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.
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.)
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:
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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