Identifying SE Logic Boards

Before you begin,

  • Remove the cover
  • Discharge the CRT
  • Remove the logic board

IWM/SWIM Chip

Two logic boards are available as exchange modules for the Macintosh SE. If you are replacing the logic board of an SE that was originally shipped with a 1.4 MB SuperDrive, use logic board 661-0536. If you are replacing the logic board of an SE that was originally shipped with an 800K floppy drive, or an SE that has been upgraded to use a 1.4 MB SuperDrive, use replacement logic board 661-0526.

Battery Logic Board Ibook

Follow these guidelines to help identify the correct exchange module:

  • If the customer's battery is installed in a battery holder, use replacement logic board 661-0536.
  • If the customer's battery is soldered to the logic board, check the part number on the customer's disk controller chip. (See the following procedure.)
Logic Board Number Picture

If the disk controller is an IWM chip (the part number is not 3440062), use replacement logic board 661-0526. If the disk controller is a SWIM chip (part number 344-0062), use replacement logic board 661-0526 and swap the customer's SWIM chip and ROM chips for the IWM chip and ROM chips on the replacement board. (See the following procedure.)

Macintosh Superdrive

Note: Failure to transfer the customer's SWIM chip and upgraded ROM chips to the replacement logic board will prevent a 1.4 MB SuperDrive from using high-density media.

1 Using an IC extractor, remove these chips from the customer's logic board and install them on the replacement logic board:

  • SWIM (344-0062) at D8
  • High ROM (342-0701) at D6
  • Low ROM (342-0702) at D7

Note: The notch at one end of the SWIM chip and each ROM chip must face toward the RAM SIMMs.

2 Return the ROMs and IWM chip to Apple on the faulty logic board.

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Responses

  • niamh gordon
    Where is the computer chip on a macintosh se logic board?
    7 years ago

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