hifi engine

Sansui P-L75 Tonearm drop speed

The tonearm moves across the record at recommended height of 5-6 mm then just drops to record without gently settling down on it. This ends up bouncing and doesn't seem normal.
Arm lifter and tone arm springs are in place. This started happening after I had to adjust the height of the tonearm above the record to keep the cartridge from dragging on the record.
I can't find anything in the service manual regarding adjustments for rate of drop for the tonearm. Is anyone familiar with this? Thanks.



Re: Sansui P-L75 Tonearm drop speed

The service manual is on Vinylengine. I haven't worked on a PL-75 in years but I think the procedure you want is there.

Re: Sansui P-L75 Tonearm drop speed

Hi. Thanks for your reply. I've been working with the service manual but no luck on drop speed. Do you remember if the arm is supposed to drop slowly/gently or if it just plops down when the arm lifter drops away.

Thanks.

p.s. Have had some trouble with my email account through hifiengine so may have missed an earlier reply.

Re: Sansui P-L75 Tonearm drop speed

The way you describe the dropping tone arm is NOT normal.
I'm wondering if you have a problem in the tone arm lifter circuit; it has a lifter solenoid that is controlled by 15 volts that comes from a two transistor circuit. It would appear that a capacitor charges slowly and the voltage should rise to 15 within a few seconds. This capacitor may be bad; it is labelled fc5 (10uf 16 volt).

Re: Sansui P-L75 Tonearm drop speed

Thanks. I'll check that.