Acer Aspire 7520 7220 Series User Manual

							Chapter 367
7.Disconnect the touchpad FFC, left speaker cable, button board FFC, and LED board FFC from the main 
board.
8.Carefully detach the upper case assembly from the lower case assembly.
Disassembling the Lower Case Assembly
1.Remove the two screws fastening the audio board to the lower case.
2.Detach the audio board cable from the main board.
3.Remove the audio board from the main unit.
1.Disconnect the USB cable from the main board.
2.Remove the screw fastening the USB board and take out the board and its cable from the lower case.
3.Then detach the USB cable from the USB board. 
						

							68Chapter 3
4.Pull the RF board cable free from the main unit.
5.Remove the screw fastening the RF board to the lower case assembly.
6.Remove the four screws fastening the ODD board to the main board.
7.Take out the ODD board as shown.
8.Remove the four screws fastening the main board to the lower case.
9.Detach the main board from the lower case as shown.
10.Turn the main board over, then remove the DC-in connector from the board as shown.
11 .Remove the three screws fastening the subwoofer to the lower case.
12.Remove the subwoofer as shown. 
						

							Chapter 369 
						

							70Chapter 3
Disassembling the Upper Case Assembly
1.Turn the upper case over.
2.Remove the two screws fastening the button board.
3.Detach the button board with FFC from the upper case as shown.
4.Remove the two screws fastening the LED board.
5.Detach the LED board with FFC from the upper case as shown.
6.Remove the four screws fastening the speakers.
7.Remove the speakers from the upper case as shown. 
						

							Chapter 371
Disassembling the LCD Module
1.Remove the four screw rubbers as shown.
2.Then remove the four screws fastening the LCD bezel.
3.Detach the LCD bezel from the LCD module carefully.
4.Remove the four screws holding the LCD to the LCD panel.
5.Detach the CCD cable connector from the CCD board.
6.Take out the CCD module from the LCD panel.
7.Remove the screw fastening the CCD board to the CCD bracket.
8.Lift out the LCD from the LCD panel as shown.
9.Detach the two inverter cable connectors from the inverter board. 
						

							72Chapter 3
10.Remove the four screws fastening the left LCD bracket and detach it.
11 .Remove the four screws fastening the right LCD bracket and detach it.
12.Disconnect the LCD cable from the rear side of the LCD. 
						

							Chapter 373
Disassembling the External Modules
Disassembling the HDD Module
1.Remove the four screws holding the HDD (hard disk drive) case; two on each side.
2.Carefully slide out the hard disk drive from the HDD case.
Disassembling the ODD Module
1.Remove the three screws holding the optical bracket.
2.Then remove the optical bracket from the optical disk drive. 
						

							Chapter 475
Use the following procedure as a guide for computer problems.
NOTE: The diagnostic tests are intended to test only Acer products. Non-Acer products, prototype cards, or 
modified options can give false errors and invalid system responses.
1.Obtain the failing symptoms in as much detail as possible.
2.Verify the symptoms by attempting to re-create the failure by running the diagnostic test or by repeating 
the same operation.
3.Use the following table with the verified symptom to determine which page to go to.
Symptoms (Verified)Go To
Power failure (The power indicator does not go 
on or stay on).“Power System Check” on page 77
POST does not complete. No beep or error 
codes are indicated.“Power-On Self-Test (POST) Error Message” on 
page 80
“Undetermined Problems” on page 92
POST detects an error and displayed messages 
on screen.“Error Message List” on page 81
Other symptoms (i.e. LCD display problems or 
others).“Power-On Self-Test (POST) Error Message” on 
page 80
Symptoms cannot be re-created (intermittent 
problems).Use the customer-reported symptoms and go to 
“Power-On Self-Test (POST) Error Message” on 
page 80
“Intermittent Problems” on page 91
“Undetermined Problems” on page 92
Troubleshooting
Chapter 4 
						

							76Chapter 4
System Check Procedures
External Diskette Drive Check
Do the following to isolate the problem to a controller, driver, or diskette. A write-enabled, diagnostic diskette is 
required.
NOTE: Make sure that the diskette does not have more than one label attached to it. Multiple labels can cause 
damage to the drive or cause the drive to fail. 
Do the following to select the test device:
1.Boot from the diagnostics diskette and start the diagnostics program.
2.See if FDD Test is passed as the program runs to FDD Test.
3.Follow the instructions in the message window.
If an error occurs with the internal diskette drive, reconnect the diskette connector on the system board.
If the error still remains:
1.Reconnect the external diskette drive/DVD-ROM module.
2.Replace the external diskette drive/CD-ROM module.
3.Replace the main board.
External CD-ROM Drive Check
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 diagnostics program.
2.See if CD-ROM Test is passed when the program runs to CD-ROM Test.
3.Follow the instructions in the message window.
If an error occurs, reconnect the connector on the System board. If the error still remains:
1.Reconnect the external diskette drive/CD-ROM module.
2.Replace the external diskette drive/CD-ROM module.
3.Replace the main board.
Keyboard or Auxiliary Input Device Check
Remove the external keyboard if the internal keyboard is to be tested.
If the internal keyboard does not work or an unexpected character appears, make sure that the flexible cable 
extending from the keyboard is correctly seated in the connector on the system board.
If the keyboard cable connection is correct, run the Keyboard Test. 
If the tests detect a keyboard problem, do the following one at a time to correct the problem. Do not replace a 
non-defective FRU:
1.Reconnect the keyboard cables.
2.Replace the keyboard.
3.Replace the main board.
The following auxiliary input devices are supported by this computer:
qNumeric keypad
qExternal keyboard