ADM-3A Help?

Discuss construction, troubleshooting, and operation of the Altair 8800c computer

ADM-3A Help?

Postby toml_12953 » July 17th, 2022, 3:00 am

My ADM-3A stopped displaying video but I still hear a beep when I turn it on leading me to believe that the main board is working and I have a video problem.
I bought a refurbished Ball replacement CRT and electronics and am trying to install it in the ADM. However, I didn't mark the connectors before removing them.
The video board I removed and the replacement board have seven positions for Molex connectors but there are only have five Molex connectors coming from the ADM to
connect to it: Two from the flyback transformer, two from the coil on the neck of the CRT and one from a transformer on the plate that retains the video board. Would you
be able to tell me what ADM connectors go to what video board positions using the P101 - P107 designations from the maintenance manual?
toml_12953
 
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Re: ADM-3A Help?

Postby BillO » July 20th, 2022, 7:11 am

I wish I could help. The last time I sat in front of an ADM-3A was in high school. That was 47 years ago...
BillO
 
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Joined: November 11th, 2020, 6:29 am


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