Dell 4100 Installation And Troubleshooting Manual

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Dell 4100 Installation And Troubleshooting Manual Manual pdf 123 page image

Jumpers and Switches C-1Appendix CJumpers and SwitchesThis appendix provides specific information about thejumpers on the system board. It also provides some basicinformation on jumpers and switches and describes theconnectors and sockets on the various boards in thecomputer.Jumpers and Switches—A General ExplanationJumpers and switches provide a convenient and revers-ible way of reconfiguring the circuitry on a printed circuitboard. When reconfiguring the system, you may need tochange jumper settings on the system board. You mayalso need to change jumper and/or switch settings onexpansion cards or drives.JumpersTo change a jumper setting, pull the plug off its pin(s)and carefully fit it down onto the pin(s) indicated.A jumper is referred to as open or unjumpered when theplug is pushed down over only one pin or if there is noplug at all. When the plug is pushed down over two pins,the jumper is referred to as jumpered. The jumper settingis often shown in text as two numbers, such as 1-2. Thenumber 1 is printed on the circuit board so that you canidentify each pin number based on the location of pin 1.Figure C-1 shows the location and default settings of thejumper blocks on the system board. See Table C-1 for thedesignations, default settings, and functions of the sys-tem’s jumpers.SwitchesSwitches control various circuits or functions in thecomputer system. The switches you are most likely toencounter are dual in-line package (DIP) switches, whichare normally packaged in groups of two or more switchesin a plastic case. Two common types of DIP switches areslide switches and rocker switches (see the followingillustration).Each of these switches has two positions, or settings(usually on and off). To change the setting of a slideswitch, use a small, pointed object such as a small screw-driver or a straightened paper clip to slide the switch tothe proper position. To change the setting of a rockerswitch, use the screwdriver or paper clip to press downCAUTION: Make sure the system is turned offbefore you change a jumper setting. Otherwise,damage to the system or unpredictable resultsmay occur.Jumpers are small blocks on a circuitboard with two or more pinsemerging from them.Plastic plugs containing a wire fitdown over the pins. The wire connectsthe pins and creates a circuit.slide switches rocker switches