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24 pin MiniFit Jr 5557-24 female (MOLEX 39-01-2240) connector layout
24 pin MiniFit Jr 5557-24 female (MOLEX 39-01-2240) connector

The following figure shows the P1 (24 pin) DC power connector.

Pin Function Pin Function
1 +5 VDC (red) 13 PSON# (gray)
2 Common (black) 14 Common (black)
3 +5 VDC (red) 15 Common (black)
4 Common (black) 16 Common (black)
5 PWRGOOD (orange) 17 N/C
6 +5 VFP (purple) 18 +5 VDC (red)
7 +12 VDC (yellow) 19 +5 VDC (red)
8 -12 VDC (blue) 20 +5 VDC (red)
9 Common (black) 21 TFSC (brown)
10 Common (black) 22 +5 VDC (red)
11 +3.3 VDC (blue/white) 23 +3.3 VDC (blue/white)
12 +3.3 VDC (blue/white) 24 Common (black)

Pin 5 - PWRGOOD is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation.

Pin 13 - PSON# is activated by pressing and releasing the power button while the power supply is in standby mode. Activating PSON# connects the power supply's PSON# input to ground, thereby switching the power supply to full-on condition.

Pin 21 (TFSC) may be not used (n/c).

In 20 PIN ATX <--> DELL 24 PIN+ 16PIN connectors adapter WHITE(-5V) 20 PIN ATX may be left unconnected.
Grey wire that was connected to dell motherboard did his job well, i.e. when it was shorted to the ground PS turned on and stayed on just as it supposed to be.

The following figure shows the P2 (16 pin) DC power connector.

Pin Function Pin Function
1 +3.3 VDC (blue/white) 9 +5 V (red)
2 Common (black) 10 Common (black)
3 +12 V (yellow) 11 N/C
4 N/C 12 N/C
5 N/C 13 N/C
6 N/C 14 +5 V (red)
7 +12 V (yellow) 15 Common (black)
8 Common (black) 16 N/C

Dell Precision 610 (and maybe other Dell workstations of similar age) also uses a very similar 24pin P1 connector, but according to the service manual, pins 17-24 are -5 VDC (white), -5 VDC (white), +5 VDC (red), +5 VDC (red), +5 VDC (red), TFSC (brown), +3.3 VDC (blue/white) and common (black) respectively, instead of N/C, +5 VDC (red), +5 VDC (red), +5 VDC (red), TFSC (brown), +5 VDC (red) and +3.3 VDC (blue/white)?

Compatible PSU are NPS-330CB B, NPS-330CB E, PS-5251-1D

16 pin Dell dimension PSU connector connector layout
16 pin Dell dimension PSU connector connector
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Источник(и) этой и дополнительной информации: support.dell.com
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