Dell POWEREDGE C6105 - Manual (Page 212)

212 | Jumpers and Connectors
NOTE: Pin 9 and pin 10 of PIC firmware recovery and PS-ON connector are used
for firmware recovery, and pin 1-8 are used for debug when pin 9 and pin 10 are
shorted by jumper.
Power Distribution Board Connectors
Figure 5-13. Power Distribution Board Connectors
1 backplane power connector 2 system fan board connector
3 main power connector for system
board 3 and 4 4 main power connector for system
board 1 and 2
5 system fan board power connector 6 bridge card connector