Acer Travelmate 270 Service Guide
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26Chapter 1 NOTE: Above table lists some system memory configurations. You may combine DIMMs with various capacities to form other combinations. . Memory Combinations Slot 1Slot 2To t a l M e m o r y 128MB/256 MB 0 MB 128MB/256 MB 128MB/256 MB 128 MB 256MB/384 MB 128MB256 MB 256 MB 384MB/512 MB 128MB/256 MB 512 MB 640MB/768 MB 512MB 512MB 1024MB LAN Interface ItemSpecification Supports LAN protocol 10/100 Mbps LAN connector type RJ45 LAN connector location Right side Modem Interface...
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Chapter 127 Spindle speed (RPM)4200 RPM4200 RPM4200 RPM4200 RPM4200 RPM4200 RPM4200 RPM4200 RPM4200 RPM Performance Specifications Buffer size 2048KB 2048KB 2048KB 2048KB Interface ATA-5 ATA-5 ATA-5 ATA-5 Max. media transfer rate (disk-buffer, Mbytes/s)216 287 287 235 Data transfer rate (host~buffer, Mbytes/s)100 MB/ Sec. Ultra DMA mode-5100 MB/ Sec. Ultra DMA mode-5100 MB/ Sec. Ultra DMA mode-5100 MB/ Sec. Ultra DMA mode-5 DC Power Requirements Voltage tolerance5V(DC) +/-...
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28Chapter 1 Audio Interface ItemSpecification Audio Controller Integrated Software Audio in SiS961 South Bridge with Realtek ALC202 AC97 Codec(No SPDIF) Audio onboard or optional Built-in Mono or Stereo Stereo Resolution 20 bit stereo Digital to analog converter 18 bit stereo Analog to Ditial converter Compatibility Microsoft PC98/PC99, AC97 2.1 Mixed sound source Line-in, CD, Video, AUX Voice channel 8/16-bit, mono/stereo Sampling rate 44.1 KHz Internal microphone No Internal speaker /...
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Chapter 129 Supports ECP/EPP/Bi-directional (PS/2 compatible) Yes (set by BIOS setup) Note: When Mode is selected as EPP mode, “3BCh” will not be available. Optional ECP DMA channel (in BIOS Setup) DMA channel 1 Optional parallel port I/O address (in BIOS Setup)378h, 278h, 3BCH Optional parallel port IRQ (in BIOS Setup) IRQ7, IRQ5 USB Port ItemSpecification USB Compliancy Level 1.1 OHCI USB 1.1 Number of USB port 3 Location Rear side Serial port function control Enable/Disable by BIOS Setup...
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30Chapter 1 There are two control signals that come form system to control lamp brightness. One signal is named DAC_BRIG, which limits current to meet LCD lamp current specification. Another one is named PWM, which adjusts lamp brightness. This inverter brightness is adjusted by PWM burst mode. The PWM burst mode is that turning on and off the lamp at rate of 150Hz. The effective brightness is a function of the duty cycle. Features 1. Wide range 9V to 21V input voltage. 2. Birghtness adjustment...
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Chapter 131 3. Automatic brightness compensation for input voltage variation. NOTE: Please pay attention to the fellowing: *1. Limited lamp maximum current by DAC_BRIC signal: Electrical Characteristics No .ParameterSymbolMin.Ty p .Max.UnitComment 1 Input voltageNV_PWR 9 14.8 21 V 2 Input currentIin -- 0.33 -- A 3 Lamp currentIL 2.7 -- 6.3 mA *Note 1 4 FrequencyF45 5565 KHz* Note 2 5 Output powerPout -- -- 4.5 W 6 Efficiencyη80% -- -- -- 7Starting voltageVs 1600 -- --- V At 0’C 8Starting...
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32Chapter 1
When DAC_BRIG voltage is 0V and INV_PWM enables (100%), lamp has max. current.
When DAC_BRIG voltage is 3.3V and INV_PWM enables (100%), lamp has min. current.
DAC_BRIG signal comes from system chipset with internal resistance of 3K
*2. Inverter operating frequency should be within specification (45~65kHz) at max. and min.
brightness load.
*3. INV_PWM enable implies INV_PWM signal is High level (On duty cycle is 100%). It is a square
wave of 150Hz to adjust backlight brightness...
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Chapter 133 Supports colors 262K 262K 262K 262K 262K Optical Specification Brightness control keyboard hotkeykeyboard hotkeykeyboard hotkeykeyboard hotkeykeyboard hotkey Contrast controlNoNoNoNoNo Suspend/Standby controlYe s Ye s Ye s Ye s Ye s Electrical Specification Supply voltage for LCD display (V)3.3 3.3 3.3 3.3 3.3 Supply voltage for LCD backlight (Vrms)690 690 690 690 690 AC Adapter ItemSpecification Vendor & model name ADAPTER ADP-65DB BG65W 3 PINS Input Requirements Maximum input...
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34Chapter 1 ACPI modePower Management Mech. Off (G3) All devices in the system are turned off completely. Soft Off (G2/S5) OS initiated shutdown. All devices in the system are turned off completely. Working (G0/S0) Individual devices such as the CPU and hard disk may be power managed in this state. Standby (S1) CPU in Stop Clock state VGA Standby, turn off back-light PCMCIA Standby Audio Power Down Hard Disk Spin Down motor Super I/O Power down Suspend to RAM (S3) CPU set power down VGA Suspend PCMCIA...
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Chapter 135 Switch Power switch Lid switch Internet switch Wireless ON/OFF switch E-mail switch Memory Address Map Memory AddressSizeFunction 00100000h-000F0000h 64KB System BIOS 000CD000h-000C0000h VGA BIOS 000C0000h-000A0000h 128 KB Video memory (VRAM) 000A0000h-00000000h 640KB Conventional memory I/O Address Map I/O AddressFunction 000-00F DMA controller-1 020-021 Interrupt controller-1 040-043 Timer 1 060, 064 Keyboard controller 38859 chip select 061 System speaker out 040B DMA controller-1 061...