Zenith Data Systems Z-171 PC Series Service Manual page 28

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Installation
Final Connections
Make sure that the line select switch, located in the external AC adapter,
is properly set for the AC power source. Refer to Figure 2-8.
WARNING: The AC adapter contains dangerous high-voltages. Use ex-
treme care when opening this unit.
1. Make sure that the AC adapter is disconnected from the AC power
source and the computer.
Remove the 4 screws from the cover and lift the cover off the power
supply.
Locate the voltage selector jumper.
Select the appropriate setting.
Return the cover and install the screws.