WMR928N Repairs
Posted: Wed 12 Jan 2022 8:30 am
Hi,
As most WMR928[N,X] weather stations are somewhere in the region of 20+years-old now I thought I would start a thread that suggests ways to repair failed or failing parts of this weather station. If you would like to comment or have suggestions of your own please feel free to reply to this thread.
Here are a few things that I have repaired on my WMR928N:
If you are not experienced or confident with electronics repair the next suggestion may be something better left to an expert, if you can find one to help you. If an inductor has failed these can be replaced, but you will need to work out the values of any that have gone open circuit. Under your magnifier, count the number of turns of the inductor and complete the details in the form here: https://www.translatorscafe.com/unit-co ... nductance/, or here for more a more detailed inductance calculation: https://hamwaves.com/inductance/en/index.html#input, estimating the other form details as best you can based on measurements you can make manually or just estimate. Of course the result may not exactly match the original inductor value, but it should be close if you have the parameters set well in the form. RS Components stocked the inductor I needed to replace in my STR928 and it works well. Some experimentation may be needed to complete the repair should you find the value you use for your replacement does not restore the transmitter to working order.
Only attempt repairs on the sensors if you are confident you can do so and have some experience of carrying out DIY repairs on similar projects. These repair suggestions are provided in good faith to anyone in the knowledge that if they fail to repair whatever it is that is faulty they were happy to have taken on the challenge, come what may. In other words, don't blame me if your repair attempt makes things worse!
That's all I have for now.
Cheers,
Adam
As most WMR928[N,X] weather stations are somewhere in the region of 20+years-old now I thought I would start a thread that suggests ways to repair failed or failing parts of this weather station. If you would like to comment or have suggestions of your own please feel free to reply to this thread.
Here are a few things that I have repaired on my WMR928N:
- The indoor thermo/baro/hydro (BTHR918N) meter's original humidity sensor deteriorates within a few years causing low humidity readings
- The STR928 and/or STR938 solar panel housing comes apart due to the plastic screw pillars failing, allowing moisture ingress which often leads to the transmitter failing.
- The STR928 and/or STR938 no longer transmits due to moisture getting into the electronics and corroding wiring and/or components.
If you are not experienced or confident with electronics repair the next suggestion may be something better left to an expert, if you can find one to help you. If an inductor has failed these can be replaced, but you will need to work out the values of any that have gone open circuit. Under your magnifier, count the number of turns of the inductor and complete the details in the form here: https://www.translatorscafe.com/unit-co ... nductance/, or here for more a more detailed inductance calculation: https://hamwaves.com/inductance/en/index.html#input, estimating the other form details as best you can based on measurements you can make manually or just estimate. Of course the result may not exactly match the original inductor value, but it should be close if you have the parameters set well in the form. RS Components stocked the inductor I needed to replace in my STR928 and it works well. Some experimentation may be needed to complete the repair should you find the value you use for your replacement does not restore the transmitter to working order.
- The cover on which the adjustable arm is attached to the STR928/STR938 allows moisture into the solar transmitter electronics/battery compartment.
Only attempt repairs on the sensors if you are confident you can do so and have some experience of carrying out DIY repairs on similar projects. These repair suggestions are provided in good faith to anyone in the knowledge that if they fail to repair whatever it is that is faulty they were happy to have taken on the challenge, come what may. In other words, don't blame me if your repair attempt makes things worse!
That's all I have for now.
Cheers,
Adam