A couple of years ago I bought a Littmann 3200 electronic stethoscope. Love the thing. Fantastic (and adjustable) sound and recording capability and Bluetooth connection to upload those sounds to a companion app.
A couple of weeks back, the stethoscope started to glitch. Every now and then it would hard reset when I pressed the “-” button so I thought that was the end of it. I ordered a new one, planning on disassembling the old one once I had another good one. Today was that day.
Anyhow, as soon as I removed the membrane, it was pretty obvious what the problem was. Under the membrane, around the microphone, there was quite a collection of clear and sticky fluid. Looks a lot like the alcohol we use to disinfect hands and surfaces. I’m pretty sure the cleaning crew also cleans any stethoscopes they encounter and don’t think twice about dunking even electronic ones. I can’t imagine any other reason for fluid in my stethoscope.
Surprisingly, these stethoscopes are fairly easy to take apart, at least if you start at the right end, under the membrane. Sadly, the one part that can’t be removed is the keypad. So I never got to clean that out. But just by disassembling the scope and putting it back together, I seem to have fixed the problem.1
In the pictures, the blue one is the old, flaky one. The red (“burgundy”) is the new one. There’s a four year difference between them, but they have the exact same version of firmware.
I purchased the Littmann 3200 with an engraving to have it returned to me (in appropriate language) but it faces the patient which I’d rather it not. I can’t seem to find a video or walk through on dissecting an electronic stethoscope (I’m nervous to break something). Did you pull the binaural pieces out of the tubing? Was it difficult, any tips? Thank you in advance!
Tifany,
I’m having a lot of fun imagining what that “appropriate language” could be.
Anyway, the tubes themselves are just that, tubes with air in them. There is nothing electronic, since there is a speaker in the head itself. At least, that is how I understood the construction. So, if that’s true, you should be able to pull the tubes off and put them back on reversed. On the other hand, the proximal pieces go over the metal tubes with the earpieces, and to me it looks like they’ve been crimped on, probably with a heat gun or something. I think you need to find out how the metal pieces are joined together before attempting anything. Maybe take an x-ray of it first?
It does seem like a difficult operation, though. Personally, I wouldn’t risk it. Maybe better find a way to change, cover or remove the engraving? (I don’t even know how it looks, not having had any engraved myself.)
Hello, I have the same problem; but I work alone…noone can put any liquid on it.
I found my scope not working anymore. I thought it was the battery but after replacing it doesn’t work anyway.
So I’m planning to disassembly and understand what’s going on.
Thank you for sharing pictures
What tool did you use to remove the black outer plate from head’s body?trying to revive my 3200!
You mean the membrane? Just pry it off with your fingers.
No, after you take the membrane- replaceable diaphragm, the next black outer layer that looks like it has rivets and surrounds silver dimpled, half-moon cut out inner part and round center area that looks like a button battery.
Tammy,
The microphone part is fixed with four screws. At first glance they look like rivets, but they’re actually Torx screws. You need a hexagonal screwdriver or bit of size T6. The other screws inside the head are also Torx screws, but I think they may have different sizes, so a kit of small Torx bits or screw drivers does come in handy.
Martin. you’ve been incredibly kind and helpful. Thank you so much for posting this information. I’m an older nurse, and I’m a little hard of hearing. The 3200 helps men do my job with less effort and stress. Litmann does not service these any longer and I wasn’t able to find a replacement head… thus appointing me the chief bottle washer and tinkermeister! You’ve been very helpful. Thank you! Much happiness and health to you and your family!
So sorry for the confusion and thank you for your pics and info! You described the part in your second pic as the backside of the microphone.