[GreenKeys] Model 33 print issues

[Jones, Douglas W]

From: Wayne Durkee [teletypeparts at comcast.net] Tuesday, March 7, 2017 5:49 PM

> Does the 33 ever make the #4 bit error in Local?

Yes, but only when holding down the repeat key or duplicating tape -- both are full-speed operations.

> Is the computer sending 1 or 2 stop bits?

2 -- due to the distributor faceplate.

If you have an adjustment manual check the codebar reset procedure.  You can see the reset by observing the extensions that go to the tape punch.  When you type a character watch and see the slight movement of the codebars that werent marking.  They should move a few thousands to the right on reset.  Of course all the codebars move but the space codebars is where you can see the amount of reset.

> I have a 33 on the bench right now and it had a problem with one of the blocking levers sticking.  I removed the safety stop that keeps the blocking levers from moving too far up (one screw and it slides out).

I did that, and bang, the carriage spring yanked its pulley out, and stretched the CR latch reset spring so I had to replace that.  First spring I've had to replace.

> There is neoprene on the bottom of the metal bar.  The blocking lever was bent badly.  I dont see how this could happen unless someone was messing around with the blocking levers.  I bent it straight and it worked perfectly.  This blocking lever was not intermittent but failed all the time.  You might check your #4 blocking lever to see if it is slightly bent or if the guide it sits in has been pinched a little bit squeezing it.

As I said, I checked the guide comb, making sure all the spaces were wide enough that the blocking levers fall back freely, and burnishing the gaps with a steel shim in the process.  No blocking levers are bent.

> Another codebar area to check is the guide comb.  the second pic shows the guide comb and the one screw to loosen to adjust the guide.  The codebars should be in the guide with some play right and left, not biased either way.

I've already gone over this.  Indeed, the comb was bouncing free, the screw was missing, and I had fun getting it back in place and centered.  That's all taken care of.

              Doug Jones
              jones at cs.uiowa.edu