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Old 9th Jul 2020, 8:25 pm   #1
bigfathairyvika
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Default Pioneer rotary to linear remote switch repair.

Hi All,

For a while now repairing Pioneer amplifiers I haven't had any mechanical parts in need of repair until today.
It is one of those switches where the rotary control on the front panel converts to linear motion and then has a long flat lead to a sliding switch on a pcb.

Now it appears that due to someone elses previous attempts at repairing the electrical side , they have managed to break the flat lead as it goes into the rotary control.

Has anyone had success repairing these?

My first thoughts are maybe the lead can be cropped and reattached, but this would likely shorten the lead too much.

Any pointers before a delve head first into this?

Thanks

Mark
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Old 10th Jul 2020, 7:52 am   #2
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Default Re: Pioneer rotary to linear remote switch repair.

Is the "lead" a bowden cable?
 
Old 10th Jul 2020, 8:41 am   #3
mole42uk
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Default Re: Pioneer rotary to linear remote switch repair.

I’ve a Technics amplifier on the bench right now which uses the same system. It’s a flat ribbon with holes for a sprocket at the user control end. I looked at shortening the link but making new holes for the rotary end seems a lot of work. A successful repair was done by replacing the rotary part with a normal switch and extending the wiring back to the pcb.

In this case, I’ve bought a replacement link from eBay…
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Old 10th Jul 2020, 5:19 pm   #4
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Default Re: Pioneer rotary to linear remote switch repair.

It isn't a bowden cable , although could be classed as one.
Bowden's are the same as push bike brake cables.

Attached is picture of the cable.

The idea of changing the switch to a standard rotary electrical one and running wires could well be the end result if I cannot repair or find a replacement.
A quick measurement of the cable I've noted that it cannot be shortened as it won't then reach the switch!.

As I've nothing to lose, I will try putting a bit of heatshrink over the damaged part and see if that works. Or, strap a piece of ridged plastic across it.

EDIT: Just checked the circuit, the switch selects the phono input impedance transformer, so any long wiring I'll have to use nicely shielded cable.

Mark
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Last edited by bigfathairyvika; 10th Jul 2020 at 5:24 pm. Reason: closer look at circuit
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Old 10th Jul 2020, 5:44 pm   #5
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Default Re: Pioneer rotary to linear remote switch repair.

That's pretty much identical to the Technics one. I doubt heatshrink will fix it. I wouldn't think that replacing the device with a normal panel mounted switch is trivial given the signal levels involved. The Technics I'm repairing is a class A amplifier and any cables from the pre-amp panel to a remote switch would have to route perilously close to one power amp.
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Old 13th Jul 2020, 10:44 am   #6
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Default Re: Pioneer rotary to linear remote switch repair.

Richard, how did your find you replacement, i have searched ebay to no avail.
I have found a mention on the pioneer parts site but marked as unavailable.
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Old 13th Jul 2020, 2:02 pm   #7
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Default Re: Pioneer rotary to linear remote switch repair.

I think I just struck lucky....
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