Resmed S9 Elite Teardown with pictures

palerider · Post by **palerider** » Fri Jan 26, 2018 10:51 pm

freetimecreations wrote:Those that tore into their ResMed S9, which direction were the ribs on the off white airflow baffle tube? Were they facing the input side or the output side?

I see the part looks the same on the inside but I believe the ribs were designed by ResMed for a reason. My theory is the ribbed side should be on the input side and their purpose is to direct turbulent air back over the tube and into the baffle tube.

Maybe this quiets the machine by a very small amount, or something. I've switched it both directions and can't tell, maybe it is too subtle to notice.

My baffle tube was on the output side, however my used machine 11,000 hours might have been serviced because it was super clean inside.

Doesn't matter, in my experience I'm pretty sure I've seen them either way. Those ribs may have been part of the mold design for injection molding. :shrugs:

As to it being clean inside, that's not uncommon. there's very little in there except the foam that will collect dust... and the worst I've ever seen out of the several machines I've opened was a very light spray.

EVOFXDWG · Post by **EVOFXDWG** » Wed Jan 31, 2018 1:21 pm

I used this post info to open my ResMed Elite to investigate the power wiring. I am looking at installing a DC-DC converter in the motorhome (12V in, 24V out) using a converter module avialable on Amazon. (Im an Electrical Engineer). I need to power it on 12V for occasional "boondocking"

I know about the Resmed 36970 DC supply. However, there are some negative reviews claiming shutoff when the battery voltage drops below 12V. Our deep cycle house battery system may very well go this low or near it on a typical night.

I am looking at this module instead (wiring it up myself with some pigtail connectors), since it claims to work below 12V input: https://www.amazon.com/gp/product/B00VR ... OGC9B25845

My question is: Does anybody know what the 3rd pin function is on the ResMed S9 power connector? I can test what happens when i cut that wire in the cable but thought I would ask here. I do know it is a signal not power (i measured 0 volts with AC plugged in, DC side unconnected) but not sure which way or what the function is. If its just a fault or error signal for the power supply, i can probably "fool" it by generating what ever the "good" voltage is using a resistor or simple circuit. It also might be a data programming pin, or some error signal from the S9 to the power supply, in which case i can probably ignore it.

If anyone has or knows where a schematic of the circuit board is, that would also provide something to analyze.

dcheddar · Post by **dcheddar** » Wed Jan 31, 2018 4:59 pm

EVOFXDWG wrote: My question is: Does anybody know what the 3rd pin function is on the ResMed S9 power connector?

The 3rd pin is a signal pin. It tells the S9 whether the power supply is the 90 watt version, which can power a humidifier, or the 30 watt version, which cannot.
I believe I've read it's done using different resistance values on the pin.

Read the post from palerider about the patent application in this thread:
viewtopic.php?f=1&t=112900

DougBurbidge · Post by **DougBurbidge** » Sat Mar 30, 2019 11:54 pm

Thanks for this -- very helpful.

There's an image missing from step 5. Specifically, we're talking about the external power input here, not the connector for the humidifier. Once you squeeze the two clips together, the whole board lifts straight up. (This was the trickiest step for me.)

The airflow path of the unit I was working on was coated with fine dust. This is because the external air-intake filter has ben lost for years. This dust was tightly adhered though, and I don't think it was a problem. (I cleaned it all anyway.)

I think the problem with this unit might have been the same thing that was making yours noisy: the beige plastic tube that you highlight in your photo in step 8. This was clogged with dust and hair.

This tube connects to a silicone shroud which in turn connects to the pressure sensor at the left of your photo in step 6. That pressure sensor has two inlets, and the tube contains a flow restrictor between them. I assume that the device measures the difference between the pressure on the two sides, and this tells it something useful about pressure or flow rate or something. If this gunges up, it will do its maths wrong.

(The behaviour on this unit was that it was turning off its airflow after a few seconds, or minutes, or an hour or two, and it needed to be turned off and on again to restore function.)

I'd drop mine out in the middle of the ocean before I'd attempt to do what you did.

I get that it's scary. But if the machine is broken or otherwise useless, there's nothing to lose. When you finish, it will still be broken, or you will have fixed it -- either way you haven't lost.

In hindsight I should have taken some photos as I did the final disassembly (taking off silicone seals to get at things to clean/inspect them) to make it easier to reassemble. In particular, i should have taken photos of where the motor wires go. I got it all back together OK, but photos would have made it easier.

jaupnorth · Post by **jaupnorth** » Fri Apr 19, 2019 4:18 am

Great article - thank you. I have just successfully stripped and reassembled my 2011 S9 with this guidance.

However, I think it would be helpful to add, at Step 3, the attached pictures.

On my model there are four slots in the bottom cover which allow one to insert a thin-bladed screwdriver and release each clip. Once the single Torc screw has been removed, the bottom cover is easily removed using this technique and the clips holding the front of the top cover become accessible; after releasing them, carry on with the two tough rear clips as described.

Thanks again

palerider · Post by **palerider** » Fri Apr 19, 2019 11:16 am

jaupnorth wrote: ↑
Fri Apr 19, 2019 4:18 am
Torc screw

You'll have more luck googling for those kind of drivers if you use the word "Torx".

DrBillTX · Post by **DrBillTX** » Sat Aug 29, 2020 10:30 am

Thank you for this complete and very effective documentation of the S9 teardown.

I had a problem that I thought would require lubing or replacing the fan, but might be just dust making it unbalanced. I had given up on it myself, and though, the web might have something.

Your instructions and photos with arrows were just right. The only quiet comment was that I did not understand that the initial 'lone screw' was also a Torx10.

I also loved your referring to the "pickers of Nits", as "Captain Snark". I will be using that in the future.

Again, my thanks, you gave me just what I needed.

Kudos all around

Passport in-hand · Post by **Passport in-hand** » Wed Jul 14, 2021 5:53 am

#foamgate for RESMED S9?

1. See Video from USA Medical Supply
https://www.youtube.com/watch?v=cLgONjFAhDM

2. Within this post (cpaptalk.com, Thread date, Mar 23, 2011) this DIYer posted S9 disassembly. 8th pic down shows the 'foam in-question'. Removal of foam appears to be 'easy', once blower module is removed.
viewtopic/t96624/Resmed-S9-Elite-Teardo ... h+pictures

Reference:
viewtopic/t96624/Resmed-S9-Elite-Teardo ... h+pictures

palerider · Post by **palerider** » Wed Jul 14, 2021 3:26 pm

Passport in-hand wrote: ↑
Wed Jul 14, 2021 5:53 am
Idiocy

Shut up, idiot.

zonker · Post by **zonker** » Wed Jul 14, 2021 5:32 pm

palerider wrote: ↑
Wed Jul 14, 2021 3:26 pm

Passport in-hand wrote: ↑
Wed Jul 14, 2021 5:53 am
Idiocy
Shut up, idiot.

SummerTime · Post by **SummerTime** » Wed Jul 14, 2021 6:12 pm

zonker wrote: ↑
Wed Jul 14, 2021 5:32 pm

palerider wrote: ↑
Wed Jul 14, 2021 3:26 pm

Passport in-hand wrote: ↑
Wed Jul 14, 2021 5:53 am
Idiocy
Shut up, idiot.

I agree with what this young man was thinking. I read minds. That's what CPAP has done for me.

.

zonker · Post by **zonker** » Wed Jul 14, 2021 6:51 pm

SummerTime wrote: ↑
Wed Jul 14, 2021 6:12 pm

I agree with what this young man was thinking. I read minds. That's what CPAP has done for me.

.

WHICH young man?

SummerTime · Post by **SummerTime** » Wed Jul 14, 2021 10:18 pm

zonker wrote: ↑
Wed Jul 14, 2021 6:51 pm

SummerTime wrote: ↑
Wed Jul 14, 2021 6:12 pm

I agree with what this young man was thinking. I read minds. That's what CPAP has done for me.

.
WHICH young man?

Seriously?? The handsome 'young' man in the picture.

.

Kedwin088 · Post by **Kedwin088** » Sun Aug 29, 2021 6:14 pm

Thank you so much for this post. A part of my filter was torn and got sucked into my machine. I am a 71 grandma and I have to have my cpap to sleep. Because of your posting I was able to take my machine apart, get the filter piece out and put the machine back together. I think you saved my life!

Silverguard · Post by **Silverguard** » Mon Nov 29, 2021 12:51 pm

Hi, curious to know where can I get (buy) a brand new turbine for Resmed S9 CPAP. I have gone through the web without success, can anyone help? Thank you

Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures

Re: Resmed S9 Elite Teardown with pictures