Nothing for Heath or Bell and Howell on BAMA, which is always worth checking, you might have some joy with this:
https://puck.nether.net/mailman/listinfo/heath
https://puck.nether.net/pipermail/heath/
I've no experience of them, but possibly worth a shot?
https://puck.nether.net/mailman/listinfo/heath
https://puck.nether.net/pipermail/heath/
I've no experience of them, but possibly worth a shot?
You have probaly found this site already Heathkit Schematic Diagram Archive
The closest model number is IO-4550
The closest model number is IO-4550
Have you downloaded the 4550 to compare to your unit? If they are very similar, it may be enough. Even if they are quite different, it may be that the section of the unit you are servicing may be similar or the same as some other model. Many product lines have "family resemblance" within the model range.
Good news and bad news. Good: I built that scope (Heathkit IO-4540 5MHz single-trace) as a teenager, and I still have both the scope and the manual, complete with schematic. Bad: I don't own a scanner, and even if I did, the schematic is a 31" x 20" single sheet. But I hung it on the wall and took a photo of each quadrant, and they're fairly readable at 100%. Hope it helps.
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