Macintosh SE/30

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."

Revision 630-4198-11 Logic Board

Capacitor Specifications and Footprint Information

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

Mouser Project for Analog board parts

Sony CR-44 PSU

Note model numbers and board revisions here

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
C162	1	620 µF	400 V	Through-Hole	40mm	43mm	14mm	0 °C
C164, C165	2	4.7	350 V	Through-Hole	16mm	26mm	7.5mm
C168	1	100	16 V	Through-Hole	6mm	12mm	5mm
C257	1	4700	16 V	Through-Hole	16mm	32mm	7.5mm
C258	1	6800	10 V	Through-Hole	16mm	32mm	7.5mm
C259, C264, C279	3	470	16 V	Through-Hole	10mm	12mm	5mm
C261, C263, C266	3	2200	16 V	Through-Hole	13mm	26mm	5mm
C262	1	3300	10 V	Through-Hole	13mm	26mm	5mm
C265	1	47	25 V	Through-Hole	5mm	12mm	5mm
C269	1	1	50 V	Through-Hole	5mm	12mm	5mm
C270, C275, C276	3	22	25 V	Through-Hole	5mm	12mm	5mm

Replacement Parts

Revision 630-4198-11 Logic Board

Capacitor Specifications and Footprint Information

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	DigiKey Mouser LCSC
C2	1	470	16	Through-Hole	10mm D/18mm L	Aluminum Electrolytic (Axial)	Vishay	118 AHT	DigiKey Mouser
C6	1	1	50	SMD	6mm L	Tantalum	KEMET	T491	DigiKey Mouser LCSC
C11	1	220	16	Through-Hole	8mm D/18mm L	Aluminum Electrolytic (Axial)	Vishay	138 AML	DigiKey Mouser LCSC

Related Links

Macintosh SE & SE/30 Analog Board Recapping Walkthrough - YouTube

Macintosh SE/30 SONY Power Supply Recapping Walkthrough - YouTube