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Disassembling Macintosh IIsi Power Supply
User-Contributed Guide
This guide is not managed by iFixit staff.
- Author: Chris Green
- Time required: 15 - 30 Minutes
- Difficulty: Moderate
The Macintosh IIsi Uses a 120/240V AC Power Supply. It provides power directly to the logic board. From there, it is distributed to the rest of the computer.
Sections
- Top Case 2 steps
- Floppy Drive 2 steps
- System Fan 2 steps
- Power Supply 2 steps
- View:
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Edit Step 4 ¶
Flip the drive so it is on top of the power supply, and remove the "Red-Ribbon" cable.
1.44MB floppy drives need a ribbon cable with a red stripe on one side. 400KB floppy drives use a ribbon cable with a yellow stripe on one side. 800KB floppy drives can use a red, or yellow striped cable.
This drive was manufactured by Sony in 1990.

Edit Step 6 ¶
In all of the years that I have worked on this machine, I have found no good way to remove the fan.
The best way to start, is to push in here on the side of the fan.
Being careful not to exert too much force, try to push in, and wiggle the fan outward as such. (2nd Photo)
You can now lift the fan all the way out, and remove it.
The Fan Power Contacts on the Logic Board:

Edit Step 7
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Power Supply
¶
To remove the power supply, squeeze these two tabs and lift the front up.
On the back of the power supply, there is a tab that also must be pressed to remove the power supply fully. You can then lift it out all the way. A firm tug may be necessary to seperate the power connector.
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