Author Topic: W&G sna-20/23 spectrum analyzer repair  (Read 1488 times)

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Offline aseok

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W&G sna-20/23 spectrum analyzer repair
« 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?

« Last Edit: November 30, 2019, 07:56:06 am by aseok »
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #1 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.
 

Offline kyndbo

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #2 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
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #3 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?
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #4 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/
 

Offline Gerhard_dk4xp

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #5 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
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #6 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
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #7 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.
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #8 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
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #9 on: November 17, 2020, 05:50:26 pm »
my sna23 is f series, is it compatible with your image?
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #10 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?
« Last Edit: November 17, 2020, 06:41:04 pm by aseok »
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #11 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.
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #12 on: November 18, 2020, 08:59:54 am »
What does cf card do beside hdd? is it necessary?
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #13 on: November 18, 2020, 06:17:20 pm »
As the connector is 50 pin, how should 40 pin ide connect to it?
 

Offline Gerhard_dk4xp

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #14 on: November 18, 2020, 06:26:37 pm »
Maybe SCSI???
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #15 on: November 18, 2020, 07:08:49 pm »
It is IDE. The spare pins are not connected or connected to the hdd jumpers.
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #16 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.
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #17 on: November 19, 2020, 08:52:38 am »
Here is the a video of the start up:
https://youtu.be/-rusvtIUkgI
 

Offline NIKGEROS

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #18 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
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #19 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?
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #20 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?
 

Online Qw3rtzuiop

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #21 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.
« Last Edit: November 19, 2020, 06:17:08 pm by Qw3rtzuiop »
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #22 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?
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #23 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?
 

Offline aseok

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Re: W&G sna-20/23 spectrum analyzer repair
« Reply #24 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
 


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