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Electronics => Repair => Topic started by: aseok on September 30, 2019, 06:23:15 am

Title: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on September 30, 2019, 06:23:15 am
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?

Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 29, 2019, 11:50:30 am
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.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: kyndbo on December 29, 2019, 06:18:32 pm
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
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on December 30, 2019, 04:55:40 am
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?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on October 26, 2020, 07:20:27 pm
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/
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Gerhard_dk4xp on October 26, 2020, 10:51:19 pm
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
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on October 27, 2020, 09:52:30 am
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
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 17, 2020, 02:39:24 pm
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.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on November 17, 2020, 05:01:08 pm
There is an HDD image here:
https://xdevs.com/doc/WG/SNA23/hdd%20backup/

You can burn it with HDD Raw Copy Tool
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 17, 2020, 05:50:26 pm
my sna23 is f series, is it compatible with your image?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 17, 2020, 06:38:15 pm
Is it the hdd connector? another point is that i have a 60GB hdd, can i use that?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on November 17, 2020, 09:05:07 pm
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.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 18, 2020, 08:59:54 am
What does cf card do beside hdd? is it necessary?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 18, 2020, 06:17:20 pm
As the connector is 50 pin, how should 40 pin ide connect to it?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Gerhard_dk4xp on November 18, 2020, 06:26:37 pm
Maybe SCSI???
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on November 18, 2020, 07:08:49 pm
It is IDE. The spare pins are not connected or connected to the hdd jumpers.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 19, 2020, 07:42:09 am
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.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on November 19, 2020, 08:52:38 am
Here is the a video of the start up:
https://youtu.be/-rusvtIUkgI
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: NIKGEROS on November 19, 2020, 11:14:17 am
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
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 19, 2020, 01:07:13 pm
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?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 19, 2020, 01:09:38 pm
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?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: Qw3rtzuiop on November 19, 2020, 06:14:44 pm
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.
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 20, 2020, 06:00:06 am
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?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 20, 2020, 08:44:00 am
It is IDE. The spare pins are not connected or connected to the hdd jumpers.
which pins are 1 and 44?
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: aseok on November 24, 2020, 11:16:49 am
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
Title: Re: W&G sna-20/23 spectrum analyzer repair
Post by: NIKGEROS on December 17, 2020, 06:34:03 am
Hello again , best greetings to all.
I think you need the model and is SNA-23 with a 8 MB memory....

tnx a lot