Acer Aspire 1400 Service Guide

Chapter 125
Hardware Specifications and Configurations
Processor
ItemSpecification
CPU type Intel Desktop P4 up to 1.7GHZ or Northwood upgradable
CPU package  MPGA478 package CPU
CPU core voltage 1.75V/1.5V
BIOS
ItemSpecification
BIOS vendor Phoenix
BIOS Version 1.0
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,  PS/2 keyboard and mouse, USB, VESA 
VGA BIOS, CD-ROM bootable,...

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 2Total Memory
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
LAN Interface
ItemSpecification
Supports LAN protocol 10/100 Mbps
LAN connector type RJ45
LAN connector location Rear side
Modem Interface
ItemSpecification
Data modem data baud rate...

Chapter 127
Spindle speed 
(RPM)4200 RPM 4200 RPM 4200RPM 4200RPM 4200RPM 4200RPM
Performance Specifications
Buffer size  2048KB 512KB 2048KB 2048KB 2048KB 2048KB
Interface ATA-5 ATA-5 ATA-5 ATA-5 ATA-5 ATA-5
Max. media 
transfer rate 
(disk-buffer, 
Mbytes/s)216 235 287 216 235 287
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-5100 MB/Sec.
Ultra DMA 
mode-5100 MB/Sec.
Ultra DMA 
mode-5
DC...

28Chapter 1
 
   
  
Audio Interface
ItemSpecification
Audio Controller CS 4299
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 / Quantity Yes
Supports PnP DMA channel DMA channel 0
DMA channel 1
Supports PnP IRQ IRQ3,...

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 and 3
Optional parallel port I/O address (in BIOS 
Setup)3BCh, 278h, 378h
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...

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 to21V input voltage.
2. Birghtness adjustment...

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: 
     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
Electrical Characteristics
No
.ParameterSymbolMin.Ty p .Max.UnitConditions
1 Input...

32Chapter 1
*2. Inverter operating frequency should be within specification (51-59kHz) at max. and min. 
brightness load.
*3. INV_PWM enable implies INV_PWM signal is High level (On duty cycle is 100%). It it a square 
wave of 150Hz to adjust backlight brightness that is a function of PWM duty cycle. Backlight 
brightness is maximum value under INV_PWM at 100% and brightness is minimum under 
INV_PWM at 40%.
*4.The system interface signals belong to 3.3V.
*5. Please make sure open lamp output voltage...

Chapter 133
Supports colors 262K 262K 262K 262K 262K
Optical Specification
Brightness control keyboard 
hotkeykeyboard 
hotkeykeyboard 
hotkeykeyboard 
hotkeykeyboard 
hotkey
Contrast control No No No No No
Suspend/Standby 
controlYesYesYesYesYes
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-90FB RevF90W 3 PINS
Input Requirements
Maximum input current...

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.
S1 Sleeping State CPU Stop Clock
VGA Standby, turn off back-light
PCMCIA Standby
Hard Disk Spin Down motor
CD-ROM Spin Down
Super I/O Power down
S3 Sleeping State CPU set power down
VGA Suspend
PCMCIA...