Re: Taking apart Lisa - cleaning

From: Philip Lord <philip_at_email.domain.hidden>
Date: Thu, 3 Nov 2005 21:59:06 +0900


If anyone is replacing the capacitors in the PSU, would they be able to document the process with photos and a descriptions. I would be more than willing to host the instructions on my .Mac account.

P

On Nov 3, 2005, at 8:34 PM, Philip Lord wrote:

> As far as I can tell, they are the same as the keyboard pads.
>
> P
>
>
> On Nov 3, 2005, at 4:28 PM, Chris Riedl wrote:
>
>
>> I certainly understand about the necessity to replace all old
>> capacitors. I have restored equipment much older than the Lisa in
>> the past. This was something I was planning on doing very soon,
>> not to mention keeping the Lisa from being used in the meantime.
>> I was just making the statement that I believed that the previous
>> problem had been fixed in the past, and that the power supply
>> isn't missing any parts.
>>
>> On this note, does anyone think capacitors could be the problem
>> with my Widget? I suppose this could be the case, although I am
>> guessing it is something more complicated. Does anyone have a
>> compiled list of capacitors needed to do a full recap of Lisa, or
>> is that something that hasn't been documented? I may as well make
>> a list for those interested in doing so in the future, if there
>> isn't one yet.
>>
>> Also, can anyone direct me to a source for the missing feet
>> pads that Philip told me about in his reply? I really don't like
>> the Lisa rocking back and forth, and if they are similar to the
>> pads used on the keyboard, I would presume there would be a source
>> for them somewhere, as they were probably bought "off the shelf"
>> rather than custom made for the Lisa project.
>>
>> -Chris
>> ----- Original Message ----- From: "Jason Perkins"
>> <quanda_computing_at_email.domain.hidden>
>> To: "LisaList" <lisalist_at_email.domain.hidden>
>> Sent: Wednesday, November 02, 2005 9:30 AM
>> Subject: Re: Taking apart Lisa - cleaning
>>
>>
>>
>>
>>> You can do the caps now while everything is still working, or
>>> later after wong voltages have been going to the device for a
>>> while. Which would you prefer?
>>>
>>> -J
>>> ----- Original Message ----- From: "Chris Riedl"
>>> <zap_at_email.domain.hidden>
>>> To: "LisaList" <lisalist_at_email.domain.hidden>
>>> Sent: Wednesday, November 02, 2005 4:31 AM
>>> Subject: Re: Taking apart Lisa - cleaning
>>>
>>>
>>>
>>>
>>>> Actually, the Lisa appears to be just fine, other than the
>>>> ghost Widget. I am guessing that something failed in the past
>>>> and the power supply was repaired or replaced. I wouldn't
>>>> expect that someone doing that job would go through the trouble
>>>> of taking the entire machine apart to clean up the mess.
>>>>
>>>> -Chris
>>>> ----- Original Message ----- From: "Dr. Helmut Post"
>>>> <helmut_post_at_email.domain.hidden>
>>>> To: "LisaList" <lisalist_at_email.domain.hidden>
>>>> Sent: Wednesday, November 02, 2005 4:19 AM
>>>> Subject: Re: Taking apart Lisa - cleaning
>>>>
>>>>
>>>>
>>>>
>>>>> Hi,
>>>>> I have replaced all old electrolytic caps and the power surge
>>>>> caps in my
>>>>> Lisa- no more problems- and the Voltages are more stable than
>>>>> ever before.
>>>>> I have even exchanged all electrolytic caps in the video
>>>>> circuit- the
>>>>> picture is now much better- the slight jitter is gone.
>>>>> I'd recommend everyone to exchange all electrolytic caps inside
>>>>> the PSU and
>>>>> the Video circuit- it makes a big difference and protects the
>>>>> Lisa for the
>>>>> future.
>>>>>
>>>>>
>>>>> ----- Original Message ----- From: "Chris Riedl"
>>>>> <zap_at_email.domain.hidden>
>>>>> To: "LisaList" <lisalist_at_email.domain.hidden>
>>>>> Sent: Wednesday, November 02, 2005 9:37 AM
>>>>> Subject: Re: Taking apart Lisa - cleaning
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Well, that was certainly an interesting escapade.
>>>>>> Apparently a power
>>>>>> supply cap blew up sometime in the past, and there was crusted
>>>>>> electrolyte
>>>>>> all over the one side. Some cleaning of the chassis and case
>>>>>> later, I
>>>>>>
>>>>>>
>>>>> have
>>>>>
>>>>>
>>>>>> got the Lisa booting up. However, it just appears as if the
>>>>>> Widget is not
>>>>>> present to the system, as it only shows the floppy for
>>>>>> startup. The
>>>>>>
>>>>>>
>>>>> Widget
>>>>>
>>>>>
>>>>>> spins up and sounds normal, but I guess it isn't being seen by
>>>>>> the
>>>>>>
>>>>>>
>>>>> hardware.
>>>>>
>>>>>
>>>>>> Any suggestions or things to try to pinpoint this further?
>>>>>>
>>>>>>
>>>>>
>>>>> I'd recommend to turn the voice coil actuator manually during
>>>>> the spin-up,
>>>>> self test procedure of the Widget.
>>>>> Sometimes it helps....
>>>>>
>>>>> Helmut
>>>>>
>>>>>
>>>>>
>>>>> --
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>
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Received on 2005-11-04 00:52:35

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