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,...

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...

                                                                                           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...

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...

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...

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...

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