Re: Slab won't power on?

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The slabs I have are in storage, so I can't really test things out. (That
said, I've never actually powered these on, they were part of a batch that
was saved when someone moved.)

Does it work with a head?


On Sat, Dec 28, 2013 at 8:42 PM, Mouse <[email protected]> wrote:

> I'm trying to fire up one of my Slabs (mostly to drive a NeXTPrinter).
> But I can't get the silly thing to power on.  I'm trying to run it
> headless; I've tried two different slabs and neither seems to be
> willing to power on with the 450-ohm pin-6-to-GND signal.  (As a proxy
> for "power is on", I have both the fan spinning (I'm trying this with
> the cover off) and the terminator power light on a terminator I have
> plugged into the SCSI port.  On one of them, I've also tried a
> voltmeter on one of the power pins on the internal SCSI disk's power
> connector.
>
> I note the machine is driving about 1.8V on pin 6 of the monitor
> connector (the one that gets the 450 ohm resistor to ground), but, if I
> unplug the power connector from the motherboard, the power supply
> drives nothing like that on any of its pins.  Nor does 450 ohms to
> ground on any of the power supply's pins cause it to power up.  This
> leads me to suspect that that voltage is coming from the onboard
> battery - would a dead battery lead to this symptom?  Is 1.8V the
> normal voltage to find on pin 6?
>
> /~\ The ASCII                             Mouse
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> / \ Email!           7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B
>

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<div dir=3D"ltr"><div>The slabs I have are in storage, so I can&#39;t reall=
y test things out. (That said, I&#39;ve never actually powered these on, th=
ey were part of a batch that was saved when someone moved.)<br><br></div>Do=
es it work with a head?<br>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Sat,=
 Dec 28, 2013 at 8:42 PM, Mouse <span dir=3D"ltr">&lt;<a href=3D"mailto:mou=
[email protected]" target=3D"_blank">[email protected]</a>&g=
t;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">I&#39;m trying to fire up one of my Slabs (m=
ostly to drive a NeXTPrinter).<br>
But I can&#39;t get the silly thing to power on. =A0I&#39;m trying to run i=
t<br>
headless; I&#39;ve tried two different slabs and neither seems to be<br>
willing to power on with the 450-ohm pin-6-to-GND signal. =A0(As a proxy<br=
>
for &quot;power is on&quot;, I have both the fan spinning (I&#39;m trying t=
his with<br>
the cover off) and the terminator power light on a terminator I have<br>
plugged into the SCSI port. =A0On one of them, I&#39;ve also tried a<br>
voltmeter on one of the power pins on the internal SCSI disk&#39;s power<br=
>
connector.<br>
<br>
I note the machine is driving about 1.8V on pin 6 of the monitor<br>
connector (the one that gets the 450 ohm resistor to ground), but, if I<br>
unplug the power connector from the motherboard, the power supply<br>
drives nothing like that on any of its pins. =A0Nor does 450 ohms to<br>
ground on any of the power supply&#39;s pins cause it to power up. =A0This<=
br>
leads me to suspect that that voltage is coming from the onboard<br>
battery - would a dead battery lead to this symptom? =A0Is 1.8V the<br>
normal voltage to find on pin 6?<br>
<br>
/~\ The ASCII =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Mouse=
<br>
\ / Ribbon Campaign<br>
=A0X =A0Against HTML =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0<a href=3D"mailto:mouse=
@rodents-montreal.org">[email protected]</a><br>
/ \ Email! =A0 =A0 =A0 =A0 =A0 7D C8 61 52 5D E7 2D 39 =A04E F1 31 3E E8 B3=
 27 4B<br>
</blockquote></div><br></div>

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