19K4606 Half Wave Recifier???? Smoke ~

BSK

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I just figured that this might be interested to share in what I discovered last night while attempting to revive a Wells Gardener 19K4606 relic. It had no picture but it surely had sweeping because when I turned up the black level I obtained a white screen but it had waves running up the long side of the picture. Ah yes a bad filter capacitor in the power supply 330uf turned out to test at 356uf ??? So I looked deeper in to the power supply and notice that the full wave 4 diode rectifier only had 1 diode!!!! Talk about a noisy supply!! Well I figured that was my wave problem so I dove even deeper into the supply and checked for the 127 volt output and found it to be at 147V ???!!! Arggg X-Rays!! So I immediately turned off the unit and set the volt adjust pot to minimum output and restarted only to find out that setting the pot closer to ground turn the voltage even higher 157V oohh.....Ouch. Well then I turned the pot completely the other way and found that it would only get as low as 133v and not the 127v in the literature. At this point I am ok that it is not at the original 147v so I decided to follow the white balance procedure the flyback smoked. :(
Is it common for 19k4606 to have a half wave supply? Or do you think some one cannibalized this unit for its diodes?
Later
Bri-Baby
 
I just figured that this might be interested to share in what I discovered last night while attempting to revive a Wells Gardener 19K4606 relic. It had no picture but it surely had sweeping because when I turned up the black level I obtained a white screen but it had waves running up the long side of the picture. Ah yes a bad filter capacitor in the power supply 330uf turned out to test at 356uf ??? So I looked deeper in to the power supply and notice that the full wave 4 diode rectifier only had 1 diode!!!! Talk about a noisy supply!! Well I figured that was my wave problem so I dove even deeper into the supply and checked for the 127 volt output and found it to be at 147V ???!!! Arggg X-Rays!! So I immediately turned off the unit and set the volt adjust pot to minimum output and restarted only to find out that setting the pot closer to ground turn the voltage even higher 157V oohh.....Ouch. Well then I turned the pot completely the other way and found that it would only get as low as 133v and not the 127v in the literature. At this point I am ok that it is not at the original 147v so I decided to follow the white balance procedure the flyback smoked. :(
Is it common for 19k4606 to have a half wave supply? Or do you think some one cannibalized this unit for its diodes?
Later
Bri-Baby

Welcome to the world of the 4600. I had one in a Pacman I just fixed and thought I had the same problem. Turns out their are a few different revisions. The one in my Pacman only had one rectifier diode wile the one in my 4600 in a Frogger had all 4 rectifier diodes. In my case I kept blowing HOT's and I could find nothing bad but suspected the flyback was bad. Took the one out of my Frogger and the Pacman monitor worked for about 8 hours then died again. Same thing, blown HOT so put another flyback in and it has been working great. I also found another flyback for the Frogger and so far so good. I guess the 4600 monitors are what 30 plus years old now, looks like it's time for the flybacks to give it up.
 

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Very Interesting...

Are there any replacement fly-backs out there for the 19K4606 so I can save my monitor?
Thank you for the feedback! :)
Brian K.
 
Are there any replacement fly-backs out there for the 19K4606 so I can save my monitor?
Thank you for the feedback! :)
Brian K.

No not at this time. It was rumored that Chad at ArcadeCup was going to repo them so their might be hope but for now you will have to find a used one from someone parting one out.
 
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