The Macintosh IIci has a cluster of five surface mount electrolytic capacitors near the startup circuit at the top left of the board (as per the orientation below). As a result, a Mac IIci with capacitor leakage will often result in a computer that won’t startup at all. If you have a Mac IIci and it hasn’t been recapped, you must get it done before it’s too late. The images shown below have a light blue radial capacitor at the top left that should not be there. It was put there by one of the previous owners and on a normal IIci board would be a 47µf 16V surface mount electrolytic capacitor.

Replacement components

• 10µf 16V KEMET tantalum capacitors (T491C106K016AT)
• 47µf 16V KEMET tantalum capacitors (T491D476K016AT)
• 220µf 16V Vishay axial capacitors (MAL213825221E3)
• 470µf 16V Vishay axial capacitors (MAL211835471E3)

Recapping guides

Address & Data line matrix

For those who might have a Macintosh IIci with some capacitor- or battery-assisted trace corrosion, here is a link to a Google sheets document with all the locations to test the address and data lines for continuity. All care taken, but no guarantees that it’s 100% error-free.