Re: I blew it - literally

Hi!

I would agree and think like the previous lister. Try this: Take a pencil or something else non metallic (you also can use a screwdriver, a Q-Tips, piece of wood) and push the safety switch. You can hear a "click". Then fire-up the Lisa. If it works, the switsch is only a little "bended". Sorry I don't know the expression for "curved, not linear". Or you didn't completely insert the back cover of your Lisa.

First try this, before you will go on

greetings: TOM from Bavaria, the country of the original Octoberfest in Munich

Am 01.10.2014 um 23:27 schrieb lincoln.roop_at_email.domain.hidden:

> Totally random thought, but to me it seems odd that just opening
> the door while the machine is on would cause permanent damage.
> It's possible you shocked the machine with static electricity and
> damaged something, but one thought that occurred to me: Try
> checking the safety switch itself to make sure that it is OK - IIRC
> the rear safety switch is built into the power supply and soldered
> to the board, make sure that when you press the switch you can see
> the circuit make using an ohmmeter, and also make sure that when
> you put the rear door back on and tighten the thumb screws that you
> actually hear the safety switch click on.
>
> On Saturday, September 20, 2014 1:38:04 PM UTC-4, pintoguy wrote:
> So, I had a perfectly good Lisa 2/10 which I had fixed earlier (I
> had a short in the widget fan). Then, as I was demo-ing it to a
> friend, I made the mistake and opened the back cover while it was
> turned on. As expected, the safety switch tripped. The problem is
> that, since then, the Lisa won't power up. I checked that the 5V
> standby is there, and I also checked that I get the 18V and 170V DC
> in the power supply. When the PS is connected in the unloaded
> state, I noticed that resistors R2 and R33 and hot, but this might
> be normal,, as the schematics tell us that they will be
> dissipating about 0.5 W at idle (170V in 51kohms dissipates
> 170x170/51,000=0.5W). However, resistors R4, R5, R7 and R8 are also
> very hot to the touch. They are, from what the schematics say, part
> of the push-pull switching regulator.
>
> Would anyone be able to help me ?

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