Macintosh SE/30

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Macintosh SE/30
Preliminary Information
Release Year 1989
Leak Risk High
Batteries Yes, Potentially Destructive
Mounting Technology Through Hole (Analog Board, Logic Board), SMD (Logic Board)
Capacitor Types Aluminum Electrolytic
Destructive Entry No
CRT Guides
General Information · Repair Cautions

The Macintosh SE/30 was sold by Apple Computer from January 1989 to October 1991. Like all Macintoshes of its era, its original surface-mount electrolytic capacitors leak their contents and require replacing for both functionality and to protect critical traces on its circuit board from being eaten by electrolyte.

Known Issues

Maxell Battery "Bombs"

Causes
Apple placed a small lithium battery on the Macintosh SE/30's Logic Board to power and preserve the contents of the Parameter RAM (PRAM). Apple used a number of different brands of battery for this purpose, one of which is Maxell. Maxell lithium batteries are notorious for rupturing in storage and spewing its highly corrosive contents all over the board, which usually travels onto the Logic Board retaining bracket and rusts out that part as well. If your Macintosh SE/30 is still intact with its original PRAM battery, THE BATTERY MUST BE REMOVED IMMEDIATELY, even if it is not Maxell brand.
Solutions
Macintosh SE/30s with exploded PRAM batteries are pretty much irreparable, save for replacing the entire Logic Board.

Original Parts

From the now-defunct 68kMLA Wiki: "Some logic board revisions may have a different number of capacitors, so make sure to look first and verify this information."[1]

Revision 630-4198-11 Logic Board

Capacitor Specifications and Footprint Information[1][2]
RefDes Qty Capacitance (µF) Voltage (V) Mount Size Type Brand
C1, C3, C4, C5, C7, C8, C9, C10, C12, C13 10 47 16 SMD Aluminum Electrolytic Unbranded
C2 1 470 16 Through-Hole Aluminum Electrolytic (Axial) Nippon Chemi-Con
C6 1 1 50 SMD Aluminum Electrolytic Unbranded
C11 1 220 16 Through-Hole Aluminum Electrolytic (Axial) Nippon Chemi-Con

Replacement Parts

Revision 630-4198-11 Logic Board

Capacitor Specifications and Footprint Information[2]
RefDes Qty Capacitance (µF) Voltage (V) Mount Size Type Brand Series Distributor Link(s)
C1, C3, C4, C5, C7, C8, C9, C10, C12, C13 10 47 16 SMD 7.3mm L Tantalum KEMET T491 Mouser
C2 1 470 16 Through-Hole 10mm D/18mm L Aluminum Electrolytic (Axial) Vishay 118 AHT Mouser
C6 1 1 50 SMD 6mm L Tantalum KEMET T491 Mouser
C11 1 220 16 Through-Hole 8mm D/18mm L Aluminum Electrolytic (Axial) Vishay 138 AML Mouser

References

  1. 1.0 1.1 "Capacitor Replacement". 68kMLA Wiki. Archived from the original on August 24, 2017. Content licensed under GNU FDL.
  2. 2.0 2.1 "Macintosh SE/30". Recap-a-Mac.