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Pioneer PL-400 Strobe Issue

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Pioneer PL-400 Strobe Issue

Postby faintaxis » 19 Apr 2017 15:10

Hi all,

Apologies for the crossposting - I wasn't sure which forum I should post in! :D

I've picked up a cheap Pioneer PL-400 turntable. It had a few issues - some of which I think I've fixed - mostly with the control panel and the speed select switch.
I doused the speed select switch in contact cleaner and WD40 to loosen it up and now it latches properly. However, the turntable seems to have issues with 33rpm - the strobe lights seem to go steady at far too slow a speed for 33rpm. I can of course adjust the speed using the fine tuning controls underneath (which I also cleaned) but then the strobe is out (showing the record as spinning too fast).

Any ideas what could be going wrong?
faintaxis
 
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Re: Pioneer PL-400 Strobe Issue

Postby Coffee Phil » 20 Apr 2017 17:51

Hi Faintaxis,

Welcome to the forum.

The drive for your strobe is derived from the same quartz clock which controls turntable speed. What you describe should not be possible in quartz lock. Do you have a variable speed mode which you are using?

The manual is here: https://www.vinylengine.com/library/pio ... -400.shtml

Sorting this will take at least an oscilloscope and very high level electronics troubleshooting skill.

Do make the effort or find someone who can as this seems too nice a machine to dump.

Phil

faintaxis wrote:Hi all,

Apologies for the crossposting - I wasn't sure which forum I should post in! :D

I've picked up a cheap Pioneer PL-400 turntable. It had a few issues - some of which I think I've fixed - mostly with the control panel and the speed select switch.
I doused the speed select switch in contact cleaner and WD40 to loosen it up and now it latches properly. However, the turntable seems to have issues with 33rpm - the strobe lights seem to go steady at far too slow a speed for 33rpm. I can of course adjust the speed using the fine tuning controls underneath (which I also cleaned) but then the strobe is out (showing the record as spinning too fast).

Any ideas what could be going wrong?
Coffee Phil
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Re: Pioneer PL-400 Strobe Issue

Postby faintaxis » 21 Apr 2017 10:53

Hi Phil,

Thank you :)

The TT doesn't appear to have a pitch control on the control panel, just a speed switch (which I have replaced - it doesn't appear to make a difference).

I've read through the manual and service manuals but can't seem to find anything useful unfortunately. I've ordered a new power board as I've noticed this TT has a voltage selector which has had its wires cut, and the power transformer appears to be the wrong type (less output cables, and completely different model number to the manual)
faintaxis
 
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Joined: 16 Apr 2017 22:47

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