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#31
12-15-2015, 07:44 PM
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i have a new dvom and is very sensitive and has diode check along with resistance and i get absolutely no reading whatsoever either side of either diode, i thought i would get something, well i guess if they were good and i do trust my dvom but i get nothing,lol...
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#32
12-15-2015, 08:43 PM
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I am dropping 6 of them in the mail to you tomorrow. I tested them good. Let's see how your meter tests them.
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#33
12-20-2015, 09:59 AM
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Ok upon taking the old 1n34 diode out I made sure of where the line is on the diode and put the new one with the line in the same position, facing down so I now have strong loud and super clear audio but no picture although I have several caps coming to change yet because it looks like a possible vert and horiz problem. But I reversed the diode and tried it that way and it was the same don't know what the difference is but maybe I would see it once I get video. Reason I reveresed the diode because I read a thread on another site that indicated that these diodes sometimes won't work unless they are reveresed from the original ones position. So I put the diode back the same way the old one came out then finish up with the other areas in question then see the result.
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#34
12-24-2015, 02:06 PM
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Ok well I'm stumped , put the diode, 1n34, in and changed the caps I had to and I have plenty of sound but not a picture to speak of, not even a hint of one. If the sound comes off of the video output tube then I would think I'm missing something in the video put section. Any good hints I could follow?
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#35
12-24-2015, 02:12 PM
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Do you have a raster ? Check the contrast control.
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#37
12-24-2015, 03:35 PM
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I checked the IF tube resistances and all were near perfect except for v3 and v4 both 2-7 both tubes should be 82 ohms on the same 2 pins but I'm getting 208 ohms on v4 and v3 144 ohms. I checked the resistances on v 1 to v 6 the video output tube. If the audio comes off the video out tube so strong and clear then the video should be there somewhere.
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#38
12-24-2015, 03:46 PM
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Video is coupled to the CRT cathode through a .05 mfd cap. That cap could be bad or there's a bad connection to the CRT cathode (pin 2).
Also, the brightness control sets the voltage on the cathode. Is the brightness control working ?
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#39
12-24-2015, 04:32 PM
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Well I was hoping that was it but took one leg off that cap and it's not a .05 but rather .047 that should be ok and it tested perfect. Also checked the cathode wire from the 470 resistor up to the crt and that's good to. The brightness control works ok.
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#41
12-24-2015, 05:03 PM
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If it's not too difficult, try reversing the 1N34 end for end. I know some of the older diodes were marked opposite from a modern one.
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#42
12-31-2015, 07:56 PM
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Ok it was very difficult to even get a picture at all but lucky I did because the coil at the ant input was burned and no matter what I adjusted, the IF coils I could not get it clear picture. So I changed that coil and all the adjusting paid off in the long run because here is the result after changing the coil. Sorry it loaded this way.
Last edited by timmy; 01-19-2016 at 10:22 AM.
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Linear Mode
