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#587
10-10-2022, 03:24 PM
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#590
10-10-2022, 04:10 PM
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thus I was a bit confused when you said "Pin 1 of horizontal oscillator has a .5 cap" to me that meant C78, :O It would be helpful if you gave part numbers from the SAMS to make it more clear :P that part of the circuit is for sinewave shaping, the larger value volt cap should not matter, BUT value and type WILL.
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#593
10-10-2022, 08:45 PM
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well, until you find someone with an oscilloscope, or are able to get one, you are quite limited.
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#594
10-11-2022, 07:19 AM
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Username1 mentions that the horizontal oscillator of course is not running correctly and that it don’t seem to have the punch behind the oscillations which makes sense so if there are no resistors bad and voltages are present then the only thing left is caps oscillator coil which checks out fine and flyback the hots were changed as well. Right now I don’t have a scope so I’ll need to push on without it for the moment. And of course if the flyback is good caps make the proper speed and shape of the signal.
Last edited by timmy; 10-11-2022 at 07:32 AM.
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#596
10-11-2022, 10:51 AM
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Well I’m not one to give up but it’s altogether and still low hv pulling the 145 190 275 voltages down is it possible there is a problem in the panel that has the g1 control and the red green blue controls. I’m not finding any reason for this voltage to drop and I believe this is affecting the horizontal drive low voltage low or no horizontal drive. It needs 190v and 275v and they drop to far to support the oscillator.
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#597
10-11-2022, 12:24 PM
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What is a good low esr power supply cap 450v 100uf I have 2 sprague caps in the series circuit and that voltage stays up 385-390v but the other caps that supply 145 190 275 have got to be bad even though my cap checker shows good but in circuit they may be breaking down.
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#598
10-11-2022, 01:04 PM
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If you have replaced them already, you have virtually nothing to gain by replacing them again at this point, the problem is someplace else.
C3A, C2B, C3B, C2C, https://www.mouser.com/ProductDetail...nVkrybSw%3D%3D https://www.mouser.com/ProductDetail...j1prphYw%3D%3D https://www.mouser.com/ProductDetail...K8MOO7xA%3D%3D prob replacements. “low esr” caps are really not the right kind for this area, and hard to find in the values needed, General Purpose Electrolytic Capacitors will do just fine here.
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#599
10-11-2022, 01:21 PM
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#600
10-11-2022, 01:43 PM
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https://www.avnet.com/wps/portal/aba...ic-capacitors/ Where it comes into play is higher frequency buck converter type power supplies, but in vintage stuff like this, it would really not help much at all at 60hz line inputs.
__________________
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