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Apple Lisa doesn't boot - need help troubleshooting


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#1 Juror22

Juror22
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  • LocationCentral Illinois

Posted 08 July 2017 - 04:36 AM

I have some Lisa parts that I acquired over time and would like to get running.  My issues don't seem to follow any of the other threads or guides that are out there, so after thrashing about quite some time, I am hoping someone has enough experience to help definitively identify what the issues are so that I can get it to at least boot.  From there I think that I could sort things out.

 

Here are the parts that I have:

2 Lisa 2's (1 is missing the faceplate, neither has a hard drive, 1 has the floppy drive and cage)

2-1/2 power supplies (1 recapped, 1 purchased as 'working', 1 that is missing the transformer)

1 profile drive and cable

1 keyboard and (mac mouse)

2 card cages

the following boards

2 motherboards

620-0108-c recapped, traces checked, no other parts replaced

620-0108-e recapped, traces checked, no other parts replaced, 1 IO board connection was broken, so I ran a trace wire in its place

3 IO boards

620-0117-m (2/5) This one had a battery backup that I removed, was recapped, cleaned and checked for continuity (fixed a single trace that I found broken), replaced three transistors that were iffy.

620-0117-j (2/5) This one had a battery backup had been removed, was recapped, and had connectors that were replaced, but it is in rough shape, unsure continuity, generally not included in testing

620-0142-e (2/10) This one did not have a battery backup and is in excellent physical appearance - no replacement of parts, continuity that has been tested is fine

1 CPU board

2 Memory cards (512MB)

 

Here is what I have done:

power supply recapped one (filter caps were fine and were not replaced), other was supposed to be working

motherboard (see above)

IO board (see above)

 

I have read that the minimum assembly to boot is the card cage, motherboard and IO board, so I installed those, put in the power supply, defeated the 2 case switches (no mouse or keyboard attached) plug it in and the power button instantly lights up.

 

Allowing a case switch to close turns off the power light and there is an audible click.  This happens with either Lisa, either PS, either MB and either IO board.

 

Suggestions on how to check out a power supply, without it being installed in the Lisa

 

Suggestions for where to check or what to try next?


Edited by Juror22, 08 July 2017 - 04:39 AM.

The macs are winning...


#2 bibilit

bibilit
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Posted 08 July 2017 - 02:45 PM

in my opinion you need the processor card as well, no sure it could work without.

 

I have one at home at the moment, should try to boot it also.


Macintosh Classic and II ,CC, SE, SE/30,IIsi 25mhz(RasterOps video),Q 700,LC, LC III,LC475, PBook Wallstreet/Bronze/5300cs/1400c/100/Tibook Imac G3 slot-in, Bondi and G4 / PMac G4 sawtooth, QS, MDD, Yikes!, Cube, Imac Core 2 Duo, Ibook G3 (white/clam) G4 + Newton 120, eMate 300,Quicktake 150,  PowerCD


#3 CelGen

CelGen
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  • LocationKamloops, Canada

Posted 08 July 2017 - 09:12 PM

in my opinion you need the processor card as well, no sure it could work without.

 

I have one at home at the moment, should try to boot it also.

I believe the "motherboard" is what he was calling the CPU board.

 

The power circuit is controlled by the COP421. Verify it and the socket is in good condition as it lives very close to where the battery lives.

 

Apple_Lisa_rough_341cal_1000w.jpg

 

The power-on should consist of two audible pops from the speaker (and either an image on the screen, or just a raster at around the same time), two more clicks in succession followed by any error codes detected by the system being beeped out. You can force it to beep an error code by simply not plugging a keyboard in.

 

For testing the power supply remove the side skin panel closest to the power supply and CRT and you should see the harness connection for the power supply. The pinout for the Widget and non-widget power supplies are the same, so using that as a pin reference you should be able to verify +5, +12 and +5StandBy. Those are your basic rails and all three are needed.

 

Also, you have Lisa2 cases but are they Lisa 2/5 or 2/10? There are differences that personally I've never been able to test but I assume are incompatible.


Edited by CelGen, 08 July 2017 - 09:21 PM.


#4 stepleton

stepleton
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Posted 08 July 2017 - 11:52 PM

Re power supply testing:

I tested my recently recapped Lisa PSUs on the bench by hooking up dummy loads (power resistors) to the +5, +12, and +33 volt rails. With these set up, you can check the voltages on all the rails to see if everything is in spec.

Start by looking at the specs for the power supply in a copy of the Lisa Hardware Manual, like this one:

http://lisa.sunder.n...eManual1983.pdf

where PDF page 259 has the specs you need. Apply Ohm's Law to figure out resistor values to use to keep the current draw within the bounds specified for the three positive rails, and make sure that you use resistors that are capable of dissipating the dozen or two watts that you're going to pump through them.

You can't run a 1.2A PSU without loads on these rails---the voltages will go far enough out of spec for the PSU's crowbar circuit to repeatedly "reboot" the power supply (making a clicking noise you can hear). We found that the -12v rail does not need a load in spite of the 0.01A minimum current spec, at least for a brief test.

The PSU is nominally off when it's plugged in with nothing (or only the dummy loads) attached. In this state, though, the separate 5v standby supply is still active. You can test this voltage without a load, which is the thing to do first.

Once you're ready to turn the PSU on, in addition to setting the dummy loads in place, you will need to connect the 5v rail to the 5v sense line (so that the PSU can monitor itself) and the 5v standby supply to the on/off line (so that the PSU turns itself on). Both of these connections must be maintained for as long as you want to keep the PSU running. It seems fine to arrange all the hookups with the unit unplugged and then to plug the thing in so that it turns itself on immediately.

Some cryptic pinout information can be worked out from the schematic:

http://bitsavers.inf...ower_Supply.pdf

With the contacts on one side of the board labelled with numbers, and letters used for contacts on the other side (ambiguous letters like I and O are not used), you can work out what needs to be clipped where. It's a lucky break that there are no "hard" connections to clip for setting up the resistors and other connections---you can always clip right onto the edge connector, since it doesn't matter if the contacts on both sides at the places you'll need to clip are shorted. (In fact, this makes it easy to clip the +5v sense line to +5v.) This is not generally the case, but it is for the contacts you want to use.

Once the PSU is set up and plugged in, test all of the power rails for the right voltages. I try to be quick about it, since it's not clear to me whether leaving the -12v rail unloaded would be OK for an extended period.

Hope this helps!

Edited by stepleton, 08 July 2017 - 11:58 PM.


#5 Juror22

Juror22
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  • LocationCentral Illinois

Posted 09 July 2017 - 04:12 AM

Thanks for the suggestions, tips and information.  I will perform the additional checking and report back.

 

The Lisa 2 cases are A6S0300's with mfg dates in '83, so between that and the interior cables, I think that they are compatible with the boards.  The only exception that I have found in researching this was that a 2/10 IO board requires modification to the Lisa Lite board to make the floppy functional http://lisafaq.sunde...l#lisafaq-hw-io

 

My PSU's (all) are the 1.8A units

 

I also recalled that there are a few additional procedures that I forgot to list above...

on the IO board 620-0117-m, I removed the battery switch, disassembled and cleaned it, then re-soldered it on.

on the motherboard 620-0108-c, I removed the mouse connector, renewed the connector pins and re-soldered it.

on the PSU that I recapped, I replaced the power transistors (2N6308).


Edited by Juror22, 09 July 2017 - 04:49 AM.

The macs are winning...


#6 stepleton

stepleton
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Posted 09 July 2017 - 10:58 AM

You can bench-test a 1.8A PSU using the same procedure I described. I don't know what happens if you try this kind of PSU without a load, though.



#7 bibilit

bibilit
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Posted 09 July 2017 - 12:18 PM

 

I believe the "motherboard" is what he was calling the CPU board.

 

Ok, the Lisa is probably the only Apple having a Motherboard (it's written on the board) and is the bottom board where all the other ones are connected to.


Macintosh Classic and II ,CC, SE, SE/30,IIsi 25mhz(RasterOps video),Q 700,LC, LC III,LC475, PBook Wallstreet/Bronze/5300cs/1400c/100/Tibook Imac G3 slot-in, Bondi and G4 / PMac G4 sawtooth, QS, MDD, Yikes!, Cube, Imac Core 2 Duo, Ibook G3 (white/clam) G4 + Newton 120, eMate 300,Quicktake 150,  PowerCD


#8 stepleton

stepleton
  • 6502

Posted 09 July 2017 - 02:09 PM

One obvious final thing I still always forget: make sure to defeat the interlock switch on the back of the PSU (near the video adjustment pots) while you're doing these tests. The +5v standby will work whether the interlock is defeated or not; the other rails won't.

 

Just wedging a piece of cardboard between the switch and the housing will do the job.



#9 Juror22

Juror22
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  • LocationCentral Illinois

Posted 10 July 2017 - 05:53 AM

bibilit - I was looking for help and it is appreciated, I only learned about the differentiation a few months back, when I started paying a lot more attention to checking that board.

 

stepleton - That's true, it is the case switch that tags along and I've overlooked it before.  I use Q-tips® to defeat the interlocks, but cardboard is a good idea too.  I am trying to sort out the resisters required for the loads.  I really miss RadioShack, they were great for stuff like that, everything (where I live) is mail order now. :sad:


Edited by Juror22, 10 July 2017 - 05:54 AM.

The macs are winning...





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