diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Analogue Source (http://www.diyaudio.com/forums/analogue-source/)
-   -   Technics SP 10 Speed Problems (http://www.diyaudio.com/forums/analogue-source/27559-technics-sp-10-speed-problems.html)

rollinr 4th February 2004 07:52 PM

Technics SP 10 Speed Problems
 
I have enjoyed my Technics SP 10 Mk II for many years. Recently though, it began to...what sounded like...loose sync. It would
wow momentarily, then resume at speed. Slowly, the wows became more frequent, and then, it stopped running at any correct speed alltogether. It spins very fast...faster than 78 rpm.
Any ideas from the most knowlwdgable diy members or gurus?
Thanks!

Netlist 4th February 2004 09:49 PM

2 Attachment(s)
Rollinr,
I don't know the SP10 but if it has the same electronics as the SL1200 I could maybe help you.
If not, ignore this post.

/Hugo :)

Elso Kwak 4th February 2004 10:04 PM

Re: Technics SP 10 Speed Problems
 
Quote:

Originally posted by rollinr
I have enjoyed my Technics SP 10 Mk II for many years. Recently though, it began to...what sounded like...loose sync. It would
wow momentarily, then resume at speed. Slowly, the wows became more frequent, and then, it stopped running at any correct speed alltogether. It spins very fast...faster than 78 rpm.
Any ideas from the most knowlwdgable diy members or gurus?
Thanks!


Hi rollinr,
The two SP10's I repaired had detoriated powersupply electrolytic caps. Some were even at the point of bursting!
I replaced all electrolytics in the remote powersupply and it worked fine again. I first searched in the speed control circuit but ended in the powersupply. Especially the capacitor that gets slightly warm was very bad.
:cool:

moamps 4th February 2004 11:15 PM

Re: Technics SP 10 Speed Problems
 
Quote:

Originally posted by rollinr
[B]I have enjoyed my Technics SP 10 Mk II for many years. Recently though, it began to...what sounded like...loose sync.
Hi,
I have service manual for SP10 in pdf, but it is huge. (5-6Mb). If your mailbox is large enough, just mail me the address.

Quote:

Originally posted by Netlist
I don't know the SP10 but if it has the same electronics as the SL1200 I could maybe help you.
Those turntables have completely different electronics.

Regards

rollinr 4th February 2004 11:56 PM

SP 10 help
 
Thanks netlist, fof the offer, but the SP 10 is really a different animal. There are 4 (at least) circuit boards under the platter that are populated by scores of ICs...then there's the outboard power supply!

Elso, I'll give your idea a try. Replacing 20 year old caps couldn't hurt! Was runaway speed the problem you had encountered?

Netlist, thanks for the offer of the manual!

Warmest Rs

rollinr

Elso Kwak 5th February 2004 08:06 AM

Re: SP 10 help
 
Quote:

Originally posted by rollinr
Elso, I'll give your idea a try. Replacing 20 year old caps couldn't hurt! Was runaway speed the problem you had encountered?
Warmest Rs

rollinr


Hi,
Yes and very irregular movement of the platter as there was a huge ripple on the supply.:cool:

Panelhead 12th February 2004 10:13 PM

Re: Re: Technics SP 10 Speed Problems
 
Quote:

Originally posted by Elso Kwak



Hi rollinr,
The two SP10's I repaired had detoriated powersupply electrolytic caps. Some were even at the point of bursting!
I replaced all electrolytics in the remote powersupply and it worked fine again. I first searched in the speed control circuit but ended in the powersupply. Especially the capacitor that gets slightly warm was very bad.
:cool:

Elso,
Somehow I have ended up with a mint SP 10 Mk II, a mint SP 10 Mk I, and a ragged out ex radio station MkII.
The Mk II locks and never drifts. The Mk I wanders a lot. The ragged one does not have a working strobe, speed selection switch, or other nicities.
I assume you fixed two Mk II's. I have never looked inside the remote box. How many caps are in there?

George

Elso Kwak 12th February 2004 10:29 PM

Re: Re: Re: Technics SP 10 Speed Problems
 
Quote:

Originally posted by Panelhead


Elso,
Somehow I have ended up with a mint SP 10 Mk II, a mint SP 10 Mk I, and a ragged out ex radio station MkII.
The Mk II locks and never drifts. The Mk I wanders a lot. The ragged one does not have a working strobe, speed selection switch, or other nicities.
I assume you fixed two Mk II's. I have never looked inside the remote box. How many caps are in there?

George

Hi George,
No I repaired only Mk I's. There are a handful of electrolytics inside. Just have a look. The bad ones have bursted or convex rubbers. Strobe lights also burn out in the long run.
:cool:

rollinr 13th February 2004 12:14 AM

SP 10 MK II
 
Trusting that replacing the caps will solve my speed problems, I move on to the burned out strobe in my SP 10. Does anyone know a supplier for these apparently high end neon lamps. Is the voltage the same as a small night light style neon? Any ideas? Thanks!

Rollin

Elso Kwak 13th February 2004 10:00 AM

Re: SP 10 MK II
 
Quote:

Originally posted by rollinr
Trusting that replacing the caps will solve my speed problems, I move on to the burned out strobe in my SP 10. Does anyone know a supplier for these apparently high end neon lamps. Is the voltage the same as a small night light style neon? Any ideas? Thanks!

Rollin

Hi Rollin,
I replaced the neon lamp by a smaller standard bulb.
It did not last as long as the original lamp.
With some modification a ultra bright LED would work perhaps.
:idea:


All times are GMT. The time now is 11:36 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2