Radio Shack TRS-80 Model 1 Troubleshooting Part 1

For a limited time, use the link in my description to get a free trial of Skillshare Premium Membership: https://skl.sh/janbeta09201 In this video, I'm troubleshooting the Radio Shack TRS-80 Model 1 Level II, taking a closer look at the power supply issues, the Z80 processor and the video circuitry among many other things. This video is part of the #SepTandy 2020 festivites. Other participants are: Mr Lurch's Things: https://www.youtube.com/mrlurchsthings Josh Malone: https://www.youtube.com/channel/UCjU4lK6YTMKnMj7-XgTsv9w The Retro Channel: https://www.youtube.com/TheRetroChannel Adrian's Digital Basement: https://www.youtube.com/AdriansDigitalBasement DaveJustDave: https://youtube.com/mrdavejustdave MindFlareRetro: https://www.youtube.com/MindFlareRetro Tech Tangents: https://www.youtube.com/AkBKukU Retro Spector: https://www.youtube.com/c/RetroSpector78 LGR: https://www.youtube.com/LazyGameReviews I highly recommend checking these people out if you haven't done so already! Here's a playlist of all SepTandy 2020 videos that is regularly updated: https://www.youtube.com/playlist?list=PLxbeEn-s3xXCVnEwkqSUOxyKZnsBEdv1r Replacement power supply schematics: https://github.com/calphool/TRS80MXS/blob/master/img/powersupply.pdf The excellent TRS-80 technical manual is available for download here: http://www.1000bit.it/support/manuali/trs/TRS-80%20Technical%20Manual%20%281978%29%28Radio%20Shack%29%28pdf%29.pdf This video was sponsored by Skillshare. TIME STAMPS: 0:00 Introduction 2:14 Removing the Keyboard 3:24 Sponsor Message 4:16 Power Supply Troubleshooting 27:17 The embarrassing fault! 31:36 Troubleshooting 32:57 Scoping the Z80 Processor 36:23 Scoping the Video Circuit 40:00 Checking Jumper Settings Z71 41:18 Rainbows! 41:54 Lowercase Mod Deconstruction 49:53 More video circuitry troubleshooting 55:58 Conclusion and Outlook ----------------------------------------­------ MUSIC by FOCUS 10 https://focus10music.bandcamp.com EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * TWITTER: https://twitter.com/thejanbeta PATREON: https://patreon.com/janbeta WEBSITE: https://www.janbeta.net TWITCH: https://www.twitch.tv/thejanbeta LBRY: https://open.lbry.com/@janbeta:b YT CHANNEL MEMBERSHIP: https://www.youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join Thanks for watching! * Stuff marked with "*" contains affiliate links. You don't pay anything extra and I get a little commission from everything you buy through the links (even if you buy something different there). #JanBeta #TRS80