Lenovo ThinkCentre A51 Hardware Maintenance Manual - Page 98
Locating, connectors, computer, Removing, cover - express
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Locating connectors on the rear of the computer The following illustration shows locations of connectors on the rear of the computer. 1 PCI connectors 2 PCI Express (x1) connector 3 PCI Express (x16) graphics connector 4 Ethernet connector 5 USB connectors 6 Mouse connector 7 Parallel connector 8 Serial connector (some models) 9 Diagnostic LEDs 10 Power connector 11 Audio line out connector 12 Audio line in connector 13 VGA monitor connector 14 Serial connector 15 Keyboard connector 16 USB connectors Removing the cover Attention Read Chapter 2, "Safety information," on page 5 and "Handling electrostatic discharge-sensitive devices" on page 8"Handling electrostatic discharge-sensitive devices" on page 314 before opening the cover. 92 Hardware Maintenance Manual