Acer Aspire 7739 Service Manual page 66

Pre-disassembly Instructions
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Before proceeding with the disassembly procedure, make sure to do the following:
1. Turn off the power to the system and all peripherals.
2. Unplug the AC adapter and all power and signal cables from the system.
Figure 3-1. AC Adapter
3. Place the system on a flat, stable surface.
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