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,...

Numeric Error Codes

The following is a list of the messages that the BIOS can display. Most of them occur during POST. Some of them display information about a hardware device, e.g., the amount of memory installed. Others may indicate a problem with a device, such as the way it has been configured. Following the list are explanations of the messages and remedies for the reported problems. Note If the system fails after you make changes in the Setup menus, reset the computer, enter Setup and install Setup defaults...

DCAC Inverter

Ambit T62.086.C 12.1 T622.087.C.00 13.3 amp 14.1 Supply voltage for LCD backlight Vrms Maximum input current A, 90Vac, full load The maximum inrush current will be less than 50A and 100A when the adapter is connected to 115Vac 60Hz and 230Vac 50Hz respectively. It should provide an efficiency of 83 minimum, when measured at maximum load under 115V 60Hz amp 230Vac 60Hz Hold up time ms 115 Vac input, full load Output can be shorted without damage 3000 Vac or 4242 Vdc , 10mA for 1 second VDE 243...

Disassembling the Cdrom Drive

Push the CD-ROM drive locker forward and carefully pull out the CD-ROM module. 2. To disassemble the CD-ROM module, remove the 2 screws from both sides of the CD-ROM module and the screw on the CD-ROM chassis. 3. Remove the CD-ROM drive from the CD-ROM chassis. 4. Disconnect the cable of the CD-ROM drive.

Setting LCD Panel ID

There is an EEPROM in the inverter which stores its supported LCD type ID code. If you replace an LCD with one of a different brand or use a new inverter, the ID information in the inverter EEPROM should be updated. Follow the steps below to see the LCD Panel ID 1. Follow the instructions on-screen to read current or to set new LCD Panel ID code. Note When you set a new LCD Panel ID and the new LCD is not yet enabled to function , connect an external CRT to see the program execution process....

Power System Checkout

To verify the symptom of the problem, power on the computer using each of the following power sources 1. Remove the battery pack and diskette drive. 2. Connect the AC Adapter and check that power is supplied. 3. Disconnect the AC Adapter and install the charged battery pack then check that power is supplied by the battery pack. If you suspect a power problem, see the appropriate power supply checkout in the following list Checking the AC Adapter Checking Operational Charging Checking the...

Opening and Closing the Display

To open the display, slide the display cover latch to the left and lift up the cover. Then tilt it to a comfortable viewing position. The computer employs a microswitch that turns off the display and enters standby mode to conserve power when you close the display cover, and turns it back on when you open the display cover. Note If an external monitor is connected, the computer turns off the display but does not enter standby mode when you close the display cover. To close the display cover,...

CDROM Driver Test

Do the following to isolate the problem to a controller, drive, or CD-ROM. Make sure that the CD-ROM does not have any label attached to it. The label can cause damage to the drive or can cause the drive to fail. Do the following to select the test device 1. Boot from the diagnostics diskette and start the PQA program please refer to Running PQA Diagnostics Program. 2. Go to the diagnostic CD-ROM in the test items. 4. Follow the instructions in the message window. If an error occurs, reseat the...

Running the Diagnostics

Note Before running the PQA Diagnostics Program, make sure that the write enable tab of the Diagnostic Program Diskette is set to enabled. Press - gt or lt - to move around the main menu. Press enter to enable the selected option. The main options are Diag, Result, Syslnfo, Option and Exit. The Diag option lets you select testing items and times. The following screen appears when you select Diag from the main menu This screen allows you to specify the number of tests to perform. The options are...

Disassembling the Lower Case Removing the Floppy Disk Drive

Remove the three screws of the floppy disk drive. 2. Lift the floppy disk drive from the lower case. 3. Remove the two screws from the floppy frame. 4. Separate the floppy disk drive from its frame. 5. Carefully, disconnect the floppy cable from the floppy drive. 5. Carefully, disconnect the floppy cable from the floppy drive.

Disassembling the Upper Case

Acer Travelmate 720

To detach the upper case, first remove the two screws from the upper heat sink then lift the upper heat sink up and out. 2. Remove the floppy cable at CN18 from the system board. 3. Remove the mouse cable at CN19 from the system board. Remove the 11 screws from the upper case and the base of the unit. 5. Disconnect the suspend cable at CN9, the left channel speaker at CN10 and the right channel speaker at CN11. 6. Remove the upper case from the lower case. 7. To reinsert the upper case into...

Hardware Configuration and Specifications

Duplicate of code assignment at 0E0000-0FFFFF Interrupt channel default assignment Interrupt channel default assignment Interrupt channel default assignment Interrupt channel default assignment Keyboard controller 8742 chip select Intel Dixson 300 333Mhz MMC-2 module 1. Intel Pentium II architecture 2. 16 KB instruction cache and 16 KB data cache with MMX Technology 3. Quick Start for low power, low exit latency clock throttling PCI 2.1, APM 1.2, DMI 2.00.1, E-IDE, ACPI 1.0, ESCD 1.03, ANSI ATA...

FRU Field Replaceable Unit List

This chapter gives you the FRU Field Replaceable Unit listing in global configurations of TravelMate 720. Refer to this chapter whenever ordering for parts to repair or for RMA Return Merchandise Authorization . Please note WHEN ORDERING FRU PARTS, that should check the most up-to-date information available on your regional web or channel. If for whatever reason a part number change is made, it will not be noted on the printed Service Guide. For ACER AUTHORIZED SERVICE PROVIDERS, your Acer...