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+--- Thread: [Equipment] Inside View of a ResMed S9 CPAP Machine (/Thread-Equipment-Inside-View-of-a-ResMed-S9-CPAP-Machine)
RE: Inside View of a ResMed S9 CPAP Machine - kbeckman - 01-22-2013
(01-22-2013, 01:24 PM)gjw Wrote: Wonder what happens when the CR2032 batteries die?
Once the battery dies, and you unplug it, or lose power you are screwed.
There are unique parameters in the unit that are not field programmable.
RE: Inside View of a ResMed S9 CPAP Machine - SuperSleeper - 01-23-2013
Those CR2032 CMOS batteries usually have a long life, usually at least as long as the average lifespan of the CPAP machine. I've had computers that sat around unplugged for nearly 10 years, and even then, the CMOS battery was fine and kept pretty good time during the entire decade of non-use.
I'm surprised that a CPAP machine would be unusable if the CMOS battery dies or is removed. After replacing it with a new battery most computers will simply revert to an original factory state and I would think that the only thing you'd lose would be user's info or the clinician settings (thinks like pressure settings, date/time, etc.)...
But then again, I haven't tried to remove mine to test that theory, and no... I ain't gonna either.
kbeckman Wrote:There are unique parameters in the unit that are not field programmable.
I'm wondering did you test this yourself perhaps? Or how did you find this out? I would think that all necessary code would be embedded into the firmware, not held in CMOS RAM.
RE: Inside View of a ResMed S9 CPAP Machine - archangle - 01-23-2013
(01-22-2013, 01:24 PM)gjw Wrote: Wonder what happens when the CR2032 batteries die?
;-> gjw
The clock probably stops working and screws up data collection for one thing.
Yet another way to screw the patient and require him to pay a larcenous rate for an unnecessary service call because the battery isn't customer replaceable.
RE: Inside View of a ResMed S9 CPAP Machine - PaulaO2 - 01-23-2013
(01-22-2013, 07:43 PM)kbeckman Wrote:(01-21-2013, 09:38 PM)PaulaO2 Wrote: How difficult was it to take apart? I'm thinking of taking apart my Escape to see how they compare. Perhaps the real question is how hard was it to put back together?
For me, it was rather easy, but I'm used to taking things like this apart.
I can't recommend to anyone that they take these apart, as this is a medical device.
Oh, I'm used to taking things apart and back together again. It's a hobby of mine I guess.
I have the Escape and since I'm not depending on it, I'm really really tempted to see how it differs inside.
I'm even more tempted now to take out the battery and see what happens.
RE: Inside View of a ResMed S9 CPAP Machine - Ugly - 01-23-2013
(01-23-2013, 05:37 PM)PaulaO2 Wrote:(01-22-2013, 07:43 PM)kbeckman Wrote:(01-21-2013, 09:38 PM)PaulaO2 Wrote: How difficult was it to take apart? I'm thinking of taking apart my Escape to see how they compare. Perhaps the real question is how hard was it to put back together?
For me, it was rather easy, but I'm used to taking things like this apart.
I can't recommend to anyone that they take these apart, as this is a medical device.
Oh, I'm used to taking things apart and back together again. It's a hobby of mine I guess.
I have the Escape and since I'm not depending on it, I'm really really tempted to see how it differs inside.
I'm even more tempted now to take out the battery and see what happens.
That leads me to wonder.
Oh and by the way, I'm pondering this - untested and as far as I can tell it may even be dangerous. The brave soul who does this, it is at their own risk.
If removing the battery messes things up, then it stands to twisted logic to replace the battery while the machine is plugged in and still operating. Now, I know that this can run the risk of electrical shock to the person attempting it, but theoretically speaking, can it be done successfully?
I can bet that my old Healthdyne machine had no battery. It collected and stored no data. It just pumped air. That's how it stayed in service for 14 years. To be sure, during my undercover investigations on the ResMed site, I was able to download all the clinical manuals I wanted :grin: but no service manuals.
RE: Inside View of a ResMed S9 CPAP Machine - PaulaO2 - 01-23-2013
Quote:If removing the battery messes things up, then it stands to twisted logic to replace the battery while the machine is plugged in and still operating. Now, I know that this can run the risk of electrical shock to the person attempting it, but theoretically speaking, can it be done successfully?
No. There's too much of a risk of touching something live. Or, worse, dropping the battery and have it short out the board by touching two things at once. Then there's the arc risk.
RE: Inside View of a ResMed S9 CPAP Machine - jeno - 01-24-2013
You'll find the internals of the machine are 24 volts or less, so you are pretty safe poking around inside it. Of course there is the risk of electrostatically frying the odd chip or two on the board and crippling it. It is a small computer after all.
It's 24v output from the power brick so that's OK to play with, but don't mess with the brick itself or power point side of the brick
RE: Inside View of a ResMed S9 CPAP Machine - archangle - 01-24-2013
(01-23-2013, 09:41 PM)PaulaO2 Wrote:Quote:If removing the battery messes things up, then it stands to twisted logic to replace the battery while the machine is plugged in and still operating. Now, I know that this can run the risk of electrical shock to the person attempting it, but theoretically speaking, can it be done successfully?
No. There's too much of a risk of touching something live. Or, worse, dropping the battery and have it short out the board by touching two things at once. Then there's the arc risk.
Looks like the battery is on the bottom of the circuit board, so that would make it doubly difficult. You might be able to take the card out, and plug the power supply in, then swap the battery. Not that I'm recommending it.
RE: Inside View of a ResMed S9 CPAP Machine - archangle - 01-24-2013
(01-23-2013, 01:48 AM)archangle Wrote:(01-22-2013, 01:24 PM)gjw Wrote: Wonder what happens when the CR2032 batteries die?
;-> gjw
The clock probably stops working and screws up data collection for one thing.
Yet another way to screw the patient and require him to pay a larcenous rate for an unnecessary service call because the battery isn't customer replaceable.
BTW, at least it's not like the Respironics machines where you can't even reset the clock without software and a special cable not available to the general public.
Observations and Questions. - archangle - 01-24-2013
Parts on the board as best as I can figure
Underside view
Power connector (Upper left with red, white, black wires.)
Modem connector (blue)
2 point airflow sensor (black, just below modem connector) Rests on top of two round silicone bumps. Note that the airflow sensor appears to be before the fan in the airflow path.
Main processor. (Black square just right and below 2 point airflow sensor) ARM processor.
SD card holder (Upper right)
Humidifier connector (Left edge, below power connector)
"Sensor 1" (lower left with round silicone air connector) Probably the pressure sensor located after the fan in the airflow.
SK3 (White rectangle to the left of Sensor 1) The connector where the blower plugs into the circuit board (I think).
It's neat how the only thing to plug in is the power connector for the blower motor. The airflow connectors just lay on top of the port they need. The buttons just sit on top of the switches.
How does the knob come off?