ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello all. So far this forum has been very helpful in restoring my newly acquired 4002. I have a new drive belt installed, and have followed through with Beolover's detailed instructions both here and on you tube for cleaning the tone arm mechanisms and adjustments.
I have successfully achieved a rotating platter, all lights work, the tone arm will lift and lower properly, however during initial adjustment I would have to manually turn the carriage motor until it moved enough to engage the lights and rotate the platter. Pressing the "inward" button had no effect, but the "Outward" button would function all the way to the home position.
As I turned screws and made tone arm adjustments, suddenly the carriage took off as if to read the distance and reset itself. Then the "Start" button would work as would the manual inward button and it appeared to be fully functional.
So I completed the tone arm adjustments, put both the drive and carriage belts back on, assembled the unit, plugged it back in with an album on the platter and now the "Start" function is back to not working again. If I manually rotate the carriage motor until the lights come on, the platter rotates and the tone arm will raise and lower, but if I lower to an album and let it play, it will not adjust itself along the tracking.
I can still raise the arm, return the carriage to home, the tracking light down under the tone arm is on, but it will not start.
Is there some reset function I accidentally engaged while making adjustments? Why did it suddenly come to life and work as it should (including the tracking of the carriage motor), and then when I re-assembled it it went back to it;s failure to start?
Any and all assistance is greatly appreciated.
So I think I may have located the problem. Behind the ruler looking piece that appears to tell the carriage where the arm position is in relation to a 12" or a 7" disc, there is what looks like an led that is directed toward what I assume is a photo sensitive plate on the other stuff of the clear acrylic slide.
If it is, in fact, an led, it isn't putting out any light.
Thinking that if it did, then the photo sensitive resistor would energize and allow function of the carriage, AND function of the tracking adjustor.
Because the arm will raise and lower, will raise of the inward button is pushed, and when the micro switch is engaged at the end of a record and also when the STOP button is pushed, I have to think that everything it won't do (start, track inward, or tracking adjustment when the needle has moved with the groves of a record), would be due to this light being out.
Like I said earlier, when I was initially adjusting things, or suddenly took off and tracked all the way in, and then back out to home, and then all functions were working. But after re assembly it returned to this current state.
Thoughts?
Ok I don't know why this worked, but I assembled most of the top, less the small access panel and the lid, set my phone inside with the flashlight on, held the start button and moved the flashlight around over the photo sensitive thing on the ruler, and damn if it didn't resume full function! Everything works perfectly.
Removed the flashlight, un plugged, hooked up to my pre amp, plugged it back in, and with no flashlight now it works.
All I can guess is it may have been exposed to too much sunlight while I had it open and working on it? Does that piece need to be in the dark?
Anyway....count me pleased!!!
All I can guess is it may have been exposed to too much sunlight while 🎭 had it open and working on it? Does that piece need to be in the dark?
pawfan: If it is, in fact, an led, it isn't putting out any light.
You can't see IR light.
Martin
Ahhhh....so it's an IRLED. Thank you for that very valuable information. Now I know why there aren't a lot of videos on replacing that one. I know nearly nothing about infrared, but since it seems to be working now in a darker room with the cover plates on, I guess having it in the garage with lots of sunlight and everything exposed interfered with the diode or the sensor for the diode? (I still don't know why the cellphone flashlight seemed to trigger it, but it did and I'm glad).
Info to add to this thread just in case:
Last thing after a slight adjustment to the tracking sensor (the stylus would set down on the disc a hair to early), was figuring why the ruler part would hit the bottom mounting bracket at the right end. The motor would bind up and it had no shut off for this so I had to hit START again to reverse it. I found the rear hangar bracket for the main floating base plate had loosened the adjustment bolt on the frame. Once I tightened that it raised the floating assembly and everything is working perfectly for the first time.
I was then finally able to do a comparison between this 4002 and my ELAC, setting everything up sound-wise and then simply swapping the same record from platter to platter. I am very pleased with the 4002 and the superior sound quality over what is considered to be a respectable unit in the ELAC. I'm not even going to try and compare with my Sansui or Stanton. Looks like some turntables will be listed soon.
Thanks again!