| Electronics > Repair |
| W&G sna-20/23 spectrum analyzer repair |
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| Pude:
I attach the screen captures of my bioses. VGA bios is different from Amibios I think. |
| robots:
Hi, from what i understand in bios you should select harddisk as NONE! The memory board (with flash memory) has its own bios that gets loaded and hooked to the main bios as harddisk controller. Its also written in the service manual :-) |
| Gerhard_dk4xp:
I have set it to disk type "none" and now it boots from the disk replacement right into the zebra stripes. Funny enough, the disk type used to be 8, just like the photos by Pude and NIKGEROS. Gerhard |
| Pude:
Thank you @robots about that hard drive setting info. I'll set it later. Some progress with my SNA-33: - I made RGBtoHDMI-board to work together with Raspberry zero. Actually I made a few of those. [pic 1] - Connecting RGBtoHDMI to SNA's EGA monitor connector I got signal out! [pic 2] Picture changed when pressing buttons and all that stuff so the software is working properly. Monitor signals are bad. - But EGA picture frequency was something not to be viewed properly. Sometimes when I tried to change some RGBtoHDMI settings picture was even readable! [pic 3]. But normally it was just rolling all the time. - I started to check signals on the Monitor controller board underneath the main processor board. I think that some chip(s) are bad there. This is in work in progress state. Here I've soldered wires in the legs of U46 chip. That's PAL chip but I have to add more wires in other chips too to get proper understanding about frequency prosessing. [pic 4] Otherwise I boot my SNA from USB stick to MS DOS. Then change drive C: and run autoexec.bat. I think the file system is correct and working ok. I'll take some backups later and upload those some place. |
| Storm:
Hi guys, I currently have a SNA-23 H-Series in Restauration and would like to ask if someone here in the forum has access to the respective Service Manual and/or User Manual? BTW, the Zebra-Stripes come from uninitialized LCD Controller. It is Part of the DOS-Boot process and normally initiated by a batch file. I am currently working on replacing the HDD with a flash DOM, which works only with a specific drive-type. I noted that it is not possible to save newly detected HDD types to CMOS-RAM, my SNA-23 always defaults to a specific HDD-config. Does anybody else with a H-Series Model see this as well? |
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