Restoring Vintage Radios and Music Equipment : How to Repair Circuit Boards

[desertbard]

Even if it does not operate in battery mode - that is great. It might have some sort of reverse voltage protection. If it works some keys and not others, it means checking for a defective oscillator. See videos on signal tracing - if that is the case. A schematic would be a great help.

If you cannot figure it out - let me know and I'll see if I cannot guide you a little.

KD5KZL

Joe

[az443]

probably not the right place for this, but wanted to ask two questions:

1. does testing for failures in a shorted circuit follow the same logic?

2. I assume that I have a faulty meter if it holds a tone in continuity mode with the probes touching anything, correct?

-I shorted a circuit on a casio sk-10, and am trying to see if there is anything I can do about it (ie. if the problem lies outside the I.Cs.).Any advice would be most appreciated!!

[desertbard]

Great questions...

1. Kindah, but the method is the same, but the logic is different. A short means there is a connection when it should no be there - as opposed to the open - which is well a break - or gap that should not be.

2) You stated you shorted the circuit. I hope you removed the source of the short. The question, does the circuit do anything. If it is completely dead, that would be the best situation. It means you might have damaged

the power supply, but it it lights up -

[rodthesein]

Thanks for this. Am going to try this out.