Did a quick look inside the HP 5006A signature analyzer. Not really a teardown but anyway...
According to the time codes, this HP 5006A seems to be made in the mid-80s or later.
Nothing fancy, mostly standard ICs. Like any HP gear it's well designed and nicely built:
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=387330;image)
The front panel is made of steel -it's ferromagnetic.
![Shocked :o](https://www.eevblog.com/forum/Smileys/default/shocked.gif)
Accidentially a magnet stuck to it that I had laying around.
I would have expected it to be made of aluminium.
Even though this is only a special helping device for checking HP test gear there are some unobtanium ICs in there.
I have to correct myself. Just a quick look into the operation manual shows that the 5006A signature analyzer was a general tool for troubleshooting "complex electronic logic circuits to the component level." Also Tek had one in their portfolio.
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=387332;image)
Haven't been able to
google find out what that 1820-1052 is and what it does.
(Have to check the service manual..)
I like that Mikrocontroller with that piggibacked EPROM (haven't seen something like that before).
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
The Mostek MK38P70 is a version of the MK3870 in a P-Prom-package where "P" stands for piggiback.
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
It's running at incredible 4MHz. Seems ridiculous today but was a standard speed at the time this device was designed.
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=387334;image)
Nothing fancy on the underside. I like that marking of all parts and their outlines. That makes such a difference when you have to debug. Nice.
![Smiley :)](https://www.eevblog.com/forum/Smileys/default/smiley.gif)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=387336;image)