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Pioneer Pl-300 Turntable Motor Jogging in Reverse Direction
Pioneer Pl-300 Turntable Motor Jogging in Reverse Direction
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Old 12th June 2021, 04:28 PM   #1
rob100961 is offline rob100961  United Kingdom
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Join Date: Nov 2012
Default Pioneer Pl-300 Turntable Motor Jogging in Reverse Direction

When the motor is switched on, it sort of jogs its way round in a back and forth motion, but overall in a reverse direction.

Please see the attached pictures of the motor/motor pcb, and the board it attaches to (power board) I can't see anything visually wrong, and the Service Manual I've downloaded isn't helping me much.

I only have a digital meter (no oscilloscope etc), so fault finding is difficult. I'd like to check the output voltages on the 7 pin connector first, but can't see this in the manual. Or is the fault more likely to be on the motor/motor pcb anyway, so I should concentrate there first.

Maybe replace all the electrolytic capacitors as a first step??

Thanks, Rob
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Old 12th June 2021, 09:45 PM   #2
duncan2 is offline duncan2  United Kingdom
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Join Date: Mar 2013
Location: Scotland.
Electrotanya has a better manual than vinyl engine but its still 3 big chips operating it in block diagrams .

If the fault isn't the mechanical start switch connection then without an oscilloscope on a crystal controlled DD motor then all you can do is test voltages at the chips.
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Old 14th June 2021, 09:51 AM   #3
starbender is offline starbender
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Join Date: Jun 2012
Location: Istanbul
Quote:
Originally Posted by rob100961 View Post
When the motor is switched on, it sort of jogs its way round in a back and forth motion, but overall in a reverse direction.

Please see the attached pictures of the motor/motor pcb, and the board it attaches to (power board) I can't see anything visually wrong, and the Service Manual I've downloaded isn't helping me much.

I only have a digital meter (no oscilloscope etc), so fault finding is difficult. I'd like to check the output voltages on the 7 pin connector first, but can't see this in the manual. Or is the fault more likely to be on the motor/motor pcb anyway, so I should concentrate there first.

Maybe replace all the electrolytic capacitors as a first step??

Thanks, Rob

Don't run motor without aluminium platter. When you run motor without platter, it will run back and forth and sometimes reverse. Put on platter and check.
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Old 14th June 2021, 04:33 PM   #4
rob100961 is offline rob100961  United Kingdom
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Join Date: Nov 2012
I will try all the above.

Thanks, Rob
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Old 14th June 2021, 06:42 PM   #5
rob100961 is offline rob100961  United Kingdom
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Join Date: Nov 2012
Put the platter back on, and it works a treat.
I'll put it all back together now :-)

Thanks for the helpful advice - I've made a note of it now.

Rob
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