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Maintenance and Service Guide Compaq Presario 4900, 5000, & 5100 Series Computers
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| JUMPER & SWITCH INFORMATION 5000 & 5100 Series System Boards (3rd board of 3) For other boards used in the 5000 & 5100 series models, or for the board used in the 4900 series model, click the appropriate link. Click on a jumper designator to get its function and a connector description.
JP1 (CPU clock multiplier)
CPU clock speed | 100 MHz bus | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550
95 MHz bus | 190 | 238 | 285 | 333 | 380 | 428 | 475 | 523
pins 1-2 | on | on | off | off | on | on | off | off
pins 3-4 | off | on | on | off | off | on | on | off
pins 5-6 | off | off | off | off | on | on | on | on
JCK3 (CPU bus speed select)
CPU bus speed (MHz) | 95 | 100
Pins 1-2 | on | off
The factory default settings of the following jumpers are marked with an asterisk. These settings will not normally need to be adjusted.
JCK1 (SDRAM clock source)
CMOS state | CPU clock* | AGP clock
Jumper position | pins 1-2 | pins 2-3
JCK2 (CPU bus clock select)
CMOS state | 66 MHz bus | 95 or 100 MHz bus*
Jumper position | pins 1-2 | pins 2-3
VS1 (CPU pin U33 voltage select)
U33 voltage | 3.3 V* | 3.45 V
Jumper position | pins 1-2 | pins 2-3
JP3 (CPU core voltage select)
VCC2H/L# low | 2.0 | 2.1 | 2.2* | 2.3 | 2.4 | 2.5 | 2.6 | 2.7
VCC2H/L# high | 2.8 | 2.9 | 3.0 | 3.1 | 3.2 | 3.3 | 3.4 | 3.5
pins 1-2 | off | on | off | on | off | on | off | on
pins 3-4 | off | off | on | on | off | off | on | on
pins 5-6 | off | off | off | off | on | on | on | on
Connector information
Function | Description | Reference Designator
Keyboard | Miniature 6-pin | ½J1
Mouse | Miniature 6-pin | ½J1
Parallel port | DSUB 25-pin | J4
Serial port | DSUB 15-pin | J8
Ethernet connector | RJ45 | J2
Flat panel monitor connector | 20-pin DFPP | J3
Video | 15-pin VGA | J5
Microphone in | Mini stereo | ½J7
Speaker out | Mini stereo | ½J6
Line out | Mini stereo | ½J7
Line in | Mini stereo | ½J6
DIMM sockets | 168-pin DIMM | DIMM 1 - 3
SODIMM socket | 144-pin SODIMM | J16
Socket 7 | 321-pin PGA | U25
Socket 7 clock multiplier | 6-pin header | JP1
SDRAM clock source | 3-pin header | JCK1
CPU bus clock select | 3-pin header | JCK2
CPU bus speed select | 2-pin header | JCK3
Battery socket | Battery holder | BAT1
Power supply | 6- and 12-pin ATPWR headers | J15, J12
PCI slots | 32-bit PCI connector | J13, J14
ISA slots | 16-bit ISA connector | J9, J10
CD-ROM audio | 4-pin header, key 2 | J11
IDE drives | 40-pin headers, key 20 | J18, J19
Diskette drive | 34-pin header | J24
Headphone board | 5-pin 2mm connector | J22
Internal speakers | 2-pin header | J20, J21
Game | DSUB 15-pin | J23
CPU core voltage select | 6-pin header | JP3
Second fan | 4-pin header, key 2 | J17
CPU pin U33 voltage select | 3-pin header | VS1
CMOS clear | 3-pin header | JP2
Button board | 5-pin header | J25
Revised: 21 October 1998