Acer 930 User manual

ChapterChapter
11
System Board
System Board 1-1
1.1 Features
This high-performance system board supports the Intel Pentium II CPU
running at 233/266/300 MHz. Designed to work with Intel 440LX system
controller, which consists of the PCI/AGP controller (PAC) and the PCI/ISA
IDE accelerator (PIIX4), the CPU carries a new generation of power.
The PAC host bus interface supports up to two Pentium II processors with
66 MHz bus frequency. It also provides a 72-bit DRAM support using both
extended data output (EDO) and synchronous DRAM (SDRAM) DIMMs.
The PAC introduces a new technology, which is the Accelerated Graphics
Port (AGP) interface. Supporting up to 133 MHz data transfer rate, the
AGP interface boosts graphics performance.
The PIIX4 is a multifunction PCI device controller implementing system
functions including PCI-to-PCI bridge, PCI IDE, universal serial bus (USB)
host/hub, and enhance power management. It also supports Ultra DMA/33
synchronous DMA-compatible devices.
The system board utilizes both the ISA and the PCI local bus architecture.
Two ISA and four PCI bus slots (including one PCI/ISA shared slot) reside
on the board to allow installation of either master or slave devices.
Four memory banks composed of 168-pin dual inline memory module
(DIMM) sockets support a maximum system memory of 512 MB using
128-MB DIMMs. The sockets support both EDO and SDRAM-type
DIMMs.
A 50-pin Fast SCSI-II and a 68-pin Wide SCSI interface come with the
system board to connect SCSI devices. Standard I/O features such as two
enhanced IDE drive interfaces, two serial interfaces, one parallel port
interface, a diskette drive interface, and PS/2 mouse and keyboard
connectors reside on the system board.
The system board supports two optional features, the ASM Pro and the
remote diagnostic management (RDM), that allow better server

1-2User’s Guide
management. The ASM Pro detects problems in CPU thermal condition,
CPU working voltage detection (±12V/±5V/3.3V/1.5V), and PCI bus
utilization calculation. It also detects if the CPU fan or the chassis fan
malfunctions. The RDM allows execution of the RDM diagnostic program
from a remote RDM station to fix detected problems or to reboot the system.

System Board 1-3
1.2 Major Components
The system board has the following major components:
• Exclusive slots for two Intel Pentium II processors
• Memory banks (Bank 0 to Bank 3) composed of four 168-pin DIMM
sockets
• Two ISA and four PCI expansion slots (including one PCI/ISA shared
slot)
• 256-KB Flash ROM for system BIOS
• 50-pin Fast SCSI-II and 68-pin Wide SCSI interfaces
• RDM connectors
• ASM controller chipset
• Enhanced IDE hard disk and diskette drive interfaces
• Power connector for 250-watt switching power supply
• System controller chipsets
• External ports:
• USB connector
• Parallel port
• Serial port 1
• Serial port 2
• PS/2-compatible keyboard port
• PS/2-compatible mouse port

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1.2.1 System Board Layout
1 DIMM sockets
2 Pentium II CPU slot 1
3 Pentium II CPU slot 2
4 Accelerated graphics port (AGP)
interface slot
5 Primary IDE connector
6 Secondary IDE connector
7 RDM connectors
8 Battery
9 Narrow SCSI connector
10 Wide SCSI connector
11 ISA slots
12 PCI slots
13 BIOS
14 Diskette drive connector
15 PS/2 keyboard port
16 PS/2 mouse port
17 Serial port 1
18 Parallel port
19 Serial port 2
20 USB connector
Figure 1-1 System Board Layout
2
3
8
4
5
7
10
11
12
13
14
17
16
1
6
15
19
18
20
9

System Board 1-5
1.3 Jumpers and Connectors
1.3.1 Jumper and Connector Locations
Figure 1-2 shows the jumper locations on the system board. The blackened
pin on a jumper represents pin 1.
Figure 1-2 Jumper and Connector Locations
The blackened pin of a jumper or connector
represents pin 1.

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1.3.2 Jumper Settings
Table 1-1 Jumper Settings
Jumper Setting Function
S/W Power Down for
420W SPS
JP1 1-2* 2-3 Enabled Disabled
ITP JP3, JP4
JP3 JP4
1-2, 1-2
2-3*, 1-2*
2-3, 2-3
CPU1
Dual CPU
CPU 2
External Clock
JP6 1-2, 4-5*
2-3, 5-6 66 MHz 60 MHz
BIOS JP8 1-2*
2-3 Acer OEM
Password Security
JP9 1-2
2-3* Check password Bypass password
Sound Output
JP11 1-2*
2-3 Buzzer Speaker
SCSI Termination
JP12 1-2*
2-3 Terminator set to ON SCSI terminator set to ON or OFF
by software
*Default setting

System Board 1-7
Table 1-2 lists the CPU core over bus frequency ratios depending on JP5
settings.
Table 1-2 JP5 Settings for CPU Core/Bus Frequency Ratio
JP5 Settings CPU Core /
1-2 3-4 5-6 7-8 Bus Freq. Ratio
Closed Closed Closed Closed 2
Closed Closed Open Closed 3
Closed Closed Closed Open 4
Closed Open Closed Closed 5/2
Closed Open Open Closed 7/2
Open Open Open Open 2/1
Closed Open Closed Open 9/2

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1.3.3 Connector Functions
Table 1-3 lists the different connectors on the system board and their
respective functions.
Table 1-3 Connector Functions
Connector Function
CN1 250W power control connector
CN2 420W power control connector
CN3 Housing fan connector 1
CN4 Housing fan connector 2
CN5 Backplane hard disk LED connector
CN6 10-pin power connector
CN7 USB connector
CN9 CPU1 fan connector
CN10 CPU1 thermal sensor connector
CN11 Upper: Parallel port
Lower: Serial ports
CN12 250W power supply control connector
CN14 Hard disk LED connector
CN15 Upper: PS/2 keyboard connector
Lower: PS/2 mouse connector
CN16 CPU 2 fan connector
CN17 CPU2 thermal sensor connector
CN18 Diskette drive connector
CN19 Power switch
CN20 Housing fan connector 3
CN21 Enhanced IDE 1 connector
CN22 Power LED connector
CN23 Enhanced IDE 2 connector
CN24 Reset connector

System Board 1-9
Table 1-3 Connector Functions (continued)
Connector Function
CN25, CN28 RDM connectors
CN26 Redundant power status connector
CN27 Wake up ON LAN connector
CN29 Feature connector (for Intel SMM)
CN30 Narrow SCSI connector
CN32 Wide SCSI connector
CN33 Speaker connector
CN31 Housing door connector
1.4 ESD Precautions
Always observe the following ESD (electrostatic discharge) precautions
before installing any system component:
1. Do not remove any system component from its packaging unless you
are ready to install it.
2. Wear a wrist grounding strap before handling electronic components.
Wrist grounding straps are available at most electronic component
stores. DO NOT attempt the procedures in the following
sections unless you are confident of your
capability to perform them. Otherwise, ask a
service technician for assistance.

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1.5 Installing the Processor Heat Sink
and Fan
The Pentium II processor module comes with holes on one side to hold the
clips of the heat sink and fan. The upper set of holes (near the latches) on
the processor are wider and should match the wider ends of the clips on the
heat sink. The lower set of holes are smaller and should match the narrow
ends of the heat sink clips.
Figure 1-3 Matching the Fan-Heat Sink Clips with the Holes on the
Processor
Wide Holes
Narrow Holes
Wide Clip Ends

System Board 1-11
Follow these steps when installing the heat sink and fan to the Pentium II
processor module:
1. Remove the thermal tape protector at the back of the heat sink.
2. Insert the wide clip ends to the wide holes on the processor and the
narrow clip ends to the narrow holes.
Figure 1-4 Inserting the Clip Ends to the Processor Holes
3. Use a screwdriver to press and lock in the wide end of a clip first.
Then without lifting the screwdriver, point it downward to press and
lock the narrow end of the clip. See Figures 5 and 6 for the illustration
of this step.

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Figure 1-5 Locking a Wide Clip End
Figure 1-6 Locking a Narrow Clip End
4. Repeat step 3 to lock the other clip.

System Board 1-13
1.6 Installing a Pentium II Processor
Follow these steps to install the Pentium II processor to the socket on the
CPU board.
1. Place the retention mechanism over the processor socket on the CPU
board. Secure it with the screws that came with the package.
Figure 1-7 Installing the Pentium II Retention Mechanism
2. With the processor module golden fingers pointing downward, align
the processor to the posts of the retention mechanism then lower it
down. See Figure 1-8.
The golden fingers of the Pentium II module is
slotted such that it only fits in one direction.
Make sure that module groove matches the one
on the processor socket.

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3. Press down the processor module until the golden fingers completely fit
into the socket.
Figure 1-8 Installing a Pentium II Processor
4. Press the latches on the sides to lock the processor module into place.
Figure 1-9 Securing the Pentium II Processor

System Board 1-15
1.7 Removing a Pentium II Processor
Follow these steps to remove the Pentium II CPU module from the slot.
1. Unlock the latches the secure that processor module.
Figure 1-10 Unlocking the Module Latches
2. Firmly hold the processor module and pull it out of the socket.
Figure 1-11 Removing the Pentium II Processor

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1.8 Memory Upgrade
The four 168-pin sockets onboard support both extended data output (EDO)
and SDRAM-type DIMMs. You may install 16-MB, 32-MB, 64-MB, or
128-MB DIMMs for a maximum of 512-MB system memory. Each of the
sockets represents one independent bank. This allows you to install DIMMs
with different capacities to form a configuration.
1.8.1 Memory Configurations
Table 1-4 lists some system memory configurations. You may combine
DIMMs with various capacities to form other combinations.
Table 1-4 Memory Configurations
DIMM1 DIMM2 DIMM3 DIMM4 Total Memory
16 MB 16 MB
16 MB 16 MB 32 MB
16 MB 16 MB 16 MB 48 MB
16 MB 16 MB 16 MB 16 MB 64 MB
32 MB 32 MB
32 MB 32 MB 64 MB
32 MB 32 MB 32 MB 96 MB
32 MB 32 MB 32 MB 32 MB 128 MB
64 MB 64 MB
64 MB 64 MB 128 MB
64 MB 64 MB 64 MB 192 MB
64 MB 64 MB 64 MB 64 MB 256 MB
128 MB 128 MB
128 MB 128 MB 256 MB
128 MB 128 MB 128 MB 384 MB
128 MB 128 MB 128 MB 128 MB 512 MB

System Board 1-17
1.8.2 Installing a DIMM
To install a DIMM, align it with the socket and press it down until the
holding clips secure the DIMM in place.
The DIMM socket is slotted to ensure proper
installation. If you slip in a DIMM but does not
completely fit, you may have inserted it the
wrong way. Reverse the orientation of the
DIMM.
Figure 1-12 Installing a DIMM

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1.8.3 Removing a DIMM
To remove a DIMM, press the holding clips on both sides of the socket
outward to release the DIMM.
Place your forefingers on the top of the DIMM
before you press the holding clips to gently
disengage the DIMM from the socket.
Figure 1-13 Removing a DIMM

System Board 1-19
1.8.4 Reconfiguring the System
Reconfigure the system after installing or removing DIMMs.
Follow these steps to reconfigure the system:
1. Reboot the system. A memory error message appears, indicating that
the total memory does not match the value stored in CMOS.
2. Press + + during the power-on self-test (POST)
routine to run Setup. During POST, a message indicating a wrong
memory configuration appears.
3. Press twice to exit Setup and reboot the system. The system boots
with the new memory configuration.

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1.9 VGA/LAN Combo Card (Optional)
The system board supports the VGA/LAN combo PCI card. This allows the
system to support enhanced video and local area network capabilities
through a single card.
The VGA/LAN combo card is an option and may
not be present in all models.
1.9.1 Features
The combo card includes external video (CN3) and LAN (CN4) connectors.
The LAN controller chipset on the card supports the remote “wake-up on
LAN” feature that allows application installation or data access from a
remote system. It is compatible with IEEE 802.3/802.3u 10BASE-T and
100BASE-TX. It also allows back-to-back transmission at 100 Mbps.
The VGA controller chipset supports the ATI multimedia channel 2.0 to
allow video capture through the video decoder and use of video phone, TV
tuner applications, and MPEG decoder for hardware video.