Unless it has been modified by a previous owner, an ASR reperf’s selector magnet is not connected to the switch or anywhere else within the ASR. The magnet is wired to a completely separate connector on the reperf and then run to whatever external circuit is desired. 

The only electrical thing on the perf or reperf that is connected inside the ASR is the power backspace solenoid if that option is present. And that damn thing is hardwired!

Of course, having said all this, someone can now point me to the BSP that shows I am utterly wrong. 

Cheers
Nick

On Sun, Feb 27, 2022 at 11:36 PM John, W9DDD <w9ddd@tapr.org> wrote:

It seems to me that there must be some electrical component to this.  Not necessarily the current problem, which I tend to believe is related to blocking bail, but the problem where the reperf is being driven by both the selector magnet and the code bar extensions.   It would seem to me that there should be a circuit to blind (mark hold) the selector magnet when the K/KT/T switch is in the position to engage the code bar extension with the punch slide latches.   Having a perforator instead of a reperforator I haven't explored that aspect.

---
----
The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
On 2/27/2022 5:33 PM, Nick England wrote:
The keyboard transmitter contacts are controlled by the keyboard code bars. Those contacts provide the serial electrical connection between keyboard and printer. There is no mechanical connection for transferring characters from keyboard to printer. 

The keyboard code bars are extended to the left to mechanically transfer characters from keyboard to perf/reperf. The code bar extensions (“basket”) are probably where your problem lies. It may be just a matter of aligning the perf/reperf punch slide latches to line up with the keyboard code bar extensions. 

The perf/reperf actually cycles faster than the printer so that in T mode you can type/perf faster than the printer’s 60wpm. In K and KT mode the keyboard runs at the same speed as the printer. 

N.B. A perf has no electrical connection. A reperf has a selector magnet input. Lots of 28ASRs have a perf only, so the cam disengages the perf/reperf. 

Here’s the dope-
Cheers
Nick

On Sun, Feb 27, 2022 at 5:59 PM W2HX <w2hx@w2hx.com> wrote:
>Most likely the transfer bars from the keyboard to the perf ...  best to get the adjustment manual and run thru them before anything else.

Question. Are these the same transfer bars used to actuate the printer? The printer works fine from the keyboard. So could the problem be how the reperf is bolted down to the plate, maybe it was bolted down slightly off kilter? Could it be that simple? Again, I'm hoping that because when I type and the printer prints the character perfectly from the keyboard, maybe the keyboard transfer bars are aligned ok?

> Usually there is a cover over the punch block which guides the confetti into a chute going to a chad box, which gets emptied by you when it gets full.
Anyone have some pictures of this? I don't see much room in the cabinet for a chad box, but maybe I'm not looking at the right area?

> finding the sticky transfer bars is probably the first thing you ought to do ... then you will have a working punch, and if you decide to swap for another reperf the keyboard bars will already be set up.
Ok, so this makes me think you are saying the problem may be with just the keyboard transfer bars and not the interface of those bars to the reperf? You seem to indicate that putting in another reperf would likely have the same problem.

Thanks for all the comments!

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

-----Original Message-----
From: Jim Cooper <jim.w2jc@gmail.com>
Sent: Sunday, February 27, 2022 5:24 PM
To: W2HX <w2hx@w2hx.com>; GreenKeys@mailman.qth.net
Subject: Re: [GreenKeys] M28ASR perf question

On 27 Feb 2022 at 21:34, W2HX wrote:

>   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

Most likely the transfer bars from the keyboard to the perf ...  best to get the adjustment manual and run thru them before anything else.

>   2.  What is involved in swapping a perforator? Hard? Easy?

relatively easy.  Though with the KT bars from the keyboard, you will have the same problem with getting them aligned and non-binding.

>   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?

Usually there is a cover over the punch block which guides the confetti into a chute going to a chad box, which gets emptied by you when it gets full.

> 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.

finding the sticky transfer bars is probably the first thing you ought to do ... then you will have a working punch, and if you decide to swap for another reperf the keyboard bars will already be set up.

w2jc


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>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/

>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html

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