Ac adapter voltage test – Apple Mac PowerBook 550c User Manual
Page 173
Additional Procedures
AC Adapter Voltage Test - 6
AC Adapter Voltage Test
To test the AC adapter voltage:
• Use narrow test probes for the leads on your voltmeter.
• Make all measurements with the negative or common lead
touching the outer shield of the connector (ground).
• Use the following table to identify the connector pin
number, signal name, and DC voltage present.
Connector Pin
Signal
DC Voltage
1
VBATT
16.4–16.6V
2
VMAIN
16.4–16.6V
3
GND
0V
4
GND Sense
0V
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