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macclassic

SE/30 rebooting problem with screenshot

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My SE/30 has now started rebooting by itself in a vicious loop, and "extensions off" makes no difference.

 

On a couple of switch on's it also displayed the shown pattern for a couple of seconds, which then disappears before it tries to boot?

 

 

Screen Shot 2020-01-03 at 14.23.06.png

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Check the voltage of the AB. May me low voltages. Must be 12 and 5 V. Voltages can be checked at the floppy port.

Is the logic board recapped?

Check the reset button. Can be the cause, if it is

Reseat Rom and Ram.

Edited by dochilli

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Yes it's been recapped.

 

But I've just checked the voltages at the port and the 12V is reading 12.72v and the 5v is fluctuating between 4.59 and 4.62v :-(

 

 

 

 

 

 

Edited by macclassic

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That’s right on the edge of when one of the Sony soundchips resets the system.

 

The Sony PSU is easy to recap, that’s what I would start with. I think there’s even a list of the needed caps around here somewhere...

Edited by Bolle

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Thanks for the help and assistance in this matter.

 

I've just swapped in a spare power supply producing 4.9v and the problem has gone.

 

The recap will have to wait :-)

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