14 Sep
2022
14 Sep
'22
9:55 a.m.
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-r…
Bill
On Wed, Sep 14, 2022 at 12:33 PM Peter Coghlan via cctalk <
cctalk(a)classiccmp.org> wrote:
Mike Loewen wrote:
On Wed, 14 Sep 2022, Jonathan Katz via cctalk
wrote:
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.
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.