NEC MH4500 manual Static Precautions, Troubleshooting Checklists, 5-2Solving Problems

This chapter helps you identify and solve problems that may occur during system installation or while using your system. The first part of this chapter tells you how to reset your system in case of problems. The next several parts provide troubleshooting checklists and procedural steps that help you isolate specific system problems. The last part includes BIOS and system and disk status user information.

!WARNING

The DC push-button on/off switch on the front panel does not turn off system AC power. Also, +5 Vdc is present on the system board whenever the AC power cords are connected between the system and an AC outlet. Before doing any procedures, make sure that your system is powered off and the power cords are unplugged from the back of the chassis. Failure to disconnect power before opening your system can result in personal injury and equipment damage.

!CAUTION

Operating your system with the access cover removed can damage system components. For proper cooling and airflow, always replace the access cover before powering on your system.

Static Precautions

An electrostatic discharge (ESD) can damage disk drives, option boards, and other components. You can provide some ESD protection by wearing an antistatic wrist strap attached to chassis ground when handling system components.

Electronic devices can be easily damaged by static electricity. To prevent damage, keep them in their protective packaging when they are not installed in your system.

Troubleshooting Checklists

The following provides troubleshooting checklists for problems that occur at initial system startup, when you run new application software, and after the system hardware and software were running correctly.

5-2 Solving Problems