#1
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Sencore LO-BOY Repair
My Sencore TV pattern generator won't show any picture. I can tell it tries but it's disguised behind massive hum bars.
Knowing this would be a cap issue, I have no idea where to start though: |
#2
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My first guess would be the big two section filter in the upper-right. Next, I'd replace the three axial electrolytics on the PCB.
Try to stay clear of those clear plastic metal foil caps in the middle of the board. Those are polystyrene caps which are very likely just fine and damage easily from excessive soldering iron heat. |
#3
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How would I replace the big two section cap? I assume I can just rig together two electrolytic with their negative sides soldered together.
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#4
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Yes, exactly.
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#5
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Perfect, I should be able to do this then.
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Audiokarma |
#6
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Interesting. I didn't know they made an AC powered version of those... I have one that is almost exactly the same, except that in place of the transformer and big filter cap and such, it has a couple battery tubes to hold 8 C cells.
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#7
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Quote:
Just a though. |
#8
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Quote:
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#9
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I have the same Lo-Boy that Nick the 'Nole has. I repaired mine by replacing ONLY the electrolytic's on the board, but I'd bet that you also need to change the filter capacitors near the power transformer. I wired mine to work on a 12volt wall-wart power supply, and now it's quite stable!
__________________
[B]"Bee care-eh-full to don't broke thee pic-sher tee-yube!" :-) |
#10
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I replaced all the regular looking electrolytic on the mainboard, and half the wax cap (I only have one cap that will work, so I replaced the half that my caps voltage rating is compatible with.)
We got picture! |
Audiokarma |
#11
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Looks good - glad you got it running
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