Manuale d’uso / di manutenzione del prodotto dx2450 del fabbricante HP (Hewlett-Packard)
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Service Reference Guide HP Compaq dx2450 Business PC.
© Copyright 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. Microsoft and Windows are trade marks of Microsoft Corporation in the U.
Table of contents 1 Installing and Customizing the Softwar e Install ing the Operat ing Sys tem ..... ................ ............... ............... ............... ................ ............. ...... ...... 1 Install ing or Upgr ading Devi ce Driver s .
Chassis Designation .................. ............... ............... ............... ................... ............... .......... ........... ..... 18 Microtower (MT) .................. ............... ............. ............... ...............
Speaker ........... ........... ........... ........... ............. ........... ........... ........... ............ ............ ..... ............ ........... 62 Rear Chassis Fan ................ ............... ............... ............... ...
Appendix D System Board and Riser Board Reference Designato rs .......... .................... ..................... .................... ............ .................... ..................... ............ ........... ......... 92 Appendix E Specifications Index .
1 Installing and Customizing the Software NOTE: If the comput er was shipped wit h Windows Vista load ed, you will be pro mpted to register t he computer with HP Total Care before instal ling the operatin g system. You will see a brief movie fo llowed by an online registration form.
HP Backup and Recovery Manager The HP Backup and Recov ery Manager is an easy-to -use, versatile applicatio n that allows you to back up and recover the primary ha rd drive on the PC. The application works within Windows to create backups of Windows, all a pplications, and al l data files.
2 Computer Setup (F10) Utility Computer Setup (F10) Utilities Use Computer Setup (F10) Utility to do the following: ● Change factory default settings. ● Set the system date and time. ● Set, view, change, or verify the sy stem configurat ion, including set tings for graphics, au dio, storage, communications, and input devices.
● Boot ● Exit Use the a rrow keys t o select the appropriate heading, th en press Enter . Use the arrow (up and down) keys to select the op tion you want , then press Enter .
● Memory Bank 4 ● BIOS Revision ● Core Versio n ● Model Number ● Product Number ● Asset Tag (press Enter to change) Computer Setup—Advanced NOTE: Support fo r specific Computer Setup o p tions may vary depen ding on the hardware configuration.
Onboard LAN Boot ROM Allows you to disable/enable the boot ROM of the onboard LAN chip. SATA Controlle r Allows you to set: ● Disable d ● SATA1 ● SATA1+2 Onboard A udio Allows you to set the onb.
Computer Setup—Boot NOTE: Support fo r specific Computer Setup o p tions may vary depen ding on the hardware configuration. Table 2-4 Computer Setup—Boot Option Description Boot-time D iagnostic Screen Disables/enables POST di agnostic me ssages display.
Recovering the Configuration Settings To reset all BIO S Setup options to their default values (including options for ctrl+F10 ), you must enter F10 Setup mode an d press F5 . This does not in clude updates to system date , system time , supervis or password , user password , and CPU frequency multiplier .
3 Computer Diagnostic Features HP Insight Diagnostics NOTE: HP Insight Diag nostics is included on CD with some computer models o nly. The HP Insight Diagnostics utili ty allows you to view information abou t the hardware configuration of the computer and perform hardware diagnostic tests on the subsyst ems of the computer.
6. Shut down the operating system and turn off the computer. 7. Turn on the computer. The system will boot to the CD. NOTE: If the system does not boot to the CD in th e optical drive, you may need to.
Test Tab The Test tab allows you to choose various parts of the system to test. You can also choose the type of test and testing mode. There are three types of tests to cho ose from: ● Quick Tes t .
After testing has completed, the Cancel Testing button is replaced with a Retest button. The Retest button will retest th e last set of tests execut ed.
Saving and Printing Informatio n in HP Insight Diagnostics You can save the information displayed in the HP Insigh t Diagnostics Survey and Log tabs to a d iskette or a USB 2.
HP Backup and Recovery Manager The HP Backup and Recov ery Manager is an easy-to -use, versatile applicatio n that allows you to back up and recover the primary ha rd drive on the PC. The application works within Windows to create backups of Windows, all a pplications, and al l data files.
4 Serial and Parallel ATA Drive Guidelines and Features NOTE: Serial ATA = SATA Parallel ATA = PATA SATA Hard Drives Serial ATA Hard Drive Characteristics Number of pins/conductors in data cable 7/7 Number of pins in power cab le 15 Maximum data cable length 39.
SATA Hard Drive Cables SATA Data Cable Always use an HP approved SAT A 3.0 Gb/s cable a s it is fully ba ckwards compat ible with the SATA 1.5 Gb/s drives. Current HP deskt op products ship with SATA 3.0 Gb/s hard dr ives. SATA data cables are susceptible to da mage if ov erflexed.
PATA Device Information The USDT model is the only prod uct that supports a PATA optical dr ive. No PATA drives are supported on any other mode l. ATA SMART Drives The Self Monitoring Anal ysis and Re.
5 Identifying the Chassis, Routine Care, and Disassembly Preparation This chapter provides general service i nformation for the computer. Ad herence to t he procedures and precautions described in this chap ter is essential for proper service.
Electrostatic Discharge Information A sudden discharge of sta tic electric ity from your finger or other co nductor can destroy stat ic-sensitive devices or microcircuitry.
● Avoid contact with pins, leads, or circu itry. ● Place reusable el ectrostatic-sens itive parts from assemblies in protective packaging or conductive foam.
● Conducti ve foam ● Conductive tablet op workstations with gr ound cord of one-megohm +/- 10% resistance ● Static-dissipative table or floor mats with hard tie to ground ● Field service kits .
Routine Care General Cleaning Safety Precauti ons 1. Never use solvents or flammable solutions to clea n the computer. 2. Never immerse any parts in water or cleaning solutions; a pply any liquids to a cle an cloth and then use the cloth on the component.
● If you remove a key, use a specially desi gned ke y puller to prevent damage to the keys. This too l is available through many electronic supply ou tlets. CAUTION: Never re move a wide leveled key (like the spa ce bar) from the keyboard. If these keys are improperly removed or installe d, the keyboard may not function properly.
● Diagnostics software ● HP tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527- 001) or HP tamper- resistant bits (Smart Co ver FailSafe Key, PN 166527-002) Screws The screws used in the computer are not interchang eable. They may have standard or metric thre ads and may be of diffe rent lengths.
Lithium Coin Cell Battery The battery that comes with the comp uter provides power to th e real-time clock and has a minimum lifetime of abou t three years. See the appropriat e removal and replacement chapter for the cha ssis you are working on in this guide for instructions on the repl acement procedures.
6 Removal and Replacement Procedures Microtower (MT) Chassis Adherence to the procedures and precautions described in this c hapter is essential for proper servi ce. After completing all nece ssary removal and replacem ent procedures, run the Di agnostics utility to verify that all components operate p r operly.
Preparation for Disassembly See Identifying the Ch assis, Routine Care, and Disassembly Preparati on on page 18 for initi al safety procedures. 1. Remove/disengage any secu rity devices that prohibit opening the computer ( External Security Devices on page 28 ).
External Security Devices The following secu rity devices are used to preven t unauthori zed access to the internal components of the computer and/or se cure the computer to a fixed obj ect.
HP Business PC Security Lock 1. Fasten the security cable by loo p ing it around a stationary object. 2. Thread the keyboa rd and mouse cable s through the lock.
3. Screw the lock to the chassis using the screw prov ided. 4. Insert the plug en d of the security cable into the lock (1) and push the button in (2) to enga ge the lock.
Computer Access Panel 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ). CAUTION: Be fore removing th e computer access pane l, ensure tha t the computer is turned off and that the power cord is discon nected from the electrical outlet.
Front Bezel 1. Prepare the co mputer for disasse mbly ( Preparation for Disassembly on page 27 ). 2. Remove the computer access panel ( Computer Access Panel on page 31 ). 3. Press outward on the three latches on th e right side of the bezel (1) , then rota te the right side of the bezel off the chassis (2) followed by the left side.
Removing Bezel Blanks On some models, there are bezel bl anks covering the 3.5-inch an d 5.25-inch external drive bays tha t need to be removed befo re installing a drive. To remove a bezel blank: 1. Remove the front bezel. 2. To remove a 5.25-inch bl ank, break the blank out of the bezel (1) .
Cable Management Always follow good cabl e management practices when working inside the computer. ● Keep cables away fro m major heat sources like th e heatsink. ● Do not jam ca bles on top of exp ansion cards or memory modules. Printed circuit car ds like thes e are not designed to take excessive pressure on them.
Cable Connections System board connectors are colo r-coded to make it ea sier to find the prope r connectio n. System Board Connections System Board Connector Name Connector Color Description ATXPOWER.
Memory The computer comes wi th double data ra te 2 synchronous d ynamic random access memo ry (DDR2- SDRAM) dual inline me mory modules (DIMMs). The memory sockets on the system board can be po pulated with up to four industry- standard DIMMs. These memory sockets are popul ated with at leas t one pre installed DIMM.
Item Description Socket Color 1 DIMM socket XMM1, Channel A (populate first) Black 2 DIMM socket XMM2, Channel B (populate second) Black 3 DIMM socket XMM3, Channel A Blue 4 DIMM socket XMM4, Channel B Blue The system will automatically operate in single channel mode or dual channel mode, depending on how the DIMMs are installed.
CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it is important to use memo ry module s with gold metal contacts to pr event corrosion and/or oxidati on resulting from having in compatible metals in co ntact with each other.
Expansion Cards The computer has one standard PCI expansion slot that ca n accommodate an ex pansion card up to 17.46 cm (6.875 inches) in length . The computer also has two PCI Express x1 exp ansion slots and one PCI Express x16 expansion slot.
4. On the rear of the com puter, a slot cover lock secures the expansion card brackets in place. Remove the screw from the slot cover lock then slide the slot cover lock up to remove it from the chassis. 5. Before installing an expa nsion card, remove the expansion slot cover or the existing expansion card.
b. If you are removing a standard PCI card, hold the card at e ach end and carefully rock it back and forth until the connectors pull free fro m the socket.
8. To install a new expansion card, hold the card just above the expansion socket on the system board then move the card toward the rear of the ch assis so that the bottom of the bracket on the card slides into the small slot on the chassis. Press the card straig ht down into the expansion socket on the system board.
Drives When installing a dditional drives, follow th ese guidelines: ● The primary Serial ATA (SATA) ha rd drive must be connected to the d ark blue primary SAT A connector on the system b oard labeled SATA0. ● Connect the first SATA optical dr ive to the wh ite SATA connector on the system board labeled SATA1.
CAUTION: To preve nt loss of work and dama ge to the computer o r drive: If you are inserting or removi ng a drive, shut down th e ope rating system properly, turn off th e computer, and unplug the power co rd. Do not remove a d rive while the computer is on o r in standby mode .
No. System Board Connector System Board Label Color 5 SATA3 SATA 3 orange 6 Diskette Drive FLOPPY black To verify the type, size, and capacity of the stor age devices installed in the computer, run Computer Setup. Refer to Computer Setup (F10) Utility on page 3 for more information.
Removing an Optical Drive CAUTION: All removable media shoul d be taken out of a drive before removing the drive from th e computer. To remove an optical drive: 1. Prepare the co mputer for disasse mbly ( Preparation for Disassembly on page 27 ). 2. Remove the computer access panel ( Computer Access Panel on page 31 ).
Installing an Optical Drive in to the 5.25-inch Drive Bay To install an optio n al 5.25-inch optica l drive: 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ). 2. Remove the computer ac cess panel ( Computer Access Panel on page 31 ).
9. Connect the p ower cable (1) and data cable (2) to the rear of the optical drive. 10. Replace th e front bezel and acc ess panel. 11. Lock any security device s that were disengaged when the access pane l was removed. The system automaticall y recognizes the drive and reconfigures the computer.
4. Disconnect the drive cables, a s indicated in the following illustrations: a. If you are removing a diskette drive, disconnect the data cable (1) and power cable (2) from the back of the dr ive. b. If you are removing a media card reader, disconnect the U SB cable from the system board.
5. Remove the reta iner screws that secure the drive to the bay (1) then slide the drive fo rward and out of the bay (2) . Installing a Drive into the 3. 5-inch External Drive Bay The 3.5-inch ex ternal drive ba y on the front of the computer can be configur ed with a media card rea der or a diskette drive.
7. Slide the drive in through the front of the chassis (1) until the bezel on the drive is evenly aligned with the computer fron t bezel and in stall the M3 metric retainer screws (2) as shown in the illustration below. NOTE: Extra drive retainer screws are p rovided on th e interior of the fro nt bezel if needed.
Removing an Internal 3.5-inch Hard Drive NOTE: Before you remov e the old hard drive, be sure to back up th e data from the old ha rd drive so that you can transfer the data to the new hard driv e.
5. Lift the hard disk drive cage out of the chassis. 6. Disconnec t the power cable (1) and data cable (2) from the back of the hard drive. Drives 53.
7. Remove the four screws that secure the hard disk drive to t he hard disk drive cage (1) , then slide the hard disk drive ou t of the hard disk dri ve cage (2) . Installing an Internal 3.5-inch Hard Drive 1. Follow the steps in Removi ng an Internal 3.
2. Slide the new drive into th e hard disk drive cage (1) , aligning the drive with the four screw ho les on the cage. Install the four 6-32 standard screws that secure the hard disk drive to th e hard disk drive cage (2) . Make sure the hard disk drive cables are facing the top of the drive cage .
4. Place the hard disk d rive cage into the chassis (1) , then slide it down to ward the bottom of the chassis until it locks into place (2) . 5. Attach the two screws that secure th e hard disk drive cage to the chassis. 6. If installing a new drive, connect the opposit e end of the data cable to th e appropriate system board connector.
NOTE: If you are replacing the primary hard drive, use th e Recovery Disc Set to restore the operating system, software drivers, and any software applicat ions that were preinstalled on the computer. Front USB Panel 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ).
Power Switch/LED Assembly 1. Prepare the co mputer for disasse mbly ( Preparation for Disassembly on page 27 ). 2. Remove the computer access panel ( Computer Access Panel on page 31 ). 3. Remove the front bezel ( Fron t Bezel on page 32 ). 4. Remove the optical drive ( Removing an Optical Drive on page 46 ).
Heatsink You will need a screw driver with a narrow shaft to loosen the heatsink screws. 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ). 2. Remove the computer ac cess panel ( Computer Access Panel on page 31 ).
To remove the backplat e from the system bo ard: 1. Remove the four silver Phillips screws that secure the ba ckplate to the system board. 2. Remove the backplate from the system board.
Processor 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ). 2. Remove the computer ac cess panel ( Computer Access Panel on page 31 ). 3. Remove the heatsink ( Heatsink on page 59 ). 4. Rotate the locking le ver to its full open positio n (1) .
5. If using a n ew heatsink, remove th e protective cov ering from the bottom of the he atsink and place it in position atop the processor. 6. Secure the heat sink to the system board an d syste m board tray with the four captive screws and attach the heatsink contro l cable to the system board.
When replacing the speaker, be sure to route the wi re behind the ha rd drive cage bracket, through the metal clamp on the chassis, through the metal cla m p on the side of the second hard drive cage, and then down to the system board. Rear Chassis Fan 1.
Power Supply 1. Prepare the co mputer for disasse mbly ( Preparation for Disassembly on page 27 ). 2. Remove the computer access panel ( Computer Access Panel on page 31 ). 3. Disconnect all power cables from the drives and from the system board. 4. Remove the four silver T 15 screws that co nnect the power supply to the chassis.
To install the po wer supply, reverse the remova l procedure. System Board 1. Prepare the comp uter for disas sembly ( Preparat ion for Disas sembly on page 27 ). 2. Remove the computer ac cess panel ( Computer Access Panel on page 31 ). 3. Remove all expa nsion boards ( Expansion Cards on page 39 ).
Battery The battery that comes with the computer provide s power to the real-time cl ock. When replacing the battery, use a battery equivalent to the battery origin ally installed in the com puter. The comput er comes with a 3-volt lithium coin cell battery.
Type 1 Battery Holder 1. Lift the battery out of its holder. 2. Slide the replacement battery in to position, positive side up. 3. The battery holder au tomatically secures the battery in the proper posi tion. 4. Replace the computer acc ess panel. 5.
4. Plug in the comp uter and turn on power to the computer. 5. Reset the date and time and any special system s etups using Computer Setup. Refer to C omputer Setup (F10) Utility on page 3 . Type 3 Battery Holder 1. Pull back on the clip (1) that holds the battery in place, then remove the battery (2) .
A Connector Pin Assignments This appendix contains the pin assignments for ma ny computer and workstation connectors. Some of these connectors may no t be used on the product being serviced.
Ethernet RJ-45 Connector and Icon Pin Sign al 1 2 3 4 (+) Transmit Data (-) Transmit Data (+) Receive Da ta Unused 5 6 7 8 Unused (-) Receive Data Unused Unused Ethernet AUI Connector and Icon Pin Sig.
Parallel Interface Connector a nd Icon Pin Signal Pin Signal 1 2 3 4 Strobe Data Bit 0 Data Bit 1 Data Bit 2 10 11 12 13 Acknowledge Busy Paper End Select 5 6 7 8 Data Bit 3 Data Bit 4 Data Bit 5 Data.
USB Connector and Icon Pin Signal 1 2 3 4 +5 VDC - Data + Data Ground Microphone Connector and Icon (1 /8” miniphone) Pin Signal 1 2 3 1 (Tip) 2 (Ring) 3 (Shield) Audio_left Power_Right Audio_right .
External Infrared Transceiver Connector a nd Icon Pin Signal 1 2 3 4 Transmit Receive Ground 5V 5 6 7 8 Mode Not Used Not Used Not Used Monitor Connector a nd Icon Pin Signal Pin Signal 1 2 3 4 Red An.
ATA/ATAPI (IDE) Standard Drive Cable Connector Pin Signal Pin Signal Pin Signal 1 2 3 4 Reset Ground DD7 DD8 15 16 17 18 DD1 DD14 DD0 DD15 29 30 31 32 DMAK Ground INTRQ IOCS16 5 6 7 8 DD6 DD9 DD5 DD10.
CD-ROM 50-Pin Connector Connector Pin Signal Pin Signal Pin Signal Pin Signal 1 2 3 4 Audio L-ch Audio R-ch Audio GND GND 14 15 16 17 DD12 DD3 DD13 DD2 27 28 29 30 IORDY DMACK INTRQ IOCS 16 40 41 42 4.
24-Pin MicroFit Power Connector 24 12 13 1 F ront Pin Signal Pin Signal Pin Signal Pin Si gnal 1 2 3 4 5 6 +5 Vaux GND +5V +5V PS_ON GND 7 8 9 10 11 12 PWRGD +3.3V +3.3V Tach GND Fan-CMD 13 14 15 16 17 18 +12V +5V Sense GND +5V +5V +3.3V 19 20 21 22 23 24 GND +3.
SATA Data and Power Drive Connector Pin Signal Pin Signal Pin Signal Pin Signal S1 S5 Ground B- S2 S6 A+ B+ S3 S7 A- Ground S4 Ground P1 P5 P9 P13 Ground B- V 5 V 12 P2 P6 P10 P14 V 3.
52 53 54 55 PERp8 PERN8 GND GND 57 58 59 60 PERn9 GND GND PERp10 62 63 64 65 GND GND PERp11 PERn11 67 68 69 70 GND PERp12 PERn12 GND 72 73 74 75 PERp13 PERn13 GND GND 76 77 78 79 80 PERp14 PERn14 GND .
52 53 54 55 GND GND PETp9 PETn9 57 58 59 60 GND PETp10 PETn10 GND 62 63 64 65 PETp11 PETn11 GND GND 67 68 69 70 PETn12 GND GND PETp13 72 73 74 75 GND GND PETp14 PETn14 76 77 78 79 80 GND GND PETp15 PE.
31 32 33 34 36 36 PETn0 SMB_DATA PETp0 GND GND USB_D- 37 38 39 40 41 42 Reserved* USB_D+ Reserved* GND Reserved* LED_WWAN# 43 44 45 46 47 48 Reserved* LED_WLAN# Reserved* LED_WPAN# Reserved* +1.
B Power Cord Set Requirements The power supplies on some computers have external power switches. T he voltage select switch feature on the computer permits it to operate fro m any line voltage between 100 -120 or 220-240 volts AC.
Country-Specific Requirements Additional requ irements specific to a countr y are shown in parentheses and explained below. Country Accrediting Agenc y Country Accrediting Agen cy Australia (1) Austri.
C Troubleshooting Safety and Comfort WARNING! Misuse of the c omputer or failure to e stab lish a safe and comfort abl e work environment may result in disco mfort or serious injury. Refer to the Safety & Comfort Guide available on the We b site at http://www.
To assist you in resolving problems online, HP In stan t Support Professional Edition pro vides you with self-solve diag nostics. If you need to contact HP su pport, use HP Inst ant Support Profes sional Edition's online chat fea ture. Access HP Instant Support Pro fessional Edition at: http://www.
● If you have installed an operating syste m other than the factory-installed operating system, check to be sure that it is supported on the system. ● If the system has multiple vi deo sources (em.
Computer will not respond to USB keyboard or mouse. Cause Solution Keyboard or mouse is not connected to co mputer. Connect keyboard and mouse cables to computer. Computer is in standby mode. To resume from standby mod e, press the power button or press any key.
Poor performance is experienced. Cause Solution Too many applications running. 1. Close unnecessary applications to free up memory. Some applications run in the background and can be closed by right-clicking on their correspon ding icons in the task tray.
Computer is beeping and will no t start. Cause Solution Internal error has occurred and the computer is bee ping a code. Refer to Interpreting POST Audible Codes on page 90 to interpret the error code.
Computer will not start. Cause Solution Wrong memory modules were used in the upgr ade or memory modules were installed in the wrong location. 1. Review the documentation that came with the system to determine if you are using the corre ct memory modules and to verify the proper installation.
Interpreting POST Audible Codes This section covers th e audible codes that may o ccur before or during POST that do not ne cessarily have an error code o r text message associ ated with them. WARNING! When the computer is plug ged into an AC power sou rce, voltage is always appl ied to the system board.
Contacting Customer Support For help and service, contact an authorized reseller or dealer. To locate a reseller or deal er near you, visit http://www.hp.com . NOTE: If you take th e computer to an au thorized re seller, dealer, or service provider for service, remember to provide the setup and power-on passwords if they a re set.
D System Board and Riser Board Reference Designators These reference designators a re used on most but not al l HP system and riser boards. Designator Component BAT CR1 CR2 CR3 CR4 Battery socket/Batt.
J38 J39 J40 Secondary SCSI connector Stacked parallel/SCSI connector AGP sl ot J41 J50 J51 J52 J53 x16 PCI Express slot for graphics First parallel port Second parallel port Double-stacked parallel po.
L3 L4 L5 P1 USB rear port choke (2nd) USB rear port choke (3rd) USB front port choke (2nd) P/S connector (20 or 24 pin ) P2 P3 P4 P5 P6 Second P/S connector (as required) Processor 12V header Secondar.
P54 P55 P58 P60 P61 Primary serial port Double stack serial port, Top = Serial B, Bottom = Serial A Riser edge connector (male-mates with J30) PrimarySerial ATA (SATA) connector Second Serial ATA (SAT.
U4 U5 South bridge Super I/O U6 U7 U10 U11 U12 Clock ch ip 64 bit Bridge LOM1 LOM1 EEPROM LOM1 PHY U13 U14 U16 U17 U18 Audio Codec Audio amplifier LOM2 LOM2 EEPROM LOM2 PHY U19 U20 U21 U29 U30 U31 SPI.
Y4 Y5/H5 Secondary NIC clock cr ystal RTC clock crystal/tie-down 97.
E Specifications Table E-1 Spec ificatio ns Desktop Dimensions Height Width Depth 16.37 in 7.24 in 14.95 in 41.58 cm 18.40 cm 37.98 cm Approximate Weight 20.26 lb 9.19 kg Temperature R ange Operating Nonoperating 50° to 104°F -22° to 140°F 10° to 40°C -30° to 60°C Relative Humidity (noncondensing) Operating Nonoperating (38.
Rated Input Current (maxim um) 1 8A @ 100 VAC 4A @ 200 VAC 1 This system utilizes a passive power factor corrected po wer supply. The power factor correction is present in the 230V operating mode only. T his allows the system to pass the CE ma rk requirements for use in the countries of the European Union.
Index Symbols/Numerics 24-pin MicroFit pow er pin assignments 76 24-pin power pin ass ignments 75 4-pin power pin a ssignments 76 6-pin power pin a ssignments 76 A ATA/ATAPI (IDE) drive cable pin assi.
M media card read er installing 50 removing 48 memory removal and repl acement 36 microphone pin assign ments 72 monitor pin assignments 73 mouse cleaning 23 pin assignments 69 O operating guidelines .
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il HP (Hewlett-Packard) dx2450 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del HP (Hewlett-Packard) dx2450 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso HP (Hewlett-Packard) dx2450 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul HP (Hewlett-Packard) dx2450 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il HP (Hewlett-Packard) dx2450, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del HP (Hewlett-Packard) dx2450.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il HP (Hewlett-Packard) dx2450. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo HP (Hewlett-Packard) dx2450 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
