Studer A807 Motor Control Boards PROM's
Motor boards micro controller PROM for all Studer A807 motor boards
There are two different PROM's. One on the capstan motor board and two on the reel motors board.
Capstan PROM IC 9 part no. 1.727.331.20
Spool Motors PROM's IC15 and IC18 part no. 1.727.343.20
This IC is fresh burned by us on a NOS IC and is fully tested.
This IC often becomes faulty with age or possibly spikes due to capacitor degradation. A recap of PSU an the motors and tape transport modules should be done before replacing this IC. One of our electronic kits is highly recommended.
PLEASE NOTE VERY IMPORTANT. IC's, semiconductors and optics once purchased and delivered are non returnable. Replacing an IC or semiconductor into a dubious or possibly faulty machine can blow it as other problems may be present. All semiconductors are new and tested before they leave our facility. You are urged to do a full recap of your machine and then test all PSU voltages before troubleshooting and replacing any IC. I am happy to discuss your symptoms and try to help you diagnose problems before you purchase.