Acer Travelmate 420 Service Guide
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Chapter 123 Hardware Specifications and Configurations Processor ItemSpecification CPU type Intel Pentium 4 CPU package / PGA478 package CPU core voltage Depend on CPU VID CPU I/O voltage 1.2V BIOS ItemSpecification BIOS vendor Phoenix BIOS Version PhoenixBIOS 4.0 Release 6.0 BIOS ROM type Flash ROM BIOS ROM size 512KB BIOS package TSOP Supported protocols ACPI 1.0b,PC Card 95, SM BIOS 2.3, EPP/IEEE 1284, ECP/IEEE 1284 1.7 & 1.9, PCI 2.2, PnP 1.0a, DMI 2.0, PS/2 keyboard and mouse, USB, VGA BIOS,...
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24Chapter 1 NOTE: Above table lists some system memory configur ations. You may combine DIMMs with various capacities to form other combinations. . Memory Combinations Slot 1Slot 2Total Memory 256/512MB 0 MB 256MB/512MB 256/512MB 128MB 384MB/640MB 256/512MB 256MB 512MB/768MB 256/512MB 512MB 768MB/1024MB LAN Interface ItemSpecification Supports LAN protocol 10/100 Mbps LAN connector type RJ45 LAN connector location Right side Modem Interface ItemSpecification Data modem data baud rate (bps) 56K...
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Chapter 125 DVD-ROM Interface ItemSpecification Vendor & model name Toshiba (SR-C2612) Performance Specification With CD Diskette With DVD Diskette Transfer rate (KB/sec) (Mode1) 4X-5.7X PCAV 600-855KByte/s 10.3X-24X CAV 1552-3600KByte/s (Mode2) 4X-5.7X PACV 684.4-975.3KBytes/s 10.3X-24X CAV 1769-4104KByte/s 3.3X-8X CAV 4463-10820KByte/s Data Buffer Capacity 192 KBytes Interface IDE/ATAPI Applicable disc format DVD: DV D-ROM (DVD-5, DVD-9, DVD-10, DVD-18),DVD-R (read, single border), DVD-RW(read)...
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26Chapter 1
Loading mechanism Load: Manual
Release: (a) Electrical Release (Release Button)
(b) Release by ATAPI command
(c) Emergency Release
Power Requirement
Input Voltage +5 V +/- 5 % (Operating) +/- 8 % (Start up
Vendor & model name Toshiba (SD2212)
Performance Specification With CD Diskette With DVD Diskette
Transfer rate (KB/sec) (Mode1) PCAV 600-900KByte/s
CAV 1552-3600KByte/s
(Mode2)
PACV 684.4-1026KBytes/s
CAV 1769-4104KByte/s CAV 2230-5480 Block/s
Data Buffer...
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Chapter 127
Transfer rate (KB/sec) Sustained:
Max 3.6Mbytes/sec Sustained:
Max 10.8Mbytes/sec
Data Buffer Capacity 2MBytes
Interface IDE/ATAPI
Applicable disc format DV D: DVD-Video, DVD-ROM, DVD-R (3.9GB, 4.7GB)
CD: CD-DA, CD-ROM, CD-RW, CD-R, CD-ROM XA, (except ADPCM) CD-I
Ready, PhotoCD (muiltiSession) Video CD, Cd-Extra (CD+), CD-text
Loading mechanism Load: Manual Release: (a) Electrical Release (Release Button)
(b) Release by ATAPI command
(c) Emergency Release...
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28Chapter 1 Connector type 25-pin D-type connector, in female type Parallel port function control Enable/Disable/Auto (BIOS or operating system chooses configuration) by BIOS Setup Note : Depending on your operating system, disabling an unused device may help free system re sources for other devices. 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...
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Chapter 129 There are two control signals that come form system to control lamp brightness. One signal is named DAC_BRIG, which limits curr ent to meet LCD lamp current specification. Another one is named PWM, which adjusts lamp br ightness. 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...
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30Chapter 1 Electrical Characteristics No .ParameterSymbolMin.Ty p .Max.UnitComment 1 Input voltage NV_PWR 9 14.8 21 V 7.5V (continuous) can work *Note 1 2 Input current Iin -- 0.33 -- A 3 Lamp current IL 3.0 -- 6.8 mA DAC=0V *Note 2 4 Lamp current IL 2.7 -- 6.3 mA DAC=1V 4 Frequency F45 5565 KHz * Note 3 5 Output power Pout -- -- 4.5 W 6 Efficiency η80% -- -- -- 7 Starting voltage Vs 1600 -- --- V At 0’C 8 Starting time Tvs 1 -- 1.5 Sec 9 Dispoff# 2.8 3.3 3.6 V Backlight on/off signal 0 0.5 0.8...
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Chapter 131
NOTE:
*1. The inverter can work in 7.5V input voltage (continuous), but 7.5V electronic characteristic will
not be care.
*2. Limited lamp maximum current by DAC_BRIC signal:
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.
When add 1V DAC, the 100% Lamp current will decrease 0.5mA.
DAC_BRIG signal comes from system chipset with internal resistance of 3K
*3....
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32Chapter 1 All components on inverter board should follow below rules: 1. Component using conditions (component stress) must be within compone nt specification including voltage rating, current rati ng, temperature etc. 2. Component temperature should follow below: T∆ T