Power Supply Test - Sun Microsystems Ultra 1 Series Service Manual

Power Supply Test

Use a VOM (volt-ohm-milliammeter) to check the power supply output voltages. The
power supply connectors J2601 and J2603 must remain connected to the system
board.
Place the VOM negative probe on one of the Gnd (ground) pins in the connector, and
test the +12v, -12v, +5v, +3.3v and +3.0v power pins individually with the VOM
positive probe.
See Table 4–1 and Table 4–2 for power supply connector pin descriptions.
Figure 4–1 Power Supply Connector J2601
J2601 Pin Descriptions
TABLE 4–1
Pin Description
1 +12V
2 Gnd
3 Power on
4
5
6 +3V sense
7 +3V set
8 +3V ovp
Pin Description
9 Thermal sensor
10 -12V
11 Power off
12
13
14 Gnd
15 Thermal sensor
16 Power on reset
Troubleshooting Procedures
19