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Micro Switches for Pioneer PL-71

the_chemist

the_chemist

New Member
Does anybody know of replacement micro switches for speed controls in the Pioneer PL-71 series of turntables. (PL-51, PL-55X are all similar)

The factory speed micro switches oxidize and no longer function properly. You get speed drift. There is no way to spray them either as they are sealed.

Any replacement information on switches that will fit and work properly would be greatly appreciated!

Thanks,
Chris
 
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the_chemist said:
Does anybody know of replacement micro switches for speed controls in the Pioneer PL-71 series of turntables. (PL-51, PL-55X are all similar)

The factory speed micro switches oxidize and no longer function properly. You get speed drift. There is no way to spray them either as they are sealed.

Any replacement information on switches that will fit and work properly would be greatly appreciated!

Thanks,
Chris
Click to expand...

Are you sure the can't be opened? I have the same problem on my PL-71, although the problem is very slight.
 
number13 said:
.... and I'm back. The part number is 26-1825.
These are made for microwave ovens, they are nice and snappy!
Click to expand...

number13,

I owe you big time! Thanks, I ordered some. I have a PL-71, PL-55X, and PL-51 that are all in need of new switches.

I wonder if Matsushita sold the originals to pioneer knowing they would oxidize in order to sell more Technics Turntables :-)

Again, my deepest thanks!

Best Regards,
Chris
 
flavio81 said:
Are you sure the can't be opened? I have the same problem on my PL-71, although the problem is very slight.
Click to expand...

The only way I know to open the switches is to drill out the rivets, then glue them back together.

I went so far as to dunk them in a shot glass filled with isopropyl alcohol and CRC contact cleaner. I know it went inside the switches because I saw it draining back out again, but it did absolutely no good. The contact was still a poor closed circuit.
 
They are an exact fit, but the solder tabs are arranged differently. Be sure to note which wires go to NO, NC or COM then attach to the new switch accordingly.
BTW - these switches give out because when the table is powered off they are in the sprung position. after 20 or so years like that they simply don't make solid contact anymore. I always replace them when I find them in a table.
 
jaybird said:
Would the worn switches cause speed fluctuations?
Click to expand...

Absolutely the switches will cause speed fluctuations! That's why I am replacing mine. I didn't know where to get switches that fit properly without buying and trying until number13 was so kind as to help me out.

I found some that were pretty close but not an exact fit.

Chris
 
How does one fit the MCM switch in? The holes line up, but the COM tab sticks up, unlike the Matsushita so I can't get the screw into the hole on the support...
These are part no. 26-1825, do I need something different?
 

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turbohippy said:
How does one fit the MCM switch in? The holes line up, but the COM tab sticks up, unlike the Matsushita so I can't get the screw into the hole on the support...
These are part no. 26-1825, do I need something different?
Click to expand...

You know, I bought the switches based on "number13's" recommendation and I have them sitting on my workbench downstairs. I didn't actually try them yet.

When I got the email that you replied to the PL-71 switches post, I went downstairs and took my PL-71 apart to look.

It appears that we either have to bend that gold chromate mounting flange top or cut it off altogether.

You are right. The switches won't fit because of the common tab.

I may have to take the gold chromate mounting flange off, bring it to work and have our prep department cut it for me. I am an analytical chemist who analyzes ores and alloys. We have a milling department to grind up raw samples for the lab. I'm sure they can cut it.

We'll figure it out. If I can get mine, I'll help you with yours. Just may take me a little while to get to it.

Chris
 
Thanks Chris!
Obviously, the first choice would be an exact fit, but plan B does get a fair amount of action...
 
turbohippy said:
Thanks Chris!
Obviously, the first choice would be an exact fit, but plan B does get a fair amount of action...
Click to expand...

I found this size switch by different manufacturers at other places as well after member13 helped me out with the MCM recommendation. It turns out they all have the common tab on top now. Go figure...

I'll try to get that plate off in the next week or so and get part of it cut out. I'll keep you posted on my progress.

If mine turns out ok, I can help you with yours.

Unfortunately tonight was the demise of my dustcover. When I was turning the PL-71 over my MINT dustcover sprang open as it slipped out of my hands, crashed to the floor and shattered. Now I guess I'll have to get a new one made. Totally bummed!

Chris
 
Ouch!
It is such a pretty table and I am not a dust cover guy (did come with a cracked one) -you may find yourself happier with the look and sound of no cover and find other ways to deal with dust...
On first glance it appears to be more than one screw to get that plate off - same deal- if i spend 30 minutes figuring out something that takes 10 seconds I will let you know.
I'll get at it tomorrow - Blazers/Lakers time now...
 
turbohippy said:
Ouch!
It is such a pretty table and I am not a dust cover guy (did come with a cracked one) -you may find yourself happier with the look and sound of no cover and find other ways to deal with dust...
On first glance it appears to be more than one screw to get that plate off - same deal- if i spend 30 minutes figuring out something that takes 10 seconds I will let you know.
I'll get at it tomorrow - Blazers/Lakers time now...
Click to expand...

I talked to our prep guy here at work today.

He said no problem cutting the top of that flange off.

I'll get mine out and take it in to have him cut it.

If all turns out ok, you can send me yours and I'll have it cut as well.

In the mean time, I'll look for an exact replacement switch. You only need to replace the one that goes to the speed controls. The other is just an off/on power switch

I have to replace these same switches in my Pl-55x and Pl-51 as well. I hope this is not the case with all of them!

Chris
 
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