| Electronics > Repair |
| W&G sna-20/23 spectrum analyzer repair |
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| dxl:
I zipped the firmware of my SNA-33 and uploaded it to ko4bb. It's a revision G model, so different from the H model we already have. I tested whether the H software runs on a G model, and it does. |
| dxl:
One thing that wonders me on my unit is whether the fan is working. The one in the Power supply seems to be working, but the other one next to the mainboard in the back doesn't do anything. I haven't checked the schematics whether that one is temperature controlled or so. Pude, Gerhard, is that one working on your units? |
| Qw3rtzuiop:
--- Quote from: dxl on October 17, 2022, 04:03:37 pm ---One thing that wonders me on my unit is whether the fan is working. The one in the Power supply seems to be working, but the other one next to the mainboard in the back doesn't do anything. I haven't checked the schematics whether that one is temperature controlled or so. --- End quote --- Its temp controlled. Heat up the marked NTC/PTC(?) and it should start spinning. |
| dxl:
Thanks, the fan is working. I applied some heat and it started spinning. Odd place IMHO given that the power supply has its own fan, and that area doesn't get much airflow from the fan. |
| dxl:
I was wondering why the sweep update rate is slower than on a HP8563E. With the information from the map files i partially reversed the communication protocol between the software and the dsps. It's quite interesting that the sweep only takes 25ms, but the processing between sweep takes almost 75ms. Look at the green and blue cursor lines in the listings, this is one sweep. I wonder whether this could be improved with a more modern mainboard. |
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