Need ASR-32/33 in Brooklyn, NY area ASAP

Tony Duell ard at p850ug1.demon.co.uk
Thu Oct 6 16:10:11 CDT 2005


> 
> On Thu, 6 Oct 2005, Tony Duell wrote:
> 
> > There's a cable harness that attached to the reader. It splits into 3
> > sections. One goes down to the stand and plugs into that module you've
> > found. This is the power supply for the solenoid in the reader itself.
> > One little branch connects to the leaf contact switch on top of the
> > transmiter shafter in the typing unit. And the 3rd branch plugs into the
> > back of the call control unit. It's that last one I want you to unplug.
> 
> Right, this is what I eventually figured out.  I didn't realize the reader
> cables banched off to different points.  Once I found that and unplugged

Yes... The reader contacts (those operated by what Creed would have 
called the 'peckers' :-)) are effectively in parallel with the keyboard 
contacts. Both devices give a parallel output, of course. They then link, 
via wires in the call control unit, to the distributor disk, which 
serialises the data.

The reader has a big solenoid at the bottom that lifts the peckers to 
read the tape and then, when it gets de-energised, operates a ratchet to 
advance the tape. This is poweed by the PSU in the stand (warning : this 
is not isolated from the mains supply!), and is controled by the leaf 
contact on top of the transmit shaft. To operate the reader, a little 
solenoid there is energised. This releases the clutch lever, causing the 
transmit shaft to rotate and turn the distributor bush. That lever also 
closes the leaf contact, energising the reader soelnoid. After each 
character (rotation of the transmit shaft), the lever is forced forwards 
again, and will latch there if the trip solenoid is de-energised (the 
reader is turned off). Of coruse as it comes forwared, it opens the leaf 
contact, de-energising the reader solenoid and advancing the tape.

> the cable to the call control unit the problem went away, isolating the
> problem to the reader.  I then removed the reader and examined it more
> closely and saw the tine out of place.  How it got that way is beyond me.

That was going to be my guess, actually, but I never post guesses without 
some evidence (that is, getting you to do some tests first. 

-tony


More information about the cctalk mailing list