A while ago, This does not compute had a few nice videos on a Mac SE/30 and it’s repair, including the recap process of replacing the electrolytic capacitors (or condensators in some other languages), and cleaning the board (some wash it with hot water and soap, others with isopropyl-alcohol, often called rubbing alcohol).
Note the simasimac can have many causes: bad capacitors in main board are the most common, but it can also be bad memory.
White lithium grease can make the floppy work again (see also [WayBack] Lithium soap – Wikipedia and [WayBack] Grease (lubricant) – Wikipedia).
He also added some links to which I added some quotes and WayBack links:
- [WayBack] Bringing a Zebra Stripe SE/30 Back to Life from simasimac
Bringing a Zebra Stripe SE/30 Back to Life, Paul Brierley, The ‘Book Beat, 2009.02.19. The Japanese call it Simasimac, the horizontal striped pattern that indicates your Mac is terminal.
- [WayBack] Macintosh Schematics with many schematics including:
Macintosh SE/30 – IIcx (without NuBus)
- [WayBack] Page 1-> 68030, 68881/882, PDS
- [WayBack] Page 2-> ROM Simm, RAM Adr. Mux.
- [WayBack] Page 3-> GLUE Chip, RAM Simm
- [WayBack] Page 4-> VIA1, VIA2, RTC, ADB
- [WayBack] Page 5-> Video Interface
- [WayBack] Page 6-> SCSI, SWIM
- [WayBack] Page 6a-> SCSI, SWIM Page 2
- [WayBack] Page 7-> RS422, ASC, SONY Snd
- [WayBack] Page 8-> Power Conn.,
- [WayBack] Mac SE/30 | Low End Mac
- [WayBack] Mac ROM-inator II | Big Mess o’ Wires
The Mac ROM-inator II replaces the stock Macintosh ROM SIMM with a custom flash memory module. Add a bootable ROM disk, make your system 32-bit clean, gain HD20 hard disk support, and more. The Mac ROM-inator II supports the Macintosh SE/30, IIx, IIcx, IIci, IIfx, and IIsi.
The Mac ROM-inator II is fully assembled and ready to use. Just plug it in and go.
Mac ROM-inator II Atom, $42
2 MB SIMM pre-programmed with ROM Disk with System 7.1, HDSC Setup, ResEdit, and SCSI Probe. Compatible with Mac SE/30, IIx, IIcx, IIci, IIfx, IIsi. More InfoThe Mac ROM-inator II is great for breathing new life into your old SE/30 or II-series Macintosh. The ROM disk provides fast and convenient boot-ups and a collection of disk utility programs, and customized startup sounds and icons add a touch of fun. The ROM SIMM comes pre-programmed with a BMOW-made custom ROM containing the following changes:
- ROM disk provides a diskless booting option
- HD20 hard disk support built-in
- 32-bit clean – allows use of System 7.6+ and more than 8MB RAM
- Memory test is disabled for faster booting on 16MB+ systems
- Customized startup chime – major 9th arpeggio
- Happy Mac icon is replaced by a color smiling “pirate” Mac
- New startup menu screen displays installed RAM, addressing mode, and ROM disk details
The ROM-inator II is based on Doug Brown’s earlier [WayBack] Mac ROM SIMM design, used with permission.
- [WayBack] Retr0Bright (or RetroBright) treated plastics re-yellowing even with minimal light exposure?
- [WayBack] Forums – 68kMLA Forums
- [WayBack] Macintosh SE/30
The SE/30 is probably the most popular candidate for recapping. Unfortunately, it’s also one of the more difficult to revive as the leaked electrolyte easily damages traces and vias on these boards. Be sure to wash these boards very well and inspect closely for broken or rotten traces.
Capacitor List:
10 – 47µf – 16V – SMT
1 – 220µf – 16V – Axial
1 – 470µf – 16V – Axial
1 – 1µf – 50V – SMT
Click on the photo for a larger view
Notes
Desolder can be tricky, especially for surface mount. This helps:
- Add some fresh 60/40 solder to the joints with a solder gun (as modern solder is lead free, whereas past solder contained lead)
- Carefully heat up the component and surrounding area with a heat-gun
Choosing capacitors:
Soldering: always add some fresh solder on the pads before soldering surface mount (SMD) capacitors.
–jeroen
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Nice videos about USB-C receptacles replacement that might fit old 
The Wiert Corner - irregular stream of stuff 
