[GreenKeys] M28ASR Strange Loop issue...found?

[Lawrence Godek]

Deoxit is supposed to affect phenolic material, especially around 
switch's or other locations.  Judicial application of it with maybe a 
toothpick or something similar and let it migrate to other metallic 
areas of interest.  Spraying sensitive material needlessly can cause 
harm to said items.  As i've been told. Having a phenolic or some such 
susceptible material deteriorate and being a hard to find replacement 
could cause headache's of major proportions.   Perhaps Scott could lay 
in some more info as his profession allows.

Larry W0OGH


On 12/11/2022 4:07 PM, John W9DDD wrote:
> For some strange reason I've never heard of DeoxiT.  To my surprise Microcenter shows about 30 products with a DeoxiT search.  I see a mini spray can or a 25ml liquid with needle dispenser that look interesting.  I wonder if the flux they have would be useful for some of the old wires that have gotten some corrosion.
>
> John, W9DDD
>
>
>> On Dec 11, 2022, at 4:24 PM, W2HX <w2hx at w2hx.com> wrote:
>>
>> One bit of good news. Nick and others had suggested that I spray some deoxit into the RJ jack and work it with a plug. I can now report that the RJ jack is now properly "normalling" when the plug is removed! I tried to work it without deoxit and it didn't work. The deoxit was the trick. Thanks Nick et., al. for the suggestion!
>>
>>
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>>
>>
>> -----Original Message-----
>> From: W2HX
>> Sent: Sunday, December 4, 2022 9:35 PM
>> To: Greenkeys <greenkeys at mailman.qth.net>
>> Subject: M28ASR Strange Loop issue...found?
>>
>> Ok everyone. I've got lots of updated information on my issue. To recap, this ASR has been running very well for the last 15 years. Recently the loop-driven LPR (sits on the keyboard contacts) recently stopped working in the way it has for all these years.  I've spent the last week and have poured dozens of hours into understanding how my ASR is set up. It was set up by Jack Hart (sk) who knew what he was doing. Only problem is I didn't know what he was doing hihi.
>>
>> Thanks to Nick, K4NYW who saved some of the materials from Jack, and thanks to me for never deleting emails, I was able to find some original correspondence with Jack dating back to July of 2005 when I first bought the machine from him. I studied the diagram for the WU 9797 LESU ad nauseum and learned a LOT.
>>
>> Here is how my electrical is configured.
>>
>> EXTERNAL LOOP (TRAFFIC) ---> KEYBOARD ---> TD ---> LPR (ON) ---> POLAR RELAY INTERNAL LOOP 1 (KEYED FROM POLAR RELAY) ---> PAGE PRINTER INTERNAL LOOP 2 (NOT KEYED, ALWAYS MARKING) --> LPR (OFF)
>>
>> I have a DPDT switch mounted beneath the ASR that connects the LPR to one of two loops, either the internal loop (LPR OFF) and the external loop (LPR ON). In this way, when I don't want to punch tape from the external line, (OFF) it is connected to the internal loop and keeps the LPR in mark-hold (closed) at all times.
>>
>> The problem (previously described poorly) was that when the LPR was off (mark-holding, LOOP 1) it would run open. I spent days working on figuring this out. I found that when I plugged an ammeter into the RJ (reperf jack) it would close the circuit and work properly! This made no sense because these jacks should be normalling (shorting) when a plug is removed. But in this case, it seems to be open circuit.
>>
>> Ultimately, I must have damaged this jack when I was messing around learning about the electrical configuration which must have caused this problem. I wonder if anyone has any thoughts on this? I could attempt to pull the LESU open it up and repair it. And I probably should but seems like a bigger project than I'd like to take on at this moment. So I might just make a shorting plug to do the business.
>>
>> In case anyone is interested, here is a video I made on the whole set up and you can see the problem firsthand. And you can see how the problem resolves with an ammeter in the RJ jack.
>>
>> https://youtu.be/ULO6B07koDM
>>
>>
>> 73 Eugene W2HX
>> Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx/videos
>>
>>
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