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Safe Working Procedures and General Maintenance

May 14, 2007

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This chapter is from the book 

ASTURIAS:ATS DESKTOP & PORT SYST_p3, 3rd Edition

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iMac Power Supply

A number of iMac computer models contain a power supply board that requires extra caution. These models include:

iMac (iSight)
iMac (Early 2006)
iMac (Mid 2006 17-inch)
iMac (Late 2006)

Click to view larger image

The AC/DC power supply board is a high-voltage source when the unit is under power, and remains powered up whenever the system is plugged in, whether or not the system is turned on. The voltages pose a potential hazard to your personal safety.

Observe these precautions:

Make sure the unit is unplugged when working on it with the front bezel removed. Never work on or near the power supply with the unit powered on.
Never work alone. In the event of an electrical shock, it is important to have someone present who can provide assistance.
Keep one hand in your pocket or behind your back when working on any computer that is plugged in. This will help ensure that your body does not provide a path to ground in the event that you accidentally make contact with the line voltage.
Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a risk if they accidentally make contact with the power supply circuitry.

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