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40 pin IDC male connector layout
40 pin IDC male connector
Similar to Dell Dimension 3100 (no Mic) and 5150 (USB skts are counted from the left)

 

Pin
Number
Pin
Name
Description
1   Headphones   Left
2   Headphones   GND
3   Headphones   Right
4   ?   
5   Mic in   Left
6   ?   
7   Mic in   Right
8   Mic   GND
9   ?   
10   ?   
11   ?   
12   Ground   GND
13   ?   
14   ?   
15   Diag LED 3  
16   ?   
17   Hard Drive LED   -ve
18   Diag LED 2   
19   ?   
20   Pwr LED Green   -ve (note 1)
21   (missing)   'Key'
22   Pwr LED Oragge   -ve (note1)
23   PWR ON   switch to Gnd
24   LAN LED   +ve
25   ?   
26   LAN LED   Gnd
27   PWR ON   Gnd
28   GND   
29   GND   
30   GND   
31   GND   
32   ?   
33   USB #1p4 +5v (note 2)
34   USB #1p3, Data   
35   USB #1p2, Data   
36   Gnd   
37   USB #2p3, Data   
38   USB #2p2, Data   
39   USB #2p4  +5v (note 2)
40   ?   

Note 1. The power LED is a 'bi-colour' type'. The voltage on the control pair is reversed to switch from one colour to the other (so +5v  / 0v is Orange,  0v / +5v is Green

Note 2. The USB 5v fuses are on the motheboard (replacing the front panel board won't fix a blown fuse)

According to 2 reports in our database (2 positive and 0 negative) the Dell OptiPlex 745 & Dimension C521 I/O Panel Assembly pin-out pinout should be correct.

Is this pinout
Dell OptiPlex 745 & Dimension C521 I/O Panel Assembly pin-out visual pinout:click to enlarge
Source(s) of this and additional information: http://www.sevenforums.com/hardware-devices/63920-dell-dimension-c521-front-panel.html
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