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#1 2014-12-20 20:28:12

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Fixes in Macintosh II series.

Hi all.
I undertook to do fixes in a friends Mac II series computres (Number of pieces, and types: II*2 , IIcx*2, IIci*1, IIsi*4 IIfx*4, IIvx*1, IIvi*2).
I'm looking for some informations, but i'm quite confused, so I'd like to ask for help.
He's got evry single Mac II?? without the IIx. Anyway. I'm asking for the most popular problems.
That I found, that could happen (or not...I haven't seen any of those computers):

-It won't even turn on without battery (II,IIx,IIfx)
-Shoud recap
Batteries probably leaked (I'm also asking you for Battery voltages. I saw 3V 1/2AA battery in a Mac II, and I saw a few modells (not sure what) with 3.6V) This difference could kill the MacII board, if I put a 3.6V battery in it? Or will work fine?
-I also saw quite few Quantum ProDrives with stuck heads. Probably have to replace the HDDs.
-Luckily, the IIci is working perfectly, but there's no OS. I'll solve it big_smile
-There are probably Many-many untested computers.
-Maybe, I'll use a few of them as a component mine...


What do you think about it? Will they work, and I'd like to ask for tipps, and common problems.

Thanks, Waiting for reply.

Last edited by Ganz-hun (2014-12-20 20:31:20)

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#2 2014-12-20 20:46:24

max1zzz
Member
Registered: 2014-05-18
Posts: 207
Website

Re: Fixes in Macintosh II series.

Your research seems to be good,
The big box II's (aka the II, IIx, IIfx) will not turn on without good batteries (there are two in each). All the others will boot fine without one

Recap the all, working or not. It's a common misconception that if they are working the capacitors are good, they are almost certainly leaking weather the machine is working or not.

Also it's worth noting the paper filter caps in powersupplys often fail in these, So if one of the machines powersupplys starts making a alarming crackling noise and smoke comes pouring out of it the filter caps have probably gone. Just open the powersupply and see if one of the paper caps has blown out, if it has just replace the cps and you should be good to go

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#3 2014-12-20 22:31:30

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Re: Fixes in Macintosh II series.

thanks smile

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#4 2014-12-20 22:53:05

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 965
Website

Re: Fixes in Macintosh II series.

You can jump start those big box IIs before you replace the battery. This trick may also be used to determine if you have a bad PSU or simply a dead battery. This YouTube video explains it better than I could:


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#5 2014-12-21 06:32:06

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Re: Fixes in Macintosh II series.

Usefull smile thank you. I'll test them out, as soon as i get to budapest big_smile

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#6 2014-12-22 17:41:21

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Re: Fixes in Macintosh II series.

Hi agian. Could somebody tell me about correct battery voltages?
Am I able to start up a big box with a Cr2032 w/socket and wires?

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#7 2014-12-22 17:42:55

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 965
Website

Re: Fixes in Macintosh II series.

I can't say for sure but I'm pretty sure 3.2V should be sufficient.


Daily Drivers: 27" iMac 2.8 GHz Quad-Core i7 (Late 2009), 21.5" iMac 2.7GHz Quad-Core i5 (Late 2013), 11" Macbook Air 1.6 GHz i5 (Mid-2011)
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#8 2014-12-22 17:55:52

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Re: Fixes in Macintosh II series.

I asked it because I saw 3 volt battery in the Macintosh II, and perhaps 3.6 in a Macintosh IIfx or simlar apple product. i don't remember. But thats 100%, my PM7500 came with 3.6V battery.

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#9 2014-12-22 23:37:31

ClassicHasClass
Member
From: Electron Alley
Registered: 2014-05-26
Posts: 1,099
Website

Re: Fixes in Macintosh II series.

I think it's the same as any other 1/2AA (3.6v).

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#10 2014-12-23 07:28:52

mcdermd
Member
From: Corvallis, OR
Registered: 2014-05-12
Posts: 965
Website

Re: Fixes in Macintosh II series.

The black, soldered-in Vartas on early Mac IIs, Mac SEs and Apple II GSes are 3.0V Lithium batteries.


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#11 2014-12-23 12:49:13

uniserver
Member
From: Sf, Mi
Registered: 2014-05-15
Posts: 956
Website

Re: Fixes in Macintosh II series.

The black, soldered-in Vartas on early Mac IIs, Mac SEs and Apple II GSes are 3.0V Lithium batteries.

they say 3.0 volts on the side.
but they are 3.6 volts if you find one that still has a pretty good charge, and check it with a meter.

And Yep!  They are the same as any standard 3.6v 1/2 AA
Mouser has the holders if you need them.  They Install pretty good.

Some people argue that Varta is the best pram battery.
Because of the NiCd Varta batteries that leak and cause soooo much damage with the Amiga etc.
But keep in mind that battery, was a rechargeable. Not a lithium like what Apple used in the mac.
Who knows what Amigas Charging circuit does...  probably tries to still charge it, even though its gone bad
causing the battery to overheat and leak.

If you look up the part number on the soldered in Varta Batteries you can still buy that part number surprisingly.
and what is funny is they still say they are 3.0 volt batteries when they are actually 3.6v.

Those soldered in Varta made in Germany batteries, IN those machines that have them... (most of the time) have lasted all these years
and still hold a charge in most cases!!!   

So it would not be unreasonable to consider replacing it with the same brand of battery.
That is assuming, Varta still makes them to the same specifications with the same quality of materials.
-- they are still made in Germany.
http://www.battery2batteries.com/varta- … AhFx8P8HAQ
CR1_2AA_2__97644.1407628441.1280.1280.jpg

Last edited by uniserver (2014-12-28 15:18:46)


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#12 2014-12-23 16:36:12

ClassicHasClass
Member
From: Electron Alley
Registered: 2014-05-26
Posts: 1,099
Website

Re: Fixes in Macintosh II series.

Yeah, I got the NiCad out of my A3000 the first day I bought it (used).

My A4000T uses a regular lithium battery.

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#13 2014-12-24 20:58:00

techknight
Member
Registered: 2014-05-22
Posts: 449

Re: Fixes in Macintosh II series.

Those Varta batteries are workhorses, I had one in my SE which was STILL keeping time before I cut it out and tossed it. not taking any chances.

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#14 2014-12-28 09:47:38

Ganz-hun
Member
Registered: 2014-12-20
Posts: 7

Re: Fixes in Macintosh II series.

Thank you for evrybody smile

Last edited by Ganz-hun (2014-12-28 20:57:47)

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