Re: CPAP Repair - PCB Coin Battery Power Loss?


Yes this makes sense why the machine behaves as it does, it may be heat leading to the failure.


I thought might have something to do with an external battery, but the error message says to replace the PCA in the service manual. Two power sockets on this device, and they are the same connector, see attached images. Since they're the same I tried connecting the AC/DC adapter into both and still get the E76 error message with both sockets.


I think the voltages are fine because the machine...

Re: CPAP Repair - PCB Coin Battery Power Loss?


I didn't remove them from the circuit.
I now read 16.35kOhms on both C11 and C10, they now give the same resistance. I had to have red multimeter lead on ground side of the capacitors. When the black lead is on the ground side of the capacitor then there is no resistance reading for either of them.

R35 gives 1.96kOhms.
CR5 gives 6.16kOhms red lead on battery side, black lead on that side has no resistance reading.

I'll try testing without C11 after testing a new battery, thank you...

So when the device runs, it stops working after maybe 10-30 minutes of use, beeps, flashes a red LED, and shows the error message "E76" on the LCD. Unplugging it & plugging it back in will get it to work for maybe 1-3 more minutes, then it fails again.

Attached is the error code from the service manual, as well as the relevant circuit shown in the service manual. I think the device is 10+ years old (I bought it off ebay), it is a discontinued model. Interesting that the service manual for this error code says to replace the entire PCB for the "failed" battery,...

Re: Can someone help me troubleshoot what's wrong inside my PSU?

Try heating the PSU up using a space heater. Worked for me. I just needed to raise it up to 70-75F or so. Seemed to me like one of the protection mechanisms on my PSU were triggered when the PSU was colder; causing it to shut off.

Hello all, and happy holidays,

First I will state my question: What do you think is causing the power supply to automatically shut down when cold? (somewhere <65F) After I heat it up for a few minutes using a space heater, it works on the first try! It would be nice to not have to heat it up using a space heater before starting it up. Kind of amusing though.

Here are my observations:[LIST=1][*]I've had this PSU for 5+ years. Dual rail. Couple HDDs, AMD CPU 125W, graphics card recommends 400W PSU w/ 12V current rating of 26A, but this PSU's relevant rating is 22A...