Apple IMAC User Manual - Page 85
Power Flow, Power Supply Board Fuse, General/ Power Flow - 3
UPC - 067540444435
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Troubleshooting General/ Power Flow - 3 Power Flow Power is controlled in the iMac system by the power supply board. Once the unit is plugged in, power flows from the AC outlet at the wall to the AC inlet on the power supply board. From there, the power flows through the power filter board and on to the analog/video board, the logic board, and all its attached components. Click here to view an animation of how power flows through the iMac. Power Supply Board Fuse There is a fuse on the AC line on the power supply board (at F901) that can be replaced if the computer has no power. (Refer to the "No Power" symptom for a full troubleshooting scenario.) Before replacing the fuse, you should do a continuity test with an ohm meter. If the ohm meter registers "0", the fuse is good. If the meter registers "infinite," the fuse should be replaced. Refer to "Testing for Power" later in this chapter for instructions on how to check the power supply board fuse. Refer to "Logic Board" in the Take Apart chapter to locate the fuse on the power supply board.