Systemdek I motor issue

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mjolnirr
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Systemdek I motor issue

Post by mjolnirr » 19 Sep 2019 12:36

Hi,

just wondering if someone could help me identifying capacitors at my newly acquired Systemdek I. The motor is not rotating, you can feel that there is some power going to the motor as it is shaking a bit but is not doing anything. I decided to replace both capacitors but I am not sure if the ones that are already there are original. could any one check if these (see photos) are as they should be. of maybe that's just a faulty motor :/
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mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 04 Dec 2019 11:28

this may be an important information, the motor in my turntable is saying 110v.
now the question is if i have not burnt the motor trying to run it in uk
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JaS
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Re: Systemdek I motor issue

Post by JaS » 04 Dec 2019 12:04

The 110V motor is the same for all markets and the capacitors look original too. However, there should be something like a 6K8 wirewound resistor in there too if it's wired for use with 240V?

mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 04 Dec 2019 15:10

that's the thing, there is nothing like wirewound resistor there :/ Would it be very difficult to identify what kind of resistor is missing here?

JaS
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Re: Systemdek I motor issue

Post by JaS » 04 Dec 2019 19:17

Weird, someone answered your question but must have changed their minds? Anyway, the gist of it was that Systemdek probably used two caps and no resistor like in some early LP12s:

1973 LP12 wiring diagram

In that case, it's probably just one of the caps that's causing the issue.

Chiltern
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Re: Systemdek I motor issue

Post by Chiltern » 05 Dec 2019 00:08

JaS wrote:
04 Dec 2019 19:17
Weird, someone answered your question but must have changed their minds? Anyway, the gist of it was that Systemdek probably used two caps and no resistor like in some early LP12s:

1973 LP12 wiring diagram

In that case, it's probably just one of the caps that's causing the issue.
Twas I, self doubt set in! On checking a Linn early simple supply the values differ from the OP's pics. Might be worth looking at an Ariston RD80 alternative circuit. Caps not expensive, and now around 40 years old so worth changing.

Alan
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mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 05 Dec 2019 09:13

I was looking at the Ariston RD80 wiring but it is different than i have in my systemdek. in the ariston motor has 2 (double wiered) connectors, systemdek has 3. and the ariston switch has 3 wires, systemdek 2. LP12 circuit looks more like systemdeck... but that is only mine unexperienced impression.

Chiltern
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Re: Systemdek I motor issue

Post by Chiltern » 05 Dec 2019 10:04

This post from 2014 seems to answer your question, and fit in with your pictures.

Alan

''Re: Motor Database

Post by gnik61 » 09 Apr 2014 04:50
Hi.It seems that every year they changed the capacitors or resistors in every version. I have a systemdek IIX 900 bought in 1994. It has an airpax motor 9904 111 31807 with a 680nf cap between red and blue wires (parallel) and one 330nf cap in series with the 680nf to live (230v).''

mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 06 Dec 2019 12:21

I'll definitely try that

mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 09 Dec 2019 09:28

quick update after few tests. I hope I've interpreted your hint correctly @Chiltern...
" It has an airpax motor 9904 111 31807 with a 680nf cap between red and blue wires (parallel) and one 330nf cap in series with the 680nf to live (230v).''

Now it is rotating ( i need to check if the RPM is correct) but there is a small issue. it keeps changing direction of rotation every time i switch it on and off. All 3 capacitors mentioned above are new so don't expect issues here. But what i discovered, there is also two small caps (0.01uf) attached to the switch itself... i really hope that is the solution. I have just ordered replacement caps.

Chiltern
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Re: Systemdek I motor issue

Post by Chiltern » 09 Dec 2019 10:11

mjolnirr wrote:
09 Dec 2019 09:28
there is also two small caps (0.01uf) attached to the switch itself... i really hope that is the solution. I have just ordered replacement caps.
The function of the small caps (0.01uf) is as supressors for the switch contacts, to stop any arcing and 'pops' as you switch on and off. They probably could do with replacing now but should not have any effect on your motor rotation, but you never know...

Are there 2 or 3 caps attached to the motor, not clear from your description. Pictured an early Linn simple circuit, the 2 blue caps 0.01uf for the switch, so only 2 caps in the motor circuit itself.

Alan
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mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 12 Dec 2019 08:46

Sorry i wasn't very clear... yes it is like on your image. It is rotating with right speeds (hurray) but it is still temperamental, it is changing direction every now and again. i am waiting for those switch caps to get delivered, these are the only to be replaced. but like you said it is unlikely these have an impact on rotation but that's my only hope.

mjolnirr
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Re: Systemdek I motor issue

Post by mjolnirr » 14 Dec 2019 17:36

:( I am giving up. I have now replaced all caps and still the same. It is randomly rotating one or the other way. Faulty motor ?!? Too pricey to replace

Alec124c41
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Re: Systemdek I motor issue

Post by Alec124c41 » 30 Dec 2019 23:31

Maybe if you give the platter a push in the right direction before switching it on?

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Re: Systemdek I motor issue

Post by abril » 31 Dec 2019 13:07

680nf parallel between coil lives is almost certainly wrong,values by the motor manufacture were botched - try 390nf instead.
There are other posts earlier in the Systemdek forum about precisely this issue.

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