Acer Extensa 660 Maintenance Manual

							                                                                                           Troubleshooting Procedures    5-21  
Figure 5-5  FDD Interface Troubleshooting Diagram
4
BIOS MenuSetupEnter Correct FDD type
Floppy Diskette
properly formatted?Format Diskette or
Change Diskette
FDD Power  Checked?
Check U605 (9956)
Pin1=5V, CN29 Pin53
(motor-ON0#)=5V
FDD Motor Checked?Check CN17 Pin51
(Motor-0N04) signal
END
Yes
No
Yes
Yes
No
No
No
Seek Operation Checked?
Check Read or Write
Operation
Check CN17 Pin44
(TRK0), Pin50 (step #),
PIN 60 (Index#) Signals
Check CN17
PIN48(Write-Data#),
PIN46(Write-Gate#),
PIN40(F-Read-Data#)
Yes
Yes
Yes
No
No
O.K.?
System Fails to Boot:
FDD Interface Check 
						

							5-22   Troubleshooting Procedures
Figure 5-6  HDD Interface Troubleshooting Diagram
5
BIOS Setup O.K.?Enter Correct HDD type
or Auto to Setup Item
 Hard Disk properly
formatted?
Use DOS FDISK
program and Format
Check HDD PowerCheck U605 (9956)
Pin3=5V
Check HDD Data Bus
PIN 36, 37, 38, 39, 50,
51, 52, 53, 62, 63, 64,
END
Yes
No
Yes
Yes
No
No
No
Check HDD Address
Bus
Check U13
 Pin688, Pin69, Pin70,
HSA0, HSA1,HSA2
Yes
Yes
No
Hard Disk
Check U13
65, 71, 72, 73, & 74
System Fails to Boot:
HDD Interface Checks 
						

							                                                                                           Troubleshooting Procedures    5-23  
Figure 5-7  Keyboard Interface Troubleshooting Diagram
6
Keyboard FPC Cable
O.K.?Check FPC Cable:
Broken or not
Checked Keyboard
Interrupt?Check U8(M38813)
Pin15, IRQ1
Checked Keyboard
Scanning Signals?
END
Yes
No
Yes
No
Check CN18
PIN 1 ~ PIN 15 (X1~15)
Check CN16
PIN 1 ~ PIN 8 (Y0~7)
Check U8 Entire Circuit
Yes
No
System fils to boot:
Keyboard Interface Checks 
						

							5-24   Troubleshooting Procedures
Figure 5-8  CD-ROM Interface Troubleshooting Diagram
7
Checked  CD-ROM Power?Check U605(9956) Pin1
VCC-CDROM=5V
Checked  CD-ROM Data
Bus?Check U13
PIN 36, 37, 38, 39, 50,
51, 52, 53, 62, 63, 64,
65, 71, 72, 73, & 74
Checked CD-ROM
Address Bus?Check U13
PIN68, PIN69, PIN70,
HSA0, HSA1, HSA2
Checked  IRQ Signal?Check U13 Pin86,
DIRQ15
END
Yes
No
Yes
Yes
Yes
No
No
No
System Fails to Boot:
CD-ROM Interface Checks 
						

							                                                                                           Troubleshooting Procedures    5-25  
Figure 5-9  Glidepad Interface Troubleshooting Diagram
System Fails to Boot:
Glide Pad Interface Checks
8
Check GLide Pad Data
SignalCheck CN21 Pin2
GLPDATA Signal
Check Glide Pad Power
Check CN21 Pin3
GLPCLK Signal
Check Glide Pad PowerCheck CN21 Pin1=5V
Check Glide Pad IRQCheck U8(38813)
Pin14 IRQ12
END
Yes
No
Yes
Yes
Yes
No
No
No 
						

							5-26   Troubleshooting Procedures
Figure 5-10  DC/DC Converter Interface Troubleshooting Diagram
PRESS POWER
SWITCH
9
DC-IN = 20V
BAT = 12VCheck T3, F1, D12,
D11, F2, Q5, D14
SW2 = 5VCheck M/BCheck SW1
Check CN33 PIN4
 for low pulseCheck SW2
U1, PIN 7
Check D29, D2, D3, U2,
Q1, Q2, Q3, Q4, C14, R13,
R14, D4, D5, R8, R9, R10,
R11, R1
0V
5V
END
NO
YES
NO
NO
NO
YES
YES
YES
5V
0V
System Fails to Boot:
DC/DC Converter Interface Checks 
						

							                                                                                           Troubleshooting Procedures    5-27  
Figure 5-11  Battery Charger Interface Troubleshooting Diagram
System Fails to Boot:
Battery Charger Interface Checks
DC_IN=19V
Check F1, T3
U4=5V
Check D18
Charge Battery 1 or
Charge Battery 2Check Charger Control
Board (RBC3) U1, D8,
D7
Check Battery Pack
Voltage & Temp
END
Yes
No
Yes
Yes
No
No
Plug-In AC Adapter
10 
						

							5-28   Troubleshooting Procedures
Figure 5-12  LED Indicator Function Troubleshooting Diagram
Check Caps Lock LEDCheck CN11 Pin4 CAP#=0V
Check NUM Lock LEDCheck CN11 Pin7 NUM#=0V
HDD Read/Write LEDCheck CN7 Pin 3
END
Yes
No
Yes
Yes
No
No
Check CD-ROM, FDD, & LED
Check Power Management LED
Check CN11 Pin2 CD/FDD/HDD-
LED#=OV, while any device access
Check Con11 Pin5 PMUEN#=0V, while
power management (BIOS) enable
Yes
Yes
No
No
Clock Suspend LED Blanking
Check Charge LED
Check CN11 Pin6
SUS-LED#=5V~0V, 0V~5V
Check CN11 Pin8 CHarge=5V, while
battery is charging
Yes
No
Yes
11LED Indicator Function
Troubleshooting  
						

							                                                                                           Troubleshooting Procedures    5-29  
Figure 5-13  Serial Port Function Troubleshooting Diagram
12
Check BIOS Setup
Enter Correct type for
COM1
Check Transmitting
Signal
Check U1(MAX213)
SOUT1
Check Receiving Signal
Check U1(MAX213)
SIN1
Check MD(0~63)Check U21(87338) Pin1,
Pin100, IRQ3,IRQ4
END
Yes
No
Yes
Yes
Yes
No
No
No
System Boots:
Serial Port Checks 
						

							5-30   Troubleshooting Procedures
Figure 5-14  Suspend Function Troubleshooting Diagram
Suspend Function Troubleshooting 13
Check BIOS Power
Management SetupEnter Correct type
Suspend to RAMSuspend to Disk
Check Suspend SignalCheck U9 Pin 3
(SUSPEND#=0V)
Check Resume
OperationCheck U9 Pin 3
Suspend#= 5V
END
Yes
No
Yes
Yes
Yes
NoCheck Suspend SignalCheck U9 Pin 3
Susepend
Check Resume
OperationCheck U9 Pin 3
Suspend#=5V
Yes
Yes
No
NoNo