PL 530 Question...

nadude98

nadude98

7MGTE Power!
It was suggested I post this here instead of the Pioneer Forum so here goes... crossposting..

I recently had a PL 530 returned that was damaged in shipping.
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The box took a major hit. The long story short is that whatever happened has caused the motor to quit working. The buyer took it apart and looked at it before sending it back and said it looked like it had a bad cap and that dropping it may have caused it to go bad. Sounded funky to me.. I couldn't remember for sure but I had also thought I had recapped it when I picked it up about 4 years ago.. sure enough when I got it back I saw it had all new caps and also verified that the motor no longer works. I don't get it, as the table was part of the living room stereo and was used regularly and was working when I boxed the unit. I am going to have to part it out and would like to find out for sure why it no longer works... any ideas. Seems to power up.. strobe illuminates and tonearm motor was trying to work..
 
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Neah, I don't buy the busted cap theory either. Impact damage may cause the motor to bind. Then, trying to run it, is what actually kills it. Of course, impact can crack PCB's, kill solder joints, break loose wires, etc... I would follow section 8 (ops) and 9 (trouble shoot) in the service manual and verify the motor windings are intact. Hopefully, they are, and you'll be able to trace the fault.
 
tnsilver said:
Neah, I don't buy the busted cap theory either. Impact damage may cause the motor to bind. Then, trying to run it, is what actually kills it. Of course, impact can crack PCB's, kill solder joints, break loose wires, etc... I would follow section 8 (ops) and 9 (trouble shoot) in the service manual and verify the motor windings are intact. Hopefully, they are, and you'll be able to trace the fault.
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K, thanks!
 
One thing, you should never ship a TT in a U-Haul storage box. Not made for that. I have my double wall boxes made for any table I ship. Never had one damaged in shipping.
 
I'm assuming this is the mid-70's PL-530. The center shaft of the arm is plastic, held in place by only 2 screws. Very bad design if you ask me. Very easy to damage.
 
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gary7 said:
One thing, you should never ship a TT in a U-Haul storage box. Not made for that. I have my double wall boxes made for any table I ship. Never had one damaged in shipping.
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It was an electronics moving box which is pretty heavy duty. Plus it was lined 3 1" sheets of styrofoam wall insulation... I am a retired USPS mailhandler and used to handling a lot of packages. It took one hell of a hit to puncture that box!
Yeah pretty poor design..it was the knurled nuts in the tonearm that came loose..
 
When I opened it up I found out that yes and I had recapped the unit!
Found the issue...after I checked the motor for proper continuity I checked the power coming into the motor control board. There was no voltage. I then checked the power supply board at the zener and I had my 18vdc, then checked Q1 at the emitter and had 18vdc. I'm thinking what the hell so I take the board loose and turn it over. I'm not sure how it happened but the power supply board had a crack that ran the full width of the board in a straight line almost perfectly in the middle. It had separated the trace from Q1's emitter in two places on the boards. I scrapped off the coating on the traces on both sides of the broken traces, fluxed the area and took some leads that had been cut off of caps from previous projects and bent them about 3 times and soldered them to the traces. Motor works fine!

Now I am a little aggravated at myself for parting it out. Though to be real, with the broken tonearm I think it was beyond my abilities to repair.. I have 3 or 4 semi or automatic turntables here now that are just setting because trying to take them apart and get them going intimidates me!

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