Macintosh II Ressurection

[stj]

Re: Macintosh II Ressurection

7.2v instead of 6? you would need a schematic to see what it does with it.
if it just pushes it into a 5v regulator then fine, but you need to be sure.

[Meall]

Re: Macintosh II Ressurection

would there be a risk of using 3.6V batteries to replace the 3V batteries? Those I can get for a decent price. and 1/2 AA bat. holder is dirt cheap.

[dragos2009]

Re: Macintosh II Ressurection

buy 2 energizer lithium and put a battery holder in it the batteries will last like 10 years

[stj]

Re: Macintosh II Ressurection

they are sold as camera batteries - so people take the piss with the price.

[Meall]

Re: Macintosh II Ressurection

2032 wont last as long though.
if you do want to use 2032's you can salvage the sockets from some old motherboards.

Ah, I see. Makes sense.

I have a bunch of 3.6V 1/2 AA batteries, sadly this bad guy it using 3.0V.

Sockets for 1/2 AA are easy to find and cheap on eBay. The batteries is something else... They tend to be expensive...

[stj]

Re: Macintosh II Ressurection

2032 wont last as long though.
if you do want to use 2032's you can salvage the sockets from some old motherboards.

[Meall]

Re: Macintosh II Ressurection

they are ½AA 3v lithiums i think - wire ended.
you can get them, but you can also get then without wires and buy a pair of holders.
probably cheaper that way.

there is no bodge for this, you need those big cells.
what's written on the old ones?

I wonder if it could be possible to use this socket and CR2032 here? they are dirt cheap, and we can get 2032 cheaply on eBay too.

[goontron]

Re: Macintosh II Ressurection

You could run netBSD on it....

[stj]

Re: Macintosh II Ressurection

they are ½AA 3v lithiums i think - wire ended.
you can get them, but you can also get then without wires and buy a pair of holders.
probably cheaper that way.

there is no bodge for this, you need those big cells.
what's written on the old ones?

[Meall]

Re: Macintosh II Ressurection

Sorry to resurrect this thread, but I have a Mac II showing similar symptoms. One of the two soldered batteries is showing 3V and the other nothing. When started up, I hear the "dead" sound. What would be the best solution to replace the batteries on the cheap?

I looked on eBay but not really sure if it worth what I found. Maybe there's better place to find replacements.

[BigTroll]

Re: Macintosh II Ressurection

Oh BTW nice thread, seeing TC work on a vintage mac is heart warming and priceless. does anyone happen to have a good working SE/30 motherboard I have 2 SE/30s and I recaped both boards but SCSI does not work on either board don't know what happened.

[BigTroll]

Re: Macintosh II Ressurection

Yeah, they did last a while. I know the IIfx, IIcx, IIci, Classic II and a few other random models suffer from bad motherboard caps. The LC and LC II suffer from bad power supply caps. Interestingly the SE I picked up tonight works fine sans the Miniscribe hard drive.

Yeah I had to heat my psu up with a space heater or the lcii wouldn't boot I found leaking elnas out the bottom and replaced the elnas With nippon kys been fine ever since I also treated it to a tantalum recap

[Compgeke]

Re: Macintosh II Ressurection

Probably at least better than the G5 era. I would think that by the time they bulged and/or leaked, they would be at least about 20 years old!

Yeah, they did last a while. I know the IIfx, IIcx, IIci, Classic II and a few other random models suffer from bad motherboard caps. The LC and LC II suffer from bad power supply caps. Interestingly the SE I picked up tonight works fine sans the Miniscribe hard drive.

[Topcat]

Re: Macintosh II Ressurection

The G4 and G5 would have Nichicon HM and HN series caps.

....or UCC KZJ....or Rubycon MCZ.... I've recapped hundreds of those boards.

[lti]

Re: Macintosh II Ressurection

The caps that leak are surface mount electrolytics. I don't see any on that board.

The G4 and G5 would have Nichicon HM and HN series caps.

[RJARRRPCGP]

Re: Macintosh II Ressurection

Just a heads up the rest of the motherboard probably will need a recap. Apple's capacitors of that time were utter crap and have a tendency to leak.

Probably at least better than the G5 era. I would think that by the time they bulged and/or leaked, they would be at least about 20 years old!

The Nichicon caps in G5s (and possibly G4s) have a tendency to bulge and leak within a few years. (Or at best, 6 years)

[stj]

Re: Macintosh II Ressurection

maybe sticky this attachement someplace.

[Topcat]

Re: Macintosh II Ressurection

While I was at it, I tried out the printer. The ribbon is dried out, print was very light. I doubt you can even get a replacement for it anymore....but it did print!!

Some MS word doc that was on the system....





Glare reducer cleaned up. This system must have been near a window when it was used, much of the plastic has the classic UV yellowing...the glare reducer was the worst.

[Topcat]

Re: Macintosh II Ressurection

most of the old mac's i'v seen are all tantalum.

There are a few axial lytics, all nichicon. Don't remember the series, but were 470uF 16v. None appeared to be leaking, but we know how that goes around Badcaps.net....thanks for the heads-up compgeek. The caps in the PSU were all UCC.

[stj]

Re: Macintosh II Ressurection

most of the old mac's i'v seen are all tantalum.