. Unlike many proprietary Dell boards, this model uses a relatively standard . Front Panel Pinout Diagram
| Role | Color of Dell Wire | Location in Connector | | :--- | :--- | :--- | | | Black & Yellow | Top-left & Top-right pins | | Power LED (Bi-Color) | White & Orange | Bottom-left & Center-bottom pin | | Diagnostic Sense Pin | Red | Bottom-right pin | dell mih61r mb front panel pinout
| Signal | Description | |-----------------|--------------------------------------------------| | AUD_MIC_IN | Microphone input (mono) | | AUD_MIC_BIAS | 3.3V bias for electret mic | | AUD_FPOUT_L | Left channel audio output to front panel | | AUD_FPOUT_R | Right channel audio output to front panel | | AUD_RET_L | Return from front panel jack (for sensing) | | AUD_RET_R | Return from front panel jack (for sensing) | | AUD_GND | Analog ground (pins 14 & 20) | Consequently, pins 7 and 9 (Reset SW) are
Many OptiPlex systems that use the MIH61R motherboard (like the 390 DT/MT) do not have a physical reset button on the original Dell chassis. Consequently, pins 7 and 9 (Reset SW) are often or grounded internally. Connect the plug across Pin 6 and Pin 8
The power switch turns the computer on and off. It does not have polarity, meaning it does not matter which way you orient the connector. Connect the plug across Pin 6 and Pin 8 . 2. Connecting the Power LED (PLED)