Acer Extensa 660 Maintenance Manual
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Operating Instructions 3-9 3.7.1 Lowering Inactivity Timeouts Inactivity timeouts turn off devices in the computer when you are not using them. Lowering the inactivity timeouts shortens the period of time the computer waits before turning off the device. 3.7.2 Suspending Operation While Idle Although the computer goes into Suspend mode automatically after a defined period of inactivity, you can reduce energy consumption even further by pressing either Fn+F3 (Suspend) or Fn+F4 (Standby) as soon as you no longer need the computer to be active. ¨Pressing Fn+F4 (Standby) turns off the screen. ¨Pressing Fn+F3 (Suspend) turns off the screen, stops the hard disk, and reduces energy usage to the lowest level possible without turning off the computer. ¨Pressing the Shift key resumes activity after the notebook has been in either the Suspend or Standby modes. 3.7.3 Responding to a Low Battery Condition When you are operating the computer on battery power and the charge remaining is down to between 10% and 20%, the battery-low indicator blinks and an audible alarm sounds. When this happens you should take the following actions to conserve battery power and reduce the possibility of data loss. ¨Saving files — Save all open files frequently while the computer is in a low- battery condition. ¨Turning off the alarm — Turn off the audible alarm by pressing Fn+End (Mute). ¨Reducing screen brightness — Reduce screen brightness by pressing Fn+¯. ¨Connecting the AC adapter — If you have access to AC power, connect the computer to the AC adapter. You can do this without turning off the computer. ¨Suspending operations — Press Fn+F3 or Fn+F4 to put the computer into Suspend or Standby mode whenever you are not actively using the computer. Press the Shift key to bring the computer out of Suspend or Standby mode.
3-10 Operating Instructions 3.7.4 Replacing the battery If you have a spare, charged battery, you can do one of the following. ¨Insert a secondary battery into the modular bay. ¨If you already have a battery in the modular bay, you can replace the primary battery without turning off the computer. ¨If you cannot insert the spare battery into the modular bay, suspend operations to disk by pressing Fn+F2 and replace the battery. When you turn on the computer, the computer returns to the saved state. 3.7.5 Saving to Disk When the battery power becomes critically low (less than 5% charge remaining), the computer saves the current state of the computer to disk and turns off. When you turn the computer on again, the computer restores the state that was saved to disk.
Theory of Operation 4-1 4 Theory of Operation 4.1 Introduction This section contains a general block diagram theory of operation description of the Extensa 660 Series Notebook Computers. Note: Various internal components may change on future models and busses/bus speeds are subject to change. 4.2 Notebook Functional Overview The Extensa 660 Series Notebooks consist of eight major functions or sections including: ¨System Processor — implemented on the System Board Assembly ¨Memory Subsystem — implemented on the System Board Assembly ¨I/O Subsystem — implemented on the I/O Board ¨Keyboard Subsystem — implemented on the System Board Assembly and the Keyboard Assemblies ¨Video Subsystem — implemented on the I/O Board, LED Board, and LCD Display Panel ¨Sound Subsystem — implemented on the System Board Assembly. ¨Glidepad Mouse Subsystem — implemented on the Glidepad assembly and on the System Board Assembly ¨Hard Disk Drive Subsystem — implemented on the System Board Assembly and the Hard Disk Drive Assembly ¨Floppy Disk Drive Subsystem — implemented on the System Board and Floppy Disk Drive Assembly ¨PCMCIA Controller and Sockets — implemented on the System Board ¨CD-ROM Subsystem — implemented on the System Board and the CD-ROM ¨Power Subsystem — implemented on the Power Supply Board, Inverter Board, battery packs, and AC adapter
4-2 Theory of Operation Figure 4-1 Extensa Functional Block Diagram Bank 1 8, 16MB (DIMM) PentiumP55CLM-166MHz CORE CHIPUMC UM8891BF-N, UM8892BF-N, UM8886BF-N VGA CHIP C&T 65548 CRT ONLCMINVERTER FLASH BIOS 256KB PCMCIAOMEGA 82C094 KB CONTROLLER MITSUBISHI M38813M4 SUPER I/O NS PC87336VLJ GLIDE PAD EXT. KB/MOUSE INTERNAL KB CARD 1 CARD 0 FDD HDD PRINTER CLOCK GEN ICS AV9154-43 ACADAPTERDC/DCCONVERTER 14.318MHz 24MHz 66MHz 14.318MHz XTAL BATTERY IN +3.45V +5V +12V DC-IN COM1 CD-ROM (8X, 10X) AC Input 1MB VIDEO RAM
Theory of Operation 4-3 4.2.1 System Processor The System Processor function for the notebook is implemented on the System Board in the form of an Intel Pentium P55CLM 166 MHz Super scalar 586 Processor Chip. The processor operates in conjunction with RAM and ROM Memory and other control logic to process software instructions (BIOS, DOS, Windows, and applications). The processor communicates with the hard disk drive and the memory components using high speed busses. The Processor also interacts with other hardware logic to provide the power savings features for the notebook. These features include controlling CPU clock speeds, reducing clock speeds whenever possible, e.g., when performing floppy disk drive accesses, powering down unused devices, etc. 4.2.2 Memory Subsystem The memory subsystem comprises the following components: ¨Main memory ¨L2 Secondary Memory (cache) ¨Flash ROM The Extensa Series uses fast Extended Data Out (EDO) DRAM for main and video memory and high-speed synchronous, pipelined burst SRAM for L2 cache memory. Main BIOS and Video BIOS are stored in Flash ROM. 4.2.2.1 Main Memory The standard 660 Series notebook comes with 16 MB of Main memory installed on the System Board. Memory expansion accommodations are provided via a standard soDIMM connector on the bottom of the System Board Assembly. By installing a 64 MB soDIMM module, the basic memory size can be expanded to a maximum of 80 MB. 4.2.2.2 Flash ROM All versions of the Extensa notebook family use a Flash ROM that contains both the main system BIOS and the VGA BIOS. The Flash ROM contains Boot Block logic that allows downloading new versions of BIOS without destroying the Boot Load area. The Flash ROM execution RAM is 8 bits wide. However, better performance is attained by enabling the Shadow. With this feature enabled, BIOS is copied into a 32-bit, high- speed system. 4.2.3 System Controller Function The system controller function is implemented on the System Board via a UMC 8890 Series Notebook Chipset. The UM8890 is an advanced 586 compatible single chip that integrates such functions as the PMU, System Controller, R TC and Peripheral
4-4 Theory of Operation Controller (206) into a single 208 QFP package. Major features of the System Logic Controller include: ¨System: — Fully compatible with IBM PC/AT — Supports PCI Bus-Master mode — System Operation Voltage from 3V to 5.5V — Three programmable non cacheable regions — Flash ROM Boot block erase protection — Supports general purpose I/O — Hybrid Voltage ¨Integration: — Built-in 206 — Built-in 146818A — Built-in Memory Controller ¨Memory Controller: — Supports ROM DOS up to 64 MB by XIP, 16 MB by EMS — Supports Shadow RAM from C0000-FFFFF — Supports SLOW and SELF Refresh DRAM — Supports Stagger Refresh — On-board memory up to 48 MB — Supports Three Memory Banks — Supports Page Mode/Burst mode operation — Supports 512 KB x 8, 1M x 4, 1M x 16, 2M x 8 and 4M x 4 type DRAM — Supports 8- or 16-bit ROM configuration — Programmable DRAM timing for each bank ¨Power Management: — Supports up to Ten Programmable PMC Outputs — Supports Multiple Power Saving Mode — Full On Mode
Theory of Operation 4-5 — On Mode — Doze Mode — Sleep Mode — Suspend Mode — Auto Power Reduction Mode (APR) — Word Processing Mode (WP) — All Register Read/Writeable for 0V Suspend — Microsoft APM Compatible — Supports 0V Suspend — Demand Driven Clock Control — Supports Resume/Suspend Key — Auto Wake-Up Function — Three Low Battery Monitor Input — System Operating Voltage from 3V to 5.5V — Low Power Consumption (at 3.3V) — 50mA at Full On Mode — 25mA at Doze Mode —100mA at SUSPEND Mode —15mA at POWER-OFF Mode with R TC active 4.2.4 Video Subsystem The video subsystem is implemented on the VGA Video Board and on the System Board Assemblies. The notebook contains a built-in 10.4-inch (or larger) LCD and features simultaneous LCD and external VGA display. The video subsystem includes a 1.5 MB DRAM memory, 32-bit DRAM bus, and separate display and memory clocks. An additional frame buffer/accelerator DRAM increases the available memory band width for CPU accesses. The video section also uses additional levels of write FIFOs, a read cache, page mode DRAM. 4.2.5 Sound Subsystem The Extensa Series Notebook is equipped with a sound chip set that is Sound BlasterTM and Sound Blaster Pro compatible. Internal stereo speakers provide the Notebook with sound generation capabilities. A set of 3.5 mm connectors allow for
4-6 Theory of Operation external microphone and line inputs and headphone/speaker outputs. The sound subsystem also includes a variety of sound utilities that combine to provide additional multi-media functions: 4.2.6 Keyboard Subsystem The keyboard subsystem, implemented on the Keyboard Assembly and the System Board Assemblies Board, consists of the following major sections: ¨Keyboard Assembly ¨Keyboard Scanner ¨Status LED Interface 4.2.7 Hard Disk Drive Subsystem The Hard Disk Drive Subsystem, implemented on the System Board and on the associated hard disk drive module(s), provides disk storage for all system software and user files. The notebook is equipped with a high-capacity hard disk drive. The hard disk drive also features built-in power conservation features configured from the standard CMOS Setup Routine. An Automatic Power Down mode can be selected which powers down the drive motor during periods of inactivity. An additional level of power conservation may also be selected which powers down the motor plus all control circuits. The hard disk drives are factory formatted as a single drive (Drive C:) and are preloaded with installation versions of Windows 95 or Windows for Workgroups (in dual load versions, the user selects the operating system during software installation). 4.2.7.1 Hard Disk Drive Power Management Both the internal hard disk drive and the hard disk drive installed in the media bay implement power savings features. From the CMOS setup routine, an automatic power down mode can be selected which enables the drive to turn off its motor after a specified period of inactivity. Additional Sleep modes can direct additional power savings during inactive periods by powering down the control circuitry. 4.2.8 Floppy Disk Drive Subsystem The Extensa 660 is equipped with a 3.5-inch floppy disk drive in the media bay that can read/write standard 3.5-inch disks (either1.44 MB or 2 MB capacity). The drive can also read a 720 KB disk (for interchange of data with other computers). The data transfer rate for the floppy disk drive is 500 Kbits per second for high- density disks and 250 Kbits per second for double-density disks.
Theory of Operation 4-7 4.2.9 Power Subsystem The notebook is equipped with a software/hardware monitored/controlled Power Subsystem that minimizes battery usage for prolonged battery operation and automatically recharges the batteries when the notebook is used with an AC adapter. 4.2.9.1 AC Power Adapter The computer is equipped with a universal AC power adapter that converts AC voltage into DC voltage (approx. 46 Watts of power) used to operate the notebook and charge the batteries. The specifications for the AC adapter include: ¨Input Voltage: 100 to 250 VAC ¨Input Current: Approximately 1.5 Amps ¨Input Frequency: 50 to 60 Hz