Hello,
I am working on this Technics SP-15 from hell. It is trowing problems at me for a while now and the last one is again a special one.
After stop turning during a disc change a couple weeks ago, I have found a donor SL-1300MK2 and I had to replace both DN860 and AN640. Luckily the donor SL-1300MK2 had working parts.
Now that I've got it back spinning again, I see that it does not stop properly. Once I hit Start/Stop button with any of the speeds selected, it slows down but starts turning backwards and forwards a couple times before it comes to a complete halt. I should mention that, I have already performed all the necessary adjustments (the voltages, the current, the tracking) according to the service manual. The Brake pot seems to be fine.
As this very turntable was built in hell, the service manual does not include this problem in the trouble shooting section. Trying to outsmart the sadistic Technics engineers, I have downloaded the service manuals of other direct drive turntables i.e. SL-1200, SL-1300, etc and none of them mention such a behavior as if it shouldn't have happened.
I was wondering if anybody here has/had a tough luck like mine?
Best,
Dirk
I am working on this Technics SP-15 from hell. It is trowing problems at me for a while now and the last one is again a special one.
After stop turning during a disc change a couple weeks ago, I have found a donor SL-1300MK2 and I had to replace both DN860 and AN640. Luckily the donor SL-1300MK2 had working parts.
Now that I've got it back spinning again, I see that it does not stop properly. Once I hit Start/Stop button with any of the speeds selected, it slows down but starts turning backwards and forwards a couple times before it comes to a complete halt. I should mention that, I have already performed all the necessary adjustments (the voltages, the current, the tracking) according to the service manual. The Brake pot seems to be fine.
As this very turntable was built in hell, the service manual does not include this problem in the trouble shooting section. Trying to outsmart the sadistic Technics engineers, I have downloaded the service manuals of other direct drive turntables i.e. SL-1200, SL-1300, etc and none of them mention such a behavior as if it shouldn't have happened.
I was wondering if anybody here has/had a tough luck like mine?
Best,
Dirk
Last edited:
Solved!
If anybody reading this with a problematic brake symptom like it is described above, the solution is to check D201 or C201. If the diode is not functioning properly or the capacitor value is an "over-achiever" type, then you can have jerky or erratic brake function. Replace those and you should be food to go!
/Dirk
If anybody reading this with a problematic brake symptom like it is described above, the solution is to check D201 or C201. If the diode is not functioning properly or the capacitor value is an "over-achiever" type, then you can have jerky or erratic brake function. Replace those and you should be food to go!
/Dirk