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209.136.24.246
Of late I've been having mistracking problems with my PR-3. They started up between one cleaning and the next just out of the blue. Instead of tracking in a smooth continuous arc across the record it jerks across in fits and starts, obviously leaving the record alternately wet and dry. Additionally, I have noticed that at certain points of travel, it will tend to push the thread that the suction device rides on slightly out in front of the suction head and that slack will develop in the thread. Lifting the arm immediately causes the thread to pull tight again and recenter, only to see the same thing begin again thereafter. I've played with tracking force a little to no avail and am skunked as to any other potential remedy. And no, I haven't contacted Smart Devices yet because I place more stock in the timeliness and experience/skill level of fora such as this one than the seller. TIA.
Follow Ups:
way down in the bowels of the beast there is a strap that holds the motor in place so that as it turns it's magnets the magnets will turn the arm smoothly. during shipping the motor had come loose from this strap and was not interacting with the arm properly so the arm would not move. once i could see what was wrong by disassembling the whole thing it was quick work to put it right. it is a bit tricky and tight to get at this but do-able.this was 8 months ago so i can't recall the exact steps to disassemble but it was quite straight-forward (and i'm relatively all thumbs). re-assembly was easy and all is perfect.
even though it was frustrating at the time to get a brand new unit with a problem the event did allow me to see the build quality and give me confindence that i can easily repair the Loricraft.
mikel
Thanks for your input. What you describe seems to fit the situation better than SD's explanation, frankly. Because their explanation is an easy one to initiate, I'll try it first, naturally. But I have a hunch I'll be opening up the bastard sooner or later.
As Garth says, the arm travel in an arc by means of a motor. At the base of the arm pivot, there's a magnetic clutch (well, that's what Loricraft calls it). You might try to lift the arm and clean the contacts.As for the thread running some slack, I don't think that's anything to worry about. It happens with my Keith Monks all the time.
Cheers,Ivan
"What's neo-realism?" "No money."
don't forget the arm is not driven by the grooves it is driven by the motor. So if it is not traveling correctly across the record surface (I think tracking and mistracking are the wrong terms here) it has something to do with the motor or more likely the clutch assembly.Try switching the arm on, pick it up and move it to the end of the record and switch it off again. then try running the arm on the "back side" of the lp, IE the inner half and let the arm run from the inside to the outside of the lp.
Should have mentioned that I have also been cleaning of late from the center of the record outward toward the lead-in groove since this problem started. It has somewhat ameliorated things but not adequately. There are three operational switches on the plinth of the machine..."motor"..."arm"...and "pump". The motor spins the platter only (it seems), the arm switch propels the arm by whatever means (not magnetically, I think, as another respondant noted) and I think we can all surmise what the pump switch does. I have tried moving the arm to different locations, turning off the arm switch and then returning the arm to rest and then firing up the arm switch again. It's a crude attempt at doing a reset, so to speak. But whatever, I haven't hit on the magic formula yet.
The arm clutch is a bit "tricky" it seems at times for me too. I haven't had any real problems but there does seem to be a "right" place for the arm/motor/clutch relationship.Have you tried to simply hold the arm in the air on the farside leadout groove and wait until it "catches" and let it travel outwards?
I don't have it but you could try eMailing Terry at Loricraft.
In answer to your question, yes. Essentially i have tried many ways to "re-sync" the arm and its "drive" assmebly. However, new developments may render all of this moot.Hat in hand, I decided to go ahead and call SMART Devices. I spoke to Norm, their Mr. Loricraft, per se. He said the problem is definitely attributable to having the discharge bottle positioned in such a way as to cause the large hose running from arm to bottle to put downward pressure on the counterweight causing periods of lift on the arm. I must say that I'm skeptical of this in my particular case as I have paid a lot of attention to bottle orientation and how it affects VTF already but I guess I'll have another looksee. BTW he did also mention that magnetics are in some way involved in the arm travel. Won't go into details here. Thanks to all respondants.
I thought it was magnets that pulled the arm across the record.Regards LPH.
I am not sure of the exact nature of the clutch assembly. It could be magnetic.
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