How to lubricate disc-type motor in SONY walkmans

Thank you Valentin, I appreciate you taking the time to listen. It is probably as good as it will get at this point so I’ll move on!

 

Hi Valentin,

I was under the impression that injecting watch oil through the plastic membrane on the other side of the motor would lubricate the shaft. Am I wrong? See attached pic.

That part of the motor is even made easily accessible from the outside without having to disassemble the Walkman. If not for lubrication, then what would be the purpose of making it easily accessible?

 

That plastic membrane is part of the bushing, it's there to keep the motor shaft at the correct height.
Don't know why on some motors it is made of transparent plastic, but it's not for oiling.
Piercing it to add oil will alter its geometry and also oil will tend to sip out through that hole.

Unfortunately there is no other way to oil the motor apart from disassembly.

 

Thank you! I successfully disassembled the motor of another unit (a Sony WM-600 Walkman) and lubricated it with watch oil, following your tutorial. I carefully removed the glue from the edges of the PCB using an X-Acto knife, which allowed the PCB to come off easily. When reassembling, I used tiny drops of PVA glue, which hold the PCB securely while remaining easy to remove in the future. It took a lot of patience, but it was worth it! A strong magnifying lens was invaluable in helping me avoid cutting the PCB traces.

 

Quick question here. I have two WM-10RVs that I am working on. I disassembled the motors from the top but upon re-assembly, they both make very faint scratching noises when I spin them and there seems to be more friction that before I lubed them. Is there a trick to re-assembly that I may be missing?

 

Noticed that faint scratching noise in WM-700 series motors myself, it's audible when the motor comes down to a halt.
When it's rotated as higher speed by hand, it's not noticeable. Not sure where it comes from, but seen it so many motors incline to believe it's normal.
What I'm reffering to is also not related to lubrication, this noise existed before/after.

As for the friction, it's normal to be a tiny bit more friction because of the oil's surface tension.
If after rotating the motor by hand it doesn't stop immdiately, it's fine.