Acer Travelmate 7300 Service Guide

							2-74Service Guide
2.9  Ambit DC-AC Inverter
This notebook uses two kinds of DC-AC inverters: One (T62.088.C) is designed for the 13.3-inch
TFT (LG LP133X1) LCD, the other (T62.055.C) for the 12.1-inch TFT (IBM ITSV50D) LCD.
2.9.1 T62.055C
2.9.1.1 Pin Diagram
CN2CN1T62.055.C
1
221
20
3
2
1CN3
Figure 2-12 T62.055.C Pin Diagram
2.9.1.2 Pin Descriptions
Table 2-9 T62.055.C Pin Descriptions
Pin NamePin TypePin No.Descriptions
CN1 connector signals
Vhi
VloO1
2This is the High voltage side of the Lamp. (The shorter wire to
lamp connects to this output.
Max lamp start voltage(Vrms): 1300
Typical lamp run voltage @25
°C(Vrms): 650
Min open circuit voltage (Vrms): 1100
Max open circuit voltage(Vrms): 1500
CN2 connector signals
GND GND 1, 6 This the return signal for the input power and control signals and
is an extension of the system ground.
CNTADJ O 2, 9 Contrast adjustment (reserved)
DCIN I 3, 4, 5 This is the input DC voltage to supply the operating power.
Max value: 19VDC
Min value: 7 VDC
BRTADJ O 7 This is an analog signal in the range of 0 to 3 volts to control the
lamp current.
Vbrite = 1 volt, Lamp current = 50%
±10% of Max.
Vbrite = 3volts, Lamp current = Max = 4.5mA
PANEL_ON I 8 A control pin to control on/off lamp.  This input enable the inverter
operation (Lamp On) when high and disables the inverter when
low. This signal is output from a 3.3V CMOS device.
Max loading = 100uA
Logic Low = 0.8 volts Max.
Logic High =1.8 volts Min.
PWRLED O 12 This signal is an open collector sink signal to drive LED1. The
LED current is limited by a series resistor of 1K
W. 
						

							Major Chips Description 2-75
Table 2-9 T62.055.C Pin Descriptions
Pin NamePin TypePin No.Descriptions
BATTLED O 13 This signal is an open collector sink signal to drive LED2. The
LED current is limited by a series resistor of 1KW.
BMCVCC O 14 This a 5 volt supply for powering the LEDs. It should not be used
for any other purpose.
ADVDD O 18 This is a 5 volt power line for the analog circuits and display LEDs
on the inverter board.
AUDGND GND 19, 20 This is the return ground for the microphone circuit. It should not
be connected to VGND or other circuit on the inverter board.
MIC_OUT O 21 This is the output of the microphone preamplifier circuit.
N.C. - 10, 11,
15, 16,
17Non-connected.
CN3 connector signals
MIC-CON I 1 Microphone input
N.C. - 2 Non-connected.
AUDGND GND 3 This is the return ground for the microphone circuit. It should not
be connected to VGND or other circuit on the inverter board.
2.9.2 T62.088C
2.9.2.1 Pin Diagram
Figure 2-13 T62.088.C Pin Diagram
2.9.2.2 Pin Descriptions
Table 2-10 T62.088.C Pin Descriptions
Pin NamePin TypePin No.Descriptions
CN1 connector signals
VOUT1 O 1 Lamp, HV
NC 2
VOUT2 O 3 Lamp, LV
CN2 connector signals 
						

							2-76Service Guide
Table 2-10 T62.088.C Pin Descriptions
Pin NamePin TypePin No.Descriptions
ADVDD I 1 This is a 5-volt power line for the analog circuits and display
LEDs on the inverter board.
MIC_OUT O 2 Microphone preamplifier circuit output
AUDGND I/O 3 Microphone circuit return ground
GND I/O 4, 5 System ground
SGND I/O 6 Signal ground
CNTADJ 7 NC
BRTADJ I 8 Lamp current control pin (0~3V)
PANEL_ON I 9 On/Off (On:1.8V(min), Off:0.8V(max))
BMCVCC I 10 This is a 5-volt for powering the LEDs.
PWRLED I/O 11 Connect to D5 LED
BATTLED I/O 12 Connect to D6 LED
DCIN I 13, 14, 15 DC (7~19V)
CN3 connector signals
MIC_IN I 1 Microphone circuit input
NC 2
AUDGND I/O 3 Microphone circuit ground 
						

							&KDSWHU &KDSWHU
BIOS Setup Information
BIOS Setup Information 3-1
The computer BIOS setup utility allows you to configure the computer and its hardware settings. The
computer comes correctly configured, and you do not need to run the BIOS setup utility to use the
computer. However, you might need to use the BIOS utility if you want to customize the way your
computer works, or if you receive an error message after making hardware or software changes.
With the BIOS setup utility, you can:
· Check the system configuration
· Change the system date, time, or speed
· Add or change the location of the external mouse
· Change the system startup sequence
· Set the power-saving suspend mode
· Set or change resume options
· Set, change, or remove a system password
Press Fn+F2 to access the BIOS setup utility. You will see the BIOS Utility main screen shown
below.
BIOS Utility
About My Computer
System Configuration
Power Saving Options
System Security
Reset to Default Settings
­¯ = Move Highlight Bar, 
¿ = Select, Esc = Exit
Press 
­ or 
¯ to highlight the menu item you want. Then press Enter to access the highlighted item.
Press Esc to exit. 
						

							3-2Service Guide
3.1  About My Computer
Selecting About My Computer presents you with two screens of details about the computer and its
peripherals. These screens are for information only; you cannot change the settings on these
screens.  The following table tells you what each of the items on the About My Computer screens
are.
Table 1-1 About My Computer Parameters
ItemDescription
System Architecture System architecture information
System BIOS BIOS version
System ID ID information on major components
Processor Processor type and speed
Coprocessor Coprocessor type
Internal Cache (L1) Internal cache size and whether it is enabled or not
External Cache (L2) External cache size and whether it is enabled or not
Total Memory Total memory size
Bank A Bank A memory module size, type and speed
Bank B Bank B memory module size, type and speed
System Peripherals
Graphics Controller Graphics controller type and video memory size
Display Output Display type and resolution
Hard Drive 0 IDE 0 drive type and size (hard disk)
Hard Drive 1 IDE 1 drive type (CD-ROM or other IDE drives)
Floppy Drive A Floppy drive A type
Floppy Drive B Floppy drive B type
Expansion Peripherals
PCMCIA Slot 0 Card presence in slot 0 (detected by the socket service)
PCMCIA Slot 1 Card presence in slot 1 (detected by the socket service)
Parallel Port Parallel port base address and IRQ
Serial Port Serial port base address and IRQ
IrDA (FIR) Infrared port base address and IRQ
Onboard USB USB port if enabled or not
AC Adapter Connected AC adapter information
Main Battery Installed battery type information
Onboard Audio
Base Address Audio base address
MPU Base Address Audio MPU-401 base address
IRQ Setting Audio IRQ settings
DMA Channel Audio DMA channels 
						

							BIOS Setup Information 3-3
3.2 System Configuration
Selecting System Configuration presents a Basic System Configuration screen, where you can
change several items in your computer’s configuration.
Press ­ or ¯ to move from one item to another, and ¬ or ® to change settings. Press F1 to get help
on a selected item. Press Esc to exit the Basic System Configuration screen and return to the main
BIOS Utility screen.
3.2.1  Date and Time
The current date is in “Day-of-the-week Month Day, Year” format—for example, [Mon Aug 11, 1997].
The current time is in “Hour:Minutes:Seconds” format. The system uses a 24-hour clock—for
example, 6:25:50 PM appears as 18:25:50.
3.2.2 Floppy Drives
The default setting for Floppy Drive A is 1.44 MB 3.5-inch. Floppy Drive B is set to None, and it is
only enabled if you connect an additional external floppy drive.
3.2.3 Hard Disks
The Hard Disk 0 entry refers to the computer’s internal hard disk. W ith this entry set to Auto, the
BIOS automatically detects the hard disk and displays its capacity, cylinders, heads, and sectors.
Other hard disk settings are configured automatically for optimum drive performance.
You can change the Hard Disk 0 entry to User if you want to enter drive settings manually. To
determine your drive settings, check the data found on your hard disk or supplied in the hard disk
vendor documentation.
Caution:  We suggest that you leave this parameter set to
Auto to allow the BIOS to auto-detect the drive settings at
each boot-up.
The Hard Disk 1 entry is used when a CD-ROM drive module or second IDE drive option is installed
in the module bay.
3.2.4  Num Lock After Boot
W hen set to Enabled, Num Lock After Boot tells the computer to turn on Num Lock automatically on
startup, activating the keyboard’s embedded numeric keypad. The default setting is Enabled.
3.2.5  LCD Expansion Mode
W hen set to Enabled, LCD Expansion Mode allows full-screen views in DOS mode. The default
setting is Disabled. 
						

							3-4Service Guide
3.2.6 Internal Speaker
This parameter lets you enable or disable the internal speaker. The default setting is Enabled.
Tip:  You can also toggle the speaker on and off by pressing
the speaker hot key combination Fn+F7.
3.2.7 Silent Boot
W hen set to Enabled, the computer shows the computer logo onscreen and hides the POST routine
messages.  The default setting is Enabled.
3.2.8 Fast Boot
W hen set to Enabled, the computer bypasses the memory tests to speed up the boot-up process.
The default setting is Disabled. 
						

							BIOS Setup Information 3-5
3.3  Advanced System Configuration
For advanced users, the System Configuration menu item contains two hidden pages that allow you
to view and configure more technical aspects of the computer.
Caution:  The computer is already tuned for optimum
performance and you should not need to access these
advanced screens. If you do not fully understand the items in
these special screens, do not change their values.
To access the Advanced System Configuration screens, press F8 at the BIOS Utility main screen
before selecting the System Configuration menu item. W hen you now select System Configuration
and the Basic System Configuration screen appears, you will see “Page 1/3” in its upper right
corner. Press PgDn to access page 2, the first Advanced System Configuration screen, and PgDn
again to access page3, the second Advanced System Configuration screen.
Note:  F8 acts as a toggle on the BIOS Utility main screen.
Each time you press F8 at the main screen, you toggle
between accessing the single-screen Basic System
Configuration and the three-screen Advanced System
Configuration.
3.3.1 Internal Cache
Internal cache refers to cache built into the CPU. W hen enabled, this setting boosts system
performance. It is also called CPU cache or L1 (level one) cache. The default setting is Enabled.
3.3.2 External Cache
External cache greatly increases system performance by lessening the load on main memory. It is
also called L2 (level 2) cache. The default setting is Enabled.
3.3.3  Enhanced IDE Features
The Enhanced IDE Features section includes four parameters for optimizing hard disk performance.
These performance features depend on drive support. Newer drives support most or all of these
features.
· Hard Disk Size > 504MB.
 If your hard disk size is greater than 504MB and you use DOS or
Windows, set this parameter to DOS/Windows3.x/Win95. If you use NetWare, UNIX, or
Windows NT, set this parameter to Others. The default setting is DOS/Windows3.x/Win95.
· Multiple Sectors Read/Write. This parameter enhances hard disk performance by
reading/writing more data at once. The available values are: Auto or Disabled.
 The default
Auto setting allows the system to adjust itself to the optimum read/write setting.
· Advanced PIO Mode.
 Advanced PIO (Programmed Input/Output) Mode enhances drive
performance by optimizing the hard disk timing. The available values are: Auto and Mode 0.
The default setting is Auto. 
						

							3-6Service Guide
· Hard Disk 32 Bit Access. This parameter allows your hard disk to use 32-bit access. The
available values are: Auto and Disabled. The default setting is Auto.
Tip:  We suggest you set all of these parameters to Auto
whenever that choice is available. This allows the computer to
use the hard drive at the highest possible performance level.
3.3.4  Onboard Communication Ports
The Onboard Communication Ports section allows you to set addresses and interrupts for the
computer’s serial and parallel ports.
· Serial Port. The Serial Port parameter can be set to Enabled or Disabled.  The Base Address
parameter accepts the following values: 3F8h, 2F8h, 3E8h or 2E8h.  The IRQ parameter
accepts 4 or 3.
The default values are Enabled, 3F8h and 4.
· IrDA (FIR). The IrDA (FIR) parameter can be set to Enabled or Disabled.  The Base Address
parameter accepts the following values: 3F8h, 2F8h, 3E8h or 2E8h.  The IRQ parameter
accepts 4 or 3.  The DMA Channel parameter accepts 3, 0 or 1.
The default values are Enabled, 2F8h, 3 and 3.
· Parallel Port. The Parallel Port parameter can be set to Enabled or Disabled.  The Base
Address parameter accepts 378h or 278h.  The IRQ parameter accepts 7 or 5.  The Operation
Mode parameter accepts the following values:  EPP, ECP, Bi-directional or Standard.  The ECP
DMA Channel parameter lets you set the DMA channel used in ECP mode. You must choose
DMA channel 1 or 3 with this parameter if you select ECP as your parallel port operation mode.
The default values are Enabled, 378h, 7 and EPP.
Caution:  In order to prevent resource conflicts, the BIOS
Utility does not allow you to set the same IRQ and address
values for different devices.
3.3.5 Onboard USB
W hen enabled, you can connect USB devices to the onboard USB port on the rear of the computer.
The default setting is Enabled.
3.3.6  Reset PnP Resources
The system resources are already properly configured. If resource conflicts arise, you can set this
parameter to Yes to reset and reallocate PnP resources, after which the BIOS automatically resets
this parameter to No, which is the default setting. 
						

							BIOS Setup Information 3-7
3.4  Power Saving Options
Selecting Power Saving Options on the BIOS Utility main screen presents a screen that allows you
to adjust several power-saving settings.
3.4.1  When Lid is Closed
The computer’s lid switch acts as its power switch: opening the display wakes up the computer,
closing the display puts it to sleep. The W hen Lid is Closed setting determines which suspend mode
the computer enters when the display is closed: Suspend to Disk or Suspend to Memory. The
default is Suspend to Disk.
· Suspend to Disk. 
With this setting, the computer saves all data to the hard disk when you
close the display. The computer wakes up when you reopen the display.
· Suspend to Memory. 
With this setting, the computer saves all data to memory when you close
the display or press the suspend hot key Fn+Esc (
). The computer wakes up when you
reopen the display or press any key.
Note:  If an external monitor is connected to the computer, the
computer will not enter suspend mode if you close the display.
To enter suspend mode, disconnect the external monitor, open
and reclose the display.
Important!  Sleep Manager automatically creates a suspend-
to-disk file when it is run. If the file becomes invalid, suspend-
to-disk mode becomes unavailable, and the computer
automatically switches to suspend-to-memory mode.
3.4.2  Suspend to Disk on Critical Battery
W ith this parameter is set to Enabled, the computer enters suspend-to-disk mode when the battery
becomes critically low. The default setting is Enabled.
3.4.3  Display Always On
This parameter lets you specify whether the display is always on or not. W hen enabled, the screen
will not blank. To save power, the default setting is Disabled.
3.4.4  Resume On Modem Rings
You can set the computer to resume from suspend-to-memory mode upon detection of a specific
number of modem rings, ranging from 1 to 7. Enabling this option overrides the suspend-to-disk
function.