Sony HMK 20 - UK Vintage Radio Repair and Restoration Discussion Forum

ReverendBlack · 22nd Jun 2022, 12:14 pm

Hello. Just purchased a Sony HMK 20 & the turntable makes a terrible noise when a speed is engaged. I need to investigate but can't see how the turntable platter removes. Can anyone advise?

ReverendBlack · 22nd Jun 2022, 12:38 pm

Scratch that, it was just gummed up with crud so I've been able to remove it. The motor is quiet, but when a speed is engaged & the spinning wheel meets the post (sorry for lack of technical terminology) there's a noise which in turn, travels up to the stylus & speakers. Any advice in a repair?

Edward Huggins · 22nd Jun 2022, 5:29 pm

What you are calling a "Post" is the Spindle coming up from the motor. Clean that and the edge pf the Idler Wheel ("Spinning Wheel") wiih IPA. Also check the motor mounts as the suspension may have degraded/weakend over time.

ben · 22nd Jun 2022, 6:21 pm

Lightly oil the shaft of the idler wheel and platter. Be careful not to get opil on the platter or idler itself

22nd Jun 2022, 12:14 pm	#1
ReverendBlack Diode Join Date: Jun 2022 Location: Oldham, Greater Manchester, UK. Posts: 2	Sony HMK 20 Hello. Just purchased a Sony HMK 20 & the turntable makes a terrible noise when a speed is engaged. I need to investigate but can't see how the turntable platter removes. Can anyone advise?

22nd Jun 2022, 12:38 pm	#2
ReverendBlack Diode Join Date: Jun 2022 Location: Oldham, Greater Manchester, UK. Posts: 2	Re: Sony HMK 20 Scratch that, it was just gummed up with crud so I've been able to remove it. The motor is quiet, but when a speed is engaged & the spinning wheel meets the post (sorry for lack of technical terminology) there's a noise which in turn, travels up to the stylus & speakers. Any advice in a repair?

22nd Jun 2022, 5:29 pm	#3
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,338	Re: Sony HMK 20 What you are calling a "Post" is the Spindle coming up from the motor. Clean that and the edge pf the Idler Wheel ("Spinning Wheel") wiih IPA. Also check the motor mounts as the suspension may have degraded/weakend over time. __________________ Edward.

22nd Jun 2022, 6:21 pm	#4
ben Dekatron Join Date: Aug 2006 Location: Madrid, Spain / Wirral, UK Posts: 7,498	Re: Sony HMK 20 Lightly oil the shaft of the idler wheel and platter. Be careful not to get opil on the platter or idler itself __________________ Regards, Ben.