I recently got a 4501 as part of a bunch of stuff a friend-of-a-friend
was giving away rather than moving.  Today I tried to fire it up.

Its console is a DE9, and, basd on what I've been able to find, it's
supposed to use the same pinout as peecee DE9 serial ports.  But it
doesn't seem to; when I use a voltmeter (a fairly high-impedance one -
a Fluke 87) to measure the voltage on pin 3 relative to pin 5, I get a
voltage in the low tens of millivolts.  It's not just dead power; when
I plug power in, the "Power" and "Error" lights light, with the "Error"
light going out after about seven seconds, and I plugged one of the
Ethernets into a switch and got link.  It's also not just a dead
voltmeter; the same voltmeter, making the same measurement on a serial
port on another machine, works fine, showing between 8 and 9 volts.  I
tried other pins and wasn't able to find any pair of pins showing more
than .03V or so.

I opened the case, in case it was a disconnected cable or some such,
but the console port connector is soldered directly onto the board.  I
don't see any obvious damage, but I don't really know the 4501.

Does this mean I've just got a fried unit?  Or is there something else
that could be wrong here?

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