My snarky reply aside, in all seriousness...I discovered that I have one of those terminals.
As others have said it could be the display circuit transformer's power but not if it's a "beep" vs. a "squeal". If you are getting a continuous beep it could be that you have a stuck key, I'd verify that by carefully detaching the keyboard from the main board (with the power off) and then powering on. If the beep is gone check your keyboard. Assuming it's not a stuck key, I'd guess you have a motherboard logic error. I'd carefully remove the ROMS one at a time and then start testing chips. Here is mine https://www.vintagecomputer.net/televideo/TVI-912C/Televideo_TVI-912C_pre-restore.jpg Bill On Wed, Sep 14, 2022 at 12:33 PM Peter Coghlan via cctalk < [email protected]> wrote: > Mike Loewen wrote: > > On Wed, 14 Sep 2022, Jonathan Katz via cctalk wrote: > > > >> I have a TVI-921C at the museum. I power it on and it beeps > >> continuously. One long, solid tone that does not stop until I power it > >> off. How do I start diagnosing this? > > > > Check the power supply voltages. > > > > After checking the voltages, if it has a microprocessor, check if it is > being > held reset and if the clock is running. > > If it is a big lump of logic, it would probably be a lot easier to deal > with if you can find some sort of service manual / circuit diagram / > circuit description. > > Regards, > Peter Coghlan. >
