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#1
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Restoring antique tv
well, this is yet, another follow up.
ive been trying to restore an emerson model 663B. ok, i found out the weakness of the picture was teh ion trap being on wrong. (duhh!! me) the picture is now bright sharp and crisp. everything works now, except for 2 problems. the horizontal is VERY touchy, and teh sound is weak, but i think i know whats wrong with the sound. here is what i want to try to solve. i got the set to work fine, but the horizontal wouldnt lock when turning the hold control. i went to the back and adjusted teh horiz. freq. adjustment and it showed up as multiple images on teh screen, and i adjusted the hold control to get teh picture to lock into place. but here comes the problem: the control is very touchy, you have to have it dead on to lock. and the main problem is, lets say its on a scene from a program, and the picture is locked in place. well, if the scene changes, like if it gets darker or brighter, or if the scene moves, BAM. the horizontal is out again. i readjust and get it to lock, and when the scene changes back, its gone again..... but if i leave teh lock alone, it will lose horizontal, and when it comes to a scene similar to the one i adjusted it on, it slows down to a stop and locks again, until the brightness, or the scene changes in any way, and the horizontal jumps all over the place. I dont have any trouble with the vertical, its as stable as can be, altho, there are retrace and forground dashed lines that change at different scenes that drive me nuts, but ive heard thats from too strong of signal. Any ideas? |
#2
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Dan wrote:
I dont have any trouble with the vertical, its as stable as can be, altho, there are retrace and forground dashed lines that change at different scenes that drive me nuts, but ive heard thats from too strong of signal. Any ideas? Take a look at the sync separator circuit's horizontal signal output. May be very weak. Bad resistors? Higher value resistors tend to drift high. Had a 470K in a pre war Emerson radio that measured 870K. |
#3
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I used to fix TVs when this set wasnt so old. My boss had one he was fixing
up with the same problem. One day he broke down and did an I.F alignment on the set and voila, rock steady sink. "Robert Casey" wrote in message ... Dan wrote: I dont have any trouble with the vertical, its as stable as can be, altho, there are retrace and forground dashed lines that change at different scenes that drive me nuts, but ive heard thats from too strong of signal. Any ideas? Take a look at the sync separator circuit's horizontal signal output. May be very weak. Bad resistors? Higher value resistors tend to drift high. Had a 470K in a pre war Emerson radio that measured 870K. |
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