Compaq 4200 Family manual Fans, Temperature Sensing, Fan Interface

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Enclosure Power and Cooling 5–3

The fan mounting assembly is the element for mounting the second fan. This element has no power circuitry. It does contain a circuit board for processing signals to and from the fan.

Temperature Sensing

The power supply temperature sensor provides a temperature range signal to the EMU. The EMU can use this signal to set the fan speed.

Fan Interface

The fan mounts on the rear of the power supply. A power supply connector is the interface between the fan and the enclosure. The interface signals include:

1.Fan speed control from the EMU

2.Fan speed to the EMU through the power supply

3.Power supply high-speed enable

4.Fan operating voltage

Fans

The power supply-mounted fans cool the enclosure by circulating air through the enclosure and elements. The rate at which air moves, the airflow, determines the amount of cooling. This airflow is a function of fan speed (rpm). These fans, under the control of the EMU or the associated power supply, can operate at multiple speeds. This ensures that when the enclosure temperature changes, the fans can automatically adjust the airflow.

Should a fan fail, EMU and power supply circuitry automatically increase the speed of the operational fan to high speed. Simultaneously, the error condition is reported to the user in several ways.

NOTE: The failure of the power supply 12.5 VDC circuit disables the associated fan.

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Contents Enclosure 4200 Family LVD Disk Enclosures Page Contents Appendix a Glossary Index List of Figures List of Tables About This Guide Introducing the EnclosureStarting the Enclosure O ModuleEnclosure Power and Cooling Appendix B, SpecificationsDisk Drives Replacing CRUsDocumentation Conventions DescriptionSymbol Related Documents Related PublicationsChapter Introducing the EnclosureDisk Enclosure Features Disk Enclosure Rear ViewPower Supplies Scsi BusesHigh Availability Data IntegrityEnclosure Layout Status Monitoring and DisplayEMU Element Replacement CRU Replacement MethodsMajor Elements Element FunctionsPower Supply-Dual Power Supply-SingleFan ModuleConnecting the Scsi Bus Cables Starting the EnclosureScsi Bus Cables Description Part Number Meters FeetLength Description Meters Feet Applying Power Installing Scsi Bus CablesVerifying Operation Rear Status LEDs Module Module Power Protection Single-Bus ModuleScsi Bus Connectors Scsi Bus TerminationStatus Displays Replacing an I/O Module Scsi Address MapSingle-Bus Module LED Displays Disk Enclosure Bay AddressesDisk Drives Typical 1-Inch Disk DriveStatus Reporting Disk StatusDisk LED Status Displays Fault Status Drive Power Drive BlankReplacing a Disk Enclosure Power and Cooling Power Supply and Fan Assembly ComponentsEnclosure Power Power OptionsTemperature Sensing FansFan Interface Replacing a Power Supply or Fan Power Supply and Fan Status DisplaysNonoperational Status Replacing CRUs Ordering a Spare CRUBasic Replacement Procedures Common Replacement ProceduresBefore starting the replacement procedure ESD ProtectionReplacing CRUs Installing a Drive Blank Replacing a Drive with a Drive BlankInsert the drive blank part-way into the enclosure Regulatory Notices FCC Class B CertificationDenmark Safety Demco Country-Specific CertificationsSpecifications Appendix BFigure B-1. Dimensions-Vertical Orientation Table B-2 Element Physical Specifications Table B-1Environmental Specifications Table B-3 Operating SpecificationsTable B-4 Shipping or Short Term Storage Specifications Power Supply without fanPower Specifications Table B-5 AC and DC Power SpecificationsAC Power Specifications Ambient temperature GlossaryEMU RAID Scsi ID Index Enclosure 4200 Family LVD Disk Enclosures User Guide Index

4200 Family specifications

The Compaq 4200 Family represents a pivotal line of desktop computers designed by Compaq, aimed at fulfilling the increasing demand for reliable, efficient computing solutions in both business and home environments in the late 1990s. This series offered a diverse array of models, catering to varying levels of performance and user requirements, ultimately setting a standard for its time.

One of the standout features of the Compaq 4200 series was its robust performance, achieved through the integration of Intel Pentium processors, which delivered superior speed and multitasking capabilities. This made the 4200 family ideal for running productivity software, database applications, and everyday tasks efficiently. Depending on the model, users could choose configurations with varying clock speeds, allowing for tailored performance to meet specific user needs.

The Compaq 4200 Family also incorporated advanced technologies that enhanced user experience. Among these was the implementation of a high-capacity hard drive, which provided ample storage space for documents, applications, and multimedia files. This was complemented by increased RAM options, ensuring smooth performance and the ability to run multiple applications simultaneously without significant lag.

Graphics capabilities were another notable feature of the 4200 series. Many models offered integrated graphics options, allowing users to engage in light gaming and multimedia tasks without the need for additional hardware. Furthermore, the inclusion of PCI slots enabled users to upgrade their systems with dedicated graphics cards, enhancing visual performance for more demanding applications.

For connectivity, the Compaq 4200 Family included a variety of ports, such as USB, serial, and parallel connections, allowing users to easily connect peripherals like printers, scanners, and external storage devices. The inclusion of a built-in modem facilitated internet connectivity, making it convenient for users to access online resources.

Another characteristic of the Compaq 4200 series was its user-friendly design. The systems were constructed with accessibility in mind, featuring easy-to-open cases for upgrades and repairs. Additionally, Compaq provided comprehensive support resources, thereby ensuring that users could easily troubleshoot and maintain their systems.

In conclusion, the Compaq 4200 Family was emblematic of its era, showcasing a blend of impressive performance, flexibility, and user-centric design. It served a wide range of users, from professionals in corporate environments to families requiring dependable home computing solutions, making it a significant player in the landscape of late 1990s computing technology.