Apple lisa repair.

[Patnukem]

Ok I have asked at the lisa list but I will also ask here (68kmla has always been so helpful) so if you are part of the lisa list I am sorry you have to read this twice. I have been working on a lisa 2/5 I have had for a while as a

hobby. I have not touched it in a while and lately I have been in the

mood to repair it. The condition it is in now is a whole lot better

then it was when I found it. When the power button is pressed it

lights up, so does the disk drive light. I also can hear a High pitch

sound from the power supply, (could be the high voltage circuit for

the screen I suppose). No video on screen but does seem to display

short lines on screen in several rows, kind of like

_____ _____ _____ _____ _____

_____ _____ _____ _____ _____

_____ _____ _____ _____ _____

_____ _____ _____ _____ _____

_____ _____ _____ _____ _____

_____ _____ _____ _____ _____

and they are moving upward. I have looked in as many documents as I

could find to pinpoint this and have not done so. today when I was

looking I noticed that there were some capacitors that looked like

they were cut from the I/O. I know some are left off on purpose but

these could have been taken out by the person that owned it before me

(an artsy type that tore apart computers by the look of it so it would

not be surprising) I also have no Hard drive for is or keyboard/

mouse, and I do not know if that will effect it's ability to display.

(I would not be surprised if I knew at one time and forgot I have put

this project off for a while)

 

[TheNeil]

This might sound like a stupid question but have you tried adjusting the screen controls? From memory I had to pretty much strip the machine down to get to them (as well as keeping the 'system open' switches pressed) but the display on my machine was totally shot to pieces but a quick tweak here and there and it now works a treat. Could be worth trying

 

[Patnukem]

I will look into it, I doubt it though since the display I was using was though an external cable so I adjusted the external monitor to get that picture up. What does a lisa do without the keyboard/mouse/HD/disk when you turn it on? I still do not know if my I/O board is complete. for example the R41 resistor appears to have been cut off the board compared to the other factory left off parts. (forgive my spelling errors I am horrible at English and have not slept in a while ) I do know that the cpu board is most likely to work since I have two of them I can switch out and they both do the same thing so unless they both have the same problem its not there.

 

[macdownunder]

What does a lisa do without the keyboard/mouse/HD/disk when you turn it on?

The Lisa does a self test when first started. It will fail if it cannot find a keyboard or mouse.

The internal HDD is essentially a ProFile. It's lights operate the same way. Flashing during initial startup self test and steady on test pass.

I still do not know if my I/O board is complete. for example the R41 resistor appears to have been cut off the board compared to the other factory left off parts.

That was part of the Lisa 1 -> Lisa 2 upgrade and shouldn't cause any problems.

I'm not familiar with the screen you describe, so I can't help you there.

Good luck resurrecting the old girl.

Regards,

Macdownunder

 

[Patnukem]

I thought one of the chips on the cpu board looked beat up so on a whim I took it out and switched it with two from my spare cpu board. the one I took out had two bent pins on it (do not know if this was intentional from the last person) and now it boots and with the help of the lisalist have figured out it past the self on test and it needs a keyboard and mouse but now I have to fix a new problem the crt is not lighting up at all. Thanks to several guys on the forum here (special thanks to wally for his extensive knowledge and help) I fixed a old tv so I am a bit more familiar with the crt now. If I can find my neon tube to test the HV and if that does not work I will test that the wires going to the video board are getting power. I have tried adjusting the internal contrast and all the knobs on the back with no luck, I don't think I saw the picture tube filament light up either.

 

[Patnukem]

my bad the picture tube filament is working, I think it may be the 24v voltage regulator great now I have to find a new one of those.

 

[RandomDamage]

If you think U1 (24V regulator) is bad, I could probably send you a replacement part. I bought a couple when I had to replace that part on my video board and have extras.

 

[Patnukem]

cool thanks we will see today (I hope) to open it up and do some tests. Less then 24 hours after running it I discharged the crt and not even the faintest zap, although they do not always do this it just seems to fuel my speculation of the HV not working, but we will see. I will be removing the video board and checking the parts on it. You know the best way to check the regulator and I going to have to test while powered on?

 

[Patnukem]

the only part the "looks" questionable is Q5 it has a lot of strange looking stuff around the top,

It might just be from the installation?

If I have them I might just change out some of the caps and possibly Q5

 

[Patnukem]

well with some help from lisa list and you guess as well as lucky guessing I went with my gut and just replaced Q5 and nothing else and it worked! yeah now I need a keyboard and mouse.

 

[TheNeil]

Good place to maybe look for a keyboard and mouse is http://www.sunrem.com/

I got a keyboard a couple of years back from them and, as I remember it, they didn't actually have it listed but a quick email just to ask anyway came up positive. £80 shipped to the UK wasn't too bad...I suppose

 

[Patnukem]

I thought they had sold off all there stuff I tried going there this morning and there site was unresponsive. just the top of the site with the name and links. it used to also forward to another website http://www.cherokeedata.com/ a while back when I went there.

 

[Patnukem]

ugg the one other place I thought I could get one was a bit overpriced for me (IE over half of the price I have seen lisa's for) I guess I will keep looking. I did find some great High res pictures of the keyboard pcb incase anyone needs to see them http://www.kbdbabel.org/lisa/ I guess they have them to use in there any keyboard to any computer adapter they are making and they may decide to support the apple lisa (that would be strange but it does run off 5vdc just like a usb one).

 

[JRL]

Here's one:

Link("broken" according to seller)

 

[Patnukem]

I actually wrote him earlier before his auction and decided to wait, I do not want to pay $71 for a keyboard with shipping and then have to fix it. specially if tis the intel chip with the rom on it. But if I can not find another one in a while I may resort to one. I have gotten other parts from him that have worked out great so I know he will package them well.

 

[Patnukem]

I just wrote him back to see if I could get one with a working rom, but NF keys. I may be more willing to do that much If I just have to fix the keys, but the rom would be hard to repair. also asked if the reference cards were included.

wow he gets back to me fast, he siad he would get one with NF keys and a working rom and a set of reference cards! so I think I may go for it,

 

[Patnukem]

well I ordered a non working one, I am getting one with just keys that need repaired (foam replaced and clean the contacts) so I do not have to worry about the rom not working. and some reference cards. it should be easy to do with the web pages I have found to help with lisa keyboard repairs.

 

[Patnukem]

I got my keyboard today it looks to be in great condition. Is there a program I can run that will let me check the keys to see what one's I need to fix without having a hard drive yet? I do now have a mouse so I should be able to run anything I need too (Given the mouse/keyboard ports still work).

 

[Patnukem]

well after fixing all that stuff It seems the power supply might have died again. Its making the clicking sound it made a long time ago when I first got it I then replaced some caps and it worked fine, so I am guessing some more of the caps are bad. I did not have them before but I may have some of the replacements now. and the clicking is defiantly coming from the power supply.