On 2022-09-14 1:06 p.m., Sellam Abraham via cctalk wrote:
Lots of Televideo docs scanned thanks to good old Al ==>
https://bitsavers.computerhistory.org/pdf/televideo/
Nothing for the 921 but there is an operator's manual for the 922 which may
shed some light on what the continuous beep might mean.
I have the "Televideo 912/920" service binder but I know it has stuff
for other models inside. There is a similar binder on bitsavers I
thought, but each one is probably slightly different. I can check inside
it to see if there's anything relevant.
(I own a TVI-920B.
https://www.flickr.com/photos/qu1j0t3/37328445552/in/photolist-2ms1g25-ZKXCwz-ZHeUUw-YFfEiC-ZveVwW-ZaeiZm-ZveFZA-YSAJ5Y-YSA3mQ-XQyMpE-XQyzYd-BPejR7-P2zGrL-P2tdPo
)
--Toby
Sellam
On Wed, Sep 14, 2022 at 9:33 AM Peter Coghlan via cctalk <
cctalk@classiccmp.org> 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.
