from 110V to 220V

[slomacuser]

Did anybody tried to mod the 110V Compact 128/512k Mac to get it work on 220V?

I red somwhere that you just have to cut the jumper on the analog board.

I tried with cutting the W12 on the analog board ... but it didnt worked

 

[tomlee59]

I have seen the same documentation that you have. None of the early compacts that I've opened, however, had the ability to switch between these two mains voltages with a simple jumper change. Perhaps ones sold outside the US had this ability, but I've never encountered one here.

 

[Mac128]

Yikes! Yes Tom I would say that is the case. Larry Pina describes it in some detail. In order to use 220v you MUST have the 240v power supply. There were two models of the 128k/512k, one contained the international 240v power supply and the other contained the 120v. If you have the latter, there is no way to convert it to 220v without adding extra parts and I'm not even sure it could be done without modifying the 120v analogue board. If you have the 240v "International" marked clearly on the vinyl jacket, then you might be able to change the circuit to accept 120v since it was designed to be convertible. But that is not what you want to do. If you find you have a 220v international power supply in your Mac, but are currently using it as a 120v, then yes, you should be able to easily change something to switch it back to 240v. That is the most likely reference I can think you may be referring to having seen around the internet.

 

[tomlee59]

I'll rummage through my docs to check, but I think that the Inside Macintosh series may be the source of some misinformation. ISTR that the Hardware Reference leaves the impression that there is only one power supply that works for all, save for the jumper. But my memory was never any good, and it hasn't gotten any better with age, so I will have to double check this to be certain.

Slomacuser -- I recommend not experimenting with high mains voltages until this gets cleared up. You run the risk of liberating much magic smoke.

 

[Mac128]

I don't know about Inside Macintosh, but Macintosh Family Hardware Reference indicates there may have been 3 power supplies. US & International versions in 128K/512K and switchable voltage universal supplies in the Mac Plus: about which it says the input voltage range is configured by closing switch SW1 on the analogue board for 120 V operation. Now correct me if I'm wrong but isn't SW1 the power switch? Either way, I seem to recall reading somewhere that the MacPlus (or at least later models) incorporated a universal power supply, while the older Macs/models were 120 only or both. The main thing is to determine which board he has and it's possible some later 512Ks had the dual board and not to preclude the possibility the original was replaced with a newer universal. He'll need to crack it open and get the part number for the analogue board for starters.

 

[slomacuser]

I think you are right, the 128k and 512k can not be made to work on 220V ...

Looks like the Plus and latest had that universal PSU, like SE that got 240V

Picture of the 128k board

thanks for clearing that ... only way to work 110V mac on 220V is to replace the analog board or buy stepdown transformer

 

[equill]

Looking at the backs of my own machines, synthesizing from the above, and failing to refind the Apple kbase article, I suggest that it goes:

Macintosh, 128K, 512K, 512Ke: 120V or 240V.

Plus: probably 120V or 240V, since the 512Ke was so. (The 'Macintosh Minus' was released after the Macintosh Plus.) There is a separate 240-V (661-76214) power-sweep board available for Macintosh to Plus.

SE: same analogue board/power supply (661-0371/661-0370) as the SE/30, so ... ?

SE/30: autoranging, and saying so in red on a sticker behind the Mac.

Classic, Classic II: back to 120V (661-0597) or 240V (661-0599), an economy(?) measure.

IIcx, IIci and after: take autoranging for granted (661-0467 PSU with no special sticker), but 110-240V is in the moulded-in model spec. panel.

That leaves II and IIx unaccounted for, but likely to have been autoranging (661-0375 PSU).

However, contrary to that orderly(?) sequence is that the Portrait Display (1989) is autoranging, but the Multiple Scan 14 Display (1996) is 120V or 240V.

In short, one best reads what is on the back of the machine or device, or finds a Service Source manual.

de

 

[wgoodf]

thanks for clearing that ... only way to work 110V mac on 220V is to replace the analog board or buy stepdown transformer

buy the stepdown transformer - they can be handy to have as you go along collecting old stuff too.

 

[macdownunder]

In short, one best reads what is on the back of the machine or device, or finds a Service Source manual.

Yes - one interesting Mac that is NOT autoranging is the TAM!

It actually requires you to switch a hard switch from 110-220V which I discovered in a very unfortunate way. (Only Mac to do so?) All fixed now thanks to a good circuit level repairer I know.

Regards,

Macdownunder

 

[equill]

Yes - one interesting Mac that is NOT autoranging is the TAM! It actually requires you to switch a hard switch from 110-220V ...

And ditto for at least one of the clones, viz. a PowerTower Pro 225 that I have. However, it became fairly obvious, because I had to find, buy and install the PSU into a shell that was empty of all but the logic board.

de

 

[Mac128]

Apple Support holds many answers to our questions:

http://docs.info.apple.com/article.html?artnum=4336