HP 5850 - Deskjet Color Inkjet Printer Reference Manual page 237

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/HDD LED connector
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 Auxiliary Audio connector
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
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