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3. Troubleshoot the Power Supply
Use this procedure when the fan is not rotating and the LCD display is not turned on.
Measure the Output Voltages of Power Supplies
If all output voltages are within the limits, the power supply is veri ed with 100% con dence.
a. Turn the E4915A/E4916A power o .
b. Remove the outer cover of the E4915A/E4916A.
c. Remove the output cable assembly from the power supply CN4 and CN5.
d. Turn the E4915A/E4916A power on.
e. Measure the output voltages at the V4 (to GND G3), V3 (to GND G2), V2 (to GND G2), V1 (to
GND G1) pins using a voltmeter with a small probe.
f. If the output voltages are unexpected, replace the power supply.
Figure 3-1. Power Supply Output Pins
Table 3-1. Power Supply Output Voltages
Connector Pin Output Voltage
V4 to G3(GND)
V3 to G2(GND)
V2 to G2(GND)
V1 to G1(GND)
Range
+24 V
+21.6 V to +26.4 V
15 V
13.5 V to 16.5 V
+15 V
+13.5 V to +16.5 V
+5 V
4.5 V to +5.5 V
Troubleshooting 3-3
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