Lenovo PC 300GL Technical Information Manual 6272, 6282 - Page 26

Jumpers, Switches

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Chapter 2. System Board Features Jumpers Jumpers on the system board are used for custom configurations. The following figures show the description of pin numbers for specific jumpers. To locate these jumpers, see "System Board" on page 13. Figure 7. J6 CMOS Clear/Password Jumper Pins 1 and 2 2 and 3 Description Normal Clear CMOS/Password Switches The switches (SW1) are used for setting the microprocessor speed and diskette-write protection. The following figure shows the configuration of switches 1-4 for the different microprocessor speeds. Figure 8. Microprocessor Speed (SW1 1-4) Switch 100 MHz 120 MHz 133 MHz 1 Off On On 2 Off Off Off 3 Off On Off 4 On Off On 150 MHz On On On Off 166 MHz On On Off On 200 MHz Off On Off On 233 MHz Off Off Off On The following figure shows the configuration of switch 5 for disabling or enabling the Ethernet controller. Note: This switch is functional only on models with integrated/on-board Ethernet only. Figure 9. Ethernet Disable/Enable (SW1 5) Switch Enabled 5 On Disabled Off Note: This switch should not be used to disable the Ethernet controller under normal conditions. BIOS will disable it if selected in setup. This switch should only be used to aid in diagnosing problems. The following figure shows the configuration of switch 6 for diskette-write protection. Figure 10. Diskette-Write Protection (SW1 6) Switch Diskette Write-Enabled 6 Off Diskette Write-Protected On 14 Technical Information Manual

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Chapter 2.
System Board Features
Jumpers
Jumpers on the system board are used for custom configurations.
The following figures show the
description of pin numbers for specific jumpers.
To locate these jumpers, see “System Board” on
page 13.
Switches
The switches (SW1) are used for setting the microprocessor speed and diskette-write protection.
The following figure shows the configuration of switches 1–4 for the different microprocessor speeds.
The following figure shows the configuration of switch 5 for disabling or enabling the Ethernet controller.
Note:
This switch is functional only on models with integrated/on-board Ethernet only.
Note:
This switch should not be used to disable the Ethernet controller under normal conditions.
BIOS
will disable it if selected in setup.
This switch should only be used to aid in diagnosing problems.
The following figure shows the configuration of switch 6 for diskette-write protection.
Figure 7. J6 CMOS Clear/Password Jumper
Pins
Description
1 and 2
Normal
2 and 3
Clear CMOS/Password
Figure 8. Microprocessor Speed (SW1 1-4)
Switch
100 MHz
120 MHz
133 MHz
150 MHz
166 MHz
200 MHz
233 MHz
1
Off
On
On
On
On
Off
Off
2
Off
Off
Off
On
On
On
Off
3
Off
On
Off
On
Off
Off
Off
4
On
Off
On
Off
On
On
On
Figure 9. Ethernet Disable/Enable (SW1 5)
Switch
Enabled
Disabled
5
On
Off
Figure 10. Diskette-Write Protection (SW1 6)
Switch
Diskette Write-Enabled
Diskette Write-Protected
6
Off
On
14
Technical Information Manual