H19 labels question

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Paul Cushing

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Apr 7, 2024, 11:00:04 AMApr 7
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 When I was blowing the dirt/dust out of the H19 that I bought off eBay a couple of months ago, two labels blew out onto the grass.  One has PN 0000411-27795 and the other is 0000680-S27795.  I believe they came off the Terminal Logic Board since the last numbers match as if they are a serial  number. I would like to get hem glued back on if I can find out here they came from.
> Thank You very much in advance
> Paul Cushing

glenn.f...@gmail.com

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Apr 7, 2024, 11:09:58 AMApr 7
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Here’s where one of mine is located (this is an H19A). I only see one.  these labels routinely fall off of most of my old Heath boards. I haven’t tried to re-attach any of them. 

 

Good luck.

 

  • Glenn

 

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Paul Cushing

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Apr 8, 2024, 9:32:02 AMApr 8
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Thank you Glenn.  After reading your post I realized that I had mistyped, mine is an H19A also.
 
Duz your terminal work?  Where is the -5V regulator?
 
Paul Cushing
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Glenn Roberts

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Apr 8, 2024, 11:27:28 AMApr 8
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Yes terminal works great.  Not sure where -5V regulator is. Does yours look different?

Sent from my iPad

On Apr 8, 2024, at 9:32 AM, Paul Cushing <pfcu...@charter.net> wrote:


Thank you Glenn.  After reading your post I realized that I had mistyped, mine is an H19A also.
 
Duz your terminal work?  Where is the -5V regulator?
 
Paul Cushing

Sent: Sunday, April 07, 2024 11:09 AM
Subject: RE: [sebhc] H19 labels question

Here’s where one of mine is located (this is an H19A). I only see one.  these labels routinely fall off of most of my old Heath boards. I haven’t tried to re-attach any of them. 

 

Good luck.

 

  • Glenn

 

<image001.jpg>

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Paul Cushing
Sent: Sunday, April 7, 2024 8:18 AM
To: SEBHC <se...@googlegroups.com>
Subject: [sebhc] H19 labels question

 

 When I was blowing the dirt/dust out of the H19 that I bought off eBay a couple of months ago, two labels blew out onto the grass.  One has PN 0000411-27795 and the other is 0000680-S27795.  I believe they came off the Terminal Logic Board since the last numbers match as if they are a serial  number. I would like to get hem glued back on if I can find out here they came from.
> Thank You very much in advance
> Paul Cushing

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Paul Cushing

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Apr 8, 2024, 10:04:19 PMApr 8
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Glenn, it is U405 in the upper right corner but looking at my schematic I'll be darned if I can find out where that voltage is used.
 
Paul Cushing

glenn.f...@gmail.com

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Apr 8, 2024, 10:11:10 PMApr 8
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Ah yes. Hmm interesting. I’m not the first owner and I didn’t build this (though the terminal boards were pre-assembled, I’m sure.) Perhaps whatever needed -5v on the H19 was eliminated in the H19A but they didn’t update the PCB?   But wait, I guess that regulator *is* installed on your board?  so maybe the previous owner of this terminal removed it?  Dunno.

 

  • Glenn

Paul Cushing

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Apr 9, 2024, 3:32:05 PMApr 9
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Glenn, all good possible suppositions Winking smile emoticon
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norberto.collado koyado.com

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Apr 9, 2024, 11:38:28 PMApr 9
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What is the issue here?
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Paul Cushing <pfcu...@charter.net>
Sent: Tuesday, April 9, 2024 12:31:54 PM
To: se...@googlegroups.com <se...@googlegroups.com>

Glenn Roberts

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Apr 10, 2024, 5:35:40 AMApr 10
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I don’t think there was an issue, he was curious why U405 (apparently a -5V regulator) isn’t installed on my H19 terminal logic board. I have no idea….

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On Apr 9, 2024, at 11:38 PM, norberto.collado koyado.com <norberto...@koyado.com> wrote:


What is the issue here?
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Paul Cushing <pfcu...@charter.net>
Sent: Tuesday, April 9, 2024 12:31:54 PM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: Re: [sebhc] H19 labels question
 
Glenn, all good possible suppositions
<Emoticon3.gif>

norberto.collado koyado.com

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Apr 10, 2024, 3:24:43 PMApr 10
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It is labeled -5.2 volt regulator. If the ROM does not take -5v then you can depop U405. It is a typo on the schematic as it is labeled -5.2v and not -5v.
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Glenn Roberts <glenn.f...@gmail.com>
Sent: Wednesday, April 10, 2024 2:35:26 AM

norberto.collado koyado.com

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Apr 11, 2024, 2:05:28 AMApr 11
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My very old H89 TLB has the regulator. It all depends on the ROM type.

 

 

Paul Cushing

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Apr 11, 2024, 8:39:56 AMApr 11
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Yes, I pretty much figured that out using the schematics.  The -5V goes to the jumper areas next to all the ROMS but then goes nowhere. The regulator is installed, isn’t used, but I am going to leave it there.  It has nothing to do with the TLB issues now that the -12V is fixed.  It was just something that I noticed in the photo Glenn provided in my answer about the labels.

 

Thank you

Paul Cushing

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norberto.collado koyado.com

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Apr 11, 2024, 10:52:30 AMApr 11
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Interesting observation. 👍
From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Paul Cushing <PFCu...@charter.net>
Sent: Thursday, April 11, 2024 5:39:51 AM
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