Re: Another help question. power supply

O my bad did you mean The huge mj8505 transistor? I was told that I could replace with MJ16018, It would be easier if you could tell me what to check based on the number from the schematic I have. from http://www.freeinfosociety.com/electronics/schemview.php?id=1419 Because I am so lost on this, I must be stupid today so sorry everyone.

Patrick

On Mar 21, 2007, at 9:56 AM, tommoni wrote:

> Hi Patrick,
>
> very very very likely that one of the secondary diodes has a
> shortcut. So before you solder out all the caps, first try to make
> some measurements instead of a try-and-error-repair :-)
> There's only one big dual-diode (looks like a transistor in the
> metal-housing) which is probably the bad one if you describe that
> clicking-sound. It's overcurrent shut-down, because that diode has
> a shortcut. Try to measure with an ohm-meter one of both contacs at
> the soldering side with the housing of that diode. There must be
> one good and one with less than 0,5 ohm. Else try all the diodes
> vertically mounted, they could be bad too
>
> greetings TOM from Bavaria, the center of europe, the marvellous
> castles of Koenig Ludwig e.g. Neuschwanstein and last but not least
> the original Oktoberfest !
>>
>
> Am 21.03.2007 um 11:13 schrieb Patrick Garber:
>
>> Could the "solid state relay" be bad? Because I hear
>> clicking when I hold the power button in. I read this http://
>> lisafaq.sunder.net/lisafaq-hw-pwr_Lisa_does_not_power_on.html
>>
>> Thank you
>> Patrick
>
>
> >

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