EMS 256 Sequencer Repair Part 4

video upload by Really Nice Audio

All parts

"In this episode we edge closer to getting this legend back in full working order. Now I have my extender cards I can probe the circuits and start debugging the rest of the faults.
After checking around the recirculation circuits and shift registers I decided to remove the 'Time Extender Board'. Now it plays back recordings!
I have to do some more research on this board in the next episode.

Thank you
https://www.pcbway.com
for making the extender boards. They were perfect!

This EMS 256 is part of Pete Townshend synth collection at
https://www.uwl.ac.uk/study/study-fac..."

EMS 256 Sequencer Repair Part 3

video upload by Really Nice Audio

"I socketed all the IC's and tested what I could. Found almost 20 faulty IC's through this process. Thanks to PCBWay for making my extender boards. If my design is correct I will share the design on PCBWay so all the thousands of people that need to fix their 256's can order their own.

This 256 is part of the Pete Townshend Synth collection housed at the University Of West London. https://www.uwl.ac.uk/study/study-fac..."

EMS 256 Sequencer Repair Part 2 Re-Cap circuit cards and devising a plan.

video upload by Really Nice Audio

Really Nice Audio EMS 256 Sequencer posts

"What is the likelihood due you think I will get this sequencer fully functional? I am now able to see the memory fill up when using a key input. The hardest thing for me to work out was a strategy for the repair. Considering how old this unit is will I find many broken logic IC's?

It is hoping to play some music in September, let me know your thoughts below.
https://paymentportal.uwl.ac.uk/confe...

This is part of the Pete Townshend Synth Collection at the University Of West London

https://www.uwl.ac.uk/study/study-fac..."

EMS 256 Sequencer Repair Part 1

video upload by Really Nice Audio

Really Nice Audio EMS 256 Sequencer posts

"Join me in a quest to get this incredible sequencer back up and running.

It is part of the Pete Townshend Synth Collection at the University of West London
https://www.uwl.ac.uk/study/study-fac..."

SN 6014

EMS Synthi Sequencer256 For Sale

flickr set by rick403
(click for more)

This is for sale. If interested contact echo7even at yahoo.com

"Rare EMS Digital Sequencer - 1971

3 Layers (or tracks) with Key Voltage, Velocity Voltage and Key (gate)

4th layer called "Key 4" is a trigger control track used for system clock control (stop/reset) etc.

Before repair and restoration."

inside an EMS Sequencer 256