4-4 SPARCstation 5 Service Manual—November 1996
4
4.2.1 Power Supply Test
1. Use a VOM (volt-ohmmeter) to check the power supply output voltages.
Place the VOM negative probe on one of the logic ground pins in the
connector, and test the +12V, -12V, and +5V power pins individually with
the positive probe (pins 1 through 8). See Figure 4-1 and Table 4-2.
Note – The power supply must remain connected to the system board during
this test. This allows the power supply to regulate the voltages.
2. Replace the power supply assembly if any of the voltages are not present.
See Section 8.1, “Power Supply.”
Figure 4-1 Power Supply Connector
Table 4-2 shows the pin assignments on the power supply connector.
19
10 18
2
11 1314 1612 15 17
3456 87
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