TRS-80 REPAIRS
About this page!
This is the main landing page for TRS-80 Repair Related subpages.
This page is also very much under construction. The Wordpress to HTML dropped all of these, so I need to build the concept based on now orphaned pages!
General
Start Here - A page with a general troubleshooting guide and prior Q&A's
Model I
Model I Hardware Parts, Repairs, and Improvements
Includes instructions on using a composite monitor instead of the TRS-80 monitor, building your own Model I power supply, and a case for a bare expansion interface board.
Model I Hardware Repair Videos
Videos on How to fix Video Sync Issues on the Model I, How to Connect a Model I to a Composite Monitor, Removing an ALPS Key Switch from a Model I, and the Expansion Interface Click Test Explained.
Model III
Model III Hardware Parts, Repairs, and Improvements
Information about Power Supply, RAM, Badges, Keyboard, Video/Keyboard, Power Connector Assembly, Paint, and Feet
An article on how to self-repair a Model III/4 TRS-80 power supply by Michael Lohmeyer.
Model III/4 Hardware Repair Videos
Videos on Fixing Stuck Brightness/Contrast on a Model III or 4, How to Fit a Model III Hi-Res Board in a Model 4, How to Test the RS-232C Port on a Model III and 4, How to Upgrade the CRT in a Model III and 4, Model III and 4 Checks Before Powering Up, Repairing a Model 4 Serial Port, Upgrading RAM Badge on a Model III/4, and What to look For When Buying a Model III or 4
Model 4
Model 4 Hardware Parts, Repairs, and Improvements
Information about Model 4/4D/4P replacement Power Supply, External Video/Keyboard Card, RAM, and Feet
An article on how to repair a Model 4 Membrane-Based (ALPS) Keyboard by Jim Wildgren
An article on how to self-repair a Model III/4 TRS-80 power supply by Michael Lohmeyer.
Model III/4 Hardware Repair Videos
Videos on Fixing Stuck Brightness/Contrast on a Model III or 4, How to Fit a Model III Hi-Res Board in a Model 4, How to Test the RS-232C Port on a Model III and 4, How to Upgrade the CRT in a Model III and 4, Model III and 4 Checks Before Powering Up, Repairing a Model 4 Serial Port, Upgrading RAM Badge on a Model III/4, and What to look For When Buying a Model III or 4
Accessories / Add-ons
Information about replacement badges and feet, a Model I Hard Disk Adapter Board, the Lo-Tech TRS-80 IDE Adapter, the FreHD Hard Drive Emulator, and some repair videos.
Replacement batteris and PC-1 Repair Videos.
Upgrades / Updates from the Modern Era
Information on current parts which can be purchased to upgrade a real TRS-80. They include memory cards, RS-232 cards, Talker, NewPrint (print over WiFi), NewKey (keyboard/joystick adapter), Hi-Res for Model 4, TRSNic (WiFi for III/4), TRS-IO for the Model III (Wifi, TCP, SMB), MISE (Model I Expansion Interface Replacement), and more.
Information related to the cassette drive. Includes instruction on making a Model I/III TRS-80 Cassette Interface Cable and a way to use a PC in lieu of the Tape Recorder.
Information covering 4 modern floppy-drive replacements: Gotek, Floppy-80 (no FDC required), HxC Floppy Drive Emulator, and the MxS for the Model I.