Dell INSPIRON 4100, 180, POWEREDGE 200 User Manual

Dell

®

PowerEdge

®

4100/180 and 4100/200 Systems

SERVICE MANUAL

®

Information in this document is subject to change without notice.

 1995–1996 Dell Computer Corporation. All rights reserved.

Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and PowerEdge are registered trademarks of Dell Computer Corporation; Intel, Pentium, and LANDesk are

registered trademarks of Intel Corporation; IBM is a registered trademark of International Business Machines Corporation; MS-DOS is a registered trademark of
Microsoft Corporation.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer
Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

November 1996 P/N 58562

Chapter 1

System Overview

The Dell

upgradable server systems, which use the Intel® Pentium® Pro family of
microprocessors. PowerEdge 4100 systems incorporate the high-performance
peripheral component interconnect (PCI) local bus as well as the extended
industry-standard architecture (EISA) expansion bus. These buses are built into
the system board, which integrates the microprocessor(s) and other elements of the
basic computer system.

PowerEdge 4100 systems may have one or two Pentium Pro microprocessors.
The systems have been designed for better serviceability and increased reliabil­ity, with optional redundant power supplies, RAID capability, hot-pluggable
SCSI hard-disk drives, thermal and power supply monitoring, redundant fans,
and ECC memory. The PowerEdge 4100 systems are freestanding or can be
rackmounted to integrate your servers. The microprocessor modules are
installed in zero insertion force (ZIF) sockets on the system board, which allow
you to replace microprocessors faster. Contact Dell for information about Dell­supported microprocessor upgrades.

The Pentium Pro microprocessor contains a built-in clock multiplier circuit,
which increases the microprocessor’s internal operating frequency to a multiple
of the system clock frequency. The microprocessors for each of these systems
and their operating frequencies are as follows:

®

PowerEdge

®

4100 systems covered in this manual are high-speed,

• Dell PowerEdge 4100/180 system — 180 MHz derived from a system clock

frequency of 60 MHz

• Dell PowerEdge 4100/200 system — 200 MHz derived from a system clock

frequency of 66 MHz

System Features

In addition to the standard features found in a traditional personal computer,
Dell PowerEdge 4100 systems include the following new and/or advanced
features:

• 256 KB (PowerEdge 4100/180 systems) or 512 KB (PowerEdge 4100/200

systems) of cache memory internal to the Pentium Pro module

• 64 MB of 72-bit wide, buffered, extended data output (EDO) main memory,

upgradable to 1024 MB (1 GB)

• Hot-pluggable SCSI backplane supporting up to six hard-disk drives

• Optional, redundant hot-pluggable power supplies

System Overview 1-1

• Error correction code (ECC) feature built into the memory controller on the

system board

• Advanced combination EISA and PCI expansion subsystem

• Five PCI and three EISA expansion-card slots (none shared)

• Integrated VGA-compatible video subsystem attached to the PCI bus, with

1 MB video memory standard

• BIOS in upgradable flash memory attached to the EISA bus

• Integrated super I/O controller attached to the EISA bus, provides a

bidirectional parallel port, two serial ports, and the diskette drive interface

• Integrated ultra-wide and ultra-narrow SCSI controllers

• Integrated server management circuitry that monitors critical system volt-

ages and temperatures, as well as the operation of the system cooling fans

• CD-ROM drive standard in an externally accessible drive bay

• Recessed power and reset buttons to prevent accidental system interruptions

• New quick-test feature in the system diagnostics

All of these features, except the new quick-test feature, are briefly described in
this chapter. (For more information about the Quick Test option in the CD-ROM
based diagnostics, see “Running the System Diagnostics” in Chapter2.) For a complete
list of system features, see “Technical Specifications” found later in this chapter.

For information about installing the PowerEdge 4100 systems in a rack, see the
“Dell PowerEdge 4100 and 6100 Systems Rack Kit Installation Guide”
(P/N 40722).

1-2 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

back of computer

left side

front of computer

right side

Figure 1-1. Computer Orientation

NOTE: When following the text in this manual, assume that the location or
direction relative to the system is as shown in Figure 1-1.

System Overview 1-3

reset button

activity indicator

fault indicator

online indicator

power button and
power-on indicator

diskette-drive access
indicator (typical)

SCSI hard-disk drive

SCSI hard-disk drive

SCSI hard-disk drive

Figure 1-2. Front-Panel Features

CAUTION: To avoid possible data or file structure corruptions, the front­panel reset button should be used only when restarting the system with a
key combination fails. Before using the reset button to initiate a hardware
reset, close any open application programs and files if possible. If you are
using MS-DOS®, the system can be rebooted by pressing

<Ctrl><Alt><Del>.

1-4 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

expansion slots

external drive bays (4)

control panel

internal drive
bays (6)

system board

microprocessor sockets

cooling fan connectors (3)
(cooling fans are located
behind the air intake panel)

Figure 1-3. Front/Left Internal View

hard-disk drive
security lock

air intake panel

System Overview 1-5

external drive bays (4)

diskette interface
cable (ultra-narrow)

SCSI interface
connector (ultra-wide)

internal drive bays (6)

SCSI backplane board

SCSI power connector

server
management
connector

control panel connector

power supply (optional)

power supply

SMB connector

SCSI connector port

Figure 1-4. Back/Right Internal View

1-6 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

AC power receptacle

security cable slot

keylock

power supply
(optional)

cable strain relief

power supply

red LED

keylock

video connector

server-management
serial port connector

parallel port connector

serial port 2 connector

serial port 1 connector

mouse connector

green LED

Figure 1-5. I/O Panel

SMB connector

keyboard connector

SCSI connector port

System Overview 1-7

System Memory

The PowerEdge 4100 systems have a minimum of 64 MB of 72-bit-wide, buff­ered EDO memory. The system memory capacity can be expanded to 1024 MB
(1 GB) by using combinations of 32- and 128-MB buffered, EDO dual in-line
memory modules (DIMMs) having gold connectors.

The system board has eight 168-pin DIMM sockets. The socket population rules
for the DIMMs are as follows:

• Populate the DIMM sockets in order from DIMM A (upper) to DIMM H

(lower).

• The DIMMs should be obtained from Dell to guarantee compatibility. All

system memory operates at the speed of the slowest DIMM installed.

• DIMMs of both capacities can be installed in the system. However, the

larger-capacity DIMMs should be installed in the top sockets, beginning
with socket DIMM A, with the smaller-capacity DIMMs installed after­wards in order toward socket DIMM H.

The 72-bit wide, buffered EDO DIMMs support the ECC feature, which detects
memory errors and corrects single-bit memory errors. The ECC feature pro­vides more reliable memory and less downtime, and is built into the memory
controller on the system board.

See “DIMMs” in Chapter 4 for information on removing and replacing DIMMs.

Advanced Expansion Subsystem

The computer system offers advanced expansion subsystems that can support a
mixture of traditional EISA expansion cards, Plug and Play ISA expansion cards,
and PCI expansion cards. The EISA Configuration Utility, included with the system,
provides a means of avoiding resource conflicts that might arise from such an
arrangement.

After all legacy cards have been configured with the EISA Configuration Utility ,
the system automatically assigns required memory space, IRQ lines, and DMA
channels to any installed Plug and Play ISA expansion cards and PCI expansion
cards the next time the system is rebooted. Chapter 5, “Using the EISA Config­uration Utility,” in the Dell PowerEdge 4100/180 and 4100/200 Systems User’s
Guide describes the EISA Configuration Utility and provides instructions for using it
to configure the system.

The eight expansion-card slots include three EISA expansion-card connectors
and five PCI expansion-card connectors. The expansion-card connectors are
located on the system board (see Figure 1-18).

Integrated Server Management

The system board contains integrated server management circuitry that moni­tors critical system voltages and temperatures, as well as the operation and
speed of the system cooling fans. The integrated server management circuitry
works in conjunction with the Intel LANDesk® Server Management suite.

1-8 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

Video Controller

The video subsystem is built into the system board and consists of a high-speed,
high-resolution, VGA-compatible video subsystem. The video controller is con­nected to the PCI local bus. The standard video subsystem contains 1 MB of
DRAM memory (the video memory size is not upgradable).

Maximum noninterlaced resolutions are 640 x 480 pixels with 16.7 million col­ors, 800 x 600 pixels with 65,536 colors, and 1024 x 768 pixels with 256 colors.

Integrated SCSI Controllers

A built-in Adaptec 7880 Ultra/Wide SCSI controller provides an ultra-wide fast
SCSI interface via a 68-pin connector on the system board. This SCSI controller
attaches to the PCI bus to provide a high-performance SCSI bus and also con­trols the six SCSI hard-disk drives in the SCSI hard-disk drive bays. In the
standard Dell PowerEdge 4100 system configuration, the Ultra/Wide SCSI host
adapter on the system board controls the SCSI backplane board. When used in
combination with an optional PowerEdge Expandable RAID Controller host
adapter card, the SCSI backplane board allows you to remove and insert hard­disk drives without shutting down the system. External hard-disk drives are not
supported by the built-in SCSI controller.

A built-in Adaptec 7860 Ultra/Narrow SCSI controller provides a SCSI inter­face via a 50-pin connector to the CD-ROM drive in the externally accessible
drive bay and to any other SCSI drives installed in the other two bays.

SCSI Hard-Disk Drives

Six internal hot-pluggable hard-disk drive bays are located under the externally
accessible drive bays at the front of the computer (see Figure 1-4). These bays can
contain up to six 1- to 1.6-inch-high SCSI hard-disk drives (either fast/wide or ultra
[fast] wide).

NOTES: The externally accessible drive bays at the front of the computer are
normally used for diskette drives, CD-ROM drives, and/or tape drives. Hard­disk drives should be installed in the SCSI hard-disk drive bays. For detailed
information about installing externally accessible drives, see Chapter 9, “Installing
Drives in the External Bays,” in the Dell PowerEdge 4100/180 and 4100/200 Sys-
tems Installation and Troubleshooting Guide. For detailed information about
installing SCSI hard-disk drives, see Chapter 10, “Installing Drives in the Internal
Bays,” in the Installation and Troubleshooting Guide.

Dell supports the drives it furnishes.

SCSI Configuration Guidelines

Although SCSI devices are installed essentially the same way as other devices,
their configuration requirements are different. To configure your SCSI sub­system, follow the general guidelines offered in the following subsections.

System Overview 1-9

SCSI ID Numbers

Each device attached to the 7860 Ultra/Narrow SCSI host adapter must have a
unique SCSI ID number from 0 to 7. For additional SCSI addressing informa­tion, see Chapter 10, “Installing Drives in the Internal Bays,” in the Installation
and Troubleshooting Guide.

When narrow SCSI devices are shipped from Dell, the default SCSI ID numbers
are assigned as follows:

• The computer’s built-in Ultra/Narrow SCSI host adapter is configured

through the BIOS as SCSI ID 7.

• A SCSI CD-ROM drive (installed in an externally accessible drive bay) is

configured as SCSI ID 5.

• A SCSI tape drive (if installed) is configured as SCSI ID 6.

NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or
that devices be attached to the cable in order by ID number.

Devices attached to the Ultra/Wide SCSI host adapter need no ID settings or ter­mination; ID settings and termination are handled automatically by the SCSI
backplane.

Device Termination

SCSI logic requires that termination be enabled for the two devices at opposite
ends of the SCSI chain and disabled for all devices in between. Therefore,
regardless of whether you are installing internal or external devices, use the fol­lowing guidelines:

• A single SCSI device (such as the standard CD-ROM drive) is terminated.

• If two or more SCSI devices are installed, connect the devices as follows:

— Attach one of the devices to the end connector on the SCSI cable, and leave the

terminator enabled on that device.

— The other end of the SCSI cable connects to the computer’s built-in Ultra/Narrow

SCSI host adapter or to an optional SCSI host adapter card, which needs no
termination.

— Disable the terminators on all other devices you attach to the cable.

The standard SCSI CD-ROM drive is configured as the last device on the SCSI
cable. Therefore, any additional devices attached to the cable should have their
terminators disabled.

See the documentation provided with the SCSI device for information on dis­abling the device’s terminator.

1-10 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

System Unit

The following subsections provide service-related information about the system
unit.

System Power Supply

The 500-W system power supply can operate from an AC power source of 90 to
265 VAC at 50 or 60 Hz. When the power-supply paralleling board is installed,
the power supplies are hot-pluggable. When the red LED on the power supply is
lit (except during power-up), it indicates that the power supply has failed (see
Figure 1-5). When the green LED is lit, it indicates that +5 VDC is on. The sys­tem power supply provides the DC operating voltages and currents listed in
Table 1-1.

NOTE: The power supply produces DC voltages only under its loaded condi­tion. Therefore, when you measure these voltages, the DC power connectors
must be connected to their corresponding power input connectors on the system
board or drives.

.

Table 1-1. DC Voltage Ranges

Maximum Output

Voltage Range

Current

+3.3 VDC +3.135 to +3.465 VDC 15.0 A
+5 VDC +4.90 to +5.25 VDC 50.0 A
+12 VDC +11.40 to +12.60 VDC 25.0 A
–12 VDC –10.80 to –13.20 VDC 0.3 A
–5 VDC –4.50 to –5.50 VDC 0.3 A
+5 VFP

1

Maximum continuous DC output power shall not exceed 500 W.

2

VFP (volts flea power) — sometimes called “standby power.”

2

+4.85 to +5.36 VDC 0.25 A

1

System Overview 1-11

Pin Assignments for the DC Power Connectors (Nonredun­dant Systems)

The power-supply output voltages for nonredundant systems can be measured
at the connectors on the back of the power supply (P1, P2, P3, P4, and P5) or at
the connectors on the power connector panel (J11, J12, J13, J14, and J15). The
following illustrations show both sets of connectors.

P2

P1

P5

P4

P3

Figure 1-6. Power Supply Connectors

J12 (P2)
J11 (P1)

J15 (P5)
J14 (P4)

J13 (P3)

Figure 1-7. Power Connector Panel

1-12 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

+5 VDC (red)

–5 VDC (white)

common (black)

common (black)

common (black)

PSON# 1(gray)

J11 (P1)

+5 VDC (red)

common (black)

+5 VDC sense (red)

–sense (black)

PWRGOOD 2 (orange)

+5 VFP (purple)

13

14 15 16 17 18 19 20 21 22

6

1 2 3 4 5 9 10

7

8

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

+5 VDC (red)

+3.3 VDC (orange)
+3.3 VDC (orange)

23 24

11 12

+3.3 VDC (orange)
+3.3 VDC sense (orange)

common (black)

common (black)

-12 VDC (blue)
+12 VDC (yellow)

1

Pin 13 — PSON# should measure between +4 and +5 VDC except when the power button on the front
panel is pressed, taking PSON# to its active-low state.

2

Pin 5 — PWRGOOD should measure between +4 and +5 VDC when the power supply is on and oper-

ating to indicate that all power-supply output voltages are within the ranges specified in Table 1-1.

Figure 1-8. DC Power Connector J11 (P1)

System Overview 1-13

+5 VDC (red)

common (black)
common (black)

common (black)
common (black)

J12 (P2), J13 (P3),
J14 (P4)

10

11 12 13 14

15 16

common (black)

common (black)

common (black)

+5 VDC (red)

17 18

1 2 3 4 5 6 7

+5 VDC (red)

+3.3 VDC (orange)

+12 VDC (yellow)

+5 VDC (red)

+5 VDC (red)

8 9

+3.3 VDC (orange)
+12 VDC (yellow)

+3.3 VDC (orange)
+5 VDC (red)

Figure 1-9. DC Power Connectors J12 (P2), J13 (P3), and J14 (P4)

+SW1
+12 VDC (red)

+3.3 VDC (orange)

Fail LED cathode (red)

Good LED cathode (green)

6 7 8 9 10

J15 (P5)

1

2 3 4 5

Figure 1-10. DC Power Connector J15 (P5)

1-14 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

Good LED anode (green)
Fail LED anode (red)
+5 VDC (red)
+FAN_TACH (gray)

+SW1

DC Power Distribution (Nonredundant System)

Figures 1-11 provides information about DC power distribution for the
nonredundant PowerEdge 4100 system.

power

supply # 1

P1–5

PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+3.3 VDC

power
connector
panel

P1

NRLED
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC

+3.3 VDC

P2

+12 VDC
+5 VDC

+3.3 VDC

P3

+12 VDC
+5 VDC
+3.3 VDC

DDBP

+12 VDC
+5 VDC

FD1–4

+12 VDC
+5 VDC

system board

management

PWRGOOD

PSON#

+5 VFP
+5 VDC

–5 VDC

+12 VDC

–12 VDC
+3.3 VDC

main memory
sockets

DIMM A
through
DIMM H

+3.3 VDC

core VCC (+2.1 to +3.5 VDC)

PROCESSOR1
and
PROCESSOR2

power

logic

RTC/

NVRAM

P6 signal terminators

keyboard
controller

processor

core

regulator (2)

+1.5 VDC

battery

+3.3 VDC
+5 VDC
+12 VDC

–12 VDC

+5 VDC
–5 VDC
+12 VDC

–12 VDC

battery (+3 VDC)

+3.3 VDC

+5 VFP

PWRGOOD

+5 VFP to SCSI backplane

+12 VDC
+12 VDC
+12 VDC

fuse

+5 VDC

+5 VDC

GTL

regulator

PCI4
through
PCI8

EISA1
through
EISA3

REMOTE

FAN1

FAN2
FAN3

MOUSE

KEYBOARD

NOTE: A server management cable
(16-pin) carries the +5 VFP from
the system board to the SCSI
backplane. The control panel cable
(30-pin) carries the +5 VFP from
the backplane to the control panel.

6

3 X 6 LEDs

SCSI backplane
(six drive bays)

5

4

3

control panel

+5 VFP from SCSI backplane

Figure 1-11. Power Distribution (Nonredundant System)

2

reset

1

on/off

CD-ROM

power-on
LED

FLOPPY

speaker

System Overview 1-15

Pin Assignments for the DC Power Connectors (Redundant
Systems)

The power-supply output voltages for redundant systems can be measured at the
connectors on the power-supply paralleling board (PWR1, PWR2, PWR3,
PWRSCSI, and PWRFD) or at the connectors on the end of the wire bundles
extending from these connectors (PWR1, PWR2, PWR3, DDBP, and
FD1–FD4).

PWR1

PWRFD
(FD1–FD4)

PWR2

PWR3

PWRSCSI

diagnostics port

(DDBP)

Figure 1-12. Power-Supply Paralleling Board Connectors

1-16 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

NC_3INH

+3.3 VDC (orange)

common (black)

common (black)

POWER_GOOD (gray)

common (black)

+5 VFP (violet)

PWR1

10

11 12 13 14

15 16

+3.3 VDC sense (orange)

-3.3 VDC sense (black)

FAN_TACH (gray)

NC_NRLED

17 18

1 2 3 4 5 6 7

-12 VDC (blue)

-5 VDC (white)

PWR_STAT_BIT (gray)

I 2C_SDA (gray)

I 2C_SCL (gray)

Figure 1-13. DC Power Connector PWR1

common (black)

+12 VDC (yellow)

common (black)

+12 VDC (yellow)

11

12 13 14 15 16

PWR2,
PWR3

17 18 19 20

8 9

BAT_V (gray)

PRES_DET (gray)
NC_+12 sense

+5 VDC sense (red)

+3.3 VDC (orange)
common (black)

+3.3 VDC (orange)

common (black)

Figure 1-14. DC Power Connector PWR2 and PWR3

+5 VDC (red)

common (black)

+5 VDC (red)

common (black)

+5 VDC (red)

1 2 3 4 5 9 10

6 7

8

common (black)

+5 VDC (red)

common (black)
+5 VDC (red)
common (black)

System Overview 1-17

common (black)

common (black)

+12 VDC (yellow)

common (black)
common (black)

common (black)
common (black)
common (black)

8

9 10 11 12

13 14

PWRSCSI
(DDBP)

1 2 3 4 5 6 7

+12 VDC (yellow)

+5 VDC (red)

+12 VDC (yellow)

+5 VDC (red)

+12 VDC (yellow)

+5 VDC (red)

+12 VDC (yellow)

Figure 1-15. DC Power Connector PWRSCSI (DDBP)

common (black)
common (black)
+5 VDC (red)

2

5 6 7

8

PWRFD
(FD1–FD4)

1

1

2 3

1

Wires 1 through 4 are connected to FD1 and FD2.

2

Wires 5 through 8 are connected to FD3 and FD4.

4

+5 VDC (red)
common (black)

common (black)
+12 VDC (yellow)

Figure 1-16. DC Power Connector PWRFD (FD1–FD4)

1-18 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

DC Power Distribution (Redundant System)

Figures 1-17 provides information about DC power distribution for the redun­dant PowerEdge 4100 system.

power

supply # 1

power

supply # 2

P1–5

POK

PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC

+3.3 VDC

P1–5

PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC

+3.3 VDC

PWR1

BATV
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC

+3.3 VDC

PWR2

+12 VDC
+5 VDC

+3.3 VDC

PWR3

+12 VDC
+5 VDC

+3.3 VDC

PWRSCSI
(DDBP)

+12 VDC
+5 VDC

PWRFD
(FD1–4)

+12 VDC
+5 VDC

system board

BATV
PWRGOOD

PSON#

+5 VFP
+5 VDC

–5 VDC

+12 VDC

–12 VDC

+3.3 VDC

main memory
sockets

DIMM A
through
DIMM H

+3.3 VDC

power

management

logic

RTC/

NVRAM

keyboard
controller

battery

+3.3 VDC
+5 VDC
+12 VDC

–12 VDC

+5 VDC
–5 VDC
+12 VDC

–12 VDC

battery (+3 VDC)

PWRGOOD

+5 VFP to SCSI backplane

fuse

processor

core

regulator (2)

+3.3 VDC

+5 VFP

+12 VDC
+12 VDC
+12 VDC

+5 VDC

+5 VDC

PCI4
through
PCI8

EISA1
through
EISA3

REMOTE

FAN1

FAN2
FAN3

MOUSE

KEY­BOARD

power-supply
paralleling board

NOTE: A server management cable
(16-pin) carries the +5 VFP from
the system board to the SCSI
backplane. The control panel cable
(30-pin) carries the +5 VFP from
the backplane to the control panel.

PROCESSOR 1
and
PROCESSOR 2

core VCC (+2.1 to +3.5 VDC)

P6 signal terminators

SCSI backplane
(six drive bays)

6

5

4

control panel

+5 VFP from SCSI backplane

3 X 6 LEDs

Figure 1-17. Power Distribution (Redundant System)

3

+1.5 VDC

2

reset

1

on/off

GTL

regulator

power-on
LED

CD-ROM

FLOPPY

speaker

System Overview 1-19

System Board Layout

socket (PROCESSOR2)

The subsections that follow provide service-related information
about the system board components.

diskette/tape drive interface
connector (FLOPPY)

EISA connectors
(EISA1 [top], EISA2,
and EISA3)

PCI connectors
(PCI4 [top]–PCI8)

battery connector
(BATTERY)

video connector
(MONITOR)

server-management
serial port connector
(REMOTE)

parallel port connector
(PARALLEL)

serial port 2 connector
(SERIAL2)

serial port 1 connector
(SERIAL1)

mouse connector
(MOUSE)

keyboard connector
(KEYBOARD)

Ultra/Narrow SCSI host adapter
connector (SCSI2 CD-ROM)

secondary microprocessor

Ultra/Wide SCSI host adapter
connector (BACKPLANE SCSI1)

power supply
connector (POWER2)

power supply
connector (POWER1)

front of
system board

DIMM sockets
(DIMM A [top]–DIMM H)

fan connectors
(FAN1, FAN2, FAN3)

speed and configuration
jumpers

primary microprocessor
socket (PROCESSOR1)

power supply connector
(POWER3)

server-management bus
connector (SMB BACKPLANE)

Figure 1-18. System Board Components

1-20 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

Main Memory

The eight DIMM sockets on the system board can accommodate combinations
of 32- and 128-MB DIMMs up to a total memory capacity of 1024 MB (1 GB).
The system is shipped with high-speed (60-ns) 3.3-V EDO DIMMs installed.
When reinstalling DIMMs, use the following guidelines:

• Install a DIMM in socket DIMM A before socket DIMM B, in socket

DIMM B before socket DIMM C, and so on.

• If you are installing DIMMs of different sizes, install them in order of

decreasing capacity, beginning with socket DIMM A.

• DIMMs need not be installed in pairs, but gold connectors are required.

See “DIMMs” in Chapter 4 for information on removing and replacing DIMMs.

System Board Jumpers

jumpered

unjumpered

Figure 1-19. System Board Jumpers

System Overview 1-21

Table 1-2. Jumper Descriptions

Jumper Description Default Setting

EISA EISA Configuration Utility Not installed (utility settings are

retained at system boot)
VGA Integrated video controller Installed (controller is enabled)
PASSWD Password enable/disable Installed (password feature

enabled)
CRDBIOS Reserved Not installed (reserved; do not

change)
RSRVD2

RSRVD1

Reserved Not installed (reserved; do not

change)
200MHZ Microprocessor speed Installed only if the micro-

processor’s internal speed is

200 MHz
180MHZ Microprocessor speed Installed only if the micro-

processor’s internal speed is

180 MHz

Interrupt Assignments

Table 1-3. Interrupt Assignments

IRQ Line Used/Available

IRQ0 Generated by system timer
IRQ1 Generated by keyboard controller to indicate that keyboard’s

output buffer is full

IRQ2 Generated internally by interrupt controller to enable IRQ8

through IRQ15

IRQ3
and
IRQ4

Generated by super I/O controller to indicate that device con­nected to corresponding serial port requires service (IRQ3 for
COM2 or COM4; IRQ4 for COM1 or COM3)

IRQ5 Available for use by expansion card unless this IRQ line is used by

secondary parallel port

IRQ6 Generated by super I/O controller to indicate that diskette drive

requires service

IRQ7 Generated by super I/O controller to indicate that device con-

nected to parallel port requires service
IRQ8 Generated by keyboard controller for each tick of RTC
IRQ9 Available for use by expansion card

1-22 Dell PowerEdge 4100/180 and 4100/200 Systems Service Manual

Table 1-3. Interrupt Assignments (continued)

IRQ Line Used/Available

IRQ10 Available for use by expansion card
IRQ11 Available for use by expansion card
IRQ12 Generated by keyboard controller to indicate that mouse’s output

buffer is full
IRQ13 Generated by math coprocessor to indicate coprocessor error
IRQ14 Available for use by expansion card
IRQ15 Available for use by expansion card

DMA Channel Assignments

Table 1-4. DREQ Line Assignments

DREQ Line Used/Available

DREQ0 Available
DREQ1 Available
DREQ2 Generated by super I/O controller to initiate DMA cycle for

attached diskette drive
DREQ3 Available
DREQ4 Generated by bus controller chip to activate second DMA

controller
DREQ5 Available
DREQ6 Available
DREQ7 Available

System Overview 1-23