Acer Extensa 660 Maintenance Manual

							                                                                                           Troubleshooting Procedures    5-31  
Figure 5-15  Cover Switch Function Troubleshooting Diagram
Figure 5-16  Cover Close Function Troubleshooting Diagram
Check BIOS SetupEnter Correct Value
Check SwitchPress Cover Switch
Check COVSW#=0V
END
Yes
No
Yes
No
System Boots:
Cover Switch Function Checks
14
15
Cover Close Check
Check COVSW#:Check D18, R112,C58
Check COVSW#:Normally HighLow pulse when Cover
ClosesCheck D18, R112,C58
END
YES
NO
NO
YES
YES
Low when cover closedHigh when cover open
System Boots:
Cover Close Function Checks 
						

							5-32   Troubleshooting Procedures
Figure 5-17  External Keyboard Function Troubleshooting Diagram
Figure 5-18  PS/2 External Mouse Function Troubleshooting Diagram
16
Check Keyboard DataCheck U8(38813)
Pin17 EXT1DATA
Signal
Check Keyboard ClockCheck U8(38813)
Pin16 EXT1CLK
Check IRQ SignalCheck U8(38813)
PIN15 IRQ1
END
Yes
No
Yes
Yes
No
System Boots:
External Keyboard Checks
17
Check Mouse DataCheck U8(38813)
Pin12 EXT2DATA
Check Mouse ClockCheck U8(38813)
Pin13 EXT2CLK
Check IRQ SignalCheck U8(38813)PIN14 IRQ12
END
Yes
No
Yes
Yes
No
No
System Boots:
PS/2 External Mouse Interface Check 
						

							                                                                                           Troubleshooting Procedures    5-33  
Figure 5-19  Printer Port Interface Troubleshooting Diagram
18
Check BIOS SetupEnter Correct Type ofPrinter
Check the Data BusCheck RP5, RP7
Check Busy Signal
END
Yes
No
Yes
No
Check RP2 Pin6(BUSY)
Check U21(87338)
Entire Circuit
Yes
No
System Boots:
Printer Port Interface Checks 
						

							   Field Service   6-1
6
Field Service
6.1 Introduction
This section contains general  preventive and corrective maintenance procedures that 
apply to all members of the Extensa 660 Notebook family. The first part of the section 
describes the computer cleaning procedures and preferred handling procedures for 
sensitive components (e.g., disk drives, batteries).
The second part of the section identifies all field-replaceable parts; the remainder of the 
section contains removal and replacement procedures for the field-replaceable parts.
6.2 Preventive Maintenance
Preventive maintenance is limited to cleaning the plastic case, keyboard and the display 
screen.
6.2.1 Cleaning the Computer
When it is necessary to clean the plastic case and keyboard use a soft, lint-free cloth, 
slightly dampened with a mild detergent solution or use the contents of any 
commercially available computer cleaning kit.
Caution: Never  spray any liquids directly on the computer case, keyboard, 
or screen. If the liquid-crystal display (LCD) screen has become smeared 
or dusty, clean the screen first with a soft, clean, lint-free cloth and gently 
wipe the glass. If the glass is still smeared, use distilled water or a 25% 
solution of alcohol and distilled water.
Caution: Do not use paper towels to clean the display screen. Paper can 
scratch the display screen matte.
6.2.2 Handling the Computer
The notebook computer requires reasonable care and handling for extended life. Some 
of the precautions to follow to protect your computer against accidental damage include:
¨Never pick up or carry the unit by the cover.
¨Do not force the cover beyond its fully opened position (about 180 degrees).
¨Never subject the computer to harsh environments (dusty areas or areas of 
rapidly changing temperatures). 
						

							6-2   Field Service 
¨Never place anything on top of the computer, particularly when it is operating 
or charging (could result in overheating and damage to the computer).
¨Never move the computer while the hard drive is rotating (press the 
Suspend button to put the computer in a Sleep mode before closing cover).
¨Never expose the computer hard disk drive(s) or disks to strong magnetic 
fields such as those generated by transformers, speakers, or telephone 
handsets.
6.2.3  Handling the Computer Battery Pack
The battery pack furnished with the computer requires reasonable care and handling 
to ensure efficient operation and maximum life. Periodically inspect the battery 
terminals and the batteries for evidence of corrosion and oxide build-up; clean if 
necessary.
To ensure that the battery packs endure normal life cycle, always observe the following 
precautions when handling the battery packs:
¨Do not drop the battery pack or subject it to excessive shock and vibration.
¨Do not expose the battery pack to direct sunlight, moisture, or chemical 
compounds.
¨Do not disassemble the battery pack.
¨Do not use the battery pack to power other devices.
¨Do not short the battery leads or connect the battery with reversed polarity. 
¨Never attempt to charge the battery pack in any way other than as described 
in this manual.
¨Always charge the battery pack as soon as possible after a low battery 
indication. 
6.2.4 Password Caution
The notebook computer can be password protected to prevent unauthorized use. 
However, if the password is lost, the notebook must be returned to the Texas 
Instruments manufacturing facility in Temple, Texas U.S.A. to restore access. This 
service is not covered by warranty. 
						

							Field Service    6-3
6.3 Required Tools and Equipment
All Extensa Notebook corrective maintenance procedures can be performed using the 
following tools:
¨Tweezers
¨Plastic Stick
¨Small flat-blade screwdriver
¨Small Phillips® screwdriver
¨5 mm Nut Driver
Caution: All boards, options and peripherals contain components that are 
sensitive to static electricity. When handling any of these items, protect 
against static electricity by using wrist grounding straps and grounded 
working mats. When moving or storing items, use the anti-static bags 
supplied with the items.
6.4 Notebook FRUs
Table 6-1 lists and describes the various FRUs for the Extensa 660 Series. As shown 
in Figure 6-1, all members of the Extensa 660 Series Notebook Computers contain two 
major assemblies including the System Base Assembly and the Cover Display Assembly.
Figure  6-1  Extensa 660  Series Assemblies
Display
Assembly
Base
Assembly 
						

							6-4   Field Service 
6.4.1 Cover-Display Assembly
The Cover -Display Assembly shown in Figure 6-2, contains the LCD screen, DC-AC 
Inverter Board, DC-DC Inverter Board,  bezel LCD cover and various other components 
as listed in Table 6-1.
Figure  6-2  Cover Display Assembly FRUs
Flex Cable, 
Main to
Transfer
LCD Flex
Cable
Display
Cover
Display
Bezel
LCD
Panel
Inverter
PWB
Transfer
PWB Assembly
Flex Cable,
Transfer to 
Inverter 
						

							Field Service    6-5
 
6.4.2 System Base Assembly
As shown in Figure 6-3, the System Base Assembly houses a variety of field-replaceable 
subassemblies and components. The various assemblies and reference paragraph  
numbers containing removal/replacement procedures are listed in Table 6-2. Table 
6-3 contains a listing of Customer -Replaceable Units (CRUs).Table 6-1  Cover Display Assembly FRU Listing
 FRU Description Assembly/
Disassembly 
ParagraphTI Part No.
LCD Panel, 11.3, TFT (HO) 6.5.17 9813168-0001
LCD Panel, 11.3, TFT (LG) 6.5.17 9813169-0001
LCD Panel, 12.1, DSTN (SANYO) 6.5.17 9813170-0001
Display Back Cover, 11.3 (HO) 6.5.17 9813165-0001
Display Back Cover, 11.3 (LG) 6.5.17 9813207-0001
Display Back Cover, 12.1 (SANYO) 6.5.17 9813167-0001
11.3  Display Bezel 6.5.17 9813164-0001
12.1 Display Bezel 6.5.17 9813166-0001
11.3 LCD Flex Cable (HO) 6.5.17 9813150-0001
11.3 LCD Flex Cable, TFT (LG) 6.5.17 9813199-0001
12.1 LCD Flex Cable, DSSTN (SANYO) 6.5.17 9813149-0001
Inverter PWB Assembly (DELTA) 6.5.17 9813162-0001
Transfer-Inverter Flex Cable Assembly 6.5.17 9813153-0001
Transfer-Main Board Flex Cable 6.5.17 9813154-0001
Transfer PWB, Main Board to LCD (SANYO) 6.5.17 9813191-0001
Transfer PWB, Main Board to LED (HO, LG) 6.5.17 9813190-0001 
						

							6-6   Field Service 
Figure 6-3  System Base Assembly FRUs
Audio PWB
Button
PWB
Power
Supply
PWB
CMOS Battery
CPU PWB
Glidepad
Main PWB
Top Cover
Assembly
Heat Sink
Assembly Keyboard
Assembly
Bottom
Case
Assembl
yBattery/HDD
Transfer PWB
PCMCIA
Door