Electronics > Repair
HP 54810A
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GGMM:
You are right

Yeah, but it’s for 500MHZ.
Actually I’m an electronics Mike if you watch the Whellers dealers series.
I start with a small scope, I resell, etc.
So I went from 20Mhz, 60, 100, 200 and now 500.
It passes time and it doesn’t cost me much
Lol

cdt
Wallace Gasiewicz:
Runco:
I am retired and I am just a hobbyist, not an engineer, and do a lot of repair since there are few repair guys around. I actually make enough to support my hobby>
I have had many CRT scopes including the HP 1980 which was supposed to be the first "digital scope". I have repaired lots of them. Tepaired lots of HP stuff that I use. Including stuff like the 3456 and the @#$%^ HP 4332A.
A few yrs ago I bought a HP 58415 and am using it daily. I am gradually trying to get into the 21st century. I think it is OK but not wonderful.
Could you give me some examples why the newer scopes are better? Always looking for a new something and would like some input.Some advice for an old fart.
Wally
GGMM:
hello,

I just spent over 6 hours controlling the NX3000-6003 power supply.
Everything seems normal, and I tested with the multimeter practically all the components except the daughter card.
At one point, I thought, NO it’s not possible that it’s that!
I tested the front power button on the J9 pins 3 and 11 connector that comes from the front panel. Nothing, it’s infinite even by pressing it.
I take advantage of your knowledge to validate.
Dirty button, HS cable, crossover connector.
Confirm yourself before I show the front face
thanks
GGMM:
Hello,

This is the diagram of the  technical manual for the power ON button.
I completely dismantled the front panel.
But I’m puzzled by the pattern.
Yes the switch arrives on the A7 front panel Keyboard, but then we leave with a 10-pin connector for all front controls (buttons, rotary encoders, etc.)
So all the controls are multiplexed.
Good without scheme difficult to say that 2 out of 10 wires would be dedicated to the power button.
Is there un enginner of HP here??
If someone has the diagram of 54810-66504 may you put it
One thing is for sure the key contacts are OK (not dirty at all)
cdt
GGMM:
Hello,

This morning I repeated tests and completely abandoned the theory of the power button. (What an idea Lol)
It’s actually simple, all connectors disconnected from main  acquisition board (54810-66506), I have a net short circuit on the -12V.  (0 OHM)
Surely a capacitor (?)

At this time, I do not know if this -12V power supply supplies many components (I think less than +12V), if it is used for hybrids, attenuators, etc.
I’ll take it apart for inspection.
Once the board is disassembled, I could dig a little deeper, because I could demonstrate the attenuators and the external sync box. at worst hybrids (I cross my fingers that not)

Any information about similar case is welcome and if anyone has the scheme.
Thank you for sharing your experience on this case.

cdt
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