Turntable - Reverse Motor - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 22nd July 2009, 08:21 PM   #1
diyAudio Member
 
Join Date: Jul 2009
Default Turntable - Reverse Motor

I know how to do this with a basic stamp to tell the motor to input the electricity backwards but I don't have one at my disposal, so how would I get my motor to reverse play?

I can get into the internals easy enough and I can find the electricity wires, but I just don't know what I would do once I un-soldered it. I remember double throw switches but I forgot how to operate one.

Anyone mind helping me out? Thanks
  Reply With Quote
Old 22nd July 2009, 08:44 PM   #2
diyAudio Member
 
directdriver's Avatar
 
Join Date: Nov 2005
I am also looking for a way to make the platter on my Technics SL-1200mk2 to go in reverse so I can turn it into a "direct-coupling" motor to rim drive another platter a la Teres Verus motor. Any idea anyone? I would appreciate the help.
  Reply With Quote
Old 26th July 2009, 02:06 AM   #3
diyAudio Member
 
Join Date: Jul 2009
Default Reversing direction on SL 1200

Could turn it upside down that would do the job!!!
I have had a look at the circuit diagram for the control circuits for the driver coils. It could be done by reversing the rotation of the drives to the motor coils from the AN6675 drive IC. But then you would also need to reverse sense coils, it all gets very complicated!!

It is not the type of mod to undertake unless you are a competent electronis person the amount of switching required is not simple and any mistake would cause the control IC to die very quickly.
  Reply With Quote
Old 12th August 2009, 08:25 PM   #4
johnf1 is offline johnf1  United Kingdom
diyAudio Member
 
Join Date: Aug 2009
Default Reverse

It is a Very simple task. before I explain Hi there.
You will be able to reverse the motor or any motor, but there is a simple check before you do this, check to see what type of conacts internally if it is brushes, you must smooth the ragged edges before allowing the motor to reverse ye, just reverse the + and N - terminals and the motor will reverse at the same forward speed. only reverse the polariy exactly at the motor, you could do this by a double pole switch depending on application, hope this has'nt put a spanner in your plans.
  Reply With Quote
Old 12th August 2009, 10:21 PM   #5
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
The SL1200 used an electronically commutated 3 phase motor. No brushes in sight!
As Nimbus said, you have to swap the connections of two of the three drive coil phases.
Along with that, you'd have to switch the phase pickup coils that detect the phase rotation sequence.
It's not *difficult* but you have to understand how the DD motor works so you don't damage it.

Have you got the schematic (circuit diagram) ?
__________________
Steerpike's Toybox
  Reply With Quote
Old 26th August 2009, 10:31 PM   #6
diyAudio Member
 
directdriver's Avatar
 
Join Date: Nov 2005
I decided to give up on the Technics, they all have a tendency to rock back and forth. I have moved on to Pioneer turntables. Less torque but more reliable. I would like to know how to make the motor run in reverse on the PL-570. Schematics can be downloaded from Vinyl Engine.
http://www.vinylengine.com/library/pioneer/pl-570.shtml

Or PL-L1000
http://www.vinylengine.com/library/p...pl-l1000.shtml

Thanks for any help in advance!
  Reply With Quote
Old 27th August 2009, 12:28 AM   #7
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
On Assembly PWX 006, PL570

Swap pin 13/14 - drive to motor coil B/C

Swap pin 10/5 - Hall phase detection C+/B+
Swap pin 3/7 - Hall phase detection C-/B-

(If the motor does not run smoothly, restore the swapped connnection 13/14, and swap 12/13 instead. If that doesnt't work, restore 12/13 and swap 12/14. One of the 3 will work. The schematic doesn't show precisely the rotation sequence, so it has to be a guess.)
Attached Images
File Type: gif pion.gif (14.0 KB, 176 views)
__________________
Steerpike's Toybox

Last edited by Steerpike; 27th August 2009 at 12:32 AM.
  Reply With Quote
Old 28th August 2009, 03:35 AM   #8
diyAudio Member
 
directdriver's Avatar
 
Join Date: Nov 2005
Thank you for your help!

If I apply the same concept to the PL-L1000, a later model that has the FG frequency generator wires from the motor to the drive board, will it work as well?

Thanks again for the direction.
  Reply With Quote
Old 28th August 2009, 11:26 AM   #9
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
Yes, the FG is not involved in direction control - it doesnt need to be messed with.
The PL570 also uses an FG, associated with Q1 & Q2 and Q5 = PD100ia
__________________
Steerpike's Toybox
  Reply With Quote
Old 28th August 2009, 03:44 PM   #10
diyAudio Member
 
directdriver's Avatar
 
Join Date: Nov 2005
Thanks for the reply.

I was thinking about the "FG" from the motor typically feature in turntables of this era as pointed in the schematic of a Pioneer PL-500, that I don't see in the PL-570.
Attached Images
File Type: jpg PL500.jpg (313.9 KB, 150 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help required for using a FDD motor as a turntable motor. binspaul Analogue Source 5 13th May 2009 03:59 AM
WTD - DC turntable motor + controller copydex Swap Meet 0 12th December 2008 07:54 PM
LRK motor for Turntable? pixpop Analogue Source 1 17th June 2007 03:30 AM
AR XA Turntable - WTB Motor bluemt Swap Meet 0 27th December 2005 05:37 PM
Motor for turntable. Tomek Analogue Source 33 9th October 2003 11:29 PM


New To Site? Need Help?

All times are GMT. The time now is 12:09 PM.


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