Acer Travelmate 7720 Service Guide

							Chapter 4121
The system doesnt resume from 
hibernation mode.See “Save to Disk (S4)” on page 39.
Hard disk connection board
Hard disk drive
System board
The system doesnt resume from standby 
mode after opening the LCD.See “Save to Disk (S4)” on page 39.
LCD cover switch
System board
Battery fuel gauge in Windows doesn’t go 
higher than 90%. Remove battery pack and let it cool for 2 hours.
Refresh battery (continue use battery until power off, then 
charge battery).
Battery pack
System board
System hangs intermittently. Reconnect hard disk/CD-ROM drives. 
Hard disk connection board
System board
Peripheral-Related Symptoms
Symptom / ErrorAction in Sequence
System configuration does not match the 
installed devices. Enter BIOS Setup Utility to execute “Load Default Settings”, 
then reboot system.
Reconnect hard disk/CD-ROM/diskette drives.
External display does not work correctly. Press Fn+F5, LCD/CRT/Both display switching
System board
USB does not work correctly System board
Print problems. Ensure the “Parallel Port” in the “Onboard Devices 
Configuration” of BIOS Setup Utility is set to Enabled.
Onboard Devices Configuration
Run printer self-test.
Printer driver
Printer cable
Printer
System Board
Serial or parallel port device problems. Ensure the “Serial Port” in the Devices Configuration” of 
BIOS Setup Utility is set to Enabled.
Device driver
Device cable
Device
System board
Keyboard/Touchpad-Related Symptoms
Symptom / ErrorAction in Sequence
Keyboard (one or more keys) does not 
work.Reconnect the keyboard cable.
Keyboard
System board Power Management-Related Symptoms
Symptom / ErrorAction in Sequence
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							122Chapter 4
NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 124. Touchpad does not work. Reconnect touchpad cable.
Touchpad board
System board
Modem-Related Symptoms
Symptom / ErrorAction in Sequence
Internal modem does not work correctly. Modem phone port
modem combo board
System board Keyboard/Touchpad-Related Symptoms
Symptom / ErrorAction in Sequence
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							Chapter 4123
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a 
hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement 
should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1.Run the advanced diagnostic test for the system board in loop mode at least 10 times.
2.If no error is detected, do not replace any FRU.
3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors. 
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							124Chapter 4
Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, 
whether a short circuit is suspected, or whether the system is inoperative. 
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
NOTE: Verify that all attached devices are supported by the computer.
NOTE: Verify that the power supply being used at the time of the failure is operating correctly. (See “Power 
System Check” on page 107.):
1.Power-off the computer.
2.Visually check them for damage. If any problems are found, replace the FRU.
3.Remove or disconnect all of the following devices:
Non-Acer devices
Printer, mouse, and other external devices
Battery pack
Hard disk drive
DIMM 
CD-ROM/Diskette drive Module
PC Cards
4.Power-on the computer.
5.Determine if the problem has changed.
6.If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7.If the problem remains, replace the following FRU one at a time. Do not replace a non-defective FRU:
System board
LCD assembly
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							Chapter 5125
Top View
No.DescriptionNo.Description
1 Power Cable Connector  5 Fingerprint/Touchpad 
Connector
2 LCD Cable Connector 6 Bluetooth Connector
3 Touchpad Board Connector 7 Speaker Connector
4 Keyboard Connector
Jumper and Connector Locations
Chapter 5
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							126Chapter 5
Bottom View
No.DescriptionNo.Description
1CPU 7USB Connector
2 SATA Connector 8 Card Reader 
3 PC Card Reader 9 Line-out jack
4 LAN Connector 10 Mic-in jack
5 CRT Connector 11 Headphone jack
6 1394 Connector
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							Chapter 5127
Standard Operation Procedures of Password Bypassing and BIOS Recovery
For RD and CSD to debug easily, the system provide one hardware DIP switch for Bypassing Password 
Check, and one Hotkey to enable BIOS Recovery.
1.DIP Switches: 
2.Hotkey to enable BIOS Recovery: Fn+ESC, then Power Button. To use this function, it is strongly 
recommended that the AC adapter is connected to the system and plug-in to a wall outlet and the Battery 
is also in the system
Bypassing Password Check (SW1): If the user has set Password (power-on or setup password) for security 
reason, BIOS will check password during POST or when entering the BIOS setup menu. However, if it is 
necessary to ignore the password check, the user may enable DIP SW1 to bypass password check.
BIOS Recovery: Boot Block is a special block of BIOS. It is used to boot up the system with minimum BIOS 
initialization. The user can enable this feature to restore the BIOS to a successful one if previous BIOS flashing 
process fails.
1.DIP Location:
RD/CSD can enable or disable this function by switching the DIP. The DIP switch is located as shown in the 
figure below:
2.Clear Password
DIP SW1: Bypassing Password Check, Disabled by default. Switching it to ON then powering on the system 
will force the BIOS to clear Supervisor and User passwords. The power-on, setup password, and the HDD 
password are all cleared.
3.Restore BIOS by the Crisis Disk
Enable this function by pressing the combination: Fn+ESC, and pressing the Power Button. To use this 
function, it is strongly recommended that the AC adapter is connected to the system and plug-in to a wall outlet 
and the Battery is also in the system. If this function is enabled, the system will force the BIOS to enter a 
DIPDefault SettingDescription
SW1 Disabled (High) Bypassing Password Check
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							128Chapter 5
special BIOS block, called BootBlock. RD/CSD can use this special BIOS code to recover the BIOS to a 
successful one if previous BIOS flashing process fails. However, before doing this, one Crisis Disk should be 
prepared in WinXP. Detailed steps are as the followings:
a.Prepare the Crisis Disk in WinXP.
b.Insert the Crisis Disk to a USB floppy drive which is attached to the failed machine.
c.While the system is turned off, press and hold Fn+ESC, then press Power Button. The system 
should be powered on with Crisis Recovery process.
d.BootBlock BIOS starts to restore the failed BIOS code. Short beeps should be heard when flashing.
e.If the flashing process is finished, a long beep should be heard.
f.Power down the system after you hear the long beep.
If the crisis recovery process is finished, the system should be powered on with the successful BIOS. RD/CSD 
can then update the BIOS to a workable one by regular BIOS flashing process.
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							Chapter 6129
This chapter gives you the FRU (Field Replaceable Unit) listing in global configurations of TravelMate 5710/5310 and 
Extensa 5610/5210. Refer to this chapter whenever ordering for parts to repair or for RMA (Return Merchandise 
Authorization).
Please note that WHEN ORDERING FRU PARTS, you should check the most up-to-date information available on your 
regional web or channel. For whatever reasons a part number change is made, it will not be noted on the printed Service 
Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code from 
those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided by your regional Acer 
office to order FRU parts for repair and service of customer machines.
NOTE: To scrap or to return the defective parts, you should follow the local government ordinance or regulations on how to 
dispose it properly, or follow the rules set by your regional Acer office on how to return it.
FRU (Field Replaceable Unit) List
Chapter 6
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							130Chapter 6
TravelMate 7720/7320 Exploded Diagram
TravelMate 7720/7320 FRU List
CategoryNo.Part Name and DescriptionAcer Part No.
Adapter
ADAPTER 90W DELTA ADP-90SB 
BBDARAP.09001.010
ADAPTER 90W DELTA ADP-90SB 
BBEA LFAP.09001.013
ADAPTER 90W LITEON PA-1900-
04WRAP.09003.005
ADAPTER 90W LITEON PA-1900-
24ARAP.09003.011
Battery-
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