18 Mar
2005
18 Mar
'05
3:53 p.m.
Hello,
I have two RK05J drives, both exhibiting the same problem.
They are *not* currently connected to a system. I have them on the bench
cleaning them up and getting them ready to connect to a PDP 8/e system after
a long period of storage.
There is the I/O terminator card installed in the proper slot in the drive
electronics backplane.
When the drives are powered up, the "power" and "load" lights are on,
and
the door release is activated so that the door can be opened and a disk pack
inserted. However, the blower motor that provides the air circulation for
the drive never starts up. I've checked both blower motors to assure that
they are not seized, and the both spin very freely. I traced the power
wires from the blower motor to a barrier strip, where I checked for
110V AC power, and there's nothing there. So, somewhere in the
circuitry, something isn't right. Any ideas?
IIRC one of the 2 relays on top of the PSU chassis (rear left) controls
the blower, the other one controls the spindle. And the blower relay is
controled by one of the pwoer fail signals.
You'll need the prints, of course, but that might give you a place to
start looking.
-tony