[GreenKeys] Fwd: Teletype M33 progress

[teletypeparts at comcast.net]

----- Forwarded Message -----

From: "teletypeparts" <teletypeparts at comcast.net> 
To: "Douglas Jones" <douglas-w-jones at uiowa.edu> 
Sent: Tuesday, September 13, 2016 4:28:07 PM 
Subject: Re: [GreenKeys] Teletype M33 progress 

Doug, 

Actually, the tape punch is just a slave to the printer except it will punch the 8th bit as received. You still need to get an external input to be sure. 

You cant clean the area I am referring to with Q tips. Its a very narrow gap between armature and coil gap. Perhaps you could clean it with piece of paper tape with solvent on it. Thats how I clean the TR pulse contacts in the distributor area. The ones with Caution Hi Voltage plastic insulator over them. 

I will attach pics of the two parts, solenoid and armature and one of approximately the way they are installed except the gap is not as wide. 

Hope this helps. 

Wayne 

----- Forwarded Message -----

From: "Douglas W Jones" <douglas-w-jones at uiowa.edu> 
To: "teletypeparts" <teletypeparts at comcast.net> 
Sent: Tuesday, September 13, 2016 2:55:15 PM 
Subject: Re: [GreenKeys] Teletype M33 progress 

On Sep 13, 2016, at 1:30 PM, teletypeparts at comcast.net wrote: 

> Its possible that the armature is sticking to the coil or solenoid due to some gummy oil residue. I think I have a pic of the area. I do. I have labeled it for you. 

I took a photo that's very similar, and then used it as an illustration on the Wikipedia page for clutch: 
-- https://commons.wikimedia.org/wiki/File:TTY-ASR-33-Clutch.jpg 

I don't think anything there is sticky, but I can go at it with Q-tips and alcohol just in case. 

> There are two springs behind the selector clutch stop and latch levers. Make sure neither are broken. The are right under the fuse holder. 

I've removed and reinstalled both. 

> Wait, first see if it prints correctly from a computer. If it does, the trouble is in the KBD, AB or TR. If it doesnt print correctly from the computer then the problem is definitely in the printer. 

I can use the paper-tape punch to tell me what the binary data is on the code bars. That's an easy way to distinguish between rangefinder problems and print mechanism problems. 
Doug Jones 
jones at cs.uiowa.edu 



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