Dell PowerEdge 2600 Service Manual

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Dell PowerEdge 2600 Service Manual Manual pdf 22 page image

Back to Contents PageJumpers and ConnectorsDell™ PowerEdge™ 2600 Systems Service ManualJumpers—A General ExplanationSystem Board JumpersSystem Board ConnectorsSCSI Backplane Board ConnectorsDisabling a Forgotten PasswordThis section provides specific information about the system jumpers. It also provides some basic information on jumpers and switches and describes theconnectors on the various boards in the system.Jumpers—A General ExplanationJumpers provide a convenient and reversible way of reconfiguring the circuitry on a printed circuit board. When reconfiguring the system, you may need tochange jumper settings on circuit boards or drives.JumpersJumpers are small blocks on a circuit board with two or more pins emerging from them. Plastic plugs containing a wire fit down over the pins. The wire connectsthe pins and creates a circuit. To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated. Figure 5-1 shows anexample of a jumper.Figure 5-1. Example JumpersA jumper is referred to as open or unjumpered when the plug is pushed down over only one pin or if there is no plug at all. When the plug is pushed downover two pins, the jumper is referred to as jumpered. The jumper setting is often shown in text as two numbers, such as 1-2. The number 1 is printed on thecircuit board so that you can identify each pin number based on the location of pin 1.Figure 5-2 shows the location and default settings of the system jumper blocks. See Table 5-1 for the designations, default settings, and functions of thesystem's jumpers.System Board JumpersFigure 5-2 shows the location of the configuration jumpers on the system board. Table 5-1 lists the jumpers settings.Figure 5-2. System Board JumpersTable 5-1. System Board Jumper SettingsCAUTION: Ensure that the system is turned off before you change a jumper setting. Otherwise, damage to the system or unpredictable resultsmay occur.