Acer Extensa 390 Service Guide

System Introduction1-29 The following processes are the basic methods used to implement the LCD brightness AutoDim.
1. If the original brightness is over 75% and the AC power is on-line, the BIOS will change the
brightness to 75% after the AC power is off-line.
2. If the original brightness is below 75%, the brightness maintains the same level even if the AC
power is off-line.
3. If the brightness is already changed by the hotkey under DC power, it will not be changed after
the AC power is plugged in.
4....

1-30Service GuideTo re-install applications under Windows 95, click on Start, then Run….  Based on the location of
the application, run the setup program to install the application.  The following table lists the
applications and their locations:
Table 1-37Location of Applications in the System Utility CDNameFunctionLocationSleep Manager0V Suspend utilityENGLISH\WIN95\SLEEPMGR\Y-StationAudio applicationENGLISH\WIN95\YstationSafeOFFProtect if user accidentally press the power...

System Introduction1-31 1.6 Block Diagrams
1.6.1 SystemAUD BDConn.
Serial Port
CPU P55C
PCI BusPCI Bus
ISA BusISA BusCPU BusCPU Bus
Tag RamCache
 
DIMM2 Socket
ALIM1531
VGAC&T65555
ALIM1533
CD-ROM& HDDDConn.
AUD BDConn.
USBConn.Super I/O
SMC
FDC 37C672
BatteryConn.
ChargerConn.
BIOSROM
PCMCIA
TI 
PCI1250A
AUDIOYMF715
DIMM1 Socket
KBCM38813
SMB Bus
FIRcontrol
InternalFDD Conn.
AMPLM4836Figure 1-12System Block Diagram 

1-32Service Guide1.6.2 ClockCLK GEN
CY2272
SMB BUS
M1533
DIMM1
DIMM2
CPU CLK
M1531CACHECPU
SGRAM CLK
DIMM1DIMM2
PCI CLK14.318M48MHZ
1531153365555PCI1250
USB
153365555YMF71537C672MODEM
38813
72Figure 1-13Clock Block Diagram 

System Introduction1-33 1.7 Environmental Requirements
Table 1- 38Environmental RequirementsItemSpecificationTemperatureOperating (ºC)+5~ +35Non-operating(ºC)-20 ~ +60HumidityOperating (non-condensing)20% ~ 80%Non-operating (non-condensing)20% ~ 80%Operating Vibration (unpacked)Operating5 - 25.6Hz, 0.38mm;  25.6 - 250Hz, 0.5GSweep rate0.5 octave / minuteNumber of test cycles2 / axis (X,Y,Z)Non-operating Vibration (unpacked)Non-operating5 - 27.1Hz, 0.6G;  27.1 - 50Hz, 0.41mm; 50-500Hz, 2GSweep rate0.5...

1-34Service Guide1.8 Mechanical Specifications
Table 1-39Mechanical SpecificationsItemSpecificationWeight
  FDD model
  CD-ROM model(includes battery)
2.77 kg. (6.11 lb.)
2.8 kg.   (6.2 lb.)Dimensions
(main footprint)W x D x H
311.5mm x 236/246mm x 46.5mm  (12.26” x 9.29”/9.69” x 1.83”) 

C  h  a  p  t  e  r        2 C  h  a  p  t  e  r        2
Major Chips DescriptionMajor Chips Description2-1This chapter discusses the major chips used in the notebook.
Table 2-1Major Chips ListComponentVendorDescriptionPCI 1250ATIPC Card controller chipAladdin IV (M1531/M1533)ALiSystem Architecture chipsetFDC37C672SMCSuper I/O controller chip65555C&TVideo controller chipM38813Keyboard controller chipYMF715B-SYamahaAudio chip 

2-2Service Guide2.1 PCI 1250A
The Texas Instruments PCI1250A is a high-performance PC Card controller with a 32-bit PCI
interface. The device supports two independent PC Card sockets compliant with the 1995 PC Card
Standard. The PCI1250A provides a rich featured set which make it the best choice for bridging
between PCI and PC Cards in both notebook and desktop computers. The 1995 PC Card Standard
retains the 16-bit PC Card specification defined in PCMCIA Release 2.1, and defines the new
32-bit PC Card,...

Major Chips Description2-3 · Supports Burst Transfers to Maximize Data Throughput on both PCI Buses
· Supports Serialized IRQ with PCI Interrupts
· 8-Way Legacy IRQ Multiplexing
· System Interrupts can be Programmed as PCI-style or ISA IRQ-style
· ISA IRQ interrupts can be Serialized onto a single IRQSER pin
· EEPROM Interface for Loading Subsystem ID andSubsystem Vendor ID
· Pipelined Architecture allows Greater than 130 Mbytes per second throughput  from CardBus
to PCI and from PCI to CardBus
·...

2-4Service Guide2.1.2 Block Diagram
A simplified block diagram of the PCI1250 is provided in following figure. The PCI interface
includes all address/data and control signals for PCI protocol. The interrupt interface includes
terminals for parallel PCI, parallel ISA, and serialized PCI & ISA signaling. The ring indicate
terminal is included in the interrupt interface, since its function is to perform system wake-up on
incoming PC Card modem rings. Miscellaneous system interface terminals include GPIO...