Jan Beta | Radio Shack TRS-80 Model 1 Troubleshooting Part 1 @JanBeta | Uploaded September 2020 | Updated October 2024, 1 hour ago.
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: youtube.com/mrlurchsthings
Josh Malone: youtube.com/channel/UCjU4lK6YTMKnMj7-XgTsv9w
The Retro Channel: youtube.com/TheRetroChannel
Adrian's Digital Basement: youtube.com/AdriansDigitalBasement
DaveJustDave: youtube.com/mrdavejustdave
MindFlareRetro: youtube.com/MindFlareRetro
Tech Tangents: youtube.com/AkBKukU
Retro Spector: youtube.com/c/RetroSpector78
LGR: 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: youtube.com/playlist?list=PLxbeEn-s3xXCVnEwkqSUOxyKZnsBEdv1r

Replacement power supply schematics: 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

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