m4-atx help. Am I missing Wires? - Page 4

Fox_Mulder · 04-24-2008, 09:58 PM

I'm inclined to think it's a logic problem. if only the interface could be updated via usb we wouldn't haveto worry about RMAing these units.

Like I have a problem where when the M4 is in the HARDOFF state it wont send the motherboard pulse when ignition is applied. Details here

hailrazer · 05-08-2008, 12:51 PM

I just got my new M4-ATX power supply from mini-box installed.

And I am happy to say it works perfectly. Goes into hibernate in 5 seconds and the screen turns off

Everyone should try to get one with the new firmware. Mini-box is good to work with once you get them answering emails )

Bugbyte · 05-18-2008, 04:52 PM

Hey folks, I've just gotten one of the new M4-ATX's. After setting it up and putting the dip switches into the P1 configuration, I've bench tested it using a switch to simulate the accessory line.

Turning it on, it worked just fine and the PC booted without issue. Turning it off, however, it simply never turned off. It never signaled the pc to shutdown and never even cut the power off. Just stays on.

Has anyone see this behavior?

Fox_Mulder · 05-19-2008, 02:45 AM

Use a multimeter to check if the off pulse is actually being sent. Have you set the computer to turn off or hibernate when the power button is pressed in the control panel?

You may also need to change a setting that describes the behaviour of the power button in the bios. I had mine set on instant off and changed that to 4 secs then off. This is so when the power off pulse is sent to the motherboard the computer does not do a hard shutdown, rather windows can hibernate or shutdown gracefully - or I can manually bridge the power button connectors for 4 secs and have it do a hard shutdown.

Bugbyte · 05-19-2008, 07:41 AM

Interestingly, I've never been able to detect the pulse on the ACPI line using my multimeter. But I know it gets sent because the computer starts. I've got the meter set to 12v and am looking for a quick spike by measuring the voltage across pins 7 and 6 on J8, correct?

The power settings are set properly in the control panel (hibernate when power button is pressed) and this system was working fine with a Carnetix regulator just before putting the M4 on it.

Fox_Mulder · 05-19-2008, 07:58 AM

Don't measure voltage, measure resistance. It should be infinite and then drop down to 0 and then go back up to infinity.

edit: If our multimeter is not fast enough (it is a 500ms pulse) the pulse may nto be recognised by your multimeter (unlikely) or the resistance value reported wont go all the way to 0 before going back up to infinity. As long as the resistance value lowers you can be sure the pulse is being sent.

Enforcer · 05-19-2008, 08:13 AM

An old analogue multimeter with a needle might be better to use than a DVM in this case.

Bugbyte · 05-20-2008, 05:43 PM

Okay, measuring continuity (doh!) I don't see any pulse at all, but when I touch the DMM leads very quickly I get a jump in the reading.

Also, if I short the jumper it starts up and shuts down properly and immediately.

I guess I don't understand how it could start but not stop?! I think I need to try out some of the other modes to see if the board is working properly.

Fox_Mulder · 05-21-2008, 04:31 AM

lol You seem to have the very opposite problem I have, mine wont send the startup pulse but sends the shutdown pulse fine. I have set my motherboard to power on after power fail to overcome this. You could always rig a circuit up to have the igniton line conected to say your serial port and when the line goes low initiate the shutdown/hibernation sequence, but you shouldn't have to do that if your m4 was working correctly.

n8r4e3 · 05-29-2008, 11:11 PM

So i think im having a similar issue as well,
When M4-ATX is in p1 mode, it sends the startup pulse after 5 seconds, (light flashes quickly, then starts up) But my volt meter tells me it doesnt cut the voltage to the on/off switch after its fired up like it should.
After its turned itself off, it waits 60 seconds, and tries to start itself back up, and so continues the cycle. Any thoughts on this guys?

Ive got the POS+ line connected to the IGN for simulation.

n8r4e3 · 05-29-2008, 11:13 PM

If i pull the power on/off from the PSU after its tripped the on/off, it boots just fine. As soon as i plug it back into the PSU, its like im holding the power button for 5 seconds.

Bugbyte · 05-30-2008, 03:29 PM

Yep, same problem. See my response in your other thread about turn-on difficulty with M4.

n8r4e3 · 05-30-2008, 06:04 PM

Awesome! for those who want to follow along,
http://www.mp3car.com/vbulletin/powe...problem-2.html