Mr. Yamaha
Not so much Yamaha lately...
Hi there, I have this amazing Yamaha YP-D8 playing for some time, but since last Sunday the RPM is not stable. It spins stable, then falls back in RPM for 2 seconds, speeds up again, etc. When I remove the platter, the spindle is turning 1 second, then pauses, spins 1 second, pauses, etc.
Problem occurs in both speeds and the pitch knob(s) do not change the problem other then that it's changing the RPM as normal.
So that's odd. If it's the motor, then this table becomes instantly junk and that would be really sad
So I hope it's something else. It already has a none working auto-stop / auto-lift function which I was planning to fix. Very sophisticated system with no mechanical connection between the system and the tone arm. It works with a small sub arm which runs with the tone arm and at the end of the record the sub arm blocks the light of a LED which shines into a sensor. When completely blocked for a few seconds, the output voltage of the sensor increases and 'tells' an actuator to lift arm after going through a 'discrimination' section.
Everything works up to the increasing voltage of the sensor according to specs, so it must be the actuator or the discrimination board.
Anyway, I'm not sure what whether the unstable RPM has something to do with the auto-stop / auto-lift function.
Any idea where to start?
Problem occurs in both speeds and the pitch knob(s) do not change the problem other then that it's changing the RPM as normal.
So that's odd. If it's the motor, then this table becomes instantly junk and that would be really sad
So I hope it's something else. It already has a none working auto-stop / auto-lift function which I was planning to fix. Very sophisticated system with no mechanical connection between the system and the tone arm. It works with a small sub arm which runs with the tone arm and at the end of the record the sub arm blocks the light of a LED which shines into a sensor. When completely blocked for a few seconds, the output voltage of the sensor increases and 'tells' an actuator to lift arm after going through a 'discrimination' section.
Everything works up to the increasing voltage of the sensor according to specs, so it must be the actuator or the discrimination board.
Anyway, I'm not sure what whether the unstable RPM has something to do with the auto-stop / auto-lift function.
Any idea where to start?