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Download ASTRON RMA RMM RSA RSM V 25A POWER SUPPLY service manual & repair info for electronics experts. Download ASTRON RS35M service manual & repair info for electronics experts. ” TIP CAS. I ca IN ICAO. PвKE. | 39A. LM CR3 |. 3 A4. | IN 1 tci +. CI01 +. R8. 3 K. 10v. SCRI I.

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I provided my serial number and they were able to tell me it was manufactured in May serial: Searched all over for copy of whatever manuals might have been available but cannot find anything. If you can’t find the schematic of the RSM, let me know. But this means that the line-cord on the power supply is also acting as the safety bond for the device I will say computer, instead of radio.

If you have grounds on your radio equipment at other places like the antenna, tower, coax you are creating two earthing ground return paths of different capacity and with ever so slight differences in potential. To open downloaded files you need acrobat reader or similar pdf reader program.

Astron RSM Manual

Checked earth safety ground to chassis resistance: Icom America does answer their telephone for support calls. Is this the correct site? Now I’m hoping that older units were built better and this one will last me a good long while. Because the ground conductors are also of different gauges wire size the DC return current from the radio is now also going to be trying to share the connection through the earth ground system. I had called Astron but they were not very helpful, only saying “it depends” and not offering any rationale.

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The last I checked Astron website had schematics of all their linear power supplies. I’m thinking maybe the Astron should be set that way too if iCOM designed their “system” that way.

July 28, April 27, This creates what is known as a “ground loop” that can introduce AC hum in to the DC supply ground return leg. Instead, contact your nearest service center!

Good luck to the repair! You can write in English language into the forum not only in Hungarian! May 18, For some new radio amateurs English is a second language, and can better understand some electronics concepts and repairs via video YouTube instruction or pictorial diagrams. It appears you have a handle on operating the unit, even to the point of correcting meter errors.

Usually this would be much more pronounced on instrumentation loops industrial control with pressure transmitters operating off of a mA current loop for example.

Astron VS-35M Variable DC Power Supply gets an upgraded MOSFET over-voltage circuit

These free programs can be found on this page: If this is the reason, announce it with the blue man icon on the top and I remove it. Maybe I need to try someone else there. If this is something like a radio or a piece of industrial process equipment where there are distributed connections to the earthing system majual it can introduce problems.

Dragging up an old topic. Had a typo above corrected in red. The only other related thread I found so far is: Also checked negative side of DC output: The problem had been there for years but it was due to a fault in the way the substation was designed.

You can login to do that! I have seen this happen with a substation where we have this gigantic buried ground mesh. I found that site and referenced it above also.

Repairing the Astron RSA http: Looking for other manual? On further searching, I found a wealth of info here: When you get a transient lightning, fault, normal device switching it can behave in difficult to predict ways.

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The manuwl way to find out is to try it I guess.

This file is downloadable free of charge: Please, do not make a copy of the downloaded manual and do not offer to sell it, just use personally to repair defective appliance! While the Astron Linear PS designs have changed through the years — largely due to changes in electronic components RoHS, obsolescence, etc.

Two white LEDs with a single dropping resistor is all that is needed. The Astron website appears to only have a catalog and no support information. Trying to balance out our three phase loads we noticed that there was an unaccounted for power loss.

How to contact Icom America Technical Support: As for illuminating the meter, that is a piece of cake. We’ll see you manuql a couple of weeks it’s that deep of a bench.

Astron VSM DC power supply

As for manuals, I wasn’t aware they had one or why a person would need one. Picked up a used RSM. Not too much in there but you can never have too much info.

I also thought maybe my meter lights were burned out, as some have noted, but on further searching found that since my unit has a fixed power cord, it’s likely older and never had meter illumination. Powered by SMF 1.

Astron sent me a manual in e-mail. If you are not familiar with electronics, do not attempt to rs-35,