Author Topic: Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply  (Read 900 times)

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Offline OH2LIY

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Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply
« on: November 05, 2018, 07:35:49 pm »
Hello, once again my R&S FSIG SA refused to work. This time symptons was just blinking stby led. This was 3. or 4. time when this SA was broken. Every time I have managed to find and fix broken components.
Once again I grabbed manuals and find that there is only very short description of power supply functions, not even block diagram, only voltages&pins was described. Just to remove PS from SA takes closer to one hour. After that, fun begins. Opening power takes other hour... After long and hard thinking and testing, I did managed to find short circuited ceramic cap. Capasitor was between 4/8 pin on CA258 (LM358) and it short circuited +12V and -12V lines. 
After replacing cap, stby power started nicely and also main power started after pressing front panel main switch!

 

Offline pinyoro

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Re: Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply
« Reply #1 on: November 05, 2018, 09:11:08 pm »
Well done!

Sent from my WAS-LX1A using Tapatalk

 

Offline Huluvu

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Re: Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply
« Reply #2 on: November 05, 2018, 09:22:44 pm »
Long time not seen our PSU for R&S  8)
Must be almost 15 years old  :-+
Can you please take a picture of the label at the side of the PSU
"Yeah, but no, but yeah, but no..."
 

Offline OH2LIY

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Re: Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply
« Reply #3 on: November 07, 2018, 05:14:17 pm »
My mistake, I didn't take photo from label (actually, I did this repair over month ago and last weekend was time to fix HDD, and again I did have to remove power and so on). I'll take photo next time (hopefully not too soon)...


Ramppa
 

Offline OH2LIY

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Re: Fixing Rohde & Schwarz FSIG (FSEA, FSIQ...) Ascom power supply
« Reply #4 on: November 07, 2018, 05:15:30 pm »
Huluvu, forget to ask, but do you have schematics for PS?


Ramppa
 


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