UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Audio (record players, hi-fi etc)

Notices

Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

Reply
 
Thread Tools
Old 18th Sep 2019, 11:32 am   #1
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 4,252
Default Dual Turntable motor fault.

Hi
I thought I'd eventually have a look at my old Dual 505 turntable which stopped working years ago. After replacing the microswitch (O/C) and the RIFA capacitors, the motor trembles but doesn't turn. Both coils measure around 1.8k and it spins freely. Motors aren't my strong point - is there anything I can do?
Attached Thumbnails
Click image for larger version

Name:	IMG_0022 (Small).JPG
Views:	101
Size:	63.2 KB
ID:	190419   Click image for larger version

Name:	IMG_0024 (Small).JPG
Views:	92
Size:	57.8 KB
ID:	190420   Click image for larger version

Name:	IMG_0025 (Small).JPG
Views:	92
Size:	68.6 KB
ID:	190421  
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline   Reply With Quote
Old 18th Sep 2019, 9:19 pm   #2
wowitsanamstrad
Diode
 
Join Date: Sep 2019
Location: Manchester, UK.
Posts: 1
Default Re: Dual Turntable motor fault.

replacing the capacitors usually sorts the motor,
wowitsanamstrad is offline   Reply With Quote
Old 18th Sep 2019, 9:52 pm   #3
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 13,567
Default Re: Dual Turntable motor fault.

Does it spin up if you "kickstart" it?
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is online now   Reply With Quote
Old 18th Sep 2019, 11:51 pm   #4
Michael Maurice
Moderator
 
Michael Maurice's Avatar
 
Join Date: Feb 2006
Location: Wembley, Middlesex
Posts: 5,687
Default Re: Dual Turntable motor fault.

Quote:
Originally Posted by wowitsanamstrad View Post
replacing the capacitors usually sorts the motor,
He's replaced the capacitors. See post #1
__________________
Forum Moderator

http://www.michaelmauricerepairs.co.uk/
Michael Maurice is offline   Reply With Quote
Old 19th Sep 2019, 11:08 am   #5
Herald1360
Dekatron
 
Herald1360's Avatar
 
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 13,567
Default Re: Dual Turntable motor fault.

You might have a shorted turn on one of the motor windings which wouldn't show up on a resistance check. Try inductance checks or a "ring" test if you can do them.
__________________
....__________
....|____||__|__\_____
.=.| _---\__|__|_---_|.
.........O..Chris....O
Herald1360 is online now   Reply With Quote
Old 19th Sep 2019, 12:18 pm   #6
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 4,252
Default Re: Dual Turntable motor fault.

The reason I got it out of its slumber is that another identical turntable has come in for a simple repair. So I think a bit of swapping is in order!
Yo answer your question, it stubbornly sits there trembling.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline   Reply With Quote
Old 19th Sep 2019, 12:42 pm   #7
Diabolical Artificer
Dekatron
 
Diabolical Artificer's Avatar
 
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 4,607
Default Re: Dual Turntable motor fault.

Have you re- checked your connections Glyn? Also did you use the right value caps and they're not actually snubbers, lastly make sure the caps you subbed are ok and not shorted or leaky. Short of that try a different value of cap.

Andy.
__________________
Curiosity hasn't killed this cat...so far.
Diabolical Artificer is offline   Reply With Quote
Old 19th Sep 2019, 1:12 pm   #8
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 4,252
Default Re: Dual Turntable motor fault.

Hmm.
When I put my motor in the good turntable it spins merrily BUT soon there's an unpleasant smell and the feed resistor (5k1, 5W W/W) is unhappy. This runs relatively cool in the customer's machine. Oddly, my board won't spin his motor at all! Confused at this point, but as it seems my motor is duff anyway there's not much point in going further.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline   Reply With Quote
Old 19th Sep 2019, 1:16 pm   #9
Beobloke
Hexode
 
Join Date: Oct 2007
Location: Southampton, Hampshire, UK.
Posts: 362
Default Re: Dual Turntable motor fault.

It sounds like you have motor troubles but, as an aside, I always replace all the components on any of these that I service. The resistor runs hot and eventally the coating burns off and it stinks the whole time, plus one of the capacitors has a tendency to explode when it gets old!

A complete kit of compoenents is available on a "well known auction website" for only 9 which makes it a no-brainer in my book.
Beobloke is offline   Reply With Quote
Old 19th Sep 2019, 5:18 pm   #10
Norman Raeburn
Hexode
 
Join Date: Feb 2008
Location: Leven, Fife, Scotland
Posts: 418
Default Re: Dual Turntable motor fault.

Hi Glyn, I have a scrap 505 which I believe the motor is ok. You are welcome to try it foc. Just let me know. Norman
Norman Raeburn is offline   Reply With Quote
Old 20th Sep 2019, 1:31 pm   #11
Welsh Anorak
Dekatron
 
Welsh Anorak's Avatar
 
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 4,252
Default Re: Dual Turntable motor fault.

That's very kind of you, Norman, I'd appreciate that as I'd already invested in the capacitors, a stylus and belt before I realised it was the motor.
I'll send you my details via PM.
__________________
Glyn
www.gdelectronics.wales
Welsh Anorak is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 12:56 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2019, Paul Stenning.