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It is currently 18 Nov 2018, 16:43

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 Post subject: Re: need some advice
PostPosted: 29 Oct 2018, 19:48 
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Joined: 12 Mar 2013, 06:07
Posts: 101
Location: Thunder Bay On.
Here is the pot assembled.I haven't bent the tabs over to secure the motor but you can see all the pins.


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 Post subject: Re: need some advice
PostPosted: 29 Oct 2018, 20:20 
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Joined: 26 Dec 2016, 03:46
Posts: 160
Location: Bayarea
Yeh, this is the kind I am not familiar with. Don't you have a sticker on the pot to show the part number? None of the pictures showed.

I looked on ebay, most don't show the bottom pins ( important for you as you have a switch for loudness). The few spec 6 pins that's not what you want.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R1.TR1.TRC0.A0.H0.Xalps+motorized+.TRS0&_nkw=alps+motorized+potentiometer&_sacat=0

Sorry, still cannot help you.


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 Post subject: Re: need some advice
PostPosted: 30 Oct 2018, 05:05 
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Joined: 12 Mar 2013, 06:07
Posts: 101
Location: Thunder Bay On.
Here is the only sticker that was on the pot and a pic of the board that it was soldered to.If it wasn't for the loudness tap on the pot this would be easy.


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 Post subject: Re: need some advice
PostPosted: 30 Oct 2018, 08:52 
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Joined: 09 Oct 2012, 19:43
Posts: 308
Location: Vancouver Canada
That last sight you where given has lots of dual 50K Log taper pots with the forth volume tap on the board, they just haven't added the forth pin.

It is possible to add the 4th pin but you will have to remove that dreaded washer, (they do come off if you careful removing them). I use a small flat screw driver blade to put between each slit in the washer and gently pry it way from the shaft. At the same time use a razor blade knife or something flat and thin under the washer to keep pressure on the washer. Going round and round the shaft moving the washer off little but each time. Slow and careful but then the whole assembly slides off the shaft. The washer is spring steel so it will go back on and hold as long as it isn't mangled 1/2 way threw the removal due to the index finger being impaled by the driver tip followed by (^%^^(%%tyu). A glass of wine or 2 may be required during this process. The trick then becomes finding a rivit gun and/or small rivits to compression fit the 4th pin to the board. They must be rivited on, they can not be soldered.

I would leave the existing pot alone and buy one of the ones with 3 pins but 4 positions for 4 pins and also buy an el-cheepo plain one to get the 4th pin from. That way you are not working on the customers parts. A little time, little learning, and the cost of 2 rivits and one extra plain pot is what it will take. Oh and the wine of coarse. The el-cheepo pot will give you 6 rivits and/or 6 pins moulded into rivits which gives you 6 tries at removing2 that you can then use as the 4th pins.
Sometimes what you need is just no longer available and mother nature and invention must take over.


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 Post subject: Re: need some advice
PostPosted: 30 Oct 2018, 11:12 
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Joined: 12 Mar 2013, 06:07
Posts: 101
Location: Thunder Bay On.
thank you Laurie54 i will do as you suggest


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 Post subject: Re: need some advice
PostPosted: 30 Oct 2018, 11:55 
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Joined: 26 Dec 2016, 03:46
Posts: 160
Location: Bayarea
Just wait until the email of Accuphase is up on 11/5 and ask them to see whether you can buy the part from them. I would not modify customer's unit. If anything happens, you can get blame.

The sticker 015t did not come up in the search.


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 Post subject: Re: need some advice
PostPosted: 30 Oct 2018, 16:10 
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Joined: 12 Mar 2013, 06:07
Posts: 101
Location: Thunder Bay On.
I am not intending to modifying anything. if the part is not available than too bad get someone else to stick their neck out and mod it.


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 Post subject: Re: need some advice
PostPosted: 03 Nov 2018, 17:10 
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Joined: 12 Mar 2013, 06:07
Posts: 101
Location: Thunder Bay On.
Thank You everyone for your input. I got it apart after 4 coffee's stuck my fingers 3 times and a few choice words later it is apart.

the resitive elements don't seem to be too bad but what I found is some hardened brown gunk on the wiper assemblies.
I scrubbed them to a shiny gleam and then cleaned everything again before assembly.
tested with my analog meter and the needle moves smoothly. But the real test in in the amp.
later on I will put it back into the amp and test.


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 Post subject: Re: need some advice
PostPosted: 05 Nov 2018, 13:42 
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Joined: 09 Oct 2012, 19:43
Posts: 308
Location: Vancouver Canada
Way to go. The brown gunk is probably old grease. It is added for lubrication and partly for isolation from air (preventing oxidation). I'm happy you decided to take the plunge. It's a bit scary and finicky but in the end the knowledge gained is invaluable.


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 Post subject: Re: need some advice
PostPosted: 05 Nov 2018, 15:51 
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Joined: 26 Dec 2016, 03:46
Posts: 160
Location: Bayarea
I am having problem with my ALPS motorize pots, multiple ones, BRAND NEW. My problem is the pot won't turn, gear is slipping. I opened it up, there is no adjustment, it's designed to slip when you hit the end, but it slip too easy even in the middle of the turn. I am converting my power amp into integrated amps and I am just getting them up and the problem shows. I can't even blame the Chinese seller as I have two of the pots bought from Mouser gone bad, it's not a fake ALPS, it's lousy design.

I layout the preamp pcb for the pot, now if I change pot, I have to re-layout the pcb. This really sucks.


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