Which power suply output opens/closes the DVD drive door?
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From: John Doe on 16 Feb 2010 19:27 Anybody know which power suply output powers the DVD drive door? I recently tried increasing the CPU multiplier on my main system and the system died. First, I suspected the BIOS was flashed wrong... But, prior to this problem, the DVD drive door was not properly closing, it had to be push started. Put that DVD drive in my backup PC and it works fine, so the main system PS is also suspect. Thanks.
From: Paul on 16 Feb 2010 20:49 John Doe wrote: > Anybody know which power suply output powers the DVD drive door? > > I recently tried increasing the CPU multiplier on my main system > and the system died. First, I suspected the BIOS was flashed > wrong... But, prior to this problem, the DVD drive door was not > properly closing, it had to be push started. Put that DVD drive in > my backup PC and it works fine, so the main system PS is also > suspect. > > Thanks. The DVD would be on "12V1", with the hard drives. 12V1 is also the yellow wire(s) on the main ATX power supply connector. 12V1 runs the system fans. If the system fans "wander", when they're supposed to be constant speed (like one of your case fans), that is a warning sign the 12V rail isn't stable. The processor ATX12V is "12V2". Both 12V1 and 12V2 rails may be traceable to the same common power source, and each leg may have its own current limiter circuit. You would think the spindle motor of the DVD, would be more sensitive to voltage, than the motor that closes or opens the drawer. The drawer on the DVD, probably senses motor current, to detect an obstruction. So anything that causes the drawer motor to draw too much current, could stop it from moving. Also, hard drives are rather sensitive to voltage, and cannot take too much drop on their rails, without going through a spin down/spin up cycle. A multimeter will tell you whether the supply is within +/-5% or not. Paul
From: John Doe on 16 Feb 2010 21:21
Paul <nospam(a)needed.com> wrote: > You would think the spindle motor of the DVD, would be more > sensitive to voltage, than the motor that closes or opens the > drawer. I would guess that door motor requires a surge of power, but that is just a guess. > The drawer on the DVD, probably senses motor current, to detect > an obstruction. So anything that causes the drawer motor to draw > too much current, could stop it from moving. Like too much current caused by not enough voltage/power. My cordless rotary tool sometimes stops when the battery is low, maybe because more current is required when voltage is less, activating the current limiter curcuit. Thanks in part to your advice, Paul, I am going to try hooking up the old 350 watt supply to my (stripped down) newer system. If it works, that will prove (or highly suggest) the need for a new PS. If the old supply blows up, I will try USENET from my iPhone... |