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Replacing the Backlit Screen Element

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If the plug has retaining screws, tighten them with a screwdriver. 5. If necessary, plug the monitor's power cable first into the power inlet on the monitor. (Some monitors come with permanently attached power cables.) Then plug the power cable into an electrical outlet. 6. Turn off DIP switch 4 above the keyboard to let the computer know you will be using a monitor instead of the LCD screen. (See "Setting the DIP Switches" in Chapter 1.) When you are ready to use the computer, turn on the monitor and any other peripherals, and then turn on the computer. Text will be displayed on the monitor screen instead of the computer screen. Replacing the Backlit Screen Element If you need to replace the electroluminescent element in the backlit screen, follow the instructions below. The procedure has many steps, but they are not difficult. Still, you must be very careful not to damage any components on or inside the screen. If you have any reservations about doing this yourself, ask your dealer to install it for you. 1. Turn off all peripherals and the computer before you begin. 2. Use a flat blade screwdriver to remove the plastic tops of the brightness and contrast switches. A-2 Options and Maintenance

Section	Page
FRONT MATTER	1
CONTENTS	8
INTRODUCTION	13
How to Use This Manual	14
CHAP 1-SETTING UP YOUR SYSTEM	16
Unpacking	16
Connecting the Screen	17
Connecting the AC Adapter	20
Charging the Battery	21
Connecting a Printer	21
Parallel interface	22
Serial interface	24
Setting the DIP Switches	25
Keyboard DIP switches	26
Back panel DIP switches	28
Turning On the Computer	29
Safety rules	29
Turning on the power	30
Adjusting screen contrast and brightness	31
Initial screen display	32
Loading MS-DOS	32
Copying System Diskettes	34
Copying with two diskette drives	34
Copying with one diskette drive	35
Running the Setup Program	37
Setting the real-time clock	38
Changing the backlight period	39
Changing the serial port (RS-232C) settings	40
Leaving the Setup program	43
CHAP 2-PREPARING A HARD DISK FOR USE	44
Creating the MS-DOS Partition	45
Formatting the MS-DOS Partition	46
Copying the Reference Files to the Hard Disk	48
Booting From the Hard Disk	48
Drive Assignments	49
Hard Disk Power Switch	49
CHAP 3-USING THE EQUITY LT	50
Using the AC Adapter	50
Using the Battery	50
LED Indicators	52
Opening and Closing the Screen	53
Using the Handle	54
Selecting Execution Speed	54
Resetting the Computer	55
Caring for the Backlit Screen	56
Special Keys on the Equity LT Keyboard	56
The Equity LT Character Set	58
Using Disks and Disk Drives	58
How disks work	58
Choosing diskettes for the Equity LT	59
Caring for disks and disk drives	60
Inserting and removing diskettes	61
Making backup copies	62
Write-protecting diskettes	62
Using a single diskette drive	63
Turning Off the Computer	64
CHAP 4-USING MS-DOS WITH THE EQUITY LT	65
Starting and Exiting MS-DOS	66
Entering MS-DOS Commands	67
Storing Data	68
Changing the Default Drive	69
Formatting Diskettes	70
Formatting with two diskette drives	70
Formatting with one diskette drive	71
Copying Data	72
Using the DISKCOPY command	72
Copying with two 3 1/2-inch diskette drives	72
Copying with one 3 1/2 -inch diskette drive	73
Copying with one 5 1/4-inch diskette drive	75
Using the COPY command	76
Listing the Contents of a Diskette	78
Creating and Using Subdirectories	78
Creating subdirectories	79
Changing directories	80
Using pathnames	81
Copying from one subdirectory to another	82
Starting an Application Program	82
MS-DOS Commands and the Equity LT	83
Using the backlit screen with memory resident programs	83
APPENDIX A-OPTIONS AND MAINTENANCE	84
Connecting a Color Monitor	84
Replacing the Backlit Screen Element	85
Turning Off the Hard Disk	92
Turning off the hard disk first	92
Turning off the hard disk later	92
APPENDIX B-TROUBLESHOOTING	95
Error Messages	95
The Computer Fails to Start Up	95
The LCD Screen is Blank	96
The Monitor Screen is Blank	96
The Computer Does Not Respond	97
Low Battery Problems	97
Diskette Problems	98
Hard Disk Problems	99
Software Problems	99
Printer Problems	100
APPENDIX C-POWER-ON DIAGNOSTICS	101
System Device Check	101
Clock and CMOS RAM Check	102
RAM Check	102
Keyboard Controller and Keyboard Check	103
Floppy Disk Drive Seek Check	103
Hard Disk Controller and Hard Disk Check	104
APPENDIX D-PERFORMING SYSTEM DIAGNOSTICS	105
Starting System Diagnostics	105
Selecting a Test	106
Resuming From an Error	107
System Board Check	108
Memory Check	108
Keyboard Check	109
Video Adapter and Display Check	110
Video adapter check	111
Attribute check	112
Character set check	112
40-column character set check	113
320 x 200 graphics mode check	113
640x 200 graphics mode check	114
Screen paging check	115
Color video check	116
Sync check	116
Run all above checks	116
Floppy Disk Drives and Controller Check	117
Formatting a diskette	117
Starting the floppy disk drive check	118
Sequential seek check	119
Random seek check	119
Write, read check	119
Speed check	120
Run all above checks	121
Parallel Port (Printer Interface) Check	121
Serial Port (RS-232C) Check	121
Alternate Serial Port Check	123
Dot-matrix Printer Check	123
Hard Disk Drive and Controller Check	124
Seek check	125
Error detection and correction check	126
Read, verify check	126
Run all above checks	127
Exiting System Diagnostics	127
Error Codes and Messages	128
APPENDIX E-EQUITY LT SPECIFICATIONS	130
CPU and Memory	130
Controllers	130
Interfaces	130
Power Supply	131
Mass Storage	131
Keyboard	131
Environmental Requirements	131
Physical Characteristics	132
Power Requirements	132
Options	132
GLOSSARY	133
INDEX	142