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[Equipment] CMS50F oximeter locked up - and FIX!
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Don in Austin Offline

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Posts: 79
Joined: Aug 2013

Mask Type: Full face mask
Mask Make & Model: Dental device, Quattro FX
Humidifier: RESMED H5i
CPAP Pressure: 4.0-12.0
CPAP Software: ResScan SleepyHead

Other Comments: Using TPAP custom dental device, with VPAP/BiPAP

Sex: Male
Location: Austin, Texas

Post: #1
Smile CMS50F oximeter locked up - and FIX!
While changing some settings in my pulse oximeter it locked up and became totally unresponsive -- freak software glitch I guess. I could have left it on until the battery went dead but that could take quite a while. This model has a non-removable, (well, not intended to be removed) USB rechargeable battery. A small phillips screwdriver allowed me to take the unit apart. I momentarily short circuited where the battery leads are soldered to the circuit board and the unit turned off. Now working normally. I hope this helps somebody.
08-10-2013 11:04 AM
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Paptillian Offline

Preferred Members-2

Posts: 474
Joined: Jun 2013

Machine: S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: H5i
CPAP Pressure: 4 - 10, EPR x2
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Pennsylvania, USA

Post: #2
RE: CMS50F oximeter locked up - and FIX!
Some batteries have protective mechanisms built in to detect short-circuit conditions and shut down the power cells, but it's not a good assumption. Also the protective circuit could be defective and malfunction at the worst time.

With lithium type batteries especially, shorting could quickly overheat it and lead to fire or injury. The key word in Don's technique, in my opinion, is 'momentarily.'

Good trick, thanks for sharing!

08-10-2013 05:32 PM
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