Which power suply output opens/closes the DVD drive door?

  • Thread starter Thread starter John Doe
  • Start date Start date
J

John Doe

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.
 
John said:
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.
Click to expand...

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
 
Paul said:
You would think the spindle motor of the DVD, would be more
sensitive to voltage, than the motor that closes or opens the
drawer.
Click to expand...

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.
Click to expand...

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...
 
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