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.

Image 1/2: There may or may not be a Phillips #0 screw here, depending on whether or not the computer has ever been serviced. Image 2/2: 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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Image 1/3: You can now seperate the top of the computer from the rest of the machine. Image 2/3: You can now seperate the top of the computer from the rest of the machine. Image 3/3: 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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Image 1/3: Push these two tabs out, and lift the drive up. Image 2/3: Push these two tabs out, and lift the drive up. Image 3/3: 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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Image 1/3: 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. Image 2/3: This drive was manufactured by Sony in 1990. Image 3/3: 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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Image 1/1:
  • The fan recieves power from two contacts on the logic board and has no connector.

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Image 1/3: The best way to start, is to push in here on the side of the fan. Image 2/3: Being careful not to exert too much force, try to push in, and wiggle the fan outward as such. (2nd Photo) Image 3/3: You can now lift the fan all the way out, and remove it.
  • 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

Image 1/2: 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. Image 2/2: 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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Image 1/2: It was made by Sony in 1990, and uses a 10-Pin power connector. Image 2/2: 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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