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Re: The daemon Mac IIci: Can it be fixed?
Posted: 08 Jun 2023 14:18
by stephen_usher
The ROM SIMM has finally arrived. This is a good thing as I don't know how long the original, damaged ROMs will last as several pins have had to be strengthened with solder or replaced.
Re: The daemon Mac IIci: Can it be fixed?
Posted: 08 Jun 2023 15:05
by rubber_jonnie
stephen_usher wrote: 08 Jun 2023 14:18
The ROM SIMM has finally arrived. This is a good thing as I don't know how long the original, damaged ROMs will last as several pins have had to be strengthened with solder or replaced.
So aside from the floppy, what's next on the path to recovery? Final clean up and conformal coating? Any work need doing to the case?
Re: The daemon Mac IIci: Can it be fixed?
Posted: 08 Jun 2023 20:37
by stephen_usher
The next thing is the power supply.
When first powered up the display doesn't really start properly, as in the voltage levels are too low. It slowly brightens over the next couple of minutes. There are no capacitors between the FRB chip, the RAMDAC and the video socket so it has to be the main voltages. I did smell some fish from the power supply but I opened it up and the Nichicon caps look OK, but I'm going to replace them all. I've made a list and I'll need to buy some. There are also two tiny RIFAs in there!
Re: The daemon Mac IIci: Can it be fixed?
Posted: 08 Jun 2023 22:33
by rubber_jonnie
stephen_usher wrote: 08 Jun 2023 20:37
The next thing is the power supply.
When first powered up the display doesn't really start properly, as in the voltage levels are too low. It slowly brightens over the next couple of minutes. There are no capacitors between the FRB chip, the RAMDAC and the video socket so it has to be the main voltages. I did smell some fish from the power supply but I opened it up and the Nichicon caps look OK, but I'm going to replace them all. I've made a list and I'll need to buy some. There are also two tiny RIFAs in there!
Hmm sounds fishy to me...
I'd definitely want to get those electrolytics done in the PSU.
Re: The daemon Mac IIci: Can it be fixed?
Posted: 09 Jun 2023 21:24
by stephen_usher
Well, the ROM SIMM works. Just need to find a replacement floppy drive now.
Re: The daemon Mac IIci: Can it be fixed?
Posted: 09 Jun 2023 21:32
by rubber_jonnie
stephen_usher wrote: 09 Jun 2023 21:24
Well, the ROM SIMM works. Just need to find a replacement floppy drive now.
sounds like things are coming along nicely :)
Re: The daemon Mac IIci: Can it be fixed?
Posted: 09 Jun 2023 21:40
by stephen_usher
rubber_jonnie wrote: 09 Jun 2023 21:32
stephen_usher wrote: 09 Jun 2023 21:24
Well, the ROM SIMM works. Just need to find a replacement floppy drive now.
sounds like things are coming along nicely :)
Yeah. Well, I also need a set of caps for the PSU, but that's easy to get from RS or Farnell, probably more the latter as RS seem to be running down their stocks of passives and ICs.
Re: The daemon Mac IIci: Can it be fixed?
Posted: 09 Jun 2023 22:06
by stephen_usher
Looks like Mac 1.44 SuperDrives are not common any more. eBay only seems to have broken ones in the USA for quite a lot of money.
Re: The daemon Mac IIci: Can it be fixed?
Posted: 09 Jun 2023 22:17
by stephen_usher
I've been soak testing with Crystal Quest...
- IMG_3167.jpeg (261.58 KiB) Viewed 985 times
Re: The daemon Mac IIci: Can it be fixed?
Posted: 10 Jun 2023 03:03
by Tomswork
For the battle of the psu this is handy to have
Tom
https://github.com/GeorgeRudolf/OldMacATX
@rubber_jonnie