RK05 Help

[Tony Duell]

> 
> 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