Use the round ground-prong of the ac plug on ac-operated computers.

Grounding requirements

Electrical grounding of the PC Server Rack and computers is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician.

Problem determination tips

Due to the variety of hardware and software combinations that can be encountered, use the following information to assist you in problem determination. If possible, have this information available when requesting assistance from Service Support and Engineering functions.

Machine type and model

Processor or hard disk upgrades

Failure symptom

Do diagnostics fail?

What, when, where, single, or multiple systems?

Is the failure repeatable?

Has this configuration ever worked?

If it has been working, what changes were made prior to it failing?

Is this the original reported failure?

Reference/Diagnostics diskette version

Type and version level

Hardware configuration

Print (print screen) configuration currently in use

BIOS level

Operating system software

Type and version level

CAUTION:

Important:

To eliminate confusion, identical systems are considered identical only if they:

1.Are the exact machine type and model

2.Have the same BIOS level

3.Have the same adapters/attachments in the same locations

4.Have the same address jumpers/terminators/cabling

5.Have the same software versions and levels

6.Have the same Reference/Diagnostics Diskette (version)

7.Have the same configuration options set in the system

8.Have the same setup for the operation system control files

Comparing the configuration and software set-up between "working and non- working" systems will often lead to problem resolution.

194Hardware Maintenance Manual: IBM PC Server/Enterprise Racks

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IBM 4SA, 9TX, 9TS, 9QX, 9QS, 900, 4SB, 42P, 42X, 200, 42E, 42S, 4QS, 4QX manual Grounding requirements, Problem determination tips