Re: 465 Missing a Few Components
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Stephen,
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I don't quite have the equipment to scan the pre SN B250000 11x17 pages, but I can take photos and look up specifics for you. The A9 board has many board layout pages in the book. Each one highlights components from different sections: Horizontal Amp, CRT, Power Supply, etc. Please let me know what you need and I'll upload pictures. It's kind of a run-around to take and upload pictures, so a blanket dump would take a while. My phone takes pics that are several Meg in size, so I resize them down to something more on the order of several 100k. But it takes a bit of shenanigans to do. I don't want to blow up the groups disk space. When you say the fuse blows, are you talking about the main fuse, or F1419? F1419 is the one on the board that drives the HV transformer. Quite common that C1419 shorts and causes that. If the main fuse you're going to have to see if you can identify the short in the power rails. Do any of the power test points measure 0 ohms to ground? As you know, some of the A9 board diagrams are already in your TekScopes photo album. Let me know what's not covered that you think will help. Same with schematic pages. Dave On Thursday, April 8, 2021, 01:30:26 PM PDT, Stephen <stephen.nabet@...> wrote:
I finally started to electrically restore this apparently quite early 465. The 2 pass transistors have been replaced, as well as R1549, and C1549. Also, the 15V rail was shorted to ground because of a faulty tantalum on the horizontal amp board, but I don¡¯t know the number.? The schematic from TekWiki is not very good.? It¡¯s near impossible sometimes to make out the parts numbers. Also, some A9 board pictures do are quite different from the one I have. Could anyone with a legible picture send it to me offline, or post it in the photo folder, please? Now that I¡¯ve replaced what I could so far, I turn the unit on, and the line fuse blew instantly. I can¡¯t try to troubleshoot it with the documents I have available at this point. PS: No more of the rails are shorted to ground. |
Dave Peterson