In 1977 three consumer-friendly microcomputers were released...the Commodore Pet 2001, the Apple II and the TRS-80 Model 1 (Level 1 BASIC, 4k RAM). Up until now I never had any of these three "original" models but rather variants that came a year or two later. Until now.
I've been given a 4k L1 TRS-80 Model 1. It comes with the original screen and tape deck and it's in good cosmetic condition. These are quite rare as most of these original models were upgraded to L2, 16k. The computer doesn't function though and I'm working my way through what's wrong.
The problem seems to be with power. The power pack is ok, but so far I've determined the 12 v line is shutting itself down. That in turn shuts down the 5v line. The -5 volt line seems ok.
I conclude that either one of the power transistors isn't working or there is a short on the board, Hopefully not the latter as these can be hard to find. Anyway, here is a pic of the fine looking circuit board. This repair project will progress in fits and starts as there is a lot going on in my life at the moment. I'll post updates though.
I'm expecting there to be other problems lurking once I get the power going. There always is..