Mac SE repeated chime when turned on

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A couple years ago I bought a mac se FdHd. It worked when I got it but shortly after had a horizontal line on the screen and wouldn't boot. I recapped the power supply and analog board and yesterday I finally got around to putting it back together. It did work last night but this afternoon when I turned it on, it started repeatedly chiming and a clicking sound could be heard from it for a couple seconds. It has had the clicking problem before but the computer still booted. Now it's not very happy at all.
I'm just wondering if anyone knows what's wrong with it.

Thanks

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Re: Mac SE repeated chime when turned on

The clicking sound may be evidence of a short circuit.

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Re: Mac SE repeated chime when turned on

[double post]

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Re: Mac SE repeated chime when turned on

[double post...]

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Re: Mac SE repeated chime when turned on

Analog board, i.e. power supply most likely.

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Re: Mac SE repeated chime when turned on

Shot in the dark here... But you did replace C15 on the Analog board with a NP (non-polarized) cap, correct?

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Re: Mac SE repeated chime when turned on

If the cap was a not a NP it will most likely release all of its secret smoke which is very hard to get back in. Wink
wm

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Re: Mac SE repeated chime when turned on

I believe that is the one cap I forgot about... I'll look for a replacement.

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Re: Mac SE repeated chime when turned on

I have confirmed that to be the one cap in the whole thing I forgot to replace... lucky I guess?

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Re: Mac SE repeated chime when turned on

Actually, I was only concerned that you might have replaced that with a polarized cap. That perhaps would explain why it worked for a brief time and then stopped working when the cap failed. You certainly could try replacing it (or test with two electrolytics back-to-back in series) but it probably is not your problem.

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Re: Mac SE repeated chime when turned on

The 3.9uf caps are rather expensive not knowing if it will do anything or not, could I use 3.3uf or 4.7uf instead? They are much cheaper.