Dell Inspiron Lm Service Guide
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System Overview 1-1 Chapter 1 System Overview T he Dell® Latitude® LM P-100SD and LM P-133ST are high-performance multimedia portable computers that use the Intel® Pentium® microprocessor. This chapter provides an overview of the components and subsystems of these computers. The individual model names within the Dell Latitude LM portable family indi- cate the type and operating frequency of the microprocessor and display used in the computer. For example: •The Dell Latitude LM P-100SD contains a 100-MHz Pentium micro- processor and an SVGA (S) dual-scan (D) STN LCD. •The Dell Latitude LM P-133ST contains a 133-MHz Pentium micro- processor and an SVGA (S) active-matrix (T) TFT LCD. System Features In addition to the standard features found in IBM®-compatible portable com- puters, the Dell Latitude LM includes the following new and/or advanced features: •8 MB of nonremovable main memory on the main board. The memory capacity can be increased up to 40 MB by installing a matched pair of 4-, 8-, or 16-MB memory modules in the memory upgrade sockets on the main board. •An 11.3-inch dual-scan SVGA color display or a 12.1-inch active-matrix SVGA display. •42-WH lithium ion battery (nine cells). •256-KB SRAM level-2 external cache and 16-KB internal cache. •NeoMagic 2070 video controller supporting all video features with a PCI local bus. •Intel 430MX PCIset for system and PCI controller. •Built-in microphone and jacks for connecting external speakers, micro- phones, and headphones. •Two new diagnostics tests (infrared and audio). •An options bay that lets users replace the secondary lithium ion battery or diskette drive without turning off or rebooting the computer. This feature is sometimes called hot swapping. The CD-ROM can be inserted or removed while the computer is in suspend mode. This feature is sometimes called
1-2 Dell Latitude LM Systems Service Manual warm swapping. However, the CD-ROM must be in the computer before or during boot in order for the drivers to load. •Built-in serial infrared transmitter/receiver, effective to 1 m (3.3 ft). •Support for connecting an external diskette drive to the parallel connector on the I/O panel. Physical Description Figure 1-1. Front View of the Portable Computer Figure 1-2. Back View of the Portable Computer LCD assembly keyboard options bay touch pad latch (2) power button hard-disk drive bay main-battery compartment microphone status display panel power/suspend indicator touch pad button (2) display close button PS/2 connectorPC Card slots parallel port connector serial port connector I/O panel service tag numberAC adapter connector expansion connector infrared port monitor connector external microphone connector headphones/speakers connector
System Overview 1-3 Status Display . Figure 1-3. Status Display Panel The status display panel is located directly above the keyboard. This panel shows icons that indicate keyboard operation or suspend mode; CD-ROM, hard-disk drive, diskette drive, and PC Card activity; and status of the power source (AC power or batteries). Keyboard Indicators The following icons indicate the status of the keyboard and whether the com- puter is in suspend mode. Caps Lock Indicator Press < CAPS LOCK> to activate this feature. Press < CAPS LOCK> again to deactivate the feature. Num Lock Indicator Press < NUM LOCK> to activate this feature. Press < NUM LOCK> again to deactivate this feature. Pad Lock Indicator This indicator appears when the embedded keypad is active. To activate the embedded numeric keypad, press < FN>. Press to toggle between the cursor keys and number keys. Scroll Lock Indicator Press < SCROLL LOCK> to activate this feature. Press < SCROLL LOCK> again to deactivate this feature. Suspend Mode When all indicators are present and appear to be rolling the computer is in suspend mode. CD-ROM/Hard-Disk Drive Indicator This indicator blinks when data is being transferred to or from the CD-ROM or hard-disk drive.
1-4 Dell Latitude LM Systems Service Manual Diskette-Drive Access Indicator This indicator blinks when data is being transferred to or from the internal diskette drive. PC Card Indicator This indicator blinks when the computer is accessing data from an installed PC Card or Cards. AC Power Indicator This indicator appears when the computer is receiving power through an AC power adapter. •If the icon is present but not blinking, the computer is on but the battery is not charging. •If the icon is blinking, the computer is on and the battery is charging. Battery Activity Indicator This indicator appears when there are batteries in the computer. If the main battery is present, the upper triangle appears. If the secondary battery is present, the lower triangle appears. If either triangle is blink- ing, the battery is in use or charging. Battery Status Indicator The battery status indicator reflects the state of the main or secondary battery in the computer when the computer is off. No indicator means there is no battery (main or secondary) in the computer or, if present, the battery has been discharged.
System Overview 1-5 Battery Charge Gauge There is a battery charge gauge on the main and second- ary battery. When you press the battery test button (labeled “PUSH”), the appropriate indicator lights up for a few seconds to indicate the amount of charge remaining in the battery. Password CAUTION: Dell strongly recommends that the user back up the pass- word onto a diskette. If the user forgets the password and does not have it on diskette, the computer cannot be accessed. In that case, the com- puter must be returned to Dell at the user’s expense. Dell technicians will erase the password by shorting C146, recharge the CMOS battery, and send the computer back at the user’s expense. For the procedure to erase the password, see “Deleting the Password” in Chapter 4. •The AC power indicator with the battery status in- dicator means the battery is defective. •An indicator with one bar on the left means a battery is too hot. Allow the battery to cool to room temperature. •The AC power indicator with the battery status in- dicator and one bar means that the battery is too hot (40° C [104° F] or more) to start charging. Charg- ing starts automatically when the battery cools to below 40° C. •An indicator with no bars means that battery power is low (about 80 percent depleted). This is the first low- battery indication and the computer warns the user with three short, audible beeps. There are about 20 minutes of battery life remaining. •A blinking indicator with no bars means that battery power is critically low (about 95 percent depleted) and needs recharging. There are about 5 minutes of battery life remaining. •An indicator with bars on the right side of the icon indicates the percentage of battery life remaining. Each bar equals 10 percent of battery life.
1-6 Dell Latitude LM Systems Service Manual System Power The power button controls power to the system. The computer receives power from either the AC adapter connected to an AC power source or from up to two batteries. If you use the AC adapter, constant power is available to the computer. If you use one or two batteries, the system has built-in power management fea- tures that extend battery life by removing power from parts of the computer that are not being used. Power Conservation Attach the AC power adapter to the computer, whenever possible, to conserve battery power. When the AC adapter is attached, the battery is charged while the computer uses AC power. The Power Menu of the Setup program has power conservation features. When activated, each power conservation feature turns off or slows down one or more functions while the computer is idle. The power conservation features are as follows: •Standby mode — To activate this feature, select the STANDBY TIME-OUT option in the Power Menu of the Setup program. To deactivate the feature, move the cursor or press any key on the built-in or external keyboard. •Suspend mode — To activate this feature, press or set the SUSPEND TIME-OUT option in the Power Menu of the Setup program. When sus- pend mode is activated, the computer beeps once and the suspend mode indicator in the status display panel blinks every 4 seconds. To deactivate this feature, press any key on the built-in keyboard. NOTE: To conserve power when the computer is not in use, close the dis- play. If the display is closed and an external monitor is not connected, the computer beeps one time and goes into suspend mode. If the computer receives a modem call from an external modem while the display is closed, the computer answers the call unless it is in suspend-to-disk mode. To resume work, open the display. •Suspend-to-disk mode — To activate this feature, press or set the SUSPEND TO DISK TIME-OUT option in the Power Menu of the Setup program. To resume using the computer, press the power button on the built-in keyboard. •Dimming the display — To activate this feature, set the DIM MODE TIME-OUT option in the Power Menu of the Setup program. To increase the brightness of the dis- play, press any key on the built-in keyboard. •Turning off the hard-disk drive — To activate this feature, set the HARD-DISK TIME-OUT option in the Power Menu of the Setup program. The computer automati- cally turns the hard-disk drive back on the next time the microprocessor accesses the drive.
System Overview 1-7 Interrupt Assignments Table 1-1. Interrupt Assignments IRQ Line Used/Available IRQ0 Generated by the system timer IRQ1 Generated by the keyboard controller to signal that the key- board output buffer is full IRQ2 Cascade to second interrupt controller IRQ3 Used by the infrared port (COM2) IRQ4 Used by the serial port (COM1) IRQ5 Used by the audio controller IRQ6 Generated by the diskette drive controller to indicate that the diskette drive requires the attention of the microprocessor IRQ7 Used by the parallel port IRQ8 Generated by the system RTC IRQ9 Software redirect to INTOA IRQ10 Reserved IRQ11 Reserved IRQ12 Generated by the keyboard controller to indicate that the out- put buffer of the integrated touch pad or external PS/2 mouse is full IRQ13 Used by the math coprocessor on the microprocessor IRQ14 Generated by the hard-disk drive to indicate that the drive requires the attention of the microprocessor IRQ15 Reserved
1-8 Dell Latitude LM Systems Service Manual Technical Specifications Table 1-2. Technical Specifications Microprocessor Microprocessor type . . . . . . . . Intel Pentium microprocessor Microprocessor speed . . . . . . . 100 or 133 MHz Internal cache memory . . . . . . 16 KB External cache . . . . . . . . . . . . 256 KB Math coprocessor . . . . . . . . . . internal to the microprocessor Chip Set and Bus System chip set . . . . . . . . . . . . Intel 430MX PCIset Data bus width . . . . . . . . . . . . 64 bits DRAM bus width . . . . . . . . . . 64 bits Address bus width . . . . . . . . . 32 bits Flash EPROM. . . . . . . . . . . . . 2 Mbits PC Card PC Card connectors . . . . . . . . two (for two type I or type II cards or one type III card) Cards supported . . . . . . . . . . . 3.3- and 5-V PC Card connector size . . . . . 68 pins Data width (maximum) . . . . . 32 bits Memory Architecture . . . . . . . . . . . . . . fast-page mode, two-way interleaved Memory module capacities . . 4, 8, and 16 MB; must be installed in matched pairs Standard RAM . . . . . . . . . . . . 8 MB on system board Maximum RAM . . . . . . . . . . . 40 MB
System Overview 1-9 Memory (Continued) Memory access time: tRAC . . . . . . . . . . . . . . . . 70 ns tCAC . . . . . . . . . . . . . . . . 20 ns BIOS address . . . . . . . . . . . . . F000:0000 Connectors Serial (DTE) . . . . . . . . . . . . . . one 9-pin connector; 16,550-compatible, 16-byte buffer Parallel . . . . . . . . . . . . . . . . . . one 25-hole connector; unidirectional, bidirectional, EPP 1.9, or ECP Monitor . . . . . . . . . . . . . . . . . . one 15-hole connector PS/2 keyboard/mouse . . . . . . . one 6-pin mini-DIN Infrared . . . . . . . . . . . . . . . . . . one IrDA 1.0-compliant window Audio . . . . . . . . . . . . . . . . . . . microphone; headphones/speaker Audio Audio type. . . . . . . . . . . . . . . . SoundBlasterPro-compatible voice and music functions Audio controller . . . . . . . . . . . ESS 1688 Conversion . . . . . . . . . . . . . . . 16 bit (stereo analog-to-digital and digital-to-analog) FM music synthesizer . . . . . . . 20-voice, 72-operator Interfaces: Internal . . . . . . . . . . . . . . . ISA bus External . . . . . . . . . . . . . . . microphone (minijack); headphones/speaker (minijack) Internal speaker amplifier . . . . 0.5 W stereo Controls . . . . . . . . . . . . . . . . . . volume can be controlled through key combina- tions and software application menus Table 1-2. Technical Specifications (Continued)
1-10 Dell Latitude LM Systems Service Manual Video Video type. . . . . . . . . . . . . . . . 64-bit (128-bit hardware accelerated) PCI Video controller . . . . . . . . . . . NeoMagic 2070 Video memory . . . . . . . . . . . . 896 KB Active-Matrix Display Type . . . . . . . . . . . . . . . . . . . . active-matrix color (TFT) Dimensions: Height . . . . . . . . . . . . . . . 184.5 mm (7.3 inches) Width . . . . . . . . . . . . . . . . 246.0 mm (9.7 inches) Diagonal . . . . . . . . . . . . . . 307.5 mm (12.1 inches) Maximum resolution . . . . . . . 800 x 600 pixels; 256 colors Refresh rate (typical) . . . . . . . 70 Hz Response time (typical) . . . . . 60 ms Operating angle . . . . . . . . . . . 0° (closed) to 135° Dot pitch . . . . . . . . . . . . . . . . . 0.31 mm Power consumption . . . . . . . . 2.35 W Controls . . . . . . . . . . . . . . . . . brightness can be controlled through key combinations Dual-Scan Display Type . . . . . . . . . . . . . . . . . . . . dual-scan color (STN) Dimensions: Height . . . . . . . . . . . . . . . 172.8 mm (6.8 inches) Width . . . . . . . . . . . . . . . . 230.4 mm (9.1 inches) Diagonal . . . . . . . . . . . . . . 287.0 mm (11.3 inches) Maximum resolution . . . . . . . 800 x 600 pixels; 256 colors Refresh rate (typical) . . . . . . . 70 Hz Response time (typical) . . . . . 300 ms Operating angle . . . . . . . . . . . 0° (closed) to 135° Table 1-2. Technical Specifications (Continued)