Epson NX User Manual

EPSON

Service Manual

Printed on Recycled Paper.

Revision Level

All rights reserved. No portion of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electric, mechanical, photocopying, recording, or otherwise, without the written permission of Epson America, Inc. No patent liability is assumed with respect to use of the information contained herein. Nor is any liability assumed for damages resulting from the use of the information contained herein.

Trademark Information

EPSON is a registered trademark of Seiko Epson Corporation.

Other product names used in this manual are for identification purposes only and may be

trademarks of their respective companies.

Epson NX Service Manual

FCC Comdiance Statement for American Users

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Subpart B of Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in

a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the

equipment off and on, the user is encouraged to try to correct the interference by one or more

of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.

a Consult the dealer or an experienced radio/TV technician for help.

The user may find the following booklet, prepared by the Federal Communications Commission, helpful: How to Identify and Resolve Radio-TV Interference Problems. This booklet is available from the U.S. Government Printing Office, Washington, D.C., 20402, Stock No. 044-000-00345-4.

You can determine whether your computer is causing interference by turning it off. If the interference stops, it was probably caused by the computer or its peripheral devices. To further isolate the problem, disconnect either the peripheral device or its I/O cable.

These devices usually require a shielded cable. For Epson peripheral &vices, you can obtain the proper shielded cable from your dealer. For non-Epson devices, contact the manufacturer or dealer for assistance.

Warning

This equipment has been certified to comply with the limits for a Class B computing device, pursuant to Subpart B of Part 15 of the FCC Rules. Only peripherals (computer input/output devices, terminals, printers, etc.) certified to comply with the Class B limits may be attached to this computer. Operation with non-certified peripherals is likely to result in interference to radio and TV reception. The connection of a non-shielded equipment interface cable to this equipment will invalidate the FCC Certification of this device and may cause interference levels which exceed the limits established by the FCC for this equipment.

Changes or modifications not expressly approved by the manufacturer could void the user’s authority to operate the computer.

Epson NX Service Manual iii

FCC Compliance Statement for American Users

DOC Compliance Statement for Canadian Users

This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the radio interference regulations of the Canadian Department of Communications.

Conformation á les normes d’émission radioélectriques

Canadiennes

Le présent appareil numérique n’ émet pas de bruits radioélectriques dépassant les limites

applicables aux appareils numériques de la classe B prescrites dans le règlement sur le

brouillage radioélectrique édicté par le Ministère des Communications du Canada.

Other Agency Approvals

Application for approval of this equipment has been made to the following agencies:

United

States:

UL,

FCC Class

Canada:

Europe:

CSA, DOC VDE

Class

B, CISPR

Class

B, TUV, NEMKO, SEMKO, SETI

Epson

Service Manual

About this Manual

This manual is designed to be used with the Epson NX system. Chapter 1,

System Description,

includes the overall system specifications, subassembly

descriptions, and the locations of all major components.

Chapter 2, Troubleshooting, describes the steps you need to take to troubleshoot and service

the computer.

Chapter 3,

Removing and Replacing Subassemblies,

describes the disassembly and assembly

of the computer to its replaceable components.

Appendix A, Reference

Materials,

provides supplemental information that you may need

when servicing the computer. Appendix B,

System Utilities,

provides a summary of the SETUP program, the System

Diagnostics, and other utilities on the Reference diskette. Appendix C,

Schematics, provides

a series of system schematics.

A detailed Contents is provided at the beginning of each Chapter and Appendix. A complete list of Tables and Figures is

also

provided in the

Contents.

A comprehensive Index is provided at the back of the manual.

Epson

NX Service

Manual

System Description

Contents

System Description

System Overview.

GeneralFeatures

FrontPanel RearPanel

Options

Upgrades Document Sources Emissions and Safety Agency Information Environmental Specifications

Subassembly Descriptions

Case

SystemBoard Connectors and Jumpers

Power Supply.. Memory.

Mass Storage

Keyboard

.........................................................

........................................................

............................................................

Connectors Jumpers

.......................................................

Standard Memory. BIOS ROM CMOS RAM Video DRAM Memory Expansion.

Diskette Drive and Tape Drive Options. Hard Disk Drive Options..

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1- 1 l-2 1-3 l-4 l-5

l-5 l-6

l-6 l-7

l-8 l-9

1-9 l-11 l-11 1-12 1-13 1-15 1-16 1-16

1-16 1-16 1-17

1-18

l-22

Epson NX Service Manual

1-i

Figures

Figure l-l

Figure l-2 Figure l-3 Figure l-4 Figure l-5

Figure l-6 Figure l-7 Figure l-8 Power Supply Cable Layout Figure l-9 System Memory Map Figure l-10 Jumper Placement for HDDs. Figure 1 - 11

System Overview. FrontView Rearview CPU Upgrade Path System Level Assemblies

System Board Components.

Power Supply

101-Key Enhanced Keyboard.

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Tables

Table 1- 1 Table l-2

Table l-3 Table l-4 Table l-5 Table l-6 Table l-7 Table l-8 Table l-9 Table l-10 Table l-11 System Board Jumper Settings (J9-J15).

Table 1-12 Table 1-13 Table 1-14 Table 1-15 Table 1-16 Table 1-17 Table l-18 Quantum LPS525S 525MB SCSI HDD Specifications. Table 1-19 Table l-20

Physical Description. Front Panel Features Rear Panel Features.

Emissions and Safety Agency Data Environmental Specifications Case Specifications

System Board Component Functions System Board Connectors System Board Jumper Settings (Jl-J4). System Board Jumper Settings (J5-J8).

Power Supply Specifications Memory Configuration Diskette and Tape Drive Options Hard Disk Configurations.

Conner CP30174E 170MB IDE HDD Specifications Quantum LPS240AT 240MB IDE HDD Specifications

Quantum LPS525S Jumper Settings. Keyboard Specifications.

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1- 1 l-3 l-4 l-5

l-8 l-10 1-13 l- 14 1-15 l-20 l-22

l-2 l-3

l-6 l-7 l-9

l-9 1-12 1-12 1-12 1-12 1- 14

l- 17 l- 18 l- 18 1-19 l- 19 1-19 1-21 l-22

1-ii

Epson NX Service Manual

System Description

System Overview

The Epson NX desktop computer is an advanced, high-performance desktop system fully compatible with Industry Standard Architecture (ISA) at the hardware and software level. This computer has the capacity for installation of up to three storage devices and addition of four option cards. The system comes standard with a 3½-inch, 1.44MB diskette drive. There

are four configurations, giving you a choice of no hard disk drive, a 170MB IDE, a 240MB

IDE, or a 525MB SCSI hard disk drive. Systems with hard drives come with the

NeXTSTEPTM operating system preinstalled A 16-bit Ethernet adapter card also is installed.

Figure l-l shows the main system unit and components that are packaged with the product

(monitor not included; the configuration without a hard drive does not include software).

Figure l-l System Overview

Epson NX Service Manual

1-1

System Overview

General Features

The following features are standard:

Intel i486DX2/66 CPU PGA CPU-type ZIF socket that can also contain a future OverDrive processor

8KB CPU Cache and Epson VirtualCacheTM (secondary)

C&T WingineTM 64200 video display driver

Diskette drive (3%inch)

0 cl

A choice of no hard drive, a 170MB Conner IDE hard disk drive, a 24OMB Quantum IDE hard disk drive, or a 525MB Quantum SCSI hard disk drive

20MB of on-board memory in the 170MB or 240MB HDD configurations or

36MB of on-board memory in the 525MB HDD configuration; expandable with

SIMMs to 128MB

2MB of on-hoard video DRAM Texas Instruments RAMDAC

A 16-bit Ethernet adapter (either an Intel EtherExpressTM16C or an SMC EtherCard PLUS Elite16 Combo)

Selectable shadow RAM for system BIOS and video BIOS

Two RS-232C serial ports and a Centronics standard bidirectional parallel port

PS/2compatible mouse and keyboard ports

Built-in VGA video port

Four full-length, horizontal, 16-bit, ISA option slots (three available)

cl cl

Keyboard with mini-DIN type connector

100-240 VAC worldwide power supply with switch-selectable input; 145 watts.

Table 1-l describes the overall physical dimensions of the system.

Table l-l

Physical Description

1-2

Epson NX Service Manual

System Description

Front Panel

Figure l-2 shows the features on the front panel of the system. Table l-2 describes the front

panel features.

Figure 1-2 Front View

Table 1-2

Front Panel Features

Epson NX Service Manual

1-3

System Overview

Rear Panel

Figure l-3 shows the features on the rear panel of the system. Table 1-3 describes the rear panel features.

Figure 1-3 Rear View

l-4

Epson NX service Manual

Options

In addition to the standard configurations, the following are available:

System Description

cl ci cl

An optional 3½-inch or 5¼-inch diskette drive 3½-inch 8OMB, 12OMB, or 240MB IDE hard disk drives

1, 4, 16, or 64MB (when available), 36-bit, 70-ns SIMM option kits

VGA, Super VGA, and multi-frequency color monitors

Epson 25OMB tape backup drive

Media Vision Spectrum

Labtec CSS-550 speaker option kit.

16 multimedia sound card

Upgrades

Figure l-4 shows the possible CPU upgrade paths for the standard system configurations.

You can find instructions for removing and replacing CPUs in Chapter 3.

Figure 1-4 CPU Upgrade Path

Epson NX Service Manual

1-5

System Overview

Document Sources

Emissions and Safety Agency Information

The Epson NX in a typical configuration meets or exceeds the requirements of the emissions and safety agencies listed in Table l-4.

Table 1-4

Emissions and Safety Agency Data

l-6

Epson NX Service Manual

Environmental Specifications

Table l-5 lists the. environmental specifications for the Epson NX.

Table l-5

Environmental Specifications

System Description

Epson NX Service Manual

1-7

Subassembly Descriptions

This section gives descriptions and specifications for the following subassemblies:

Case

System board along with connectors and jumpers

Power supply

Memory

Disk drives

ci 0

Keyboard.

Figure l-5 shows the major subassemblies of the computer.

1-8

Figure 1-5 System Level Assemblies

Epson NX Service Manual

System Description

Case

The multi-piece case unit is shown in Figure l-5 and described in Table 1-6, below.

Table 1-6

Case Specifications

System Board

Figure l-6 shows the major components on the main system board. The functions of these components are described in Table l-7.

Table 1-7

System Board Component Functions

Epson NX Service Manual

1-9

Subassembly Descriptions

1-10

Figure l-6 System Board Components

Epson NX Service Manual

System Description

Connectors and Jumpers

This section describes the connectors and jumpers on the main system board. The location of

each connector and jumper block is shown in Figure l-6.

Connectors

Table l-8 lists the connectors on the main system board. You can find a description of all connector pin assignments in Appendix A.

Table 13

System Board Connectors

Epson NX Service Manual

1-71

Subassembly Descriptions

Jumpers

The location of each jumper is shown in Figure l-6. A jumper’s setting is determined by

where the jumper is placed on a set of pins. The jumper connects either pin A and the middle pin or pin B and the middle pin. The jumper settings are defined in Table 1-9, Table l-10, and Table l-11.

Table 1-9

System Board Jumper Settings (51-54)

Table l-10

System Board Jumper Settings (JS-J8)

Table l-11

System Board Jumper Settings (J9-515)

1-12

Epson NX Service Manual

System Description

Power Supply

The computer has a 145-watt power supply with switch-selectable AC input voltage. The power supply is a totally self-contained module that connects PS1 and PS2 to the main circuit board via a 12 pin connector (CN13). In addition to the normal power supply circuitry, the

module also includes the following components:

Power on/off switch

D cl

115/23OV input select switch AC input connector for detachable power cord Cooling fan.

All minimum load requirements for the power supply are met by the standard configuration

of the main circuit board.

To prevent damage from excessive temperature inside the computer, the power supply includes sensors and a detection circuit that shuts down the power supply when an excessive operating temperature is detected. To restart the computer, you must identify and correct the problem that caused the system to overheat (such as a blocked fan), turn off the power

switch, wait at least thirty seconds, and turn the power back on.

The power supply is shown in Figure l-7. Specifications are given in Table 1-12.

Power-on/off switch

Fan

Voltage

switch /

Power inlet

Figure 1-7 Power Supply

Epson NX Service Manual

1-13

Subassembly Descriptions

Table 1-12

Power Supply Specifications

Figure l-8 shows the power supply cable layout and connectors.

1-14

Epson NX Service

Manual

System Description

Memory

The 170MB and 240MB HDD configurations for this system have 4MB of memory soldered on the system board and one 16MB SIMM installed, for 20MB total memory. The 525MB HDD configuration has 4MB of memory soldered on the system board and two 16MB SIMMs installed, for 36MB total memory. The DRAM on the system board consists of eight high-performance 512KB, 70-ns chips. The system supports 1, 4, 16, or 64MB (when

available), 70-ns SIMMs; two SIMMs may be installed for a maximum of 128MB Memory

is controlled by a custom ASIC designed by Epson that permits burst cycles from standard

DRAM. The system memory has the following features:

Standard memory includes cache and shadow RAM

ROM BIOS and CMOS RAM

Video DRAM

Zero wait state memory access

32-bit data access

LIM 4.0 EMS compatiblity.

Figure l-9 shows the system memory map.

Epson NX Sevice Manual

1-15

Subassembly Descriptions

Shadow RAM

128KB of the remaining first 1MB of DRAM is used to shadow the system BIOS and VGA

BIOS. Shadow RAM is address selectable through SETUP.

Cache Memory

8KB of internal cache is built into the microprocessor. Cache address control is selectable through SETUP and testing is available through the system diagnostics.

The system also supports a new feature designed by Epson called VirtualCache. VitualCache is a dynamic DRAM memory cache that functions like cache SRAM. VirtualCache utilizes the burst-mode capabilities of the 486 CPU to minimize memory access time. In addition, look-ahead circuitry attempts to predict where the next memory access will be, and access that region before the CPU needs it.

BIOS ROM

The system uses a BIOS that conforms to the ISA IEEE specifications. The BIOS supports all applications that run on PC XT/AT systems and supports all ISA option cards.

The system board contains a 128KB EPROM in Ul for the system and video BIOS plus the code for the SETUP utility. The 64KB EPROM in U113 contains the Nanguage text messages for SETUP

The current BIOS version is shown during system start up. Installing a new version of the BIOS requires replacement of the EPROMs in Ul and U113. See Chapter 3 for details.

CMOS RAM

The CMOS RAM is contained within the 82C206 and power is provided via the lithium backup battery. The CMOS memory supports the standard 64 bytes of battery-backed RAM:

14 bytes for clock and control registers and 50 bytes of general purpose data. All CMOS RAM is reserved for BIOS use and can be set to specific values or cleared to system default values using the SETUP program.

Video DRAM

The system comes with 2MB of video DRAM consisting of eight 256KB chips soldered onto the main system board in sockets U84-U87 and U92-U95.

1-16

Epson NX Service Manual

System Description

Memory Expansion

The system board has two SIMM sockets, SIMM1 and SIMM2. The SIMMs that you install should be single- or double-sided 70-ns, 36-bit fast-page-mode SIMMs with gold connectors. Table 1-13 shows the possible memory expansion configurations.

Table 1-13

Memory Configuration

SIMM positions can be reversed to achieve same total

memory.

20MB of RAM is

configurations;

HDD

configuration.

The standard

both SIMM sockets are populated with

standard

36MB of

4 MB of

for 170MB

RAM is standard for the

and

240MB HDD

525MB

memory is not accessible when

64MB SIMMs.

Epson

NX service

Manual

1-17

Subassembly

Descriptions

Mass Storage

The system can support up to three mass storage devices. A hard disk drive can be installed in the horizontal drive bays or outside tape drives can be installed in the horizontal drive bays.

Diskette Drive and Tape Drive Options

The on-board diskette controller directly supports two diskette drives of any of the following: 3½&inch, 72OKB or 1.44MB and 5¼-inch 360KB or 1.2MB drives. The controller can also support one tape drive.

The standard diskette drive is a Mitsumi D-359T3 drive. Optional diskette drives can be

selected from Table 1-14.

Diskette and Tape Drive Options

the drive

Table 1-14

bay on

the

right side. Diskette,

CD-ROM, cx

Hard Disk Drive Options

There are three optional hard disk drive configurations available from the factory: a Conner CP30174E 170MB drive, a Quantum LPS240AT 240MB drive, or a Quantum LPS525S 525MB drive.

Table l-15

Hard Disk Configurations

1-18

Epson NX Service Manual

Specifications for the Conner CP30174E HDD

Table 1-16

System Description

Specifications for the Quantum LPS525S HDD

Table 1-18

Quantum LPS525S 52SMB SCSI HDD Specifications

Epson

NX Service

Manual

1-19

Subassembly Descriptions

Conner CP-30174E

17O MB

IDE

HDD

Master =

Slave

Quantum LPS240AT

24OMB

Master = DS jumpered

Slave

(or if

for

master grounded and

pin 28 is not grounded)

C/D

jumpered

= C/D

not

jumpered

IDE

HDD

= not jumpered

drive is

configured

cab/e

selection

jumper, the drive is a

drive if

using the

28 is

a slave

Quantum LPS525S

525MB SCSI HDD

See

Table 1-19 for jumper

settings.

1-20

Epson

Service Manual

Figure l-10. Jumper Placement for HDDs

Table 1-19

Quantum LPS525S Jumper Settings

bus (to be used when drive is

System Description

Factory default jumper setting

Epson

Service Manual

1-21

Subassembly Descriptions

Keyboard

The system includes a detached keyboard that connects to the computer through a coiled cable. Adjustable legs allow you to use the keyboard at two different heights. Figure l-11 shows the l0l-key keyboard. A 102-key model is also available. Table l-20 provides the

specifications for the l0l-key keyboard.

Figure l-11 l0l-Key Enhanced Keyboard

Table l-20

Keyboard Specifications

1-22

Epson

Service Manual

2 Troubleshooting

Contents

Troubleshooting

General Information................................................

Recommended Service Tools Epson Authorized Replacement Modules.

Power-On Diagnostics and Boot Errors.

Error Beep Codes General System Problems

Power or Lock-up Problems.

Computer Doesn’t Start

BlankScreen ...................................................

Power Supply Shut Down

Keyboard Problems.

No Keyboard Response Sticking Keys

Video Problems ..................................................

Blank Screen ..................................................

Incorrect Images ...............................................

Diskette Drive Problems.

Operating System Error Messages Diskette Drive Noise.

Hard Disk Problems

Newly-installed Drive Problems. Hard Disk Boot Failure

System Software Problems. Parallel Printer Problems

Serial Port Problems ..............................................

Option Card Problems Memory Module Problems. Mouse Problems. Troubleshooting with the NeXTSTEP Operating System

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2-l

2-l 2-2

2-3 2-6

2-7

2-7 2-8 2-8

2-8 2-9

2-9 2-10 2-10 2-11 2-11 2-12 2-12

2- 12 2-13 2- 13 2-14 2-14 2-15 2-16

2-17 2- 18 2-19 2-20

Figures

Figure 2-l Power or Lock-up Problems Figure 2-2 Keyboard Problems.

Figure 2-3 Figure 2-4 Diskette Drive Problems. Figure 2-5 Hard Disk Problems Figure 2-6 Software Problems Figure 2-7 Parallel Printer Problems Figure 2-8 Serial Port Problems Figure 2-9 Option Card Problems. Figure 2- 10 Figure 2-11

Video Problems.

Memory Module Problems Mouse Problems

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Epson NX Service Manual

2-7

2-9 2-10 2-12 2- 13 2-14 2-15 2-16 2-17 2- 18 2-19

2-i

Tables

Table 2-l Recommended Service Tools Table 2-2 Table 2-3 Table 2-4

Authorized Replacement Modules Power-on Diagnostic Error Messages Error Beep Codes

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2-l 2-2 2-3 2-6

2-ii

Epson NX Service Manual

General Information

This chapter describes the various procedures you can follow to diagnose problems with the system. The diagnostics are broken down into three sections:

0 cl

Power-on diagnostics

Error tone codes

and boot errors

General system problems.

Recommended Service Tools

The recommended service tools are listed in Table 2-1. All tools are commercially available.

Table 2-1

Recommended Service Tools

Epson

NX Service

Manual

2-l

Epson Authorized Replacement Modules

Table 2-2 lists the authorized replacement modules for the Epson NX. The reference letter assigned to each module is used in this chapter to indicate when you should replace that module and test the system again.

Table 2-2

Authorized Replacement Modules

2-2

Epson

Rep aut

U.S. should malfunction of any of the components marked with an asterisk.

NX Service

lacement of

orized

Manual

service centers outside the U.S. Servicers

replace

these components is performed only by

the system board when there is a

the

Power-On Diagnostics and Boot Errors

The computer’s ROM BIOS contains a series of diagnostic programs, called Rower-On Diagnostics (ROD). These programs check internal devices, such as ROM, RAM, the timer, the keyboard controller, and the hard disk drive every time you turn on the computer or reset the system.

When the POD tests detect an error, the computer displays a message on the screen as described below. In some instances, the computer may also sound a beep. This happens when the error occurs before the computer initializes the video display. If the error is serious, the

computer cancels further checking and halts system initialization. The error message remains on the screen and the computer locks up.

Table 2-3 provides a list of the error messages that may appear. The solutions that are provided must be followed in order. If more than one replacement module is specified, replace them in order, one at a time.

Table 2-3

Power-on Diagnostic Error Messages

Epson NX Service Manual

2-3

Power-On Diagnostics and

Boot

Errors

2-4

Epson NX Service Manual

Replacement of these components is performed only by authorized service centers outside the U.S. Servicers in the U.S. of any of the components marked with an asterisk.

should

replace the system board when there is a malfunction

Epson NX

Service Manual 2-5

Error

Beep Codes

Error Beep Codes

If the POD detects an error but cannot display an error message, the computer sounds an error tone code. The tone code is a distinct pattern of beeps that identifies the error, such as

one long beep and two short beeps. If there are no errors, the system beeps once before it loads the operating system.

Table 2-4 lists the error beep codes.

Table 2-4

Error Beep Codes

Replacement of these components is performed on centers outside the U.S. board when there is a malfunction of any of the components marked with an asterisk.

Servicers in the U.S.

should

by authorized service

replace the system

2-6

Epson

NX Service

Manual

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

General System Problems

Computer Doesn’t Start

If the Rower LED is on, see “Video Problems” on page 2-10. If the Rower LED is off, turn off the power and check the following:

Be sure all cables are securely connected to the computer. Check that the computer and monitor power cords are plugged completely into their

electrical outlets. Test the outlet to see if it supplies power. Remove the Rower cord from the electrical wall outlet and from the rear of the power

supply module. Remove the Rower supply and test the continuity of the 4A fuse inside the module

with a multimeter. Replace the fuse if necessary.

Replace the power supply.

Blank Screen

See “Blank Screen” on page 2-l 1.

Power Supply Shut Down

The Power supply contains detection circuits that automatically shut down the power if they detect excessive operating temperatures. This protects the system from damage due to overheating.

When these circuits detect a high temperature, they shut off all the DC outputs in the power supply and the computer stops operating. This does not damage the power supply, but you must remove the cause of the high temperature before the system can be used again.

After you eliminate the problem causing the overheating, allow the computer to cool down for at least five minutes at a room temperature of about 25° C (78° F). This resets the thermal detection circuits.

To determine the cause of the high temperature and correct the condition, check for the following:

A blocked power supply fan. Make sure that nothing blocks the power supply fan vents. Check both inside and outside the computer for blockage. Make sure there is

ample room around the system for air circulation.

Room temperatures of 40° C (104° F) or above. If this is the case, move the computer

to a cooler area.

An overload of the power supply limitations. Check the information on page 1-14 to see if the power limits have been observed.

2-a

Epson

If the power supply shuts off again after you follow the steps above to correct the problem, replace the Rower supply module.

NX Service Manual

Troubleshooting

Keyboard Problems

If there is a problem with the computer’s keyboard, see the suggestions below:

Figure 2-2

Keyboard Problems

No Keyboard Response

If the computer boots properly but does not respond when you type, follow these suggestions:

Make sure the keyboard cable is securely connected to the keyboard port and not the mouse port.

Check the keyboard cable connector for any bent or missing pins. If necessary, repair the connector or replace the cable.

Replace the keyboard unit. The internal circuit board may be faulty.

Replace the keyboard controller. The controller may be faulty.

Check the continuity of fuse Fl (1A @ 125V) on the system board and replace it if blown.

Replace the system board.

Epson

Service Manual

Genera/ System

Problems

Sticking Keys

When the keys are sticking, follow these suggestions:

Make sure the keyboard’s upper and lower cases are properly aligned.

Remove the sticking keys and clean all internal parts.

Remove the keys and replace any broken parts.

Video Problems

If there is a problem with the computer’s video system, see the suggestions below:

2-10

Figure 2-3 Video Problems

Epson NX Service Manual

Blank Screen

If the power LED is on but the screen is blank, follow these suggestions:

Make sure the monitor cables are securely connected to the monitor, the computer, and the electrical outlet.

Check that the monitor’s power switch is on and that the power light on the monitor is

lit. If the Rower light is not lit, check to see if the electrical outlet supplies power. If the power light is on but you still do not see anything on the screen, check the

monitor’s brightness and contrast controls. Check the monitor cable connector for any bent or missing pins. If necessary, repair

the connector or replace the cable. If the monitor is connected to the built-in video adapter, make sure that jumper Jl0

has a jumper in position A. (See page 1-12.) If the monitor is connected to an optional video adapter, make sure that jumper Jl0 has a jumper in position B. If the optional video adapter is monochrome, make sure that jumper Jll is in position B.

Replace the monitor.

Troubleshooting

Replace the system board. The video controller may be faulty. Authorized service centers outside the U.S. can replace the video controller chip.

Incorrect Images

If the screen displays incorrect or blurred images, follow these suggestions:

Make sure the monitor cables are securely connected to the monitor, the computer, and the electrical outlet.

Check the monitor’s brightness and contrast controls. See the manufacturer’s guide for references to other controls that may affect picture quality.

Make sure the monitor and video adapter types match.

Make sure the correct display adapter type is selected in the SETUP program.

If an extended VGA driver is installed in memory, make sure the specified resolution is supported by the monitor.

Test the video adapter by running the video diagnostics tests. If the tests indicate an error, replace the system board. The video controller may be faulty. Authorized

service centers outside the U.S. can replace the video controller chip.

Epson

Service Manual

2-11

General System

Problems

Diskette Drive Problems

If there is a problem with the diskette drive, see the suggestions below:

Figure 24

Diskette Drive Problems

Operating System Error Messages

If the system boots, but the operating system displays a diskette access error message, follow these suggestions:

Run the SETUP program and make sure the diskette drive type is set correctly and the diskette drive controller is enabled.

Remove the computer cover and make sure the diskette drive interface and power connectors are completely inserted. Replace the cover.

Test the drive by running the diskette drive diagnostics test. If the test indicates an

error, replace the diskette drive.

4 Replace the system board. The FDD controller in the 82C711 gate array may be

faulty. Authorized service centers outside the U.S. can replace the gate array chip.

Diskette Drive Noise

lf the diskette drive is making loud or unusual noises, check for any loose parts and replace

the diskette drive if necessary.

2-12

Epson

Service Manual

Hard Disk Problems

If there is a problem with the hard disk drive, see the suggestions below:

Troubleshooting

Figure 2-5 Hard Disk Problems

Newly-installed Drive Problems

If there is a problem with a newly installed drive, follow these suggestions:

Verify that you ran the SETUP program to enable the built-in hard disk controller and have defined the hard disk drive type correctly.

Check all the cable connections to make sure you installed the drive correctly. (See page 3-16.) Also, check the jumper settings on the drive to be sure they are set correctly.

Note

Lf you installed a non-Epson hard disk drive, verify that it has a DOS partition. (The hard disk drives Epson provides with the Epson NX have a DOS partition as well as a partition for NeXTSTEP software.) You can check for a DOS partition by booting with a DOS system diskette and running the FDISK program. If FDISK reports that no partition exists, then it means that DOS has not been installed.

If the hard disk is not an IDE-type drive, it may need to be physically formatted. Follow the instructions in the

User’s

Guide for the HDD format program on the

Reference diskette.

Test the drive by running the hard disk diagnostics tests. If the tests indicate a problem, replace the drive.

Epson

Service Manual

2-13

General System Problems

Hard Disk Boot Failure

When the computer starts but does not load the operating system, follow these suggestions:

Run the SETUP program and make sure the hard disk drive type is correct.

Boot the system from a DOS system diskette in drive A. Then enter the command

DIR

. (The drives Epson provides for the Epson NX have a partition for DOS as

well as a partition for the NeXTSTEP operating system.) If you see a message similar

to Invalid device sgecification,go

If you see a valid directory listing, run the DOS FDISK program and make sure the primary partition is set as the active partition.

to step 4.

Reformat the hard disk and reinstall the operating system on it. (See “Hard Disk Problems” on page 2- 13 .)

If the hard disk is not an IDE-type, perform a low-level format on the HDD with the

Hard Disk Format program on the Reference diskette. (See the User’s Guide for instructions.) Reformat the hard disk and reinstall the operating system on it.

System Software Problems

If there is a problem using the built-in system software, follow the suggestions below:

Make sure you are using the correct procedure for starting the program.

Check your Service Information Bulletins for System BIOS updates. Install the most recent version of the BIOS in Ul.

If you are unable to run the SETUP program, replace the System BIOS chip in Ul and the SETUP text chip in U113 (see page 3-21).

Replace the system board.

2-14 Epson

Service Manual

Figure 2-6 Software Problems

Troubleshooting

Parallel Printer Problems

If there is a problem using a printer from the parallel port, follow the suggestions below:

Figure 2-7 Parallel Printer Problems

Make sure the printer has power and is properly connected to the computer. (Also, be sure the printer has paper in it.)

Check the printer manual for the printer’s correct DIP switch or control panel settings. Try a different cable. Also, try a different printer if one is available. If there is more than one parallel port, check the primary and secondary port settings

in the SETUP program to make sure they are correct. Run the parallel port diagnostics test. Replace the system board. Connector CN5 or the parallel port controller in the

F82C711 gate array may be faulty. Authorized service centers outside the U.S. can replace the gate array chip or connector.

Epson

Service Manual

2-15

General System

Problems

Serial Port Problems

If there is a problem using a serial device from a serial port, follow the suggestions below:

Figure 2-8 Serial Port Problems

Make sure the device has power and is properly connected to the computer. Check the device’s manual for any DIP switch or control panel settings. The baud

rate, parity, and number of stop bits of the device and serial port must match. Try a different cable. Also, make sure you are using a null modem cable if the device

is a serial printer. Check the primary and secondary port settings in the SETUP program to make sure

they are correct. Run the Serial port Diagnostics test. Replace the system board. Connectors CN4 and CN8 or the serial port controller in the

F82C711 gate array may be faulty. Authorized service centers outside the U.S. can replace the gate array chip or connector.

2-16

Epson

NX Service

Manual

Option Card Problems

If there is a problem using an option card, follow the suggestions below:

Troubleshooting

Figure 2-9

Option Card Problems

Make sure the option card is properly inserted in its slot. Check to see if any necessary DIP switches or jumpers on the option card are set

correctly.

Make sure that you used the proper cable to connect the device to the option card

connector.

Switch the system to low speed. If you still have trouble with the option card and the system is using a memory

manager program such as QEMM-386TM or 386MAXTM, try removing the program from memory and rebooting your computer.

Some cards may use a part of the memory address space that conflicts with the addresses assigned to Video Shadow RAM. Use the SETUP program to disable the Video Shadow RAM.

Replace the option card.

Epson

NX Service

Manual

2-17

General System

Problems

Memory Module Problems

If there is a problem using a SIMM, follow the suggestions below:

Figure 2-10 Memory Module Problems

If the memory count displayed by the POD or the SETUP program is incorrect, the SIMMs may not be installed correctly. The SIMMs may be the wrong type, or they may not be inserted all the way into their sockets. Remove the cover and check the installation.

Verify the speed of the SIMMs. Install only 70-ns (or faster), 36-bit, gold-plated, fast-page mode SIMMs.

Run the SETUP program to check the memory configuration. 4 5 6

Run the memory diagnostics test.

Replace the SIMMs one at a time.

Replace the system board. The SIMM connectors or memory controller in the EP6075

gate array may be faulty. Authorized service centers can replace the gate array chip or

Connector.

2-18

Epson

NX Service

Manual

Troubleshooting

Mouse Problems

When the computer boots properly but does not respond when you move the mouse, follow the suggestions below:

Figure 211 Mouse Problems

Make sure the mouse cable is securely connected to the mouse port (CN9) and not to the keyboard port (CNl0).

Check whether the mouse driver program is loaded into the computer’s memory correctly.

Check the mouse cable connector for any bent or missing pins. Check that the built-in mouse port jumper J9 is in position A. Replace the mouse. It may be faulty. For servicers outside the U.S., replace the keyboard/mouse controller. The controller

may be faulty.

Check the continuity of fuse Fl (1 A @ 125V) on the system board. Replace the fuse if it is blown.

Replace the system board.

Epson

NX Service

Manual

2-19

General System Problems

Troubleshooting with the NeXTSTEP Operating System

As has been described previously, you can diagnose hardware problems for the Epson NX system by inserting a DOS boot or diagnostics diskette and running the checks in this chapter. The paragraphs below describe a few features of the NeXTSTEP operating system that may be useful for a service technician to know during troubleshooting.

Like the UNIX operating system, NeXTSTEP needs to be powered down in an orderly manner. If you want to exit NeXTSTEP and power off the system:

Hold down the right

If there is an abnormal system shut down, the NeXTSTEP operating system runs an

extensive check of the hard disk drive to investigate the problem.

Alt

key, press

Num Lock,

and then press h to halt the system.

The screen displays

the message “Checking disks” for several minutes. After successfully running the

system check, NeXTSTEP cleans the file system state (i.e., performs the procedure for an orderly shutdown), and then reboots. The system displays the message “Pile system clean” during initialization of the software.

(In some instances of abnormal shutdown, the site system administrator (SUPERUSER) will be required to intervene and manually clean the file system.)

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Epson

NX Service

Manual

Removing and Replacing Subassemblies

Contents

General Service Information.

System Unit .......................................................

Removing the Cover. Replacing the Cover. Removing an Option Card Removing the Option Slot Cover. Replacing the Option Slot Cover. Installing an Option Card. Removing the Option Card Riser Board Replacing the Option Card Riser Board. Removing SIMMs.

Installing SIMMs.. ..............................................

InstalIing Another Processor. Removing a Drive From the Horizontal Position Installing a Drive In the Horizontal Position. Removing a Hard Disk Drive From the Vertical Position. Installing a Hard Disk Drive In the Vertical Position Removing the Power Supply Reinstalling the Power Supply. Removing the Speaker Replacing the Speaker Removing the LEDs Replacing the LEDs Removing the BIOS EPROMs. Replacing the BIOS EPROMs Removing the System Board Replacing the System Board Removing the Front Bezel Replacing the Front Bezel

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3-3 3-4

3-4 3-6 3-7 3-8 3-8

3-9 3-10 3-10

3-l 1 3-12 3- 13 3-14

3-15

3-17

3-18

3-19

3-20

3-21

3-22 3-22 3-23 3-23 3-24 3-25 3-25 3-26

Epson NX Service Manual 3-i

Figures

Figure 3-l Removing the Cover Retaining Screws Figure 3-2 Figure 3-3 Replacing the Cover. Figure 3-4 Removing/Installing the Option Card Figure 3-5 Removing/Replacing the Option Slot Cover Figure 3-6 Removing the Option Card Riser Board Figure 3-7 Removing SIMMs. Figure 3-8 Removing/Installing the Processor. Figure 3-9 Removing/Installing a Horizontal Drive

Figure 3- 10 Figure 3-11 Figure 3- 12 Figure 3-13 Power Supply Assembly Figure 3-14 Power Supply Power Cables Figure 3- 15 Figure 3-16 Figure 3-17 Figure 3-18

Removing the Cover.

Removing/Installing Drive Panels Attaching Drive Cables. Removing/Installing a Vertical HDD

Speaker and LED Assemblies BIOS Chips Installation Removing/Replacing the System Board. Removing/Replacing the Front Bezel

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3-4

3-5 3-6

3-7

3-8 3-10 3-11 3-13 3-14 3-15 3-16 3-17 3-19 3-20 3-21 3-23 3-24 3-25

3-ii

Epson NX Service Manual

Removing

and

Replacing Subassemblies

General Service Information

This chapter provides instructions for removing and replacing the major subassemblies of the Epson NX. The following precautions must be observed when performing any service procedures.

DANGER

Turn off the computer and all peripheral devices and disconnect all peripheral interface cables from the system unit before removing the system unit cover. Failure to heed this warning could expose you to an electrical shock hazard. Remove the AC power cord only when you need to disassemble the system.

Components on the main system board can get very hot. After turning off the computer, wait for at least 10 minutes for the components to cool before removing the cover.

WARNING

Most of the components used in the manufacture of circuit boards and disk drives in the computer are static-sensitive CMOS devices. To prevent damage from static electricity, always discharge body static by touching a grounded surface before opening the computer’s case. Always wear a grounded wrist strap when handling any circuit boards or cables inside the computer. Do not touch any of the circuit board components or connector pins with your hands, including the gold edge connectors, as damage from static discharge and/or contamination may result. Place circuit boards and disk drives on

anti-static rubber mats or similar anti-static surfaces when they are

removed from the computer. Do not rock, twist, or physically stress the circuit boards while removing

them, as permanent damage may result. Follow all instructions in the order given. Failure to do so may cause

damage to a subassembly or component.

Caution

Do not allow the speaker attached to the front of the system chassis to come in close proximity to diskettes, hard disk drives, or other magnetic media, as the speaker’s magnetic field can cause loss of data.

Epson

NX Service

Manual

3-1

System

Unit

System Unit

This section describes how to remove and replace the components of the main system unit.

Removing the Cover

WARNING

computer every time you remove the cover. If you are not properly grounded, you could generate an electric shock when you touch a component.

Before following these instructions, read the warnings on page 3-l. Follow these steps to remove the computer’s cover:

Turn off the computer and then any peripheral devices (including the monitor and printer).

Disconnect the computer’s power cable from the electrical outlet and from the back panel if you plan to remove a major component. Also, disconnect any cables that are connected to the computer, including the keyboard cable.

If the monitor is on top of the computer, lift it off and set it to one side.

Turn the computer around so you are facing the back panel.

Remove the three retaining screws securing the cover to the back panel, as shown in Figure 3- 1.

Be sure to ground yourself by touching the back panel of the

3-2 Epson

Figure 3-1

NX Service

Removing the Cover Retaining Screws

Manual

Removing

and

Replacing

Subassemblies

6 7

Turn the computer around again so that the front panel is facing you. Grasp the sides of the cover and pull it straight toward you until it stops, just before it

reaches the front of the computer. Then lift it off at an angle as shown in Figure 3-2.

Figure 3-2 Removing the Cover

Set the cover aside on a flat surface.

Epson

Service Manual

3-3

System

Unit

Replacing the Cover

To replace the computer’s cover, follow these steps:

Facing the front of the computer, position the cover so the lips on its bottom edges

slide under the guiderails along both sides of the computer case, as shown in Figure 3-3.

Chassis

Cover

Figure 3-3 Replacing the Cover

Lower the cover and slide it straight back over the computer until it stops against the rear panel.

Replace the three cover retaining screws as shown in Figure 3- 1. Reconnect the computer to the monitor, printer, keyboard, mouse, and any other

peripheral devices. Then reconnect the power cable to the back of the computer and to

an electrical outlet.

3-4

Epson

Service Manual

Removing

and Replacing

Subassemblies

Removing an Option Card

Follow these steps to remove an option card that has been installed in the computer in order to access components on the main system board, to change a jumper setting, or to change option cards:

Remove the computer’s cover as described on page 3-2.

Remove the retaining screw securing the option card to the computer as shown in Figure 3-4. Then pull the card straight out from the riser board.

Figure 3-4 Removing/Installing the Option Card

Set the option card aside with the component side facing up.

Note After removing an option card, check to see if any jumper settings on the main system

board need to be changed. For example, if you remove a mouse interface card, the setting of jumper J12 needs to be changed. If you remove a video card, the settings of

jumper Jl0 or J11 may need to change. See page 1 - 12 for more information on jumper

settings.

Epson NX Service Manual

3-5

System Unit

Removing the Option Slot Cover

Follow these steps to remove the option slot cover so you can install an option card:

Remove the cover as described on page 3-2.

Remove the retaining screw securing the option slot cover and slide out the slot cover as shown in Figure 3-5. Keep the screw to secure the option card to the computer. Store the slot cover in a safe place in case the option card is later removed.

Figure 3-5

Removing/Replacing the Option Slot Cover

Replacing the Option Slot Cover

Follow these steps to replace the option slot cover:

Remove the cover as described on page 3-2.

To replace the option slot cover, insert the cover as shown above in Figure 3-5 and secure it with the retaining screw.

Replace the computer’s cover. (See page 3-4.)

3-6

Epson

NX Service

Manual

Removing

and

Replacing Subassemblies

Installing an Option Card

The computer has four 16-bit option slots located on the option card connector board and

accommodates up to four option cards. (The Epson NX comes with a network card in one

option slot, and some configurations may have a SCSI interface in another slot.) An option

card can occupy any slot. For example, an 8-bit card can be installed in a 16-bit slot. However, the following restrictions apply:

If an 8-bit card has an additional tab along the bottom, it will interfere with the option slot connector and will not fit.

If a disk drive controller card is installed, place the card in one of the lower slots, so the drive cable will not be in the way when replacing the computer’s cover.

If a high-resolution graphics adapter card is installed, place the card in one of the

lower slots, so the cable will reach the VGA feature connector (CN17) on the system

board. Consult the instructions that come with the card for further instructions.

Note Before installing an option card, check to see if any jumper settings on the main

system board need to be changed. For example, if installing a mouse interface card, the settings of jumpers J9 and J12 need to be changed. If installing a video card, the settings of jumpers Jl0 or Jl 1 may need to change. See page l-l2 for more information on jumper settings.

Follow these steps to install an option card that has been removed or to add a new option card in the computer:

Remove the computer’s cover as described on page 3-2.

Remove the option slot cover as described on page 3-6.

Unpack the option card and adjust any switches or jumpers on it, if necessary. (Check the option card instructions.) When handling the card, be careful not to touch any of the components on the circuit board or the gold-plated connectors. If you need to set it

down before you install it, place it gently on top of its original packing material with

the component side facing up. Keep the packing materials in case the card is removed

later.

Hold the card along the top corners and guide it into the connector as shown in Figure

3-4. If installing a full-length card insert the front edge of the card into the

corresponding guide inside the computer’s front panel.

Once the connectors reach the slot, push the card in firmly to insert it fully. If it does

not go in smoothly, do not force it; pull the card all the way out and try again.

Secure the end of the card to the computer’s option slot with the retaining screw that

once held the option slot cover.

Follow the instructions on page 3-4 to replace the computer’s cover.

Epson

NX Service

Manual

3-7

System Unit

Removing the Option Card Riser Board

Follow these steps to remove the option card riser board:

Remove the computer’s cover as described on page 3-2.

Remove any option cards as described on page 3-5.

Caution

the riser board.

Remove the retaining screw securing the bracket to the option card riser board and to the power supply as shown in Figure 3-6. Then remove the bracket.

To prevent damage, remove any option cards before removing

Figure 3-6 Removing the Option Card Riser Board

Using both hands, pull the riser board straight up and out of its socket (CN14).

Set the board aside.

Replacing the Option Card Riser Board

Follow these steps to reinstall the option card riser board inside the computer:

Position the board above its slot (CN14) as shown in Figure 3-6 and then firmly push it straight in.

Secure the bracket to the power supply and then to the board with the retaining screws.

Replace any option cards previously removed before replacing the computer’s cover.

3-8

Epson NX Service Manual

Removing

and

Replacing

Removing SlMMs

If you need to remove SIMMs from the computer, follow these steps:

Remove the computer’s cover as described on page 3-2. Remove any option cards that may be blocking access to the SIMM sockets (see

page 3-5). Use your fingers or a small screwdriver to pull away the metal tabs that secure the

SIMM at each end. Be careful not to pull the tabs too far, or they may bend.

Subassemblies

Metal

Tab

Figure 3-7 Removing SIMMs

As you pull away the tabs, the SIMM falls to the side of its socket as shown in Figure

3-7.

When the SIMM is at an angle, carefully remove the SIMM and store it in an

anti-static bag. Repeat steps 3 and 4 for removing additional SIMMs. Replace any option cards removed (see page 3-7). Replace the computer’s cover (see page 3-4). Run the SETUP program immediately to update the computer’s configuration with the

new memory information.

Epson

NX Service

Manual 3-9

System

Unit

Installing SlMMs

Follow these steps to install SIMMs:

Remove the computer’s cover as described on page 3-2.

Remove any option cards that may be blocking your access to the SIMM sockets (see page 3-5).

The SIMM sockets are located near the front of the computer. Install the first SIMM in the socket farthest from the edge of the main system board. Note that both SIMM sockets must be occupied with the same size SIMM or the system will not work properly.

Position each SIMM so its component side is toward the left side of the computer; then insert it in the socket at a slight angle. (See Figure 3-7.)

Gently press down on the SIMM and, at the same time, press the top corners forward

until the SIMM is vertical and clicks into place between the metal clips and the retaining posts. Make sure the SIMM is fully inserted into the socket and that the

retaining post pins fit into the holes at each end of the SIMM. 6 7

Repeat steps 4 and 5 for each SIMM you want to install. Replace any option cards you removed and the cover. Run the SETUP program immediately in order to update the computer’s configuration

with the new memory information.

3-10 Epson

Service

Manual

Removing

and

Replacing Subassemblies

Installing Another Processor

You can install a future Intel OverDrive processor in the Epson NX system, when it becomes available.

Caution

You must observe strict anti-static procedures to avoid

damaging the CPU as you install or remove it.

Follow these steps to install the CPU in socket U5:

Remove the cover (see page 3-2) and any option card that may be in the way of accessing the socket (see page 3-5). Remove any attached heat sink.

Raise the lever up and over the ZIF socket (see Figure 3-8). This will release the pressure holding the legs of the CPU in the socket.

Gently lift the CPU out of the socket and place it in an anti-static bag for protection.

Figure 3-8 Removing/Installing the Processor

Locate the orientation dot in one corner of the new CPU and turn the CPU so that the dot is in the position shown in Figure 3-8. Be sure the dot is aligned with the corner that has a ” 1” printed on the system board.

Caution

you insert the CPU in the wrong position, you could

permanently damage it.

Gently lower the CPU into the ZIF socket and raise the lever up over the socket so that it locks in place. Examine the CPU to be sure it is inserted all the way into the socket and is secure.

Attach a heat sink to the top of the CPU.

Replace any option card removed and the cover.

Epson

Service Manual

3-11

System Unit

Run the SETUP program immediately to update the computer’s configuration with the new information.

Removing a Drive From the Horizontal Position

Follow these steps to remove a drive from a horizontal position:

Remove the computer’s cover (see page 3-2).

Remove the drive ribbon cable and the power supply cable from the back of the drive. Remove the two front retaining screws securing the diskette drive to the chassis. Then,

gently pull the drive out from the front of the bay as shown in Figure 3-9.

4 5

Keep the screws so that you can use them to install a drive later.

When removing the lower drive, replace the lower drive bay cover on the chassis and

on the front panel as shown in Figure 3-10.

If one of two hard disk drives is removed, the jumpers on the remaining hard disk drive must be changed Check the hard disk drive documentation for details.

3-12 Epson

Replace the cover (see page 3-4).

Reconfigure the system with the SETUP utility before using the computer.

Figure 3-9 Removing/Installing a Horizontal Drive

NX Service

Manual

Removing

and

Replacing Subassemblies

Installing a Drive In the Horizontal Position

Note

On an IDE drive, set any necessary jumpers and take note of the hard disk type number on the label (if present); see your hard disk drive documentation for instructions. If a second hard disk drive is installed, the jumpers on both of the hard disk drives may need to be moved.

Follow these steps to install a drive in the horizontal position:

Remove the computer’s cover as described on page 3-2.

If you are installing a drive in the lower drive bay, remove the two retaining screws securing the drive slot cover to the front of the lower drive bay and remove it. Also, remove the drive slot cover from the front panel. (See Figure 3-10.) Store the cover in a safe place.

Figure 3-10 Removing/Installing Drive Panels

Attach the two mounting rails to the appropriate holes on the sides of the drive with four screws, as shown below. The mounting rails are included with the system and if removed from a drive they should be stored in a safe place for future use.

If you are installing a 5¼-inch diskette drive, turn it so that the diskette drive release latch is above the slot. If installing a 3½-inch diskette drive, turn it so that the eject button is below the slot. If installing a hard disk drive, turn it so that the component side is down. Align the mounting rails on each side of the drive with the notch on each side of the drive bay and slide the drive into the bay.

Secure the drive mounting rails to the front of the chassis with the two retaining screws removed in step 2 above.

Epson

NX Service

Manual

3-13

System

Unit

If you are installing a diskette or tape drive in the lower drive bay, locate the diskette drive cable; one end is connected to the upper diskette drive and the other end is connected to the FDD interface connector (CN7). Use the middle

conneCtor

to connect the second drive. If installing a hard disk drive in the lower drive bay, locate the HDD cable; one end may be connected to an already installed hard disk drive located in the

vertical position outside of the main drive bays and the other end is connected to the HDD interface connector (CN6). Use the middle connector to connect the second drive if one end is already connected to a hard drive or leave the middle connector free and use the end connector if no other HDD drive is present.

Ensure that the connector is aligned properly and fits properly onto the drive interface. See Figure 3- 11.

Figure 3-11 Attaching Drive Cables

Locate one of the power supply cable connectors that lead from the power supply behind the horizontal bays. The cables are labeled PA, PB, PC, and PD; plug the appropriate size connector that is free to the power supply socket in the drive (see Figure 3- 11).

Replace the cover (see page 3-4).

Reconfigure the system with the SETUP utility before using the computer.

Drive

cable

3-14 Epson NX Service Manual

Removing and

Replacing Subassemblies

Removing a Hard Disk Drive From the Vertical Position

Follow these steps to remove an IDE hard disk drive in the vertical position:

Remove the computer’s cover as described on page 3-2.

Remove the HDD mounting bracket screw located on top of the drive bay as shown in Figure 3- 12.

Slide the drive toward the back of the computer and gently lift out the hard drive and

its mounting bracket (the mounting bracket has tabs inserted in slots on the bottom of the system chassis).

4 Remove the four screws located on the back of the hard drive mounting bracket to

remove the hard drive. Keep the screws so that you can use them to install a drive later.

Figure 3-12 Removing/Installing a Vertical HDD

Replace the hard drive mounting bracket onto the drive bay and secure both in place with the screw removed in step 2 above.

Replace the cover (see page 3-4).

Reconfigure the system with the SETUP utility before using the computer.

Epson

NX Service

Manual 3-15

System

Unit

Installing a Hard Disk Drive In the Vertical Position

Follow these steps to install a hard disk drive:

Note

On an IDE drive, set any necessary jumpers and take note of the hard disk type number on the label (if present); see your hard disk drive documentation for instructions.

Remove the computer’s cover as described on page 3-2. Remove the HDD mounting bracket screw located on top of the drive bay. Slide the bracket toward the back of the computer to release the two bottom tabs from

the slots located on the bottom of the system chassis and gently lift it out.

Secure the hard disk drive onto the mounting bracket with the four screws located as shown in Figure 3- 12.

Align the tabs of the mounting bracket with the slots in the bottom of the system

chassis; then slide the bracket toward the front of the computer. Secure the bracket

with the screw removed in step 2 above.

Plug the drive and power cables into the drive (see Figure 3-l 1). If required, connect the drive data cable to the system board. Be sure that you plug the connectors all the

way into their sockets.

Replace the cover (see page 3-4).

Reconfigure the system with the SETUP utility before using the computer.

3-16 Epson

NXService Manual

Removing the Power Supply

Follow these steps to remove the power supply:

Remove the computer’s cover as described on page Disconnect the power cables (connectors PA through PD) from all disk drives. Some

of the cables may not be in use.

Removing

3-2.

and

Replacing Subassemblies

3 4

Disconnect the grounding wire located on the front of the chassis (see Figure 3-13). Remove the two screws securing the power on/off switch to the front panel and pull

the switch back toward the power supply (see Figure 3-13).

Remove any option cards and the option card riser board (see page 3-8).

Disconnect the power cable connectors PS1 and

PS2

from the system board (CN13).

Remove the four screws securing the power supply to the rear panel.

Remove the two screws securing the power supply to the base of the system chassis and then the two screws attaching the power supply chassis bracket. Save all screws and the power supply chassis bracket to reinstall the power supply later.

Pull the power supply toward the front of the chassis until the back of the power supply has cleared the rear panel. Then lift it up and set it aside.

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Service Manual

3-17

System Unit

Reinstalling the Power Supply

Follow these steps to reinstall the power supply:

Position the main chassis so its right side is facing you.

Attach the power supply chassis bracket to the power supply with two screws. Align the holes between the power supply and the rear panel and the stand-offs where

the power supply chassis bracket will be secured.

Using four screws, secure the power supply to the rear panel. Using two screws, secure the power supply chassis bracket to the chassis. Connect the power cables PSI and PS2 from the power supply to the system board

connector CN13 (see Figure 3-14).

PS2

PSl

Figure 3-14 Power Supply Power Cables

Reinstall the option card riser board and any option cards (see page 3-8).

Push the power switch through the front panel and secure it in place with two screws.

Connect the grounding wire to the front of the chassis.

Connect one power cable (connectors PA through PD) to each drive in the system (see Figure 3-l 1). Some of the cables may not be in use.

Replace the cover (see page 3-4).

Connect the computer’s power cable from the electrical outlet to the input receptacle

located at the rear panel. Also connect any peripheral device cables that were

previously disconnected from the computer, including the keyboard and mouse.

3-16 Epson NX Service Manual

Removing the Speaker

Follow these steps to remove the speaker:

Remove the cover (see page 3-2) and any option cards that may be in the way (see page 3-5).

Disconnect the speaker cable from CN3 on the system board From the front of the chassis lift up on the lower speaker unit tab to release it from the

lower chassis mounting hole (see Figure 3-15). From the backside of the front chassis, pull the bottom of the speaker unit up and

away from the front of the chassis. From the backside of the speaker unit the speaker can be removed by pushing it out of

its holder.

Removing

and

Replacing

Subassemblies

Speaker assembly

LED

assembly

Figure 3-15 Speaker and LED Assemblies

Replacing the Speaker

Follow these steps to replace the speaker:

From the backside of the front chassis, insert the upper tab of the speaker unit into the upper mounting hole and lower the bottom tab of the speaker unit down and into the

lower mounting hole in the front of the chassis (see Figure 3-15).

Connect the speaker cable to CN3 on the system board.

Replace any option cards removed and the cover.

Epson

NX Service

Manual

3-19

System Unit

Removing the LEDs

Follow these steps to remove the LEDs:

Remove the cover (see page 3-2) and any option cards that may be in the way (see page 3-5).

Disconnect the LED cables from CN15 and CN16 on the system board.

From the front of the chassis, press in on the right side of the LED unit and pull it

forward to release it from the right chassis mounting hole. (See Figure 3-15.)

Continue bringing the right side of the LED unit forward and away from the front of the chassis until the left tab of the LED unit clears its mounting hole.

Replacing the LEDs

Follow these steps to replace the LED unit:

Ensure the LED wires are inserted through the LED access hole in the front of the chassis. Insert the left tab of the LED unit into its mounting bracket, then swing the right locking tab into its mounting hole. Ensure the LED wires are inserted through the LED access hole in the front of the chassis.

Rush the right locking tab through its hole in the front of the chassis. (See Figure 3-15.)

Connect the HDD LED cable to CN15 and the speed LED cable to CN 16.

Replace any option cards removed and the cover.

3-20

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NX Service

Manual

Removing

and

Replacing Subassemblies

Removing the BIOS EPROMs

Follow these steps to remove the BIOS EPROM chips from sockets Ul and U113:

Remove the cover (see page 3-2) and any option cards that may be in the way (see

page 3-5).

Caution

You must observe strict anti-static procedures to avoid

damaging the EPROMs as you install or remove them.

With a chip puller, lift each EPROM out of its socket and place it in an anti-static bag for protection.

Replacing the BIOS EPROMs

Follow these steps to install the BIOS EPROM chips in sockets Ul and U113:

Remove the cover (see page 3-2) and any option cards that may be in the way (see page 3-5).

Gently insert the System/VGA EPROM into socket Ul. Align the half-circle notch of the chip with the notch of the socket to assure proper orientation (see Figure 3-16).

Figure 3-16 BIOS Chips Installation

Gently insert the SETUP Text EPROM into socket U113. Align the half-circle notch of the chip with the notch of the socket to assure proper orientation (see Figure 3-16).

Replace the cover and any option cards removed

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Service

Manual

3-21

System Unit

Removing the System Board

Follow these steps to remove the system board:

Remove the cover (see page 3-2), any option cards (see page 3-5), and the option card

riser board (see page 3-8).

Disconnect the power supply cables from CN13, any drive cables from CN6 and CN7, the speaker and LED connectors at CN3, CN11 and CN16, any VGA feature connector at CN17, and cables connected to the serial, parallel, mouse, video, and keyboard ports.

Remove the six screws that secure the system board to the main chassis (see

Figure 3-17).

3-22

Figure 3-17 Removing/Replacing the System Board

Pull the system board forward then tilt it up. Then pull the system board slightly toward you and lift it up and out of the chassis. Place the system board on an anti-static surface or in an anti-static bag for protection.

Epson NX Service Manual

Replacing the System Board

Follow these steps to replace the system board:

From the left side of the chassis, insert the system board into the chassis at a slight

angle.

Removing and Replacing Subassemblies

Slide the far edge of the system board under the drive bay.

Lower the board into the chassis and position the six screw holes over the mounting

holes in the chassis.

Secure the board with the six retaining screws (see Figure 3-17).

Reinstall the option card riser board (see page 3-8) and replace any option cards (see page 3-7).

Reconnect all cables and replace the cover.

Removing the Front Bezel

Follow these steps to remove the front bezel:

Remove the cover (see page 3-2).

Remove the two retaining screws located on the back side of the bezel as shown in Figure 3-18.

Figure 3-18 Removing/Replacing the Front Bezel

Set the cover upside down on a smooth flat surface and locating the front bezel locking tabs gently press down on the tabs while pulling the bezel away from the cover.

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Service Manual

3-23

System Unit

Replacing the Front Bezel

Follow these steps to replace the front bezel:

Set the cover upside down on a smooth flat surface and gently push the front panel

locking tabs into the tab slots located in the front end of the cover.

Secure the front panel to the cover with the two retaining screws (see Figure 3-18).

Replace the cover (see page 3-4).

3-24

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Reference Materials

Contents

Hard Disk Drive Types System I/O Address Map DM Assignments Hardware Interrupts.

Connector Pin Assignments.

Auxiliary Fan Connector. VGA Port Connector.

Speaker Connector Serial Port Connectors Parallel Port Connector. IDE Hard Disk Drive Data Connector Diskette Drive Data Connector. Keyboard and Mouse Connectors. Battery Connector. ResetConnector Power Supply Connectors

Option Card Riser Board Connector. HDD Access LED Connector. Power (SPEED) LED Connector VGA Feature Connector Option Slot Connectors. Drive Power Connectors Intel Ether Exprcss 16C

SMC Ether Card PLUS Elite16 Combo Adaptec AHA-1540B..

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A-l

A-2 A-5

A-6

A-7

A-7 A-7 A-8 A-8

A-9 A-10 A- 11 A-12 A-13 A-13 A-14 A-14

A-16 A-16 A-17 A-18 A-19 A-19 A-20 A-21

List of Abbreviations

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Epson NX Service Manual

A-24

A-i

Figures

Figure A-l Auxiliary Fan Connector

Figure A-2 VGA Port Connector Figure A-3 Speaker Connector Figure A-4 Serial Port Connector. Figure A-5 Parallel Port Connector. Figure A-6 IDE Hard Disk Drive Data Connector.

Figure A-7 Diskette Drive Data Connector Figure A-8 Keyboard and Mouse Connector Figure A-9 Battery Connector. Figure A-10 Reset Connector Figure A-11 Figure A-12 Option Card Riser Board Connector Figure A- 13 Power (SPEED) LED Connector. Figure A-14 HDD Access LED Connector. Figure A-15 VGA Feature Connector Figure A- 16 Option Slot Connector Figure A-17 Drive Power Connector Figure A-18 SMC Ether Card PLUS Elite 16 Combo Figure A-18 Adaptec Jumper Locations.

Power Supply Connector

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A-7 A-7 A-8 A-8

A-9

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A-10

A- 11

A- 13

A-13 A- 14

A-16 A-17 A-18 A-19 A-20 A-21

Tables

Table A-l

Table A-2 Table A-3 Table A-4 Table A-5 Table A-6 Table A-7 Table A-8 Table A-9 Table A- 10 Table A- 11 Table A-12 Table A-13 Table A-14 Table A-15 Table A-16 Table A-17 Table A-18 Table A-19 Table A-20 Table A-21

Auxiliary Fan Connector Pin Assignments VGA Port Connector Pm Assignments Speaker Connector Pin Assignments Serial Port Connector Pin Assignments. Parallel Port Connector Pin Assignments IDE Hard Disk Drive Data Connector Pin Assignments. Diskette Drive Data Connector Pin Assignments Keyboard and Mouse Connector Pin Assignments Battery Connector Pin Assignments. Reset Connector Pin Assignments Power Connector Pin Assignments Option Card Riser Board Connector Pin Assignments HDD Access LED Connector Pin Assignments Power (SPEED) LED Connector Pin Assignments. VGA Feature Connector Pin Assignments. Option Slot Connector Pin Assignments Drive Power Connector Pin Assignments Intel Ether Express LED Indicators

SMC Ether Card LEDs Adaptec Default Settings Adaptec Jumper Settings

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A-7 A-7 A-8 A-8

A-9 A- 10 A-11 A-12 A-13 A-13 A-14 A-15 A-16 A-16 A-17 A-18 A- 19 A-19 A-20 A-21

A-22

A-ii

Epson NX Service Manual

Hard Disk Drive Types

Epson NX Service Manual

A-l

Had Disk Drive

Types

A-2

Epson

NX Service

Manual

System l/O Address Map

Epson

NX Service

Manual A-3

System

I/O

Address Map

A-4

Epson NX Service Manual

DMA Assignments

Epson

Service Manual

A-5

Hardware Interrupts

A-6

Epson

NX Service Manual

Reference MateriaIs

Connector Pin Assignments

This section describes the pin assignments of each connector in the system.

Auxiliary Fan Connector

The auxiliary fan connector (CN1) is a 2-pin connector that has no posts and is in place for future use. Figure A-l shows the connector and Table A-l provides the pin assignments.

VGA Port Connector

The VGA connector (CN2) is a 15-pin D-shell, female receptacle accessible from the rear of the computer. Figure A-2 shows the connector and Table A-2 provides the pin assignments.

Table A-2

VGA Port Connector Pin Assignments

Epson

Service Manual

A-7

Connector Pin Assignments

Speaker Connector

The speaker connector (CN3) is a 4-pin, male header connector, accessible from inside the computer and located on the system board Figure A-3 shows the connector and Table A-3

provides the pin assignments.

Serial Port Connectors

The serial ports (CN4 and CN8) are 9-pin, D-shell male connectors, accessible from the rear of the computer. Figure A-4 shows the connector and Table A-4 provides the pin assignments.

Table A-4

Serial Port Connector Pin Assignments

A-8

Epson NX Service Manual

Parallel Port Connector

The parallel port connectar (CNS) is a 25-pin, D-shell female connector, accessible from the rear of the computer. Figure A-5 shows the connector and Table A-5 provides the pin

assignments.

Epson NX Service Manual A-9

Connector Pin Assignments

IDE Hard Disk Drive Data Connector

The IDE hard disk drive data connector (CN6) is a 40-pin, header connector, accessible from inside the computer and located on the system board. Figure A-6 shows the connector and Table A-6 provides the pin assignments.

A-10

Epson

NX Service

Manual

Reference Materials

Diskette Drive Data Connector

The diskette drive data connector (CN7) is a 34-pin header connector, accessible from inside the computer and located on the system board. Figure A-7 shows the

A-7 provides the pin assignments.

connector and

Table

Epson

NX Service

Manual

A-11

Connector Pin Assignments

Keyboard and Mouse Connectors

The mouse (CN9) and keyboard (CNlO) connectors are 6-pin mini DIN receptacles, accessible from the rear of the computer. Figure A-8 shows the connector and Table A-8 provides the pin assignments.

Note Although the keyboard and mouse connectors are physically identical, they cannot be

used interchangeably.

A-12 Epson

NX Service

Manual

Battery Connector

The battery connector (CNll) is a 2-pin, male header computer and located on the system board Figure A-9 shows the connector and Table A-9 provides the pin assignments.

connector,

accessible from inside the

Reset Connector

The reset connector (CN12) is a 2-pin connector that has no posts and is in place for future use. Figure A- 10 shows the connector and Table A-10 provides the pin assignments.

Figure A-10 Reset Connector

Table A-10

Reset Connector Pin Assignments

Epson

Service Manual

A-13

Connector Pin Assignments

Power Supply Connectors

The power connector (CN13) is a 12pin male header connector. It is located on the system board and supplies power to the board and the option slots. Figure A- 11 shows the connector; Table A- 11 provides the pin assignments.

Figure A-11 Power Supply Connector

Table A-11

Power Connector Pin Assignments

Option Card Riser Board Connector

The riser board connector (CN14) is a 120-pin, female recepticle that supplies power and interface lines to the four option slots on the riser board. Figure A-12 shows the connector and Table A-12 provides the pin assignments.

A-14

Epson

NX Service Manual

Reference Materials

Table A-12

Option Card Riser Board Connector Pin Assignments

Epson

NX Service

Manual

A-15

Connector Pin Assignments

HDD Access LED Connector

The HDD access LED connector (CN15) is a 2-pin, male header connector, accessible from inside the computer and located on the system board Figure A-14 shows the connector and Table A-13 provides the pin assignments.

Power (SPEED) LED Connector

The Power LED connector (CN16) is a 3-pin, male header connector, accessible from inside the computer and located on the system board. Figure A-13 shows the connector and Table

A-14 provides the pin assignments.

Figure A-13 Power (SPEED) LED Connector

Table A-14

Power (SPEED) LED Connector Pin Assignments

A-16

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Manual

VGA Feature Connector

The VGA Feature connector (CN17) is a 26-pin header, accessible from the inside of the computer. Figure A-15 shows the connector and Table A- 15 provides the pin assignments.

Figure A-15 VGA Feature Connector

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NX service

Manual

A-17

Connector

Pin Assignments

Option Slot Connectors

The option slot connectors on the riser board are 98-pin, female receptacles. Figure A-16 shows one of these connectors and Table A-16 provides the pin assignments.

Figure A-16 Option Slot Connector

Table A-16

Option Slot Connector Pin Assignments

A-16

Epson

Service Manual

Drive Power Connectors

Connectors PA through PC are functionally the same and provide power to disk and tape drives. PD has a different shape, but has the same pin assignments. Figure A-17 shows one

of the connectors. Table A-17 provides the pin assignments.

Intel Ether Express 16C

The Intel EtherExpress 16C is a 16-bit, ISA-compatible Ethernet adapter card that supports

BNC coax (thin Ethernet), AUI DB-15S (thick Ethernet), and RJ45 (10BaseT Ethernet). The

card is software configurable for I/O address, IRQ, connector type, and I./O or

memory-mapped buffering. A diagnostic utility is included.

Table A-18

Intel EtherExpress LED Indicators

Epson

Service

Manual

A-19

Connector Pin Assignments

SMC Ether Card PLUS Elite16 Combo

The SMC EtherCard PLUS Elite16 Combo is a 16-bit, ISA-compatible Ethernet adapter card that supports UTP, BNC coax (thin Ethernet), AUI DB-15s (thick Ethernet). The card is software configurable for I/O address, IRQ, connector type, and I/O or memory-mapped buffering. A diagnostic utility is included.

By default this card uses I/O address 280, IRQ3, and RAM base address D0000. You can move jumper W 1, shown in the figure above, to SOFT to use the adapter setup program to select the I/O address, IRQ, and RAM base address; or move it to 300, 10, CC000 to select I/O address 300, IRQlO, and RAM base address CC000.

Table A-19

SMC EtherCard LEDs

A-26

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Service

Manual

Adaptec

AHA-1504B

Figure A-19 Adaptec Jumper Locations

Table A-20

Adaptec Default Settings

Epson

Service Manual

A-21

Epson NX User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

System Overview

General Features

Options

Upgrades

Document Sources

Emissions and Safety Agency Information

Environmental Specifications

Subassembly Descriptions

Case

System Board

Connectors and Jumpers

Power Supply

Memory

CMOS RAM

Mass Storage

Keyboard

General Information

Recommended Service Tools

Epson Authorized Replacement Modules

Power-On Diagnostics and Boot Errors

Error Beep Codes

General System Problems

Power or Lock-up Problems

Keyboard Problems

Video Problems

Diskette Drive Problems

Hard Disk Problems

System Software Problems

Parallel Printer Problems

Serial Port Problems

Option Card Problems

Memory Module Problems

Mouse Problems

Troubleshooting with the NeXTSTEP Operating System

General Service Information

System Unit

Removing the Cover

Replacing the Cover

Removing an Option Card

Removing the Option Slot Cover

Replacing the Option Slot Cover

Installing an Option Card

System Unit

Removing the Option Card Riser Board

Replacing the Option Card Riser Board

Removing SlMMs

Installing SlMMs

Installing Another Processor

Removing a Drive From the Horizontal Position

Installing a Drive In the Horizontal Position

Removing a Hard Disk Drive From the Vertical Position

Installing a Hard Disk Drive In the Vertical Position

Removing the Power Supply

Reinstalling the Power Supply

Removing the Speaker

Replacing the Speaker

Removing the LEDs

Replacing the LEDs

Removing the BIOS EPROMs

Replacing the BIOS EPROMs

Removing the System Board

Replacing the System Board

Removing the Front Bezel

Replacing the Front Bezel

Hard Disk Drive Types

System l/O Address Map

DMA Assignments

Hardware Interrupts

Connector Pin Assignments

Auxiliary Fan Connector

VGA Port Connector

Speaker Connector

Serial Port Connectors

Parallel Port Connector

IDE Hard Disk Drive Data Connector

Diskette Drive Data Connector