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Chapter 6 Maintenance
ZyWALL USG 20-2000 User’s Guide
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6.6.1 What Can Go Wrong
When you run a shell script, the ZyWALL processes the file line-by-line. The ZyWALL checks the first
line and applies the line if no errors are detected. Then it continues with the next line. If the
ZyWALL finds an error, it stops applying the shell script.
If you want the ZyWALL to ignore any errors in the shell script and applies all of the valid
commands, include setenv stop-on-error off in the shell script. The shell script will keep
running regardless of error. You can still find the logs for shell script errors.
6.7 How to Change a Power Module
This tutorial applies only to USG 2000.
The ZyWALL has two power modules. It can continue operating on a single power module if one
fails. The power modules are near the top of the front panel of the main chassis. Obtain ZyWALL
power modules from your local vendor. Use the following procedure to change a power module.
1 Make sure that the power module you want to disconnect has the power switch in the off position.
You only need to turn off the power module that has failed. The ZyWALL can continue operating on
power from the other power module.
2 Disconnect the power cord from the power outlet.
3 Disconnect the power cord from the ZyWALL’s power module.
4 Use a Phillips screwdriver to remove the power module’s retaining screw.
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