ROUTINE MAINTENANCE5-11Edition OneXC1000 Service5.6 MEASURING POWER AND GROUNDThe power and ground should be measured monthly. To check the powerand ground, perform the following steps:1. Open the rear doors of the XC1000.2. Locate the +5-Vdc and +12 Vdc-test points on the main distributionboard, as shown in Figure 5-5. Voltage test points for +5 Vdc and +12Vdc are located at the lower right corner of the main distributionboard. The test points are TP1 (return), TP2 (+5 Vdc), and TP3 (+12Vdc). A second set of test points is located at the lower middle of theboard. These test points are labeled TP6 (return), TP7 (+5 Vdc), andTP8 (+12 Vdc), and are provided for cabinet 2 in a dual-cabinetconfiguration.DISTRIBUTION BOARDFOR CABINET 2 ONLYTP8, RETURN TP3, +12 VDCJ43 J44 J45 J46 J47 J48 J49 J50TP2, +5 VDCTP1, RETURNTP7, +5 VDCTP6, +12 VDC FOR CABINET 1S1S2Figure 5-5. Main Distribution Board, Showing the Location of+5-Vdc and +12-Vdc Test Points.Avoid contact with the –48 Vdc bus bar and terminals.Contact with –48 Vdc can cause personal injury.Warning!3. Remove the cover to the power-distribution shelf.4. Locate the + and – points for the –48 Vdc power supply, as shown inFigure 5-6. Using a voltmeter, measure across the + and – points.Verify that the power source supplies 43 to 56 Vdc. When the positive,SECTION 5.6
