Introduction

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.

Parts

No parts required.

Start by turning the computer around, and remove this #0 Phillips Screw. There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced.
  • Start by turning the computer around, and remove this #0 Phillips Screw.

  • There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced.

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Now lift these two clips, and slowly pivot the case up. You can now seperate the top of the computer from the rest of the machine. You can now seperate the top of the computer from the rest of the machine.
  • Now lift these two clips, and slowly pivot the case up.

  • You can now seperate the top of the computer from the rest of the machine.

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The "SuperDrive" is mounted similarly to the hard drive, and positioned right next to it. Push these two tabs out, and lift the drive up. Push these two tabs out, and lift the drive up.
  • The "SuperDrive" is mounted similarly to the hard drive, and positioned right next to it.

  • Push these two tabs out, and lift the drive up.

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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.
  • 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.

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The fan recieves power from two contacts on the logic board and has no connector.
  • The fan recieves power from two contacts on the logic board and has no connector.

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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)
  • 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:

There is no need to pull out the fan. Just take a knife and you can squeeze the tab in step 7

Willy Kaiser - Reply

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.
  • 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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Information on the power supply: It was made by Sony in 1990, and uses a 10-Pin power connector.
  • Information on the power supply:

  • It was made by Sony in 1990, and uses a 10-Pin power connector.

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Conclusion

To reassemble your device, follow these instructions in reverse order.

Chris Green

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