So, I've scoured the web for some information on this.
It seems no one is really sure how to get these back to spec, at least, not in detail.
I attempted to fix this via the luxman service bulletin (copy available on vinylengine: also attached to this post) which recommends that I do all these adjustments from beneath the table. Being a ridiculously heavy table, awkward situation and being upside down, I believe I made adjustments to the wrong trim pot.... 😕 I moved it back to its original place but I'm not sure if its precise. This was quite a while ago and I just got frustrated and moved the thing into a closet....
But its such a pity to see such a beautiful turntable go to waste.... Previously it was locking on 45rpm and from the little I listened it made my sp-10 hang its head in shame.
Since theres no detailed thread on getting this thing back to spec, I figure its a good project as I see many other people out there are having the same issue and due to lack of information, a repair manual, etc. they are becoming really nice paperweights.
I'm not very technically inclined, I was just trying to follow the directions. I can solder and use a multi-meter, but don't ask me to wax poetic on schematics.
I've uploaded some images of the underside of the turntable and all the other info I've been able to scour off the web.
It seems no one is really sure how to get these back to spec, at least, not in detail.
I attempted to fix this via the luxman service bulletin (copy available on vinylengine: also attached to this post) which recommends that I do all these adjustments from beneath the table. Being a ridiculously heavy table, awkward situation and being upside down, I believe I made adjustments to the wrong trim pot.... 😕 I moved it back to its original place but I'm not sure if its precise. This was quite a while ago and I just got frustrated and moved the thing into a closet....
But its such a pity to see such a beautiful turntable go to waste.... Previously it was locking on 45rpm and from the little I listened it made my sp-10 hang its head in shame.
Since theres no detailed thread on getting this thing back to spec, I figure its a good project as I see many other people out there are having the same issue and due to lack of information, a repair manual, etc. they are becoming really nice paperweights.
I'm not very technically inclined, I was just trying to follow the directions. I can solder and use a multi-meter, but don't ask me to wax poetic on schematics.
I've uploaded some images of the underside of the turntable and all the other info I've been able to scour off the web.
Attachments
Old post, but I thought I'd respond anyway. I have a PD-441 that had the same problem, speeds wouldn't lock in. I've had this table for over 30 years and when I first got it, the speeds would lock, but not consistently and I could hear what sounded to me as cogging. Drove me crazy so I put the table in storage. Just recently I took it out of mothballs and turned it on and to my dismay, neither 33 or 45 speeds would lock at all. Lock indicator lamp just kept flashing. I did not have the service bulletin at the time, but I removed the bottom cover anyway and started twiddling the pots randomly until I got the lock indicator to lock on for both speeds. I used a digital tachometer that I found on eBay to check the speeds and they were both spot on. Listened to some vinyl (first time in over 30 years!) and was very happy to note the cogging was gone and all there was was sweet music. Dang, I miss listening to vinyl. Guess I still have analog ears in a digital world, lol.🙂
I know that this is an old thread but I was able to fix the speed instability on my Luxman PD-441 by tuning the speed pots VR-01 and VR-02. I did VR-01 first and after a lot of trial and error I was able to get the 33 rpm speed light (blue) locked. I then went to VR-02 to tune the 45 rpm. Same deal...a lot of trial and error but finally got it locked (solid red). Not an easy task as I actually had to continuall flip the table over to make an adjustment, and then return it to upright to test. Make sure that you put the platter back on every time that you go to test the speed. You can damage the motor if you don't. I am very happy that I was able to get this corrected. The table is a beauty...runs silently and the speed is really locked in now. Hope this helps someone who has one of these beautiful tables and is struggling with speed instability.