The xw9400 front panel connector J34 (there is no J24) pinout, looking at the motherboard, is:
There are 2 key (missing pin) positions on pins 10 and 15. Use these empty pins to help identify the signals.
The pinout is very similar to other older HP Workstations. Some hints:
- Pins 1 and 3 are for the hard drive activity LED.
- Pins 2 and 4 are for the power LED. HP systems have back-to-back LEDs connected across these pins. A green LED is lit in normal operation and red is lit (and blinks error codes) when there are errors.
- Connecting a momentary switch between pins 5 and 6 will turn the computer on and off.
- Connecting a momemtary switch between pins 7 and 8 will force a system reset.
- Pin 9 is labelled as +5V, but it is fed by a 100 ohm pullup resistor to +5V, so it will not supply a lot of current. FYI.
- SPKR+ and SPKR- are for the internal speaker.
Most of the other xw9400 connectors follow industry standards, i.e., the IDE drive and floppy connectors.
Is there anything else you want to know?