Dell OptiPlex 990 Mini-Tower Service Manual page 4

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8 Chassis Intrusion Switch........................................................................25
9 Speaker......................................................................................................27
10 Heat Sink..................................................................................................29
11 Coin-Cell Battery....................................................................................33
12 Power-Switch Cable..............................................................................35
13 Front Thermal Sensor............................................................................39
14 Chassis Fan.............................................................................................41
15 Input/Output Panel.................................................................................43
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Optiplex 990 small form factor

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