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Maintenance & Service Guide
Presario 1600 Series Portable Computers

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Dip Switch Settings

CAUTION.GIF (182 bytes)

CAUTION:  When replacing the system board, ensure the dip switch voltage settings on the system board are correct for the computer model and processor voltage marked on the processor chip. If the system board dip switch voltage settings are not correct, damage may occur to the computer and/or system board.

Illustration of location of dip switch.

Dip Switch System Board Settings

CPU Core Voltage Setting

Core Voltage

S1-1 S1-2 S1-3

1.2V (Set as Default)

On Off Off
2.2V Off Off On
2.45V Off On Off

Power OK Voltage Setting

Core Voltage S2-1 S2-2 S2-3

1.2V (Set as Default)

On Off Off
2.2V Off Off On
2.45V Off On Off

Bus Frequency Setting

HCLK S2-4
66.6 Mhz (Set as Default) On
66.0 Mhz Off

 

NOTE:

The black area on the dip switch indicates the position of the switch.

 

Bus Ratio Setting

FRACTION

S1-4

S1-5

S1-6

2.0X (133MHZ)

ON

OFF

OFF

2.5X (166MHZ)

ON

ON

OFF

3.0X (200MHZ)

OFF

ON

OFF

3.5X (233MHZ)

OFF

OFF

OFF

4.0X (266MHZ)

ON

OFF

ON

4.5X (300MHZ)

ON

ON

ON

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