Vinyl Turntable Malfunction: Rotation Issue
Amazing
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vincs83 -
vincs83 -
Hello,
I just bought a used BST brand turntable, model 436, direct drive (so no belt, with quite a high torque).
It worked perfectly for 3 days.
But today, when I turn it on, it's not working:
In stop or play (start/pause button), the platter does not turn.
In fact, it stabilizes when stopped, meaning that if I turn it myself, it will slow down and then oscillate for 5 seconds back to its stop position. The adjustable brake is not working either.
What I just described happens all the time, in pause or play mode, with the pitch at all positions, in reverse mode, with or without the aluminum platter,...
The only time it turns "freely" is when it's OFF or unplugged, if I turn it myself of course.
This gives me the impression that it might be related to the oscillator if there is one (I don't know how a turntable works but there should be a speed controller).
I haven't tried much, just unplugging it several times and shaking it slightly.
That's my problem, I hope I am clear enough.
Thank you for your help...
I just bought a used BST brand turntable, model 436, direct drive (so no belt, with quite a high torque).
It worked perfectly for 3 days.
But today, when I turn it on, it's not working:
In stop or play (start/pause button), the platter does not turn.
In fact, it stabilizes when stopped, meaning that if I turn it myself, it will slow down and then oscillate for 5 seconds back to its stop position. The adjustable brake is not working either.
What I just described happens all the time, in pause or play mode, with the pitch at all positions, in reverse mode, with or without the aluminum platter,...
The only time it turns "freely" is when it's OFF or unplugged, if I turn it myself of course.
This gives me the impression that it might be related to the oscillator if there is one (I don't know how a turntable works but there should be a speed controller).
I haven't tried much, just unplugging it several times and shaking it slightly.
That's my problem, I hope I am clear enough.
Thank you for your help...
Configuration: Windows Vista Internet Explorer 7.0
7 answers
Hello
Contact BST and explain your problem to them.
It's one of the solutions
@++
--
Don't panic, it will come soon!!!!!
Contact BST and explain your problem to them.
It's one of the solutions
@++
--
Don't panic, it will come soon!!!!!
Hello
I will explain my problem again, more clearly:
I have a BST 436 turntable, belt drive, high torque.
It was working very well (I use it for scratching), but now here’s what happens:
When the turntable is powered on, whether the Start/pause button is pressed or not, the motor does not turn, instead, it stabilizes on an axis.
>>>>>>>>>>See figure 1: http://www.abc-electronique.com/forum/attachment.php?attachmentid=15437
This happens regardless of the buttons pressed: pitch, quartz lock, reverse, speed, brake speed...
Today, I took apart the turntable.
At first glance, no burnt components, loose wires, etc....
>>>>>>>>>>See figure 1: http://www.abc-electronique.com/forum/attachment.php?attachmentid=15438
However, when the turntable is powered on, one component (an integrated circuit) located under a heatsink gets extremely hot, to the point that the heatsink becomes burning. I think this component is the driver, as it is located on the motor control circuit board. Maybe this is normal?
Additionally, I noticed some test points and some kind of "forced" connections on the main board. But since I have no documentation on this type of circuit, I don’t know where to start.
Thank you for your help.
I will explain my problem again, more clearly:
I have a BST 436 turntable, belt drive, high torque.
It was working very well (I use it for scratching), but now here’s what happens:
When the turntable is powered on, whether the Start/pause button is pressed or not, the motor does not turn, instead, it stabilizes on an axis.
>>>>>>>>>>See figure 1: http://www.abc-electronique.com/forum/attachment.php?attachmentid=15437
This happens regardless of the buttons pressed: pitch, quartz lock, reverse, speed, brake speed...
Today, I took apart the turntable.
At first glance, no burnt components, loose wires, etc....
>>>>>>>>>>See figure 1: http://www.abc-electronique.com/forum/attachment.php?attachmentid=15438
However, when the turntable is powered on, one component (an integrated circuit) located under a heatsink gets extremely hot, to the point that the heatsink becomes burning. I think this component is the driver, as it is located on the motor control circuit board. Maybe this is normal?
Additionally, I noticed some test points and some kind of "forced" connections on the main board. But since I have no documentation on this type of circuit, I don’t know where to start.
Thank you for your help.
Hi, I also have a BST 436 and this problem just happened to me today!!! However, is yours direct drive and mine belt drive??? I turn it on, the platter spins but the start, pause, and reverse buttons don't control much anymore! It stops and doesn't start again, etc. If you resolved your issue, thanks for letting me know; I would hate to throw it away. Thanks in advance!!
Ah! Finally, someone this happens to!
Well, the problem has been resolved in another forum, http://abcelectronique.com/forum/showthread.php?t=44800&page=1&pp=10, you should read it...
To summarize: this turntable MUST NOT be used on an ungrounded outlet. Did you make this mistake? Electrostatic shocks damage an electronic component (a "driver") because it is no longer protected by grounding. Do you remember if the vinyl's lighting weakened before?
The solution? Start by replacing the TA7259 component; it is a driver (an electronic component that directly controls the motor). To do this, open the turntable from the bottom, look for the TA7259 component (it's a large integrated circuit with 2 big legs in the middle; it is located on the board that supports the turntable motor). In fact, it is hidden under a heatsink, the large aluminum piece you see in the photo below (marked C.I.).
http://abcelectronique.com/forum/attachment.php?attachmentid=15438
Unscrew the heatsink, and you will find the component! Be careful, there's thermal paste on it (which helps dissipate heat), it can stain your clothes...
You will need to order the same one; if you are lucky like me, you might find an electronics store that can order it. Otherwise, I don't think you'll find it online. Finally, desolder the old TA7259 component (using desoldering braid is handy) and replace it with the new one in the correct orientation (use a soldering iron connected to the ground, this component is very sensitive to static electricity!!). I advise you to find someone with a background in electronics or soldering; however, it's not too difficult to do, you won’t risk much.
Then, replace the heatsink, reassemble the turntable, and it should work again!! I did this operation 5 times before discovering that my turntable was not grounded... so definitely use a grounded outlet! If you don't have one at home, just sell your turntable...
Well, the problem has been resolved in another forum, http://abcelectronique.com/forum/showthread.php?t=44800&page=1&pp=10, you should read it...
To summarize: this turntable MUST NOT be used on an ungrounded outlet. Did you make this mistake? Electrostatic shocks damage an electronic component (a "driver") because it is no longer protected by grounding. Do you remember if the vinyl's lighting weakened before?
The solution? Start by replacing the TA7259 component; it is a driver (an electronic component that directly controls the motor). To do this, open the turntable from the bottom, look for the TA7259 component (it's a large integrated circuit with 2 big legs in the middle; it is located on the board that supports the turntable motor). In fact, it is hidden under a heatsink, the large aluminum piece you see in the photo below (marked C.I.).
http://abcelectronique.com/forum/attachment.php?attachmentid=15438
Unscrew the heatsink, and you will find the component! Be careful, there's thermal paste on it (which helps dissipate heat), it can stain your clothes...
You will need to order the same one; if you are lucky like me, you might find an electronics store that can order it. Otherwise, I don't think you'll find it online. Finally, desolder the old TA7259 component (using desoldering braid is handy) and replace it with the new one in the correct orientation (use a soldering iron connected to the ground, this component is very sensitive to static electricity!!). I advise you to find someone with a background in electronics or soldering; however, it's not too difficult to do, you won’t risk much.
Then, replace the heatsink, reassemble the turntable, and it should work again!! I did this operation 5 times before discovering that my turntable was not grounded... so definitely use a grounded outlet! If you don't have one at home, just sell your turntable...
I'm assuming you're not on MSN. I'm in the process of dismantling my turntable and I found the driver. How can I check if it's faulty? Yeah, I have the ground at home; otherwise, you can hear it crackle when the turntable is running! Reply to me.
This problem happened to me too on my BST436. As a result, it's always broken and I don't know what to do. I also don't have a grounding socket at my place.
I’ve already looked on the internet and I can only find super sketchy sites! I need to find a store where they might be able to order it for me! In any case, I took apart this component and three other little resistors are really black! :-s
Hello,
I think I may have had the same problem as you, but with a Numark TT500. I believe this turntable has the same driver component as the BST, as it uses a TA7259P.
However, I did not have any resistors that burned out. I had to replace this component to repair the turntable. Do you have any clear photos showing the driver and the resistors in question?
I think I may have had the same problem as you, but with a Numark TT500. I believe this turntable has the same driver component as the BST, as it uses a TA7259P.
However, I did not have any resistors that burned out. I had to replace this component to repair the turntable. Do you have any clear photos showing the driver and the resistors in question?
I'm taking photos tomorrow! Because I reassembled my turntable yesterday to avoid losing any parts! Is it correct that it's the TA7259P driver or where can you find it??? It seems pretty complex to resolder it!? Anyway, thanks for the answers!
Here are the photos, hoping they will help you find the problem with my turntable because I must admit that I miss scratching...!!! Awaiting your response, best regards, Vincent.
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_2.jpg
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_4.jpg
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_8.jpg
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_2.jpg
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_4.jpg
C:\Users\vincent\Desktop\probleme platine 2\Snapshot_20090512_8.jpg