Power problems

vFollow the suggested actions in the order in which they are listed in the Action column until the problem is solved.

vSee the parts listing in the Problem Determination and Service Guide to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU).

vIf an action step is preceded by “(Trained service technician only),” that step must be performed only by a trained service technician.

Symptom

Action

 

 

 

The power-control button does

1. Make sure that the power-control button is working correctly:

not work, and the reset button

a. Disconnect the server power cords.

does work (the server does not

b. Reconnect the power cords.

start).

Note: The power-control button

c.

Press the power-control button.

will not function until 20

d. If the server does not start, disconnect the server power cords and reseat

seconds after the server has

 

the operator information panel cables; then, repeat steps 1b through 1c. If

been connected to ac power.

 

 

the problem remains, replace the operator information panel.

 

 

 

2. Make sure that:

 

v The ac power cord is correctly connected to the server and to a working

 

 

electrical outlet.

 

v The server contains the correct type of DIMMs.

 

v The DIMMs are correctly seated.

 

v (Trained service technician only) The microprocessor is correctly installed.

 

3. If you just installed an optional device, remove it, and restart the server. If the

 

server now starts, you might have installed more devices than the power supply

 

supports.

 

4. Reseat the following components:

 

a. DIMMs

 

b. (Trained service technician only) Power-supply cables to all internal

 

 

components

 

c. (Trained service technician only) Power connector on the system board

 

5. Replace the following components one at a time, in the order shown, restarting

 

the server each time:

 

a. DIMMs

 

b. (Trained service technician only) Power supply

 

c. (Trained service technician only) System board

 

6. See “Solving undetermined problems” in the Problem Determination and

 

Service Guide.

 

 

 

The server does not turn off.

1. Determine whether you are using an Advanced Configuration and Power

 

 

Interface (ACPI) or a non-ACPI operating system. If you are using a non-ACPI

 

operating system, complete the following steps:

 

a.

Press Ctrl+Alt+Delete.

 

b. Turn off the server by pressing the power-control button for 5 seconds.

 

c.

Restart the server.

 

d. If the server fails POST and the power-control button does not work,

 

 

disconnect the ac power cord for 20 seconds; then, reconnect the ac power

 

 

cord and restart the server.

 

2. If the problem remains or if you are using an ACPI-aware operating system,

 

suspect the system board.

 

 

The server unexpectedly shuts

Call for service.

down, and the LEDs on the

 

 

operator information panel are

 

 

not lit.

 

 

 

 

 

Chapter 5. Solving problems 45

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IBM 4364, 4365 manual Power problems

4364, 4365 specifications

The IBM 4365 and 4364 are significant models in IBM’s lineup of mainframe computers, designed primarily for large organizations requiring robust processing capabilities. These models emerged during the late 1980s and early 1990s, serving to enhance the performance and versatility of business computing environments.

The IBM 4365, launched in 1985, is known for its sophisticated architecture and large processing power, capable of managing substantial transaction volumes. It features the advanced Multiple Virtual Storage (MVS) operating system, which allows for efficient processing and management of numerous tasks simultaneously. The MVS system contributes to high reliability and availability, factors paramount for businesses that rely on uninterrupted service.

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In contrast, the IBM 4364, released slightly later, is a more modest version aimed at smaller organizations but still renowned for its reliable performance. It too operates the MVS operating system, but its configurations are tailored for less intensive processing needs. It is designed with cost-effectiveness in mind, making it suitable for businesses that require robust computing without the extensive capabilities of larger systems.

Both models benefit from IBM's robust security features, ensuring data protection and compliance with industry standards. Additionally, they offer significant storage options, utilizing IBM's innovative storage technologies to retain vast amounts of data efficiently.

Among the key technologies that defined these mainframes were the use of advanced input/output capabilities and compatibility with a broad range of peripheral devices. This integration allowed organizations to enhance productivity while maintaining seamless operations across various applications.

Overall, the IBM 4365 and 4364 exemplify the evolution of mainframe technology during their era, offering remarkable processing power, superior reliability, and scalability while paving the way for future innovations in enterprise computing. Their legacy remains influential in shaping the landscape of business technology today, as organizations continue to rely on mainframe processing for critical operations.