HP Dc7900 Service Reference Guide: HP Compaq dc7900 Business PC - Page 287
Main Power/Control Panel, Secondary Processor 12V header
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L3 USB rear port choke (2nd) L4 USB rear port choke (3rd) L5 USB front port choke (2nd) P1 P/S connector (20 or 24 pin) P2 Second P/S connector (as required) P3 Processor 12V header P4 Secondary Processor 12V header P5 Main Power/Control Panel P6 Speaker connector P7 Analog audio connector (from CD-ROM) P8 Primary chassis fan header or primary CPU heatsink fan P9 Secondary chassis fan header P10 Diskette drive connector P11 Power supply or rear chassis fan header P12 Alert on LAN connector P13 VRM module footprint P15 AUI connector P16 Fan command/fan sink header (may be 2 or 4 pin) P17 Digital audio expansion header P18 SPDIF internal input header P19 SPDIF internal output header P20 Primary IDE connector P21 Secondary IDE/MultiBay connector P22 Header for NEWCARD P23 Header for front panel audio P24 Header for front panel USB P25 Internal USB connector 1 P26 Internal USB connector 2 P27 MultiBay header P29 SCSI LED connector P30 PCI extender slot (female) P40 Blade PC graphics connector (outboard) P41 Blade PC graphics connector (inboard) P52 Second serial port connector 275