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appendix

G
Component
P/S connector Second P/S connector (as required) Third P/S connector (as required) Main Power HDD LED connector Speaker connector Audio connector (from CD-ROM Second fan connector WOL connector (NIC cable) Diskette drive connector Second Audio connector AUI connector Primary IDE connector Secondary IDE connector Video memory upgrade connector Primary SCSI Connector Secondary SCSI connector ITP connector Primary processor socket Secondary processor socket processor CMOS header Video pass through header Memory slot The first slot populated (DIMM1 or RIMM1) and tested. Following memory slots BNC RJ-45 Jack IEEE 1394 ISA slots PCI slots Riser board Device bay connectors
continued

SYSTEM BOARD AND RISER BOARD REFERENCE DESIGNATORS
Designator
P1 P2 P3 P5 P6 P7 P8 P9 P10 P11 P15 P20 P21 P25 - P26 P30 P31 P100 XU1 XU2 E50 E51 XMM1 XMM2 - XMM5 J6 J7 J8 J10 - 19 J20 -29 J30 J31 - J35

Compaq Deskpro EN Series of Personal Computers

G-1

Reference Designators Continued Designator
J36 J40 J50 J51 J52

Component
AC97 connector AGP First parallel port Second parallel port Double-stacked parallel port Top Port B Bottom Port A First serial port Second serial port Double-stacked serial port Top Serial B Bottom Serial A Keyboard connector (Closest to P/S) Mouse connector Double-stacked mouse/keyboard connector Top Mouse Bottom Keyboard Video connector Single USB connector Double-stacked USB Microphone jack Line-in jack Line-out jack Headphone jack Volume control Double-stacked headphone/microphone connector Top Microphone Bottom Headphone Double-stacked line-in/line-out connector Top Line in Bottom Line out ROM socket

J53 J54 J55

J66 J67 J68

J69 J70 J71 J72 J73 J74 J75 J76 J77

J78

XU15

G-2

System Board and Riser Board Reference Designators