ZyXEL Communications MS-7206, Руководство пользователя

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MS-7206 Hardware Installation Guide
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H A P T E R
10
Hardware Troubleshooting
This chapter explains how to troubleshoot the system hardware.
10.1 The PWR LED Does Not Turn On or Is Blinking
The PWR light blinks if the input power for the fans is not stable and is off if there is no input
power. The PWR light stays on if the input for the fans is normal.
10.2 The Fan Module ALM LED Is On
The ALM LED is on when at least one fan is turning too fast or too slow. Working fans emit a
low buzz and blow air. If the fans are not working properly, refer to Section 9.1 on page 71 for
instructions on changing the fan module or its fuse.
Table 19 PWR LED Troubleshooting
STEP CORRECTIVE ACTION
1 Make sure the power wires are properly connected to the power supply and the power
supply is operating normally. Make sure you are using the correct power source (refer to
Chapter 11 on page 79
). Make sure the power supply modules are turned ON. Refer to
Section 9.2 on page 73 .
3 The LED itself, the fan module, or the unit may be faulty; contact your vendor.