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154
DMA Assignments
Epson
NX
Service
Manual
A-5
1
2
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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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