EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: aseok on September 30, 2019, 06:23:15 am
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Hi.
I have a sna-20 and sna-23 spectrum analyzers from wandel & goltermann, both facing problems and need repair.
sna-20 has hard drive controller failure error.
sna-23 has problem of sending incorrect lcd data and hdd related problem.
both have compensation data floppy disks but problem doesn't solve by running compensation software.
Has anyone experience of repairing these systems?
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After inspecting for a couple of days and replacing some parts, it seems that i need installation firmware of these SAs, say, SNA-20 and SNA-23.
Does anyone have the related firmware/floppy disks?
Thanks.
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HI aseok,
Can I get a copy of your compensation data floppy disks ?
I have a SNA 23 , but no boot disk, I have changed backup battery, but would like to try to boot from floppy disk,
to restore my data in B: drive ,
I woud like to share our findings with our analyzers, and solve them,
regards helge
kyndbo@gmail.com
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As you know, all floppy data sectors must be copied and pasted in a floppy to work.
What is the hard drive of sna 23? does it boot from cf card?
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Hello guys,
were you able to repair your analyzers?
Ive repaired one of these lately and uploaded photos and the hdd backup to xdevs.com.
But my SNA23 is from the H series without the ram. Just one HDD.
All the stuff is here:
https://xdevs.com/doc/WG/SNA23/
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I have a SNA-33 that has a floppy and a battery-powered ramdisk. It still
boots, but I was thinking that I had destroyed the input. Seems not to be
the case, but it is still completely deaf. I must look into this soon now, :-[
Gerhard
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Seems not to be
the case, but it is still completely deaf.
My unit was also completly deaf. The trace was visible but no signals. The error was the missing -6.8V power supply rail. There was a broken diode in the power supply. After changing the diode the unit worked flawless again
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Hi
Would you please send a picture including HDD attached in place? my sna23 is missing hdd and i thought that the compact flash is the main memory.
Thanks.
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There is an HDD image here:
https://xdevs.com/doc/WG/SNA23/hdd%20backup/
You can burn it with HDD Raw Copy Tool
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my sna23 is f series, is it compatible with your image?
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Is it the hdd connector? another point is that i have a 60GB hdd, can i use that?
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Yes that is the IDE connector. I dont know if the image will workfor you but there are good chances. But a 60gb HDD will not work.
I noticed that just 512mb are working correctly. There is a limit defined by the bios. I installed a CF Card to IDE adapter with a 512 MB card.
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What does cf card do beside hdd? is it necessary?
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As the connector is 50 pin, how should 40 pin ide connect to it?
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Maybe SCSI???
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It is IDE. The spare pins are not connected or connected to the hdd jumpers.
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Seems not to be
the case, but it is still completely deaf.
My unit was also completly deaf. The trace was visible but no signals. The error was the missing -6.8V power supply rail. There was a broken diode in the power supply. After changing the diode the unit worked flawless again
Would you please send a video of your sna from booting up to main software start?
Thanks.
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Here is the a video of the start up:
https://youtu.be/-rusvtIUkgI
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Hello everybody,
in case somebody could advise : I have a SNA-23 and facing BOOT problem. I use the disk but when the process is finished it keeps looping again asking for the disk.
thanks a lot,
Nikos
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It is IDE. The spare pins are not connected or connected to the hdd jumpers.
does 40 pin ide connect at the middle of 50 pin connector, symmetrically?
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Hello everybody,
in case somebody could advise : I have a SNA-23 and facing BOOT problem. I use the disk but when the process is finished it keeps looping again asking for the disk.
thanks a lot,
Nikos
Hello
What is the version of your sna? what is main memory?
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does 40 pin ide connect at the middle of 50 pin connector, symmetrically?
No. Take a look at that picture i posted. You need to connect it at the 44 pin side. Just leave the 4 power supply pins empty. The 4 power supply pins are on the left side.
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HI aseok,
Can I get a copy of your compensation data floppy disks ?
I have a SNA 23 , but no boot disk, I have changed backup battery, but would like to try to boot from floppy disk,
to restore my data in B: drive ,
I woud like to share our findings with our analyzers, and solve them,
regards helge
kyndbo@gmail.com
Hi kyndbo
Which version is your sna? does it have dram module?
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It is IDE. The spare pins are not connected or connected to the hdd jumpers.
which pins are 1 and 44?
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There is a project RASCSI that uses raspberry pi as scsi hard disk emulator and is originally written and tested for sharp x68000 & mac pcs. i wonder if we can use it with our SNAs.
https://github.com/akuker/RASCSI
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Hello again , best greetings to all.
I think you need the model and is SNA-23 with a 8 MB memory....
tnx a lot