So i got the new ROM chip. Hauled the heavy botacnhor out again, taken it apart and stuck it in...and... Winner winner chicken diner! It works perfectly and passes self tests!
![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif)
The front panel cleaned up very nicely with some PCB cleaner (IPA+Ethanol) and just look at how nice it looks now. There are still some scuff marks around the front frame but that would need to be touched up with paint.
Thanks for the help guys!
![](https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/?action=dlattach;attach=497174;image)
Because the system disk floppy is very important (Contains the firmware that gets loaded in on boot) i made a copy of the original one and stuck it inside the unit for safe keeping, the space at the top of the CRT module is perfectly sized to hold two floppies. Unforcenetly i could not figure out how to read these floppies in a PC because they use a weird format. The way i got these copies is that the HP4145B has a option in the menu that lets you duplicate the system disk by inserting a blank disk.
![](https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/?action=dlattach;attach=497180;image)
Now that it works its time to try it out. Luckily i have my triax cable set that was made DIY for a HP 4141B.
![](https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/?action=dlattach;attach=497186;image)
Here it is all plugged in. Look at all that triax goodness. One triax is left unconnected because this unit does not have a actively driven ground output.
![](https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/?action=dlattach;attach=497192;image)
And here is the money shot. Set it up on the bipolar transistor preset, hooked it up to the first 3 SMU channels and it spits this out at the push of a button.
Mmmm... graphs. Also notice how the display gets brighter close to the graph zero point, the lines are individually vector drawn so the overlapping lines add up and become birther. Those vector fonts also look so lovely clean.
![](https://www.eevblog.com/forum/testgear/hp-4145b-semiconductor-analyzer-repair-with-photos-(display-garbage-dead-rom)/?action=dlattach;attach=497198;image)