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Troubleshooting
General System Problems
This section describes problems you may encounter with systems that do not produce POD
error messages. A series of possible solutions is provided for each type of problem in two
formats: a flowchart and a stepby-step text description.
Note Retry the system after you have performed the suggested solution. Only go on to the
next step when the suggested solution fails.
For certain problems, a hardware test is available as one of the options of the System
Diagnostics. You can find the System Diagnostics program on the Reference diskette; user
instructions are in the User’s Guide and a summary can be found in Appendix B of this
manual.
Power or Lock-up Problems
If there is a problem with the computer’s power or the system locks up, see the suggestions
below:
Epson
NX Service
Manual
2-7
- Service Manual 1
- Copyright Information 2
- Trademark Information 2
- Epson NX Service Manual iii 3
- Canadiennes 4
- Other Agency Approvals 4
- About this Manual 5
- System Overview 8
- General Features 9
- Front Panel 10
- Rear Panel 11
- Upgrades 12
- Document Sources 13
- Environmental Specifications 14
- Subassembly Descriptions 15
- System Board 16
- Connectors and Jumpers 18
- Power Supply 20
- Table 1-12 21
- Power Supply Specifications 21
- Epson NX Service 21
- System Description 22
- CMOS RAM 23
- Memory Expansion 24
- Mass Storage 25
- Table 1-16 26
- Table 1-18 26
- Table 1-19 28
- Keyboard 29
- 2 Troubleshooting 30
- General Information 32
- Table 2-2 33
- Power-On Diagnostics and 35
- Error Beep Codes 37
- General System Problems 38
- Computer Doesn’t Start 39
- Blank Screen 39
- Power Supply Shut Down 39
- Keyboard Problems 40
- Video Problems 41
- Incorrect Images 42
- Diskette Drive Problems 43
- Hard Disk Problems 44
- System Software Problems 45
- Parallel Printer Problems 46
- Serial Port Problems 47
- Option Card Problems 48
- Memory Module Problems 49
- Mouse Problems 50
- Removing and Replacing 52
- Subassemblies 52
- General Service Information 54
- System Unit 55
- Replacing the Cover 57
- Removing an Option Card 58
- Installing an Option Card 60
- Removing SlMMs 62
- Installing SlMMs 63
- Installing Another Processor 64
- Removing 66
- Replacing Subassemblies 66
- 3-14 Epson NX Service Manual 67
- 3-16 Epson 69
- NXService Manual 69
- Removing the Power Supply 70
- Reinstalling the Power Supply 71
- Removing the Speaker 72
- Replacing the Speaker 72
- Removing the LEDs 73
- Replacing the LEDs 73
- Removing the BIOS EPROMs 74
- Replacing the BIOS EPROMs 74
- Removing the System Board 75
- Replacing the System Board 76
- Removing the Front Bezel 76
- Replacing the Front Bezel 77
- Reference Materials 78
- System l/O Address Map 82
- DMA Assignments 84
- Hardware Interrupts 85
- Connector Pin Assignments 86
- Speaker Connector 87
- Serial Port Connectors 87
- Parallel Port Connector 88
- Diskette Drive Data Connector 90
- Keyboard and Mouse Connectors 91
- Battery Connector 92
- Reset Connector 92
- Power Supply Connectors 93
- Table A-12 94
- HDD Access LED Connector 95
- Power (SPEED) LED Connector 95
- VGA Feature Connector 96
- Option Slot Connectors 97
- Drive Power Connectors 98
- Intel Ether Express 16C 98
- AHA-1504B 100
- Table A-21 101
- Adaptec Jumper Settings 101
- List of Abbreviations 103
- Reference Materials 104
- NX Service 104
- Manual A-25 104
- System Utilities 105
- Epson NX Service Manual 106
- Running the SETUP Program 107
- The SETUP Screens 108
- Selecting Options 109
- Setting the Date and Time 110
- Setting the Fast Boot Option 113
- Setting the Keyboard Options 114
- Installed Equipment 114
- Setting the Parallel Port 115
- Setting the Serial Port 115
- Setting the Speaker 115
- Setting the Password security 116
- Installed Diskette Drive(s) 117
- Installed Hard Disk Drive(s) 117
- Hard Disk Drive Types 117
- Defining Your Own Drive Type 118
- Setting the Non-cache Areas 119
- Saving Your Settings 120
- Performing System Diagnostics 121
- A: prompt 122
- Deleting Tests 123
- Adding Tests 124
- Running Tests 125
- Resuming From an Error 126
- System Diagnostics Tests 127
- Error Messages 128
- HDFMTALL and press Enter 130
- Option 1, Format 132
- Fotmatting the Disk 134
- Exiting the Program 136
- Additional Utilities 137
- Schematics 138
- Circuitry 139
- Manual C-3 139
- Video Circuitry ( Part 1 ) 140
- Epson NX Sevice Manual 140
- Circuitry 142
- NX Service Manual 146
- Connector 147
- Processor 153
- Connector (CN12) 153
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