® EPSON NX Service Manual Printed on Recycled Paper.
Revision Level Copyright Information © 1993, Epson America, Inc. 20770 Madrona Avenue Torrance, CA 90509 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.
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.
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.
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.
System Description System Description Contents System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GeneralFeatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FrontPanel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RearPanel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 Figure l-9 Figure l-10 Figure 1 - 11 System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FrontView . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rearview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CPU Upgrade Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
System Overview General Features The following features are standard: cl Intel i486DX2/66 CPU cl PGA CPU-type ZIF socket that can also contain a future OverDrive processor P 8KB CPU Cache and Epson VirtualCache TM TM (secondary) cl C&T Wingine 64200 video display driver 0 Diskette drive (3%inch) 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 cl 20MB of on-board memory in the 170MB or 240MB HDD c
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.
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.
System Description Options In addition to the standard configurations, the following are available: cl An optional 3½-inch or 5¼-inch diskette drive ci 3½-inch 8OMB, 12OMB, or 240MB IDE hard disk drives cl 1, 4, 16, or 64MB (when available), 36-bit, 70-ns SIMM option kits cl VGA, Super VGA, and multi-frequency color monitors cl Epson 25OMB tape backup drive a Media Vision Spectrum cl Labtec CSS-550 speaker option kit.
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.
System Description Environmental Specifications Table l-5 lists the. environmental specifications for the Epson NX.
Subassembly Descriptions Subassembly Descriptions This section gives descriptions and specifications for the following subassemblies: 0 Case cl System board along with connectors and jumpers 0 Power supply cl Memory ci Disk drives 0 Keyboard. Figure l-5 shows the major subassemblies of the computer.
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.
Subassembly Descriptions Figure l-6 System Board Components 1-10 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.
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.
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 115/23OV input select switch cl AC input connector for detachable power cord cl Cooling fan.
Subassembly Descriptions Table 1-12 Power Supply Specifications Figure l-8 shows the power supply cable layout and connectors.
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.
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.
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. l 20MB of RAM is standard for 170MB and 240MB HDD configurations; 36MB of RAM is standard for the 525MB HDD configuration.
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 the drive bay on the right side. Diskette, CD-ROM, cx 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.
System Description Specifications for the Conner CP30174E HDD Table 1-16 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 = C/D jumpered Slave = C/D not jumpered Quantum LPS240AT 24OMB IDE HDD Master = DS jumpered Slave = not jumpered (or if drive is configured for cab/e selection using the CS jumper, the drive is a master drive if pin 28 is grounded and a slave if pin 28 is not grounded) Quantum LPS525S 525MB SCSI HDD See Table 1-19 for jumper settings. Figure l-10.
System Description Table 1-19 Quantum LPS525S Jumper Settings bus (to be used when drive is * Factory default jumper setting Epson NX 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.
Troubleshooting 2 Troubleshooting Contents General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Service Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Epson Authorized Replacement Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power-On Diagnostics and Boot Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-l 2-l 2-2 Error Beep Codes . . . . . . . . .
Tables Table Table Table Table 2-ii 2-l 2-2 2-3 2-4 Recommended Service Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Authorized Replacement Modules . . . . . . . . . . . . . . . . . . . . . . . . . Power-on Diagnostic Error Messages . . . . . . . . . . . . . . . . . . . . . . Error Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 Power-on diagnostics and boot errors cl Error tone codes cl General system problems. Recommended Service Tools The recommended service tools are listed in Table 2-1. All tools are commercially available.
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 Rep lacement of these components is performed only by authorized service centers outside the U.S. Servicers In the U.S.
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.
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. should replace the system board when there is a malfunction of any of the components marked with an asterisk.
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 by authorized service centers outside the U.S.
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.
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.
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: 1 Make sure the keyboard cable is securely connected to the keyboard port and not the mouse port. 2 Check the keyboard cable connector for any bent or missing pins. If necessary, repair the connector or replace the cable.
Genera/ System Problems Sticking Keys When the keys are sticking, follow these suggestions: 1 Make sure the keyboard’s upper and lower cases are properly aligned. 2 Remove the sticking keys and clean all internal parts. 3 Remove the keys and replace any broken parts.
Troubleshooting 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.
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: 1 Run the SETUP program and make sure the diskette drive type is set correctly and the diskette drive controller is enabled.
Troubleshooting Hard Disk Problems If there is a problem with the hard disk drive, see the suggestions below: Figure 2-5 Hard Disk Problems Newly-installed Drive Problems If there is a problem with a newly installed drive, follow these suggestions: 1 Verify that you ran the SETUP program to enable the built-in hard disk controller and have defined the hard disk drive type correctly. 2 Check all the cable connections to make sure you installed the drive correctly. (See page 3-16.
General System Problems Hard Disk Boot Failure When the computer starts but does not load the operating system, follow these suggestions: 1 Run the SETUP program and make sure the hard disk drive type is correct. 2 Boot the system from a DOS system diskette in drive A. Then enter the command DIR C: . (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 to step 4.
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.
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.
Troubleshooting Option Card Problems If there is a problem using an option card, follow the suggestions below: 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.
General System Problems Memory Module Problems If there is a problem using a SIMM, follow the suggestions below: Figure 2-10 Memory Module Problems 2-18 1 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. 2 Verify the speed of the SIMMs.
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 1 Make sure the mouse cable is securely connected to the mouse port (CN9) and not to the keyboard port (CNl0). 2 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.
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. 1 Like the UNIX operating system, NeXTSTEP needs to be powered down in an orderly manner.
Removing and Replacing Subassemblies Removing and Replacing Subassemblies Contents General Service Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removing the Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing the Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures Figure 3-l Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 3-8 Figure 3-9 Figure 3- 10 Figure 3-11 Figure 3- 12 Figure 3-13 Figure 3-14 Figure 3- 15 Figure 3-16 Figure 3-17 Figure 3-18 3-ii Removing the Cover Retaining Screws . . . . . . . . . . . . . . . . . . . . . Removing the Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Replacing the Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
System Unit System Unit This section describes how to remove and replace the components of the main system unit. Removing the Cover WARNING Be sure to ground yourself by touching the back panel of the 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.
Removing and Replacing Subassemblies 6 Turn the computer around again so that the front panel is facing you. 7 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 8 Set the cover aside on a flat surface.
System Unit Replacing the Cover To replace the computer’s cover, follow these steps: 1 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 3-4 2 Lower the cover and slide it straight back over the computer until it stops against the rear panel. 3 Replace the three cover retaining screws as shown in Figure 3- 1.
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: 1 Remove the computer’s cover as described on page 3-2. 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.
System Unit Removing the Option Slot Cover Follow these steps to remove the option slot cover so you can install an option card: 1 Remove the cover as described on page 3-2. 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.
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.
System Unit Removing the Option Card Riser Board Follow these steps to remove the option card riser board: 1 Remove the computer’s cover as described on page 3-2. 2 Remove any option cards as described on page 3-5. Caution To prevent damage, remove any option cards before removing the riser board. 3 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.
Removing and Replacing Subassemblies 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.
System Unit Installing SlMMs Follow these steps to install SIMMs: 3-10 1 Remove the computer’s cover as described on page 3-2. 2 Remove any option cards that may be blocking your access to the SIMM sockets (see page 3-5). 3 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.
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: 1 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.
System Unit 8 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: 1 Remove the computer’s cover (see page 3-2). 2 Remove the drive ribbon cable and the power supply cable from the back of the drive. 3 Remove the two front retaining screws securing the diskette drive to the chassis.
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: 1 Remove the computer’s cover as described on page 3-2.
System Unit 6 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.
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: 1 Remove the computer’s cover as described on page 3-2. 2 Remove the HDD mounting bracket screw located on top of the drive bay as shown in Figure 3- 12.
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.
Removing and Replacing Subassemblies Removing the Power Supply Follow these steps to remove the power supply: 1 Remove the computer’s cover as described on page 3-2. 2 Disconnect the power cables (connectors PA through PD) from all disk drives. Some of the cables may not be in use. 3 Disconnect the grounding wire located on the front of the chassis (see Figure 3-13).
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.
Removing and Replacing Subassemblies 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.
System Unit Removing the LEDs Follow these steps to remove the LEDs: 1 Remove the cover (see page 3-2) and any option cards that may be in the way (see page 3-5). 2 Disconnect the LED cables from CN15 and CN16 on the system board. 3 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.
Removing and Replacing Subassemblies Removing the BIOS EPROMs Follow these steps to remove the BIOS EPROM chips from sockets Ul and U113: 1 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. 2 With a chip puller, lift each EPROM out of its socket and place it in an anti-static bag for protection.
System Unit Removing the System Board Follow these steps to remove the system board: 1 Remove the cover (see page 3-2), any option cards (see page 3-5), and the option card riser board (see page 3-8). 2 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.
Removing and Replacing Subassemblies Replacing the System Board Follow these steps to replace the system board: 1 From the left side of the chassis, insert the system board into the chassis at a slight angle. 2 Slide the far edge of the system board under the drive bay. 3 Lower the board into the chassis and position the six screw holes over the mounting holes in the chassis. 4 Secure the board with the six retaining screws (see Figure 3-17).
System Unit Replacing the Front Bezel Follow these steps to replace the front bezel: 3-24 1 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. 2 Secure the front panel to the cover with the two retaining screws (see Figure 3-18). 3 Replace the cover (see page 3-4).
Reference Materials A Reference Materials Contents Hard Disk Drive Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-l System I/O Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 DM Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5 Hardware Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 NX 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.
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.
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.
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.
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 connector and Table A-7 provides the pin assignments.
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.
Battery Connector The battery connector (CNll) is a 2-pin, male header connector, accessible from inside the computer and located on the system board Figure A-9 shows the connector and Table A-9 provides the pin assignments. 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.
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.
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.
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.
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.
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).
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.
Adaptec AHA-1504B Figure A-19 Adaptec Jumper Locations Table A-20 Adaptec Default Settings Epson NX Service Manual A-21
Connector Pin Assignments Table A-21 Adaptec Jumper Settings A-22 Epson NX service Manual
Adaptec Jumper Settings Continued Epson NX Service Manual A-33
List of Abbreviations List of Abbreviations A-24 Epson NX Service Manual
Reference Materials Epson NX Service Manual A-25
System Utilities System Utilities Contents Running the SETUP Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starting the SETUP Program Stored in ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . The SETUP Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selecting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting the Date and Time . . . . . . . . .
Option 1, Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Modifying the Defective Track Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Formatting the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Option 2, Destructive Surface Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Option 3, Non-destructive Surface Analysis . . . . . . . . . . . . . . . . . . . . . . . . .
System Utilities Running the SETUP Program If components were removed from, replaced, or upgraded in the computer, run the SETUP program to define the new system configuration. The SETUP program is stored in the computer’s read-only memory (ROM) and is available during power-on diagnostics and after a computer reset by pressing F2.
Running the SETUP Program Starting the SETUP Program Stored in ROM To start SETUP, make sure there is no diskette in the diskette drive. Then turn on the computer. (If the computer is on, press Ctrl, Alt, Del to reset it; or turn it off, wait 20 seconds, and then turn it on again.
System Utilities Selecting Options A solid cursor bar highlights the option currently selected. You can scroll through the options using the up and down arrow keys ( or ). When you reach an option you want to change, press Enter to edit the option. Then press the + or - keys on the numeric key pad or the keyboard - or shift + to toggle between choices. When the setting is correct, press or to go to the next option. Table B-l lists the keys you can use to perform all SETUP operations.
Running the SETUP Program Setting the Date and Time To change the date and/or time, follow these steps: 1 Press F3. You see the date prompt: 2 The cursor flashes in the month (mm) field. If the entire date is correct, press Enter and go to step 5. If the date needs to be changed, type two digits for the current month, such as 09 for September. The cursor moves to date (dd) field. 3 Type the current, two-digit date, and the cursor moves to the year (yyyy) field.
5 Now you see the time prompt: If the time is correct, press Enter. If the time needs to be changed, type in the current hour (hh), then minutes (mm), and then seconds (ss) according to a 24-hour clock (For example, 5 p.m. would be hour 17.) Then press Enter. (If you make a mistake, press Backspace to erase the characters before you press Enter.) If an invalid time (such as hour 25) is entered, the time prompt will flash on the hour (hh) field again. Repeat step 5 again and enter a valid date.
Running the SETUP Program Setting the Processor Speed Options There are three processor speed options available to customize the system’s processing speed. The table below lists these options and their default settings. Table B-2 Processor Speed Options The Auto speed and Power-on low speed optionsahowthecomputer’s processor to operate at one of three different speeds: high, low, and automatic speed.
System Utilities Setting the Fast Boot Option Enabling the Fast boot option allows the power-on diagnostic testing to skip certain system memory tests. The default is Disabled. Setting the System and Video BIOS Options The computer’s shadow RAM feature copies the contents of the system and video BIOS ROM (and any external BIOS ROM installed) into RAM so the computer can perform certain operations faster. The computer enables shadow RAM automatically.
Running the SENTUP Promgram Setting the Keyboard Options There are four keyboard options available: 0 Keyboard function 0 Keyboard delay cl Keyboard speed 0 Num Lock status after boot. The Keyboard function must he set to its default setting (Enabled) to change the delay and speed setting. The Num Lock status after boot setting can he changed anytime. The Keyboard delay default setting is 250 ms, or ¼ second The options are 0, 250, 500, 750, or 1000 milliseconds (ms).
System Utilities Setting the Built-in l/O Port Options The I/O (input/output) port options let you define how the following ports operate: LJ Primary parallel port (LPTl) cl Primary serial port (COMl) 0 Secondary serial port (COM2) Li Speaker D Diskette drive controller cl Hard disk controller. Setting the Parallel Port The parallel port’s default setting is Enabled which designates it as LPT1. If the Primary parallel port is to he ignored as LPTl change the setting to D i s a b l e d .
Running the SETUP Program Setting the Port Configuration The I/O (input/output) port address options let you define the address for the following ports: Primary parallel port Primary and secondary serial ports. The table below list the I/O address options for each port. Table B-3 I/O address options. Network Server and Password Status The password status options let you define the password for the following: cl Network server mode Cl Password security a Password.
System Utilities Setting the Password The default setting is Not set. To set a password press Enter. You see the message below on the help line: sets password Note Change the settingsof Password security and/or Network server security from Disabled to Enabled before setting a password. Press F2 and you see the prompt Enter Power on Password. Type in your password and press Enter. The Password option setting changes to Set.
Running the SETUP Program Defining Your Own Drive Type If the parameters for the hard disk (listed in its documentation) do not match any of the types listed in Appendix A, you can define your own type. Follow these steps: 1 Highlight the Hard disk 1: or Hard disk 2 : option, and press Enter.
System Utilities Setting the Non-cache Areas The computer automatically caches all the system memory except two non-cache address areas listed in the table below. You can enable or disable caching in any of the six, System Defined Cache Control Areas and two sets of additional User Defined non-cached Areas (also listed in the table below). Note The computer does not cache any RAM that is installed on an option card.
Running the SETUP Program Setting the Cache Test and User Control Options Using SETUP, you can enable or disable the computer’s internal cache (built into the microprocessor) or external cache (built into an optional cache module). The default setting for both cache options is Enabled. Disable the cache if it malfunctions or if you are using timing-loop-dependent software that requires a slower system speed.
System Utiliti8s Performing System Diagnostics This section describes how to test the operation of your computer and its peripheral devices using the System diagnostics program on your Reference diskette. Run the diagnostics program if you are not sure whether a device is performing correctly.
Performing System Diagnostics Starting the System Diagnostics Program Follow these steps to start the System diagnostics program: 1 Insert the Reference diskette in drive A and turn on the computer. Note Always boot the computer from the Reference diskette to start System diagnostics. This clears any terminate-and-stay-resident (TSR) programs or other utilities from memory and frees it for use by the diagnostics program. 2 At the A: prompt, type DIAG and press Enter.
System Utilities Deleting Tests To remove devices from the Items Detected list so the system diagnostics program cannot test them, follow these steps: 1 Press + to select Delete Tests. You see the Delete menu, as shown below: 2 Press or to highlight the device you want to delete and press Enter. The device is removed from the Delete menu. You can delete as many devices as you want. 3 When you are finished deleting devices, press <- to select Execute; see “Running Tests” on page B-19.
Performing System Diagnostics Adding Tests If you want to add devices to the Items Detected list, follow these steps: 1 Press <- or -> to select Add Tests. You see the following Add menu: 2 Press or to highlight the device you want to add and press Enter. The device is removed from the Add menu and added to the Items Detected list. You can add as many devices as you want. 3 When you are finished adding devices, press <- to select Execute. Then see the next section.
System Utilities Running Tests Follow these steps to run a test from the Execute menu: 1 Press <- or -> to select Execute.
Performing System Diagnostics 3 If there is only one test for a device, the program begins testing immediately. If there is more than one test for the device, you see a submenu. 4 Note If you selected to run the tests more than once, you do not see a submenu. The program immediately begins executing all the tests that do not destroy data. 5 When the test is completed, you see the Execute menu or the test submenu again. You can select another test or exit the menu.
System Utilities System Diagnostics Tests The table below lists all the system diagnostics tests you can run on your system. Table B-6 System Diagnostics Tests *The Write/Read check destroys data on the disk.
Performing System Diagnostics Error Messages The following table lists all the error messages that may appear during system diagnostics testing.
System Utilities Epson NX Service Manual B-23
Formatting a Had Disk Formatting a Hard Disk This section describes how to low-level (or physically) format a hard disk. This procedure should not be confused with the logical format performed by the operating system. The physical formatting of a hard disk is a separate step that is usually done at the factory by the disk manufacturer. If the computer came with a factory-installed hard disk, or if you installed an optional IDE hard disk from Epson, it has already been physically formatted.
System Utilities Fomatting a New Disk To format a new hard disk that has never been formatted, select the Format option. You may need to modify the defective track table to add bad tracks when you format the disk Many hard disk drives come with a printed list of bad tracks, but the bad tracks am not flagged on the disk Other hard disks (such as Epson’s disks) come with the bad tracks already flagged.
Formatting a Had Disk Option 1, Format If you select Format from the Hard Disk Format Menu, you see the following (for a disk with no defective track table): Format Hard Disk < Drive n: > Scan hard disk to get defective track information? (Y/N) (If the disk already has a defective track table, you do not see this because you do not need to scan for bad tracks.) 1 Enter Y to scan the disk or N to skip the scanning process.
System Utilities To enter a new value, select N. You see the following prompt: Enter new skewed sectors per head in format (O-16): Enter the recommended number, which equals the maximum sector number for the drive minus 1. The maximum sector number varies, depending on the drive type. Then press Enter. 4 The program now allows you to edit the defective track table. At the bottom of the table is this prompt: Modify defective track table ? (Y/N) Select N if you want to leave the table as it is.
Formatting a Hard Disk Fotmatting the Disk When you are ready to start formatting the disk, you see the following warning: WARNING! ALL DATA WILL BE DESTROYED IN ALL PARTITIONS OF HARD DISK, NOT JUST IN MS-DOS PARTITION! Do you want to start formatting ? (Y/N) If you are not sure you want to format the hard disk, select N. If you are sure, select Y; the program gives you one more chance to cancel: DOUBLE CHECK THAT YOU HAVE BACKUP DISKETTE COPIES OF ALL YOUR FILES.
System Utilities Option 2, Destructive Surface Analysis You can perform a destructive surface analysis of your hard disk to accurately locate any bad tracks and flag them, if they are not flagged. The test writes, reads, and verifies information on every track of the hard disk, except for tracks that are already flagged as bad. To start this test, select Destructive surface analysis from the Hard Disk Format Menu.
Formatting a Hard Disk Option 3, Non-destructive Surface Analysis The non-destructive surface analysis does not destroy any data, and you can use it to safely check the condition of your hard disk drive. However, this test does not flag any bad tracks it detects. To start the test, select Non-destructive surface analysis from the Hard Disk Format Menu. You see these messages: Analyze Hard Disk Read/Verify check for all tracks...
Sytem Utilities Additional Utilities The Reference diskette contains the following additional utilities: 0 ESPEED 0 HDSIT. Changing the Processor Speed The computer’s processor can operate at two speeds: high or low. High speed is the highest speed at which the microprocessor is capable of running. Low speed simulates an 8 MHz processor to provide compatibility with older application programs.
C Schematics Contents CPU Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Video Circuitry (Part 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System and Virtual Cache Controller Circuitry. . . . . . . . . . . . . . . . . . . . . . . . . . Peripheral and I/O Controller Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SIMM and Memory Circuitry . . . . . . . . . . . . . . . .
CPU Circuitry Epson NX Service Manual C-3
Video Circuitry ( Part 1 ) Epson NX Sevice Manual C-4
System end Virtual Cache Controller Circuitry Epson NX Servlce Manual G5
Peripheral and I/O Controller Circuitry Epson NX Service Manual C-6
SIMM and Memory circuitry Epson NX Service Manual G7
Wingine/Virtual Memory Controller circuitry Epson NX Sew/w Manual C-8
VGA Feature Circuitry Epson NX Service Manual C-9
Keyboard/Mouse Controller Circuitry Epson NX Service Manual C-10
Riser Board Connector circuitry Epson NX Service Manual C-11
Power Supply and Reset Circuitry Epson NX Service Manual C-12
Supplemental PAL Circuitry Epson NX Service Manual C-13
Video Circuitry (Part 2) Epson NX Service Manual C-14
Index A Abbreviations A-24 Abnormal shut down 2-20 Acronyms, list of A-24 Adaptec SCSI card A-21 A-22 - A-23 jumpers Address map memory 1-15 system I/O A-3 Agency information l-6 B Battery connector l-11, A-13 Beep codes 2-3, 2-6 Bezel removing 3-23 replacing 3-24 BIOS EPROM l-9 removing 3-21 replacing 3-21 1-16 upgrading video B-7 Blank screen 2-8, 2- 11 Boot errors 2-3 problems 2-14 C Cache 1-16 test B-14 Case construction l-9 description l-9 dimensions and weight 1-2 Chip puller 2- 1 Connector pin assi
LED 3-20 LED connector l-11, A-16 mounting rails 3-13 power connector A- 19 problems 2-13 removing 3-123-15 - 3-16 specifications 1-19 Hardware interrupts A-6 HDD LED connector l-11, A-16 HDPMTALL utility B-24 High vertical refresh B-14 I I/O address map A-3 IDE connector l-11, A-10 Installed equipment B-8 Integrated peripheral controller Intel Ethernet card A- 19 Interrupts, hardware A-6 ISA slots l-9 Mounting rails 3- 13 Mouse Connector l-11, A-12 controller 1-9 2-19 problems N Network l-l - l-2, l-4,
removing 3-17 replacing 3-18 shut down 2-8 Power-on diagnostics 2-3, 2-7, B-l Problems blankscreen 2-8, 2- 11 boot 2-14 diskette drive 2-12 general 2-7 hard disk 2-13 keyboard 2-9 lock-up 2-7 monitor 2-10 mouse 2-19 option card 2-17 overheating 2-8 parallel printer 2- 15 power 2-7 screen images 2-11 serial port 2-16 SIMM 2-18 software 2-14 starting 2-8 sticking keys 2-10 video 2-10 Processor installing 3-11 removing 3-11 Processor speed changing B-6 options B-6 Q Quantum l-2, 1-18 - 1-19 jumpers l-20 R R
U Upgrading BIOS 1-16 CPU l-5 v Vertical refresh B-14 VGA BIOS 1-9 feature connector l-11, A-17 l-11 port port connector A-7 Video BIOS B-7 DRAM 1-9, 1-16 Virtual Cache Memory Controller 1-9 z ZIF socket l-2 Index-4 Epson NX Service Manual
