Electronics > Repair
W&G sna-20/23 spectrum analyzer repair
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Gerhard_dk4xp:
The date and bios data are all handled only in the Dallas clock chip.
Have you re-batteried it and broken something in it?

The orange battery plays no role in this.

I have just taken the SNA-33 on the table again and  saw that I have damaged
an U.FL or SMP plug on a thin coax that comes from the yig filter :-(
No Idea where it belongs. I'll take more photographs!

Pude:
Yes it is possible that I've done something wrong while adding button cell into Dallas RTC. It was just a quick fix and have to look into that more. This cell is parallel to original battery. I have not finished this as you may see in the picture, the cell is flapping around in the breeze. :)
dxl:
So i bought the SNA-33 from electro4lease - they sent me pictures of the damage, and it's yet another bloody battery corrosion issue. I guess the mainboard is non-repairable. Not sure how often these boards show up, but i guess not often. So would be interesting to transplant another mainboard in there, but that would likely require a lot of reverse engineering how the interface to the SA looks like.
dxl:
The 'hdd backup from H series' has two interesting files:

GERPC.MAP - map file with all the function names for the pc software
ZZDSP.MAP - map file for the DSP

I haven't checked whether they match the GERPC exe file, but it gives at least an idea what functions are present...

EDIT: After a quick check it looks like it's matching GERPC.EXE. So happy reverse engineering! :)
Pude:
Welcome @dxl to this SNA-33/20/23 club. You were a little bit faster buyer than me. My lunch break was too much. ;) But anyway this troubleshooting is always nicer with larger group.
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