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NEC
PowerMate ML5
Disassembly Manual
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Table of contents
Overview.................................................................................................................................................................3
Technician Notes....................................................................................................................................................3
Disassembly Instructions........................................................................................................................................3
Reassembly Instructions ........................................................................................................................................3
Required Tools .......................................................................................................................................................3
Hazardous Voltage .................................................................................................................................................4
Avoid Electrostatic Discharge.................................................................................................................................4
Power Supply Unit..................................................................................................................................................4
Removing the Stabilisers........................................................................................................................................5
Opening the Chassis ..............................................................................................................................................5
Removing the Riser Board Bracket and the Raiser Board.....................................................................................6
Removing a PCI or CNR Expansion Card .............................................................................................................7
Removing the AGP Expansion Card......................................................................................................................7
Removing the Floppy Disk Drive............................................................................................................................8
Removing the Optical Device Drive........................................................................................................................9
Removing the Hard Disk Drive .............................................................................................................................10
Removing the Power Supply Unit.........................................................................................................................11
Removing the Auxiliary System Fan ....................................................................................................................11
Removing the CPU...............................................................................................................................................12
Removing the Second Serial Port ........................................................................................................................12
Removing the Switch/LED board .........................................................................................................................13
Removing the Internal Speaker............................................................................................................................13
Removing the Motherboard..................................................................................................................................14
Notice ...................................................................................................................................................................15
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Overview
This document contains step-by-step disassembly instructions for the PowerMate ML5 chassis. The instructions are
illustrated where necessary with images of the part that is being removed or disassembled. Furthermore, the screws
that are removed are shown next to the image of the parts themselves.
NEC reserves the right to make changes to the PowerMate ML5 chassis without notice.
Technician Notes
Only technicians authorized by NEC Computers International BV should attempt to repair this equipment. All
troubleshooting and repair procedures are detailed to allow only subassembly/module level repair. Because of the
complexity of the individual boards and subassemblies, no one should attempt to make repairs at the component
level or to make modifications to any printed wiring board. Improper repairs can create a safety hazard. Any
indication of component replacement or printed wiring board modifications may void any warranty or exchange
allowances.
Disassembly Instructions
When disassembling the system unit, follow these general rules:
Do not disassemble the system into parts that are smaller than those specified in the instructions.
Label all removed connectors. Note where the connector goes and in what position it was installed.
Turn off the power and disconnect all power and all options.
Reassembly Instructions
Reassembly is the reverse of the disassembly process. Use care to ensure that all cables and screws are returned
to their proper positions. Check that no tools or any loose parts have been left inside the chassis. Check that
everything is properly installed and tightened.
Required Tools
All disassembly procedures can be performed using the following tools:
Philips screwdriver
Small Philips screwdriver
Small flatbed screwdriver
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Hazardous Voltage
There is hazardous voltage present inside the computer
when it is connected to an AC supply, even when the
computer’s power switch is off. Exposure to hazardous
voltage could cause personal injury. To avoid risk of injury,
contact an Authorized Service Provider for proper
(un)installation of optional hardware devices.
Avoid Electrostatic Discharge
Electrostatic electricity can easily damage circuit cards and
integrated circuits (ICs). To reduce risk of damage, store
them in protective packaging whenever they are not
installed in your system.
Add-in cards can be extremely sensitive to ESD and always
require careful handling. After removing the card from the
computer, place the card flat on a grounded, static-free
surface, component-side up. Use a conductive foam pad if
available, but not the card wrapper. Do not slide the card
over any surface.
Before you install or remove memory modules, video
memory, disk drives, circuit cards or other devices, protect
them from static electricity. To do so, make sure your
computer’s power switch is OFF. Then, unplug the
computer’s AC power cord. Before picking up the device you
(un)install, you should wear an anti-static wrist wrap
(available at electronic supply stores). Be sure to connect
the wrist wrap to an unpainted metal portion of the computer
chassis. As an alternative, you can dissipate electrostatic
build-up by touching an unpainted metal portion of the
computer chassis with one hand. Then touch the device you
are (un)installing with the other hand, and maintain
continuous contact with it until it is (un)installed in the
computer.
Power Supply Unit
Under no circumstances should you attempt to disassemble
the power supply. The power supply contains no userserviceable parts. Inside the power supply are hazardous
voltages that can cause serious personal injury. Always
return a defective power supply to your dealer.
WARNING
Ensure that the computer is disconnected from
its power source and from all
telecommunications links, networks, or modem
lines whenever the chassis cover is removed.
Do not operate the computer with the cover
removed.
AVERTISSEMENT
Assurez-vous que le système est débranché de
son alimentation ainsi que de toutes les
liaisons de télécommunication, des réseaux, et
des lignes de modem avant d’enlever le capot.
Ne pas utiliser le système quand le capot est
enlevé.
WARNUNG
Das System darf weder an eine Stromquelle
angeschlossen sein noch eine Verbindung mit
einer Telekommunikationseinrichtung, einem
Netzwerk oder einer Modem-Leitung haben,
wenn die Gehäuseabdeckung entfernt wird.
Nehmen Sie das System nicht ohne die
Abdeckung in Betrieb.
ADVERTENCIA
Asegúrese de que cada vez que se quite la
cubierta del chasis, el sistema haya sido
desconectado de la red de alimentación y de
todos lo enlaces de telecomunicaciones, de red
y de líneas de módem. No ponga en
funcionamiento el sistema mientras la cubierta
esté quitada.
WAARSCHUWING
Zorg er voor dat alle verbindingen van en naar
de computer (stroom, modem netwerk, etc)
verbroken worden voordat de behuizing
geopend wordt. Zet de computer nooit aan als
de behuizing geopend is.
AVVERTENZA
Prima di rimuovere il coperchio del telaio,
assicurarsi che il sistema sia scollegato
dall’alimentazione, da tutti i collegamenti di
comunicazione, reti o linee di modem. Non
avviare il sistema senza aver prima messo a
posto il coperchio
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Removing the Stabilisers
To remove the stabilisers follow the next steps:
1. Place the computer body with the bottom side protruding a little away from the edge of a
table.
2. Free the locks C and slice the stabilisers as indicated by the arrows A and B, towards the
front of the system for stabiliser A and towards the rear for stabiliser B,.
Fig. 1: Removing the stabilisers
Opening the Chassis
To open the chassis, first remove the stabilisers (see Removing the Stabilisers), then follow
the next steps:
1. Put the chassis in horizontal position, rear side towards you.
2. Unlock the two cover locks shown in the picture below.
Fig. 2: Unlocking the cover of the chassis
3. Slide the cover towards the front of the chassis a few centimetres, then carefully lift the
cover away from the system and set it aside.
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Fig. 3: Removing the cover of the chassis
Note: To prevent damaging the system, make sure no cables or other devices protrude from the
chassis before replacing the cover.
Removing the Riser Board Bracket and the Raiser Board
To remove the riser board bracket first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
1. After removing the cover, put the chassis in the horizontal position, rear side towards you.
2. Hold the riser board bracket by its rear edge (A) and the other end (B) and lift it carefully
until the riser board is disengaged from the PCI slot on the motherboard and the bracket
is disengaged from the tabs marked with the squares in the picture below.
Fig. 4: Removing the riser board bracket
Note: When putting the riser board bracket in place, pay attention to correctly fit the tabs in the latches
marked in Fig. 4: and the raiser board to its slot.
3. Remove the one screw holding the riser board in place
4. Slide the riser board as shown to free it from the latch and put the riser board and the
riser board bracket aside.
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Fig. 5: Removing the riser board
Removing a PCI or CNR Expansion Card
To remove a PCI or CNR expansion card, first remove the stabilisers (see Removing the
Stabilisers), open the chassis (see Opening the Chassis), remove the riser board bracket (see
Removing the Riser Board Bracket and the Riser Board), then follow the next steps:
1. Remove the screw holding the PCI or CNR expansion card in place.
2. Extract the PCI or CNR expansion card from its slot and put it aside.
Removing the AGP Expansion Card
To remove an AGP expansion card, first remove the stabilisers (see Removing the
Stabilisers), open the chassis (see Opening the Chassis), then follow the next steps:
1. Remove the screw holding the AGP expansion card in place.
2. Unlock the AGP expansion card by putting the AGP lock in the unlocked position.
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X1
Fig. 6: Removing an AGP expansion card
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3. Carefully extract the AGP expansion card from its slot and put it aside.
Removing the Floppy Disk Drive
To remove the floppy disk drive, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
1. Remove the one screw securing the floppy disk drive bracket to the chassis.
X1
Fig. 7: Removing floppy disk drive screw
2. Slide the floppy disk drive and its bracket towards the front of the system until the tab
marked in the picture below is free from the corresponding guide.
Fig. 8: Removing the floppy disk drive assembly
3. Carefully disconnect the flat cable from the floppy disk drive and take away the floppy
disk drive assembly.
Fig. 9: Disconnecting floppy disk drive cable
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Note: When reassembling the floppy disk drive, slide the floppy disk drive bracket in the chassis, taking
care that the tabs (A, B, C, D) of the bracket fit perfectly in the corresponding holes of the chassis.
4. Remove the two screws securing the floppy disk drive to the bracket.
Fig. 10: Screws securing the floppy disk drive to the bracket
5. Take the floppy disk drive out of the bracket and put it aside.
Removing the Optical Device Drive
To remove the optical device drive, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
1. Disconnect the cable from the rear of the optical device drive.
2. Push the locking lever towards the optical device drive and pull the whole assembly
outside the front of the chassis.
Fig. 11: Extracting the optical device drive assembly
3. Remove the two screws securing the converter board to the optical device drive bracket,
disconnect the converter board and put it aside.
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Fig. 12: Removing the converter board
4. Remove the two screws securing the optical device drive to its bracket and put it aside.
Fig. 13: Removing the optical device drive from its bracket
Removing the Hard Disk Drive
To remove the hard disk drive, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
Note: The chassis has two bays for hard disk drives. Each bay contains a hard disk drive bracket locked
by a latch
Note: If you want to remove the slave hard disk drive (the upper one), you will have to disconnect also
the IDE cable from the master hard disk drive. This IDE cable is a master/slave cable which is
connected to both hard disk drives. You will not be able to remove the upper hard disk drive if the IDE
cable remains connected to the lower hard disk drive.
1. Disconnect the IDE cable and the power cable corresponding to the drive you want to
remove.
2. Press the latch against the handle of the hard disk drive bracket to unlock it
3. Slide the hard disk drive bracket out of the chassis, and put it aside.
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Fig. 14: Extracting hard disk drive assembly
4. Remove the four screws (two on each side) fixing the hard disk drive to the bracket, slide
the hard disk drive out of the bracket and put it aside.
Fig. 15: Freeing the hard disk drive from the bracket
Removing the Power Supply Unit
To remove the power supply unit, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
1. Disconnect all power connectors from the motherboard and from all peripherals to wich
the power supply unit might be attached.
2. Remove the three screws shown in the picture below.
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Fig. 16: Removing the screws of the power supply unit
3. Slide the power supply unit towards the front of the system and lift it out of the chassis.
Removing the Auxiliary System Fan
To remove the auxiliary system fan, first remove the stabilisers (see Removing the
Stabilisers), open the chassis (see Opening the Chassis), then follow the next steps:
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1. Disconnect the auxiliary fan connector from the motherboard.
2. Remove the screws shown in the picture below. Take the auxiliary system fan out of the
chassis and put it aside.
Fig. 17: Removing the auxiliary system fan
Removing the CPU
To remove the CPU, first remove the stabilisers (see Removing the Stabilisers), open the
chassis (see Opening the Chassis), remove the floppy disk drive (see Removing the Floppy
Disk Drive), then follow the next steps:
1. Disconnect the active sink fan connector from the motherboard.
2. unscrew the four screws shown in the picture below.
Fig. 18: Removing heat sink
3. Carefully lift the heat sink out of the system and put it aside.
4. Lift the lever to unlock the CPU from its socket.
5. Take out the CPU and put it aside.
Removing the Second Serial Port
To remove the second serial port, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis
1. Disconnect the serial cable from the header on the motherboard.
2. Remove the screws shown in the picture below.
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Fig. 19: Removing the second serial port
3. Take the second serial port out of the chassis and put it aside.
Removing the Switch/LED board
To remove the Switch/LED board, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis), then follow the next steps:
1. Disconnect the cable from the Switch/LED board.
2. Remove one screw.
3. Carefully remove the Switch/LED board from the chassis and put it aside.
X2
Fig. 20: Removing the Switch/LED board
Note: To remove also the cable of the Switch/LED board, the IDE cables must be disconnected from the
motherboard, as they cover the cable of the Switch/LED. In order to easily reach the IDE cables it is
better to first remove the floppy disk drive (see Removing the Floppy Disk Drive
).
Removing the Internal Speaker
To remove the internal speaker, first remove the stabilisers (see Removing the Stabilisers),
open the chassis (see Opening the Chassis
1. Remove the screws and the connector shown in the picture
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Fig. 21: Removing the internal speaker
2. Take the speaker off the chassis and put it aside.
Removing the Motherboard
To remove the motherboard, first remove the stabilisers (see Removing the Stabilisers), open
the chassis (see Opening the Chassis
Riser Board Bracket and the Raiser Board), if present remove the AGP expansion card (see
Removing the AGP Expansion Card
Auxiliary System Fan), remove the floppy disk drive (see Removing the Floppy Disk Drive),
remove the power supply unit (see Removing the Power Supply Unit
steps:
1. Remove any memory module present on the motherboard.
2. Disconnect the floppy disk drive cable and the IDE cable from the motherboard.
3. Disconnect the LED/Switch connector from the motherboard
4. Disconnect the serial port cable from the header on the motherboard.
5. Remove the four screws shown in the picture below.
), remove the riser board bracket (see Removing the
), remove the auxiliary system fan (see Removing the
), then follow the next
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Fig. 22: Removing the motherboard
6. Carefully lift the motherboard out of the chassis and put it aside.
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Notice
The information in this guide is subject to change without notice.
This guide contains information protected by copyright. No part of this guide may be photocopied or reproduced in
any form or by any means without prior written consent from NEC Computers International BV.
NEC COMPUTERS INTERNATIONAL BV SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL ERRORS
OR OMISSIONS CONTAINED HEREIN; NOR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING
FROM THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.
Copyright © 2003 NEC Computers International BV. All rights reserved.
NEC is a trademark of NEC Computers International BV.
The names of actual companies and products mentioned herein may be trademarks and/or registered trademarks
of their respective owners.
The software described in this guide is furnished under a license agreement or nondisclosure agreement. The
software may be used or copied only in accordance with the terms of the agreement.
PowerMate ML5 Disassembly Manual
Author: Vincenzo D'Apice
First Edition: January 2003
Document Part Number: NECDOCS05530100
Version: 1.0
NEC
A division of NEC Computers International BV
NEC PowerMate ML5 Disassembly Manual
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