Anyone has schematics for 270c and 520?

[TheBlackRabbit]

Hello!
So, I recently got into my possession 520 and 270c, however to my surprise the guy decided to give me 270c with small dock, floppy drive and a couple more additional cables along with that 520, I am not the guy to say no to that

So, 520 had really, really crusty battery on one side, I managed to clean up quite a bit, the thing works good, but unfortunately it is not having correct output voltage for battery...and it won't start on battery inserted (I have re-celled the battery, 10.96V out seems fine)...

Now, 270c, he had no PSU for it, he said has one but not on him, left it at work to test, he thought it was dead...I was like "okay, oh well" and figured that G3 PowerBook supply should be good enough for it...but...nope...thing won't even think to turn on...

I recapped one cap on 520 that did some nasty stuff around the battery charging circuitry, that diiid kiiinda change things but not enough to get anywhere with the battery...

Recapped (kinda botchy, but ok) the 270c but that one refuses to even let a sound out...nothing...checked some voltages around and some MOSFETS are not turning on...now...that could be PB G3 PSU (it does work fine with PB G3) but it could be sth dead on the board too...

Sorry for the long intro....but...question is, has anyone ever gotten any schematics for any of these? Would reaallyy help me figure out what the hek is wrong either of them...
Or if maybe someone had similar issues with a potential solution there ?
I noticed that 520 also has 2 beefy looking 68uF caps right next to the leaked one, they don't exhibit anything of the leak kind so I didn't replace...there is a lot of SMD chip caps, anyone had issue with those?

I would really like to revivie the 270c, I like the form factor and the feel of it...neat little machine

Thank you all!

 

[3lectr1cPPC]

No schematics unless @Arbee intervenes.

Re 520:
Have you run the relevant battery reset software on that rebuilt battery? (EMMpathy, LIND BU 500, Apple's utility). See this thread: https://68kmla.org/bb/index.php?thr...ery-rebuild-failure-oops-all-dead-emms.46341/

Re Duo:
The G3 adapter should work, which means the issue is with the Duo. Check your recap job for errors. If that checks out fine, it's likely failed components in the DC/DC. Were the original caps leaking? If so, the cap juice can short and kill the boards in those if power is applied. Not saying that's what happened, but it's a possibility.

 

[3lectr1cPPC]

I noticed that 520 also has 2 beefy looking 68uF caps right next to the leaked one, they don't exhibit anything of the leak kind so I didn't replace...there is a lot of SMD chip caps, anyone had issue with those?

Oh and - as long as these are the purple colored caps then they're fine. Solid state polymer.

 

[croissantking]

So, 520 had really, really crusty battery on one side, I managed to clean up quite a bit, the thing works good, but unfortunately it is not having correct output voltage for battery...and it won't start on battery inserted (I have re-celled the battery, 10.96V out seems fine)...

Note that you will need to rebuild the PRAM battery in order for the main battery to work properly.

Have you checked if you’re getting good voltage output on the VBATT line on the charger?

 

[3lectr1cPPC]

Note that you will need to rebuild the PRAM battery in order for the main battery to work properly.

It's to my understanding that the battery will work fine except for not being able to boot the computer without a kickstart from wall power. That's how mine acts anyway.

 

[croissantking]

It's to my understanding that the battery will work fine except for not being able to boot the computer without a kickstart from wall power. That's how mine acts anyway.

Yes I think that’s correct (that’s what I meant by not working right)

 

[Arbee]

No schematics unless @Arbee intervenes.

I've got basically nothing for portables, which is why it's been rough getting any of them emulated, and as far as I know there aren't any Bomarc schematics for them either.

 

[3lectr1cPPC]

Yeah there's no bomarc stuff for the PowerBooks. Only laptop schematics we have are the Macintosh Portable, PowerBook 100, PowerBook 140/145/170, and some later G4 stuff. Not much that can be done about the lack of schematics then. If you don't have them, no one does

 

[croissantking]

Yeah there's no bomarc stuff for the PowerBooks. Only laptop schematics we have are the Macintosh Portable, PowerBook 100, PowerBook 140/145/170, and some later G4 stuff. Not much that can be done about the lack of schematics then. If you don't have them, no one does

Someone has the Duo 210 schematics, as you know since you posted on the thread on TinkerDifferent. Hope they get released. Personally, I would very much like to see schematics for the 160/180 and 500 series.

 

[joevt]

To find schematics, you might look up the Apple part number of the logic board in "Service Source" or "Macintosh Computers Service Guide" or "Apple Service Module Identification Manual", then google for a schematic or board view of that part number. I haven't seen any in the 621-xxxx range (for 68K Macs). There are many in the 820-xxxx range which include PowerPC Mac models after late 2001.

 

[imactheknife]

Post some good quality pictures of the boards. Show me a good clear close up if the 270c I just did one last week or so

 

[mdeverhart]

For the 270c - If the PRAM battery is dead (and it almost certainly is, unless it’s been replaced or rebuilt), try using the power button on the rear of the machine instead of the one above the keyboard. The power button above the keyboard is a “soft” power key that goes to the Power Manager IC, which doesn’t stay running if the PRAM battery is dead and the power cord is disconnected. The first time you turn it on after removing and reconnecting the AC adapter you’ll need to use the rear button instead of the keyboard one. Try a couple of times if it doesn’t boot the first time.

 

[TheBlackRabbit]

No schematics unless @Arbee intervenes.

Re 520:
Have you run the relevant battery reset software on that rebuilt battery? (EMMpathy, LIND BU 500, Apple's utility). See this thread: https://68kmla.org/bb/index.php?thr...ery-rebuild-failure-oops-all-dead-emms.46341/

Re Duo:
The G3 adapter should work, which means the issue is with the Duo. Check your recap job for errors. If that checks out fine, it's likely failed components in the DC/DC. Were the original caps leaking? If so, the cap juice can short and kill the boards in those if power is applied. Not saying that's what happened, but it's a possibility.

Ahhm I did not, will have to take a look on that util...


For the duo...recap job...eh...is a little botchy (Used small TH caps) but it's okay...
The old ones were very leaky, smelled fishy the whole day in the office XD

Note that you will need to rebuild the PRAM battery in order for the main battery to work properly.

Have you checked if you’re getting good voltage output on the VBATT line on the charger?

Hm, I didn't take photos when I opened the thing up, however, I might have missed the location of the PRAM batt, I don't think I noticed it at all...

Are they the same VL2330 like in the 270c?

Post some good quality pictures of the boards. Show me a good clear close up if the 270c I just did one last week or so

Hmm, will have to re-open it, but I can take a few good snaps

For the 270c - If the PRAM battery is dead (and it almost certainly is, unless it’s been replaced or rebuilt), try using the power button on the rear of the machine instead of the one above the keyboard. The power button above the keyboard is a “soft” power key that goes to the Power Manager IC, which doesn’t stay running if the PRAM battery is dead and the power cord is disconnected. The first time you turn it on after removing and reconnecting the AC adapter you’ll need to use the rear button instead of the keyboard one. Try a couple of times if it doesn’t boot the first time.

I did try, held it for 20-30 seconds, nothing revived it...
What I did notice that the power button voltage is around 0.9V...which doesn't smell good...
I traced the power when I plug the charger and the voltage keeps holding at 24 until a point, roughly at two points it stops, and a couple of MOSFETS that have Gate voltage about 0.9V and 24V on Drain and nothing coming out, beyond that I see very little sensible voltages, nowhere to see 5V or 12V, I did catch 3.3V and 6 or so at the PRAM battery but that is about it that seems okay...smells to me like the DC-DC has an issue and I am not too great with those sadly...

That being said, I did plug it without anything else attached, just bare PCB...not sure does the screen hold anything that might affect the situation...I suppose it should be fine, but still ya never know...

Edit: And thermally, nothing heats up or warms up...like...nothing...so I am hoping that the thing did not grenaded itself into oblivion....

 

[finkmac]

Someone has the Duo 210 schematics, as you know since you posted on the thread on TinkerDifferent. Hope they get released. Personally, I would very much like to see schematics for the 160/180 and 500 series.

Indeed, it looks like @ThisDoesNotCompute has the PenLite/210 schematics!
As shown off in his video here

Spoiler: for the lazy

I hope he does the community a solid and releases these! Just think of all the dead machines this could help!

 

[GRudolf94]

Indeed, it looks like @ThisDoesNotCompute has the PenLite/210 schematics!
As shown off in his video here

Spoiler: for the lazy

View attachment 79376

I hope he does the community a solid and releases these! Just think of all the dead machines this could help!

Not only schematics but it seems a disk (and ROM?) dump too?

 

[3lectr1cPPC]

I hope he does the community a solid and releases these! Just think of all the dead machines this could help!

My guess is that he got them from someone else and does not have permission to release them.

 

[cj_reha]

My guess is that he got them from someone else and does not have permission to release them.

While plausible - I have certainly received documentation/software under agreements to keep it under wraps for a myriad of reasons - the only reason we know these schematics exist is because he publicly showed portions in his video on his 400k+ subscriber YouTube channel, including an entire page at one point. If I'd shared them under such an agreement I'd be quite upset about the fact ANY portions were shown publicly. I'm really not sure the motivation, because I and many others certainly have/had many crappy Duos that would really benefit from some of this info being more available!

 

[ThisDoesNotCompute]

I'm bound by an agreement to not release them at this time, but should be able to at some point in the future.

 

[cj_reha]

I'm bound by an agreement to not release them at this time, but should be able to at some point in the future.

Respectfully - what are the criteria that need to be met in order for the schems to be released?