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New member (with a dso-x 3012a not booting)

 

Greetings from Sweden, Scandinavia!
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I'm Tommy, a new member here on groups.io although in the distant past a member at Yahoo.
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On my bench I have several "HPAK" instruments, mostly HP brand, aged for 25+ years...
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Yesterday I needed a scope and powered up the Agilent DSO-X 3012A, fan starts, Run/Stop blinks twice, entry knob symbol and intensity key blinks, channel 2 button lights up and the ref/math/digital/serial buttons come on, then nothing else.
No display and no reaction to button presses.
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Afer power off and on, It Works!
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Self tests and keyboard tests runs successfully and I take some measurements as well, no troubles at all.
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I get on with measurements for an hour or more, works great!
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On a whim I restart the scope - same problem again!
This time I have to power cycle several times to bring it up. Same story, everything seemingly works as it should, self tests et.c.
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Today I can't persuade the thing to operate normally, it's stuck at the above scenario.
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I took off the back panel and the power supply shield and made some voltage checks at the marked testpoints on the power modules, they check out reasonably well when loaded by the rest of the scope.
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As there is no "old style" service manual and I'm having trouble finding much info on these scopes I made the assumption 3012A power connections are much the same as the 350Mhz model and checked voltages at J108 on the power supply referring to that section in the service manual. These also checks out reasonably well (n.b. while loaded by the scope, not so if main board is disonnected). From the text I got the impression the voltages are with mainboard disconnected, a misinterpretation on my part probably.
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Main board has a battery, CR2032, I measured battery to 3.05V while in place.
The battery maybe a little weak, what info is lost if I replace it, cal data or user settings ?

So, I need help, any and all comments on what I measured and what to try next, please.
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On Wed, Jan 5, 2022 at 11:10 AM Tommy <tommy@...> wrote:

Greetings from Sweden, Scandinavia!

I'm Tommy, a new member here on groups.io although in the distant past a member at Yahoo.

On my bench I have several "HPAK" instruments, mostly HP brand, aged for 25+ years...

Yesterday I needed a scope and powered up the Agilent DSO-X 3012A, fan starts, Run/Stop blinks twice, entry knob symbol and intensity key blinks, channel 2 button lights up and the ref/math/digital/serial buttons come on, then nothing else.
No display and no reaction to button presses.
There are known issues with boot flash corruption on some models of
Keysight scopes. At some point Keysight would fix the scopes even if
they were out of warranty if they had this particular issue. No idea
if that is still the case. There were subsequent firmware updates
which attempted to reduce the possibility of this issue. If you can
get the scope into the state where it boots again, try to update to
the latest firmware while it is booted.

Several discussions about this issue on the eevblog forum, for example:
!/msg3449446/#msg3449446
 

Thanks Glen for your answer and yes I was afraid of that.

I'll give Keysight a call anyway.

Interesting link, not for the fainthhearted, I'll have to digest that, slowly...
tmillermdems
 

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On 1/5/2022 2:09 PM, Tommy wrote:
Greetings from Sweden, Scandinavia!
?
I'm Tommy, a new member here on groups.io although in the distant past a member at Yahoo.
?

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Main board has a battery, CR2032, I measured battery to 3.05V while in place.

Was the power on or off when you measured the cell voltage?


Regards, and happy new year.

The battery maybe a little weak, what info is lost if I replace it, cal data or user settings ?

So, I need help, any and all comments on what I measured and what to try next, please.
._,Waew_._,_


This email has been checked for viruses by Avast antivirus software.


 

Hi Tommy,

does this scope has a standby mode?

More than once I've seen this sort of behaviour on various products that have standby power and switching supplies. One of the possible culprits is a capacitor that has to transmit startup-power. When they loose capacitance there will be a point where the unit starts sometimes, sometimes not, sometimes only when warm etc.

cheers
Martin
 

On Thu, Jan 6, 2022 at 12:29 AM, tmillermdems wrote:
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Main board has a battery, CR2032, I measured battery to 3.05V while in place.

Was the power on or off when you measured the cell voltage?

Scope was powered off.
 

Thanks for the suggestion but no sleep mode I'm aware of.
 

Update to newer firmware if you can get the scope to boot. You're experiencing NAND corruption which can occur with older firmware. The update will remap the bad blocks(if possible) and provide better recovery options. You should be running firmware 2.65.
 

On 6. Jan 2022, at 14:58, Tommy <tommy@...> wrote:
Thanks for the suggestion but no sleep mode I'm aware of.
Not necessarily a sleep mode.

When the on-off-switch does not cut mains power completely it means the unit is not off but in a standby-mode where some electronics are always active.

cheers
Martin
 

Appreciate your help!

So, I tried booting the scope from a 12V bench supply.

Unfortunately no joy...

The thing draws about 2 Amps while doing nothing, is that reasonable (label says 100W on back panel) ?

On 2022-01-06 17:01, Martin wrote:
On 6. Jan 2022, at 14:58, Tommy <tommy@...> wrote:
Thanks for the suggestion but no sleep mode I'm aware of.
Not necessarily a sleep mode.
When the on-off-switch does not cut mains power completely it means
the unit is not off but in a standby-mode where some electronics are
always active.
cheers
Martin
 

Hi Tommy don't worry,
do nothing more!
Close the oscilloscope and read all the topic that they suggested to you or:
"DSOX2000 and 3000 series - license, have anyone tried to hack that scope?"
Always on EEvblog.
That's the only way to fix your Oscilloscope.
You may need a LAN card for your DSO-X 3012.
I probably have a tutorial for this problem, it will be in italian language
If you want, contact me. (P.M.)
maurizio

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