Greetings gentlemen !
I would like to introduce you this Hewlett Packard 54502A digitizing oscilloscope in this short teardown.
I bought it for very reasonable price, because seller told me that it show some errors and I hoped it can be repaired.
So let's have a look.
Device after turning on and ran self test:
My friend told me this is very bad. I agree with him
This machine was a virgin
because of his sticker "warranty void if removed", so I was likely the first one who opened it after it's last calibration in January 1998 (cal sticker with date).
Dirty and nasty, the same smell when you open an old TV, black dust on HV accessories.
Lot of dust:
Power supply. This looks primitive for me compared to evilness of the mainboard.
I cleaned HV supplies:
Everything clean now. Very easy assembling and dissasembling. However I recommend to seal all screws and write on it where they belong to
These orange Nippons are perfect, they always hold their capacity, ESR and tgD even in rough conditions.
I noticed that Packards alway use golden plating on their keyboard accessories
Computer. M68000. Where can I get this in gold ceramic ?
Should I replace this Dallas IC ?
Preamps and attenuators
More hybrids and ... mmm, thermal oscillator
I was talking about evilness of the mainboard. Do you agree with me ? I can count 8 layers in close up of the laminate.
Anyway, it is beautiful, I like these clear laminate that I can read traces in inner layers
I didn't take a photo, but this was very dirty, balls of dust:
I hope you like it, feel free to ask and require more photos.
Now I am going to check power supplies and find out what's wrong with this machine.
Do you have any experience with this HP digiscopes series ?
All of photos here:https://picasaweb.google.com/100683312221737332313/HP54502A