Whats Inside a Fader? | How To Test & Service One 

I once had an actual break of the carbon trace of one of the channel faders of my Porta Two. I mean nothing visible but running the multimeter on ohm mode along the trace clearly indicated a jump in the reading at one particular spot. After carefully applying a very small amount of conductive paint right there, I managed to get the fader back working again.

I am tickled pink concerning the results of my fixing the 22 Faders in my 1978 Soundcraftsmen PE-2217 Amp/Equalizer. The Faders were incredibly stiff, and some were electrically intermittent, while others became completely open after I slid them away from where they had been sitting for years. These Faders are an old stile and are made of 2 halves of plastic that are held together with 2 metal clips. They also have to be lubricated both on the inside and the outside. Anyhow, without even opening them up, I managed to fix them all via the use of Deoxit D5, and a silicon lubricant. They are now all functioning as good as new, and each of them slide with an incredible unexpected ease.

Thank you for all the useful videos! I'm about to receive a porta 424 mk1 and feel more confident to be able to fix it should something not work. Your blog is a treasure chest in itself! Great work :)

Thanks bro this vedio very helpful .

Top quality information. Thanks, much appreciated.

Wow, extremely timely as I just bought a Porta One and have some scratchy faders 🙂

So many of us really appreciate your videos (including myself) so thank you very much. I do have a question and comment: Is there any chance that you could video what is inside one of the Tascam 246 left / right PGM Master faders? As these are NOT the same inside as the others on the 246 and even the 244 from my experience and others, not typical low profile ALPS faders. Peering into the 246 from the top of the portastudio (with just the top plastic case removed), the 246 PGM Master L / R, for each of those faders, the wiper carriage rides on some sort of a metal center divider between two much smaller carbon elements, which is unlike the typical faders where the carriage rides on sides, and the carbon element is one big flat piece. I ask because I intended to clean these elements inside (without disassembly) and run into this unforeseen issue, like what is exactly in there? I realised that I can't just insert a small piece of lint free cloth in there soaked in deoxit D100 (and later F100) and work it up and down (the cloth) or do a short spray of D100 in there because of the metal center divider, making access rather impossible. Like what and where the hell am I spraying I ask myself? The other faders it is possible but not these ones.

No matter if the metal spring is conducted to fader case. I pull the plastic layer out to make fader more fast.

What would cause no variation in volume. Im getting either full volume or off?

i have problem bit that connect to slider nob is missing but still works when moving with flat head screwdriver any chance of fixing that? it’s made of metal how does connect at sider as i have spare mixer slider could pull stem out if know what i mean to connect to it

I bought a Fostex XR-7 from eBay and one of the faders is not working smoothly in terms of volume increase/decrease. It goes from 0 to (about) 8 when sliding it only slightly up. The only noticeable change in volume as I slide it up is when you get above about 8 and it increases again then. I know it's not a Tascam but wondered if you had any similar experience with that issue? Could it be a cleaning issue or something else? This channel is great by the way!

I was just wondering about this because one of the faders on my 688 recently stopped working. The level is the same no matter where the fader is. I thought of spraying contact cleaner in it to see if that helps but I wasn't sure if that would hurt anything. I wish I wasn't too afraid to take the machine apart.

Thanks for the useful info. I am looking to convert faders to rotary pots on a DJ mixer. Does this mean I have to test the existing faders and then find rotary pots with matching resistance as the faders? Thanks!

the left bus on my portastudio isn't making it through the master fader, but the right side works fine....i took it apart and cleaned the fader. theres no obvious visual signs of corrosion or damage and the traces have connectivity from end to end. its only one lead that doesnt seem to have any electrical connection to the traces, so im considering melting the plastic shell to see if i can fix it...is this crazy?

Volume fader for Allen and heath dlive s5000

This always works well. Unless, of course, the carbon trace is gone.