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Re: TDS460A Will not turn on?


 

I¡¯m kind of surprised they handed out ¡°seconds¡± to JA folks. In ¡®79 I was a JA advisor at Opto div, at that time if JA needed it JA got it. We did an electronics project and our division PCB designer laid it out, the manufacturing div made the PCB and our div controller certified the books, HP really went all out for JA.

At the time I was there were several amazing things I found, the 7 segment displays for Cadillac were color/intensity matched an order of magnitude better than the eye could resolve. We started building transistors for one of the instrument divisions because our Fab Dept had better quality control.

This is why I never understood the problem, the Opto-couplers worked fine they just seemed to break more often additionally the push to use in-house parts that were waaay cheaper than brand ¡°X¡± was high.



Regards,

Stephen Hanselman
Datagate Systems, LLC
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On Aug 20, 2019, at 02:16, Dave Seiter <d.seiter@...> wrote:

In the late 70's I was in a Junior Achievement program sponsored by a couple of guys from HP optical (Page Mill); they took us on tours, told us lots of stories (some rather racy), and gave some of us who were interested lots of "samples" that were mostly seconds (wrong tints, poorly filled molds, loose specs, etc) from single LEDs to laser modules, but never any optocouplers. When I asked for some, I was eventually given "real" samples because the "failure rate was so low". At least on the types I was interested in.
-Dave
On Monday, August 19, 2019, 02:33:24 PM PDT, Chuck Harris <cfharris@...> wrote:

Steve,

As a life long EE, I would not have put up with that for
a minute. Either the circuit would get redesigned, or the
vendor of defective parts get banned.

But, I have always been a bit of a hard-ass about stuff like
that.

-Chuck Harris

Stephen Hanselman wrote:
Chuck,

He would change them 3 or 4 at a time. Now we see two or three over 5 or 6 units. The 6130C uses 22 (or so) and the OEM HP ones were unstable. HP got better, but at the time (1979) they broke at the drop of a hat.

Other folks, Monsanto, LiteOn, etc, all seemed more stable and reliable.

steve




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