/01/details-issues-surrounding.html


--- Quote ---This is the result of electrostatic discharge (ESD) that results in killing the onboard chip responsible for that. Totally dead killing, no half-deaths here. There’s no recovery from this except a unit swap. Wahoo details in the video what they’re doing to address this. The first step is switching to new power supplies (the power brick thing you plug in the wall) with discharge grounding. This should help most people. The second is adding an ESD diode to the CORE itself. They did note that this has actually been the same since the very original KICKR, it’s just that the KICKR sales volumes Wahoo has now are dramatically bigger (read: they’re selling way more units). It’s notable that when Wahoo support sends folks a replacement KICKR, they are very explicit in telling folks not to use the older (non-protected) power supply and instead to use the new power supply.  They even have a nifty picture to tell them apart with green and red text.

In particular though, the death by ESD bit is heavily environmentally weighted. Meaning, it explains quite logically how a single person could manage to kill 2, 3, 4 KICKR’s in a row. If you’re in a carpeted room with socks on, and manage to ‘shock’ your bike/trainer, that’ll do the trick. Trainer dead. Whereas if you’re in a concrete or other hard surface with little static electricity build-up, it’s less likely to happen to you. For example in the DCR Cave, it’s just a concrete beast. I don’t think I’ve shocked myself on anything yet (thus, no ESD issue on my trainers). Whereas if I was back in Washington DC, my living room there likely would have killed units like no tomorrow.
--- End quote ---

erikbrenn:
Thx for the update, topics never die :)   Unfortunately the trainer I worked on in 2020 is long gone...

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod