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Fixed Sony PS-X75 with an Arduino Mega Board

M

MKB-No1

New Member
SONY PS-X75 with blown MB8841-209L microchip fixed with a Arduino Mega2560 Board.

A long, long time ago in 1980’s Sony produced one of the best automatic record players the Sony PS-X75.

The only problem was the main Microprocessor (IC) was prone to breaking. Our Sony had a broken IC and no one manufactures these anymore and you can't buy secondhand chips either.

We searched the galaxy for a replacement and couldn't find one.

I reversed engineered the chip using Sony PS-X75 Service Manual and programmed a £30 Arduino Mega board to replace all the functions of the main IC chip.

The linked video below for some could be a bit boring but the heart surgery to replace the main chip with an Arduino Mega board WORKED !

All functions are now FULLY Restored using an Arduino software program called Embrio.

All the following works:
Auto Play
Record Size Detection
Auto drop
Auto Stop
Button start / stop
Button up/down
Buttons forward and backwards
Repeat
Speed selection
No record detection
Home arm detection
Stylus force and bias
All lights and buttons
Auto arm up and home on startup, auto play and stop.
New External USB fitted to upload config changed to Arduino.
New light sensor board made for record size detection as main board one was randomly working.
New LED light fitted.
Added a 9v transformer to power the Arduino when the Sony is turned on.

Enjoy

 
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I love, love this! I consider this the logical solution for when unobtanium chips fail—where there’s a will there’s a way.
Thanks for sharing.
 
This has to be one of the coolest fixes/upgrades I've ever seen! Kudos to you sir!

Forgive me if I am being ridiculously naive because I simply have zero knowledge on these things, but with this new "brain" that is Arduino inside, is it possible to remote control all the operations? Especially since now there is a USB port to the board, could a USB receiver be used so that the receiver could be placed outside of the turntable to avoid interference with audio? Or am I just dreaming....
 
leakingwater said:
This has to be one of the coolest fixes/upgrades I've ever seen! Kudos to you sir!

Forgive me if I am being ridiculously naive because I simply have zero knowledge on these things, but with this new "brain" that is Arduino inside, is it possible to remote control all the operations? Especially since now there is a USB port to the board, could a USB receiver be used so that the receiver could be placed outside of the turntable to avoid interference with audio? Or am I just dreaming....
Click to expand...

absolutely possible to control the machine remote with either wired or wireless as the Arduino is now controlling all the movements. Arduino's have all sorts of modules including WiFi, Bluetooth, infrared sensors all could be added and programmed to send signals to Arduino to control remotely the TT.

Wired through USB was how I coded and tested from my main machine. I could from my computer make the turntable do anything the front buttons were being programmed to do.

The only area that I’d go nowhere near would be sound from stylus to phono out as that needs to be pure and doesn’t touch the Arduino / old IC.

Thank you for your comments.
 
Brilliant! This is a great way to save equipment with a blown processor. You just need to be able to write firmware.
 
This sounds absolutely amazing with the Goldring 1042 cartridge fitted - its OMG working/sounding so beautiful.

 
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