HELP identifying Boss potentiometer please

[Switchy]

I have a glitchy Boss pedal and I believe it is the selector switch which needs replacing.
Photos are attached. I only see B50K which is pretty generic, and I see a "70"? on the other side.

This is a selector switch with 7 steps.

Appreciate any help in the right direction to source a replacement. It's a newer Boss phaser with SMD board.

 

[Norris Vulcan]

Is it a regular pot or a rotary encoder ? i.e. does it have a 'stop' at each end of travel or does it just turn and turn....?

 

[Switchy]

Is it a regular pot or a rotary encoder ? i.e. does it have a 'stop' at each end of travel or does it just turn and turn....?

It has 7 steps or detents. I don't know what that would be called. If I knew the technical term, I may be able to source it from a parts supplier.

Thanks for any info!

 

[zombiwoof]

Try Small Bear, he has some Boss replacement parts. If you can't find it, call Boss's parts division, they will ship you the exact replacement.
I found out that some Boss pots are not common stock, they are proprietary, made just for them. I tried to find one 9mm pot for an old DS1 at parts places, it doesn't seem to exist except at Boss.
Al

 

[teleplayr]

My first place to find replacement parts is to contact the manufacturer.

 

[J-Flanders]

It has 7 steps or detents. I don't know what that would be called. If I knew the technical term, I may be able to source it from a parts supplier.

Thanks for any info!

9mm, 7 position rotary switch, D-shaft, PCB

Some label them as rotary pot or rotary encoder (switch)

How do you know the switch/pot is failing and not some components which it connects to?

 

[Si G X]

Maybe I'm just ignorant on some specifics ... but that doesn't look like an SMD board to me, it all looks through hole?

 

[Switchy]

9mm, 7 position rotary switch, D-shaft, PCB

Some label them as rotary pot or rotary encoder (switch)

How do you know the switch/pot is failing and not some components which it connects to?

Actually I don't but it is my best guess. Here is what is going on:

The pedal has 7 settings, basically time increments like a delay. The top 5 settings work fine, the last 2 settings only work intermittently. Mostly not, but they come in and out randomly like a short. It does it even if I don't touch the pedal.
Unfortunately the board is SMD so I can't troubleshoot it visually. I don't see any obvious problems.

 

[Switchy]

I've seen it mentioned that others have experienced the similar problem, but I didn't see any solutions.
Here's another person with the same issue:

 

[Jacobvo]

I have found the potentiometer but it is in Australia: (link removed). I'm trying to track down the part here in the U.S.

 

[Stillhouse]

BOSS support is your best bet. This seems to be their parts department:

https://www.roland.com/backstage/login?redirect=/support#parts_order_request

 

[Jacobvo]

Alright, I submitted a request for 2. We'll see what happens!

 

[cousinpaul]

Have you tried cleaning the switch?

 

[Jacobvo]

Have you tried cleaning the switch?

I sprayed the knob with contact cleaner but because it is sealed, I have no way of knowing if the cleaner got in there. There is a possibility that the resisting material on the knob also has worn away.

---

I did get a response from Roland:

“Unfortunately we cannot sell internal parts to consumers because of our worldwide policy, you'll have to go an authorized service center to get the potentiometer serviced for your pedal. If you'd like me to proceed, I can place an order for the knob that you need. Apologies for the inconvenience.”
​

This, of course, is unhelpful but I wanted the service rep to clarify what “If you'd like me to proceed, I can place an order for the knob that you need.” meant.

 

[Jacobvo]

I sprayed the knob with contact cleaner but because it is sealed, I have no way of knowing if the cleaner got in there. There is a possibility that the resisting material on the knob also has worn away.

---

I did get a response from Roland:

“Unfortunately we cannot sell internal parts to consumers because of our worldwide policy, you'll have to go an authorized service center to get the potentiometer serviced for your pedal. If you'd like me to proceed, I can place an order for the knob that you need. Apologies for the inconvenience.”
​

This, of course, is unhelpful but I wanted the service rep to clarify what “If you'd like me to proceed, I can place an order for the knob that you need.” meant.

Roland will only sell me knobs and external supplies but not a potentiometer. I have emailed Small Bear to see if they'll help. If not, I'll try a local authorized repair shop to see what they can do.

 

[Stillhouse]

That bites. When the mode switch went out on my Digitech reverb pedal their service department sold and shipped a replacement directly to me.

 

[Jacobvo]

They refuse to help me, even with a part number.

 

[ICTRock]

http://www.pedalpartsaustralia.com/...d=2172&zenid=3dcf27ccd5c888ffaae25ba6365f0223

you're welcome

you're lucky to have found the part for sale anywhere so I'd just pay them what they want

 

[Jacobvo]

http://www.pedalpartsaustralia.com/...d=2172&zenid=3dcf27ccd5c888ffaae25ba6365f0223

you're welcome

you're lucky to have found the part for sale anywhere so I'd just pay them what they want

Thank you!

This is actually what I want: (link removed)

$25 AUD shipping is really tough to manage. I might see if they can get some more and then ship a bunch over so I can sell them on reverb or something and mitigate that cost.

 

[ICTRock]

you need the right angle pc pin d shaft one I posted the link to ... the knurled shaft straight pc pin is for the dd-6