OPUS PSU Problem

**WhateverJames** · 11-23-2003, 07:13 PM

I wasn't able to get the PSU to turn the computer on when turning the ignition on. I checked the polarity of the green and white wires and they're fine and I reversed the polarity to make sure.

I just used my computer's original power switch to turn the computer on and I gave it a test drive. I thought I'd just put the switch up front and turn the computer on and off when I want. But, after about a half hour of driving, the computer always shuts off and the PSU gives me 4 flashes from the green light.

One of the problems the manual lists is the polarity of the wires that go to the mother board. I don't have those wires hooked up to the mother board, otherwise the computer would never come on because the PSU doesn't respond to the ignition being switched on. Would not having the green and white wires connected to the mother board cause the computer to shut down after a half hour?

**Alric** · 01-15-2004, 08:45 AM

James: Did you ever get an answer for this? My feeling is that the Opus doesn't like having the switched power lead disconnected.

Thanks,

Alric

**gmoore** · 01-15-2004, 10:59 AM

Just went through this with my own install - Opus and Shuttle on a boat. Reboot for me ocurred after 25 minutes. I then connected the switched power wire and the green and white wires to the motherboard per the instructions. No more issues. The PS works a treat. Excellent piece of kit IMHO. I'm powering a dvd player and several usb devices with the Opus and, since correcting the wiring, it hasn't skipped a beat. If you really want the switch on the case I see no reason the switched power wire couldn't be led back up to the front panel and the switch placed in the original location.

Cheers, Greg

**shchua** · 01-15-2004, 09:07 PM

I second that - the white/green wires MUST be connected to the motherboard's Power On connector in order for my Opus 150 to turn on (as I discovered the hard way myself). This is stated clearly in page 5 of the manual . You have to wait something like 5 seconds after applying +12V to the Yellow (Ignition) wire before it does this though.

If I disconnect the white/green wires from the Opus, all I get is 2 blinks on the green LED in the Opus. According to the manual, this means that the "power up sequence failed" and it asks you to check that the 2 pin power switch (white/green) cable is connected properly.

Once you install the Opus, there shouldn't really be a need to have a manual on/off switch connected to the motherboard. Just control the power to the PC using the yellow Ignition wire and the Opus does the rest. However, there are the rare occasions when the Opus is not able to shutdown the PC, eg when a rogue application prevents Windows from shutting down. In this case, my shutdown controller cuts off power to the Opus after 2 minutes to avoid draining the battery.