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#1 Posted : Monday, June 27, 2022 5:17:36 AM(UTC)

Rank: Newbie

Groups: Registered
Joined: 5/6/2022(UTC)
Posts: 3
United Kingdom

Fixed a SONY PS-X75 Record Player (1980's) with a blown MB8841-209L microchip. Fixed it with a Arduino Mega2560 Board and the fabulous Embrio Software.

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 thanks to Embrio are now FULLY Restored using an Arduino Mega Board.

All the following works:
Auto Play
Record Size Detection
Auto drop
Auto Stop
Button start / stop
Button up/down
Buttons forward and backwards
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.


Youtube video of it working perfectly :)

Youtube of the build

Sony PS-X75 fixed with Embrio and Arduino Mega

New Light Recod Size Dector

Removed old IC chip from Deck

Wiring loom soldered and connected to Arduino

Embrio programmed Arduino in place of Micro Processor

Edited by user Thursday, July 14, 2022 5:11:03 AM(UTC)  | Reason: Not specified

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