Troubleshooting a Sony PS-3750 very fast speed cannot be controlled 

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for now I can't do it . I already send this turntable to the owner.

but if your problem is the speed please check first the or clean first the speed adjust potentiometer for 45 and 33 rpm.

Hello po sir sorry wala po. Best nyo po gawin is hanap kayo ng the same model then swap nyo ang parts. Kasi kung motor lang po mahirap maghanap ng parts lalo na kung motor lang. Try nyo sa mga Japan surplus stores.

Yes clean and check first the potentiometers resistance reading. Dont touch the detector head you can clean but dont unscrew. Check transistors or replace transistors.

thank you sir

Recap first then check the 2 speed adjust potentiometer maybe it needs cleaning only. Next is to check the trimmer for 33 and 45 rpm inside located in the circuit board. Last is to test all transistor drivers. Here I have a link of this unit maybe it will help you www.audioservicemanuals.com/s/sony/sony-ps/12864801-sony-ps-3300-service-manual

Thank you very much sir..

Really?

first step clean the speed potentionmeters, second the trimmers inside, third check or replace the transistors in the speed circuit area. hope it helps you.

not all turntables has the same circuits just check the drivers of your turntables.