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This player has developed a mechanical problem which is driving me nuts & I'm still hunting for the cause.It plays CD's no problem. However, when cold, as soon as the LD get up to speed, it screams its head off - sounds like a slipping belt except there are no belts in there. After awhile, as the unit warms up the screeching vanishes. I fact if the unit is very warm at the start (courtesy of sunshine) then it behaves impeccably. I tried putting a small amount of light machine oil in both upper & lower clamp assemblies but all that did was to spray it around everywhere with noise unabated.
I've pulled off the cover many times and the problem appears to be either in the lower motor assembly or the upper clamp. Trying to dampen the noise by applying pressure to various sections does influence, but not eliminate, the noise at the top clamping assembly.
Any inmates experienced a similar problem?Could anyone suggest a knowlegable tech I could contact?
I have been in touch with Theta but they only referred me to the Sydney agent some 500 miles away & across water from me. If I could narrow down the problem & obtain the appropriate part(s) from Pioneer (another problem is to locate the part numbers) then maybe the local guys could handle it if it is beyond me.
Any assistance or advice would be most appreciated.
John
Its the ceramic main bearing pressed into the motor shaft - no fix except to replace the motor.
I'll try to locate the part number & import it. While I'm at it are there any other parts which would benefit from replacement? I have a large collection of operatic, ballet etc LD's & wish to play them for a long time to come so had better stock up on spares while they are still available.I'm very grateful for your advice Scott. Makes this asylum really valuable.
John
Hi John - I didn't have time this morning for a more verbose reply so here is a little more information for you. As you know the Theta III is based on the cld-704 chassis. It was reported in SGHT that Theta made picked the 704 because all of the more robust cld-97 chassis left available were bought up by Macintosh for their pioneer-based LD player. However I tend to believe that the 704 was chosen because it has superior resolution over the 97 (704 = aprox 460 lines horiz resolution vs. aprox 425 lines of the 97) and a more reliable side turn mechanism. Pioneer hand-tunes the elites for superior color saturation which lowers the resolution slightly from the 450 line standard. Factory tolerances on the 704 were incredibly tight and a 704 in good condition can slightly exceed the 450 line standard. The 704 is superior to the 97 IMO (I have owned both).Aside from the obvious HD chassis and faceplate, the Theta III has a propriatary audio board of excellent quality and upgraded analog and digital power supplies. The motor assembly is standard 704 and is prone to main bearing failure. It is a readily available part, not too expensive, but must be installed by a tech you trust who is very experienced with Pioneer LD mechanisms as it is major surgery and can affect laser alignment, disc table timing and the gamma turn flip subsystems if it is not done correctly. I am not sure that I would trust anyone other than Theta to perform the work and would surely consult with them before risking damage to so fine a player!
Good luck,
Scott
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