#16
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Quote:
It looks like the picture is getting somewhat better |
#17
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Looking better. Where do you have your scope connected? Service info doesn't show waveforms so I couldn't say if it is correct.
Sams here for free: https://www.earlytelevision.org/pdf/..._sams_79-4.pdf and Riders: https://www.earlytelevision.org/pdf/...03_rider_3.pdf B2 sets the frequency and is not in parallel with a fixed cap. I'd definitely check all the associated resistors and caps in that circuit if you're still not able to get a lock. Don't trust those 220pF mica caps. |
#18
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They’ve been replaced with new 1% mica caps of the same value.
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#19
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#20
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The Riders has some great information on the specifics of the horizontal and vertical circuits including the components responsible for the sequential processing of the oscillator voltage in both. I just wish I could read the schematic! It's very blurry and the part designations are different from the readable Sams. It is, however, a great description of what happens in these circuits for a newbie like me.
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Audiokarma |
#21
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I would double check solder connections in and around anything horizontal if there is a joint that didn’t take it could be very annoying to back track to find but worth it if you find one.
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#22
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Ahhhh...you know the quality of my soldering well!!!
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#23
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No it’s not that I have made many mistakes and then having to go back and look over what I did and yes found many dumb mistakes I have made.
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#24
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__________________
=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために |
#25
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Lol well he is probing for a problem
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Audiokarma |
#26
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I hate to beat a dead horse but I was lucky to find a simple problem in my RCA 630TS where the horizontal was way off frequency. I found the Horiz Freq transformer cranked all the way to one end, probably to compensate for failing components. When I put new, on value parts in, the adjustments were rock solid and in the middle of the range. Just a thought. |
#27
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Absolutely! It's unusual to NOT need to make adjustments after recapping.
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#28
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The original Riders hardcopy is hard to read as well. Best we have unless someone has an original Crosley service manual.
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#29
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I had my scope connected right after the horizontal frequency trimmer. Probably the wrong spot but I do have a sawtooth at 15.75 kHz
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#30
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The horizontal frequency is actually 15,734.26573426573 Hz. Or rounded off 15.73 kHz
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Audiokarma |
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