Specifications

Power Mac G5 (Late 2005) Troubleshooting — General Information 142

Location of Bus Bar Tabs and Terminals

Note: This is a top view of the main logic board with the processor module removed. You must

test the voltages with the processor module installed.

MLB Power Bus Bar

Voltage Positive Lead Ground Lead

3.3 V Tab 1 Tab 4

5.1 V Tab 2 Tab 4

0 V Tab 3 Tab 4

0 V Tab 4 Tab 5

0 V Tab 5 Tab 4

0 V Tab 6 Tab 4

0 V Tab 7 Tab 4

12 VDC Tab 8 Tab 4

12 VDC Tab 9 Tab 4

Nominal Min Max

+3.3 VDC 3.14 VDC 3.48 VDC

+5.1 VDC 4.85 VDC 5.35 VDC

+12 VDC 11.4 VDC 12.60 VDC