Hello, i get a defect Wavesurfer 24MXs-A. At this timwe its opened. I did'not find on a first view something.
Did somebody know where i could find a service manual or at least about the power supply?

best regards, Frank

 

as it seems the powersupply has a 20 pole ATX plug, +5VStandby is on, but i could not switch it on if Ps_on is shortet to GND.
If I'm rigth than my supply is defect - had someone a error like this before?

A serviceplan could be really helpfull.

 

Hello, i get a defect Wavesurfer 24MXs-A. At this timwe its opened. I did'not find on a first view something.
Did somebody know where i could find a service manual or at least about the power supply?

A dead PSU unfortunately is not that uncommon with LeCroy's early 'suitcase-style' scopes (WaveSurfer Xs/Xs-A/Mxs/MXs-A and WaveRunner Xi/Xi-A/MXi/MXi-A), mostly caused due to the high temperature in their confined spaces.

There isn't a lot you can do. The normal procedure is to have the PSU replaced by LeCroy, but stocks are apparently drying up now.

The PSU is custom made by a 3rd party (Cherokee) for LeCroy, and there are no schematics for it outside of Cherokee and LeCroy (not sure if LeCroy even has the schematics).

You can try to repair the PSU yourself, and if you've done that then I'd consider uprating the two cooling fans in the scope to increase the airflow (which helps to reduce PSU temps).

Have you asked Cherokee? Maybe they can offer a repair service (unlikely but worth trying).

 

Hello Würstchenhund ;-) ,
I see your comments and helpful advises in the "other" blog.
my Powersupply is from Cherokee, it has the partNumber SP651-Y05A.
I try to repair the Psu, at this time i had not so much time, also ther PSU components are arranged at minimum space so that pcb- tracing is not so easy.
Also there are inside many of analog parts.
Analog circuit design is not the part, in which im really good.
For first understanding i take the schematic of a Lecoy 6000PSU - but this is for sure not equal to my PSU.
At this time i can switch on my PSU and the fan is switched on for short time ( ca. 0.5s)

I can ask cherokee but i didn't think they would support me.
In the evening i will try to locate the smps IC and try to measure what happend.
Did You know what died in the power supply of this model?

Best regards, Frank

 

Hi Frank,

The WR6000 PSU schematics won't help you as the Cherokee PSU in those suitcase-style scopes is completely different.

If I were you I would give Cherokee a try, maybe they even give you the schematics.

I'll also ask my contacts if we can get the schematics for the PSU.

WH

P.S.: As to the "other" blog, I'm no longer a member there (they kicked me out a while ago)

 

Hi WH,
You are rigth, the PSU schematic for the 600er ist different, but some blocks are more or less the same.
for example same smps and same (more or less ) transformer control circuit is used.....

I can try to go to Cherokee international side from this side (https://www.electronicproducts.com/Companies/Cherokee_International.aspx) it seems as their website is down, but i can find www.pioneermag.com.
I will try contact this company and try to get a repair offer or schematic for the psu.

Frank

Ps.: I did'nt understand why you kicked... ;-) , is this connected with phyton ......?

 

Hi WH,
at the end i was not sucesfull to find / get the rigth schematic for my psu.
But with others schematic, some guessing / analysing the power supply I had found the defect parts.
Last nigth i had some time to work on it. and to replace defect parts in the powersupply.
After replacing and first open tests, i'm very happy - because the scope seems to work.

If i had the next time-gap i will use a signal generatior to see if all channels work properly at maximum frequency.
If all is working correct, then i will think about options recovery especially spi and LIN bus.
Did you know how i can get information about the installed firmware version on scope?

Also i hat some question to you if you know what can be done again the heat inside the power supply / scope to minimize defects by overheating.
better fan?
I'm also an EE and i'm sure some products at your home exist where i'm involved in the developing process.

best regards,
Frank

 

Hello WH or others

I'm also looking for information about the Lecroy ProBus.
The connector information i had found, interesting for me would also the data structure of the I2C field.
On google.io group Lecroy their should be some eedumps of active probes, but for this i had get no access because my subscription has not yet been approved...

So my question, did you know where to get this data ?

Best regards, Frank

 

Hi WH,
at the end i was not sucesfull to find / get the rigth schematic for my psu.
But with others schematic, some guessing / analysing the power supply I had found the defect parts.
Last nigth i had some time to work on it. and to replace defect parts in the powersupply.
After replacing and first open tests, i'm very happy - because the scope seems to work.

Congratulations! You could help others with similar problems by describing your repair as detailed as possible in the Yahoo LeCroy group.

If i had the next time-gap i will use a signal generatior to see if all channels work properly at maximum frequency.
If all is working correct, then i will think about options recovery especially spi and LIN bus.
Did you know how i can get information about the installed firmware version on scope?

Just go in the Status page, it shows the firmware version and the installed options.

Also i hat some question to you if you know what can be done again the heat inside the power supply / scope to minimize defects by overheating.
better fan?

Yes, better fans with at least 30% more airflow will certainly help.

 

Hello WH,
nice to hear from you.
everywhere i look for information i see in some posts your name.

Congratulations! You could help others with similar problems by describing your repair as detailed as possible in the Yahoo LeCroy group.

​

Since yesterday i'm a member at this forum, so i will describe some Infos about repair.
But for the most interesting part, i had no documentation - because i was really short in time ( the repair was done at work - after worktime - and so i had not so much time for documentation of the repair process)​

But i had make some notes and eventually i will open the scope again - if i had enough time i can open the powersupply to make some photos of the location of repaired parts.

At this time i try to find out how the "add key" function work also in newer firmware than 8.x because my Scope has 8.1 so the python files would not work.
And i did'nt know from where to get older firmware.
Did you know where the options are stored in the Wavesurfer 24Mxs?
Did you also know if it could upgraded to Wavesurfer 42 by software?

Also i try to find out some more about the Probus especially the meaning of the 256 byte of eeprom.

The next interesting question would be what is the Lbus and if it is possible to emulate a Ms-250?
But for this i could not find some photos or teardowns..

At first i will try to Sniff around the Xstream SW with IDA Pro....

If you know where to find some Informations let me know.

Best regards,
Frank

 

You can downgrade your firmware easily, all you need is an older version of the XStream package. I'd ask at the same place that had these python files, I'm sure some people there have a backup of the old XStream software.

Sorry, there were no BW upgrades for these scopes. Also, I don't know of accessible documentation for ProBus or L-Bus (which I believe is PCI-based), but I doubt you can simply rebuild a MS-250 logic pod which is quite a complex piece of kit.