I'm working on a Pioneer PLX-500K TT for a friend. He said that the platter would not rotate. Based on threads in this forum and others, this seems to NOT be an isolated case. Replacement motor boards cost about as much as a new TT, so that's not an option. Besides, I'm enjoying the challenge of troubleshooting to find the root cause. I was an electromechanical engineering student, so I once had a solid grasp on the concepts involved, but that was 20 years ago and I haven't done much electronics work since then. It's nice to get familiar again. Luckily, I have a few experts from a university electronics lab helping me with advice on occasion. But they don't have much time to devote to my personal projects, so I'm mostly on my own.
I could document everything that we've done so far, but I don't want to clog up this thread (unless somebody specifically asks for that info). What I will note is that we tested nearly all components and they seem to be ok, except for the motor driver (BA6868FM). There was a short between pins 1 and 2. The driver was replaced but that didn't help. The motor coil pins (15-17) on the replacement chip had no output. We replaced the driver again, being very careful not to heat the chip too much. Still nothing. The driver was then replaced a 3rd time. Still no motor rotation.
We'd like to feed a proper drive signal to the motor board to determine if the problem is with the motor board or with the main board IC. It seems that main-board IC pins 25 (DRI1) and 18 (FRS1) output a signal to the motor board IC pins 10 (EC) and 11 (ED/S) respectively. If we can supply that signal and there is no output at the motor coil pins, then the problem is likely still the motor driver chip.
I know it's a long shot, but does anybody know what those signals feeding pins 10 and 11 on the motor driver look like?
I could document everything that we've done so far, but I don't want to clog up this thread (unless somebody specifically asks for that info). What I will note is that we tested nearly all components and they seem to be ok, except for the motor driver (BA6868FM). There was a short between pins 1 and 2. The driver was replaced but that didn't help. The motor coil pins (15-17) on the replacement chip had no output. We replaced the driver again, being very careful not to heat the chip too much. Still nothing. The driver was then replaced a 3rd time. Still no motor rotation.
We'd like to feed a proper drive signal to the motor board to determine if the problem is with the motor board or with the main board IC. It seems that main-board IC pins 25 (DRI1) and 18 (FRS1) output a signal to the motor board IC pins 10 (EC) and 11 (ED/S) respectively. If we can supply that signal and there is no output at the motor coil pins, then the problem is likely still the motor driver chip.
I know it's a long shot, but does anybody know what those signals feeding pins 10 and 11 on the motor driver look like?
Warranty?
This is indeed a know problem and Pioneer is very much aware of it.
They should replace the board even if the warranty has expired as this is a common defect.
But I'm not Pioneer. 🙂
Hugo
This is indeed a know problem and Pioneer is very much aware of it.
They should replace the board even if the warranty has expired as this is a common defect.
But I'm not Pioneer. 🙂
Hugo
My friend bought the turntable years ago, so we both assumed that Pioneer won't do anything. I suppose it can't hurt for him to at least ask them for a replacement.
The motor is 3 phase?
Not an answer to your question but maybe an alternative solution:
Use Arduino Simple FOC.
Not an answer to your question but maybe an alternative solution:
Use Arduino Simple FOC.
