[GreenKeys] M28ASR perf question

[W2HX]

Hi Bill, no the problem occurs when the switch controlling the loop to the reperf is off. It is definitely a purely mechanical problem.


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos

From: William Wuttke <wcwuttke at gmail.com>
Sent: Sunday, February 27, 2022 5:16 PM
To: W2HX <w2hx at w2hx.com>
Cc: GreenKeys at mailman.qth.net
Subject: Re: [GreenKeys] M28ASR perf question

Eugene,

If you are trying to punch a tape from the keyboard while the reperf is in the loop you will always run into problems. The keyboard punches directly to the punch mechanism through a mechanical linkage. The reperf uses a selector mechanism which operates separately from the keyboard mechanical punch linkage. So if the reperf is in the loop when you are trying to punch a tape from the keyboard, both mechanisms are trying to punch the tape, and confusion results. This gave me fits trying to understand this when I was restoring my M28ASR.

Bill
KE3BK

On Sun, Feb 27, 2022 at 1:40 PM W2HX <w2hx at w2hx.com<mailto:w2hx at w2hx.com>> wrote:
Hi friends,

I have a 28ASR with a chadless perforator/reperf. The way it is set up is when the K/KT/T switch is in “T” mode, it will punch tape from the keyboard. There is also a switch that allows the reperf to punch the tape from the loop. When I punch tape from the loop the perf works great. Always repeatable and correct. However, in KT or T mode, it is not consistent. Almost always there is some stuck bits. Recently it was punching all 5 holes regardless of what I typed. And then again it will work but bit 5 might be stuck on. But it always works great when configured in the loop.

A few years ago I bought a plastic print head from K6YIC for the perf to install it. The procedure looks quite involved. So I got to thinkin’. I’ve always wanted a full chad perforator. Even if I have to deal with the punched chads. I think it demonstrates better and I do enjoy demonstrating for shack visitors.

So I am wondering, maybe now is the time to swap out my perf with a full chad version and also install the new plastic print head at the same time? Can anyone tell me a few things?

  1.  Are the sticking bits most likely an issue with the perf mechanism or the keyboard levers? If it is the keyboard, then a new perforator wouldn’t help fix it
  2.  What is involved in swapping a perforator? Hard? Easy?
  3.  Where do the chads go with a full chad unit? How are the chads emptied? Are there any modifications I would need to my cabinet? Anyone have a video on this?
  4.  Anyone have a spare full-chad perforator for sale?

I guess I could attempt to find the cause of the sticking bits, but if I really want a full chad unit, why not just replace it. Would seem the path of least resistance. But open to ideas.


73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/c/w2hx-channel/videos


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