2225 Broken Input Selector Shaft

[19mm]

Just picked up with the input selection rotary switch shaft sheared off. Knob long gone.

I found reproduction knobs. Can’t find a replacement rotary switch except a few used ones on eBay that don’t look super confidence inspiring.

Anyone been down this road before? Ideas? Just buy the used ones and make do?

 

[Jonstigator]

Just buy the used ones and make do?

That is about all you can do. I had to do one on a 2225 and it was a royal pain keeping wires organized. If you look inside the solder points you will see little bare wire jumpers in there. make note of where they go incase one breaks or falls off, costed me hours of trouble shooting.

 

[ocdecio]

Here's an idea. Kinda hard to get it 100% straight (this was my first attempt) but better than any other alternative I considered.

 

[Jonstigator]

Well that was kinda neat! Can't hurt cause there is always the alternative.

 

[runningdog]

Easier than replacing the switch is to just swap out the broken shaft with a new (used) one.

Two long screws hold the shaft in place. Each screw is pushed out by using something the same diameter as the screw. I use a nail. The nail is pushed in and pushes out the screw. This way all the little spacers stay in place. After the new shaft is put in, the screws are replaced by using them to push out the nail.

It only takes a few minutes, but it's an exciting few minutes.

A shaft from a donor 2225 switch will work. And there may be another model using the same switch.

There are several threads on this, here is one of the oldest:

https://www.audiokarma.org/forums/index.php?threads/broken-selector-switch-shaft-fix.704469/

 

[ocdecio]

Easier than replacing the switch is to just swap out the broken shaft with a new (used) one.

For the 2225 this is probably true. For the 4300 Dolby switch, not so much. I tried for two days to wiggle it out enough to replace the shaft from another 4300 Dolby switch following that thread (excellent btw). There are so many wires and it is so tightly packed that I just couldn't do it.

 

[runningdog]

The 2225 and the 2230B use the same selector switch. SR0905009.

 

[Jonstigator]

Hind sight being 20/20 I would have done that! Thanks Running dog.

 

[stereofisher]

Here's an idea. Kinda hard to get it 100% straight (this was my first attempt) but better than any other alternative I considered.

View attachment 2389030 View attachment 2389032 View attachment 2389033 View attachment 2389034 View attachment 2389035 View attachment 2389040

Really cool!

 

[Allboats]

Easier than replacing the switch is to just swap out the broken shaft with a new (used) one.

Two long screws hold the shaft in place. Each screw is pushed out by using something the same diameter as the screw. I use a nail. The nail is pushed in and pushes out the screw. This way all the little spacers stay in place. After the new shaft is put in, the screws are replaced by using them to push out the nail.

It only takes a few minutes, but it's an exciting few minutes.

A shaft from a donor 2225 switch will work. And there may be another model using the same switch.

There are several threads on this, here is one of the oldest:

https://www.audiokarma.org/forums/index.php?threads/broken-selector-switch-shaft-fix.704469/

I guess as the flatted shaft is drawn out towards the front, you should chase it with (ideally, a scrap piece of flatted shaft, or) something to prevent the contact discs from falling out the bottom, and getting lost, swapped, or flipped 180 degrees.

(Not that they would roll of the bench, hit the floor, roll 20 feet, and hide).

 

[runningdog]

I guess as the flatted shaft is drawn out towards the front, you should chase it with (ideally, a scrap piece of flatted shaft, or) something to prevent the contact discs from falling out the bottom, and getting lost, swapped, or flipped 180 degrees.

Good point. I once let two of the contact discs on a Selector switch get out of alignment. It was a tense few minutes while I tried to remember exactly which ones I turned. I can attest to bizarre results when one or more are out of alignment.

To avoid this, turn the Selector switch all the way clockwise before removing the shaft. Then make sure the new shaft is also turned fully clockwise, so that when it is inserted it will line up correctly with the contact discs. My mistake above was a result of not having done this.

 

[Allboats]

Good point. I once let two of the contact discs on a Selector switch get out of alignment. It was a tense few minutes while I tried to remember exactly which ones I turned. I can attest to bizarre results when one or more are out of alignment.

To avoid this, turn the Selector switch all the way clockwise before removing the shaft. Then make sure the new shaft is also turned fully clockwise, so that when it is inserted it will line up correctly with the contact discs. My mistake above was a result of not having done this.

And, if there’s a little extra unused length to the new shaft, grind a little chamfer on the end to help it find it’s way through the contact discs more easily.

Having a flat end on your shaft makes everything much harder.