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Maintenance & Service Guide
Presario 7800 Series and 5900T Personal Computers

Presario 7800 and 5900T Models with Pentium III System Board

Jumper & Switch Information

jprswtch.jpg (153668 bytes)

Number Function Description Reference Designator
1 Secondary IDE Drive 40-pin J13
2 Diskette Drive 34-pin J14
3 Primary IDE Drive 40-pin J12
4 Not used
5 Secondary fan connector J20
6 Button Board 20-pin J10
7 CMOS 3-pin JP1
8 Battery Socket Battery holder BT1
9-13 PCI Slots 32-bit PCI connector PCI 1 to 5
14 AGP Slot Connector AGP1

15

 Slot 1 321-pin PGA J18
16 Front side bus four, 2-pin jumpers JP5-7*
17 Heat sink fan connector 3-pin J15
18-20 DIMM Sockets 168-pin DIMM DIMM 1 to 3
21 IEEE 1394 10-pin JP3
22 Front I/O panel 10-pin JP4
23 Single front I/O panel 30-pin J11**
24 Mouse Miniature 6-pin J1
25 Keyboard Miniature 6-pin J1
26 Back USB Dual 4-pin J2
27 Serial Port DSUB 9-pin J4
28 Parallel Port DSUB 25-pin J21
29 IEEE 1394 Connector 6-pin J7
Fan 3-pin
Power Supply 20-pin J9
Clock Multiplier 3, 2-pin JP2


* JP7 always set to the ON position. JP5, JP6, and JP8 always set to the OFF position.

** Single front I/O panel and USB and IEEE1394 connectors are not used concurrently.

 

Jumper Settings

Clearing CMOS JP1
CMOS Normal CMOS Clear
pins 1-2 pins 2-3

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Frequency Selection (JP2)
Multiplier Pin (1-2) Pin (3-4) Pin (5-6) Pin (7-8) FSB 66 MHz FSB 100 MHz FSB 133 MHz
2 ON ON ON ON 133 200 266
3 ON OFF ON ON 200 300 400
4 OFF ON ON ON 266 400 533
5 OFF OFF ON ON 333 500 667
5/2 ON ON OFF ON 166 250 333
7/2 ON OFF OFF ON 233 350 466
9/2 OFF ON OFF ON 300 450 600
11/2 OFF OFF OFF ON 366 550 733
6 ON ON ON OFF 400 600 800
7 ON OFF ON OFF 466 700 933
8 OFF ON ON OFF 533 800 1066
Reserved OFF OFF OFF OFF *** *** ***
13/2 ON ON OFF OFF 433 650 866
15/2 ON OFF OFF OFF 500 750 1000
3/2 OFF ON OFF OFF 100 150 200
2 OFF OFF OFF OFF 133 200 266

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