Astron RS-12A Repair Help
On Saturday, January 18, 2003 at 12:10:59 AM UTC-8, Roger Leone wrote:
Woods: Power supplies like yours are pretty easy to repair, but the best way is not to randomly replace parts. There are many possible problems and you need to approach the troubleshooting in an organized way, eliminating what is working and moving on to what isn't. You will need a volt/ohmmeter for this work. Here is a link to a schematic that works: http://www.repeater-builder.com/rbtip/rs12a.html As a previous poster suggested, check to see if you have AC coming out of the transformer. If you don't, check the fuse and switch on the primary side. If they are good and you still have no AC out of the transformer, and all the wiring seems OK and you have 117 volts AC going in the primary, then the transformer may have an open secondary winding. This is unlikely, but you should check to be sure. If the transformer is bad, you need to decide how badly you want to repair the supply, as that is the most expensive part. |
Astron RS-12A Repair Help
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Astron RS-12A Repair Help
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Astron RS-12A Repair Help
On Thu, 18 Jan 2019, Allodoxaphobia wrote:
On Thu, 17 Jan 2019 09:41:03 -0800 (PST), wrote: On Saturday, January 18, 2003 at 12:10:59 AM UTC-8, Roger Leone wrote: I am having similar problems with my RS12 supply. ... then you should start a new thread instead of replying to a FIFTEEN YEAR-OLD THREAD! Some people seem to think everything related should be "kept in one place" to make it easier for others to find. What's forgotten is that the only way someone finds these old threads is by searches (I can't believe they scroll back through 16 years of messages), and if they can find a message from 2003, the same sort of search would find a new thread started today. Michael |
Astron RS-12A Repair Help
Michael Black wrote:
On Thu, 18 Jan 2019, Allodoxaphobia wrote: On Thu, 17 Jan 2019 09:41:03 -0800 (PST), wrote: On Saturday, January 18, 2003 at 12:10:59 AM UTC-8, Roger Leone wrote: I am having similar problems with my RS12 supply. ... then you should start a new thread instead of replying to a FIFTEEN YEAR-OLD THREAD! Some people seem to think everything related should be "kept in one place" to make it easier for others to find. What's forgotten is that the only way someone finds these old threads is by searches (I can't believe they scroll back through 16 years of messages), and if they can find a message from 2003, the same sort of search would find a new thread started today. The problem is not created by people but by the ridiculous "Google Groups" interface to usenet news. It archives news forever, then allows people to search it and send replies, without any clear indication that they are replying to very old news. There should be an extra warning when replying to an old thread, or it should be disallowed entirely. Even those that ask the questions are unlikely to ever come back to read the replies. They were just searching the internet, found the article on Google Groups that they do not regularly visit otherwise, ask a question and move on in their search. It is unlikely that they can find back the same Google Groups site 3 days later to read a reply. So it is best to just ignore those replies to old threads from people with @gmail.com. I have even setup a killfilter so I don't see them. (unless others again reply to them) |
Astron RS-12A Repair Help
In article ,
Rob wrote: Even those that ask the questions are unlikely to ever come back to read the replies. They were just searching the internet, found the article on Google Groups that they do not regularly visit otherwise, ask a question and move on in their search. It is unlikely that they can find back the same Google Groups site 3 days later to read a reply. I am willing to forgive people for replying to such old threads. If I have an idea that might help, I'll provide it. But you are correct. There is seldom any further response. And if I research the thread, I often find it is an old thread I previously replied to, and provided the same suggestion. I suspect they expect replies by E-Mail, so there is no need to come back! Fred |
Astron RS-12A Repair Help
On 1/20/2019 9:52 AM, Fred McKenzie wrote:
In article , Rob wrote: Even those that ask the questions are unlikely to ever come back to read the replies. They were just searching the internet, found the article on Google Groups that they do not regularly visit otherwise, ask a question and move on in their search. It is unlikely that they can find back the same Google Groups site 3 days later to read a reply. I am willing to forgive people for replying to such old threads. If I have an idea that might help, I'll provide it. But you are correct. There is seldom any further response. And if I research the thread, I often find it is an old thread I previously replied to, and provided the same suggestion. I suspect they expect replies by E-Mail, so there is no need to come back! Fred I've occasionally fallen into that also, replying to an ancient posting. But as I get older it can be nice to see, when I find I am saying the same thing I did years ago! Bob W, WA9D |
Astron RS-12A Repair Help
I will post to a new thread. I found this thread through a google search and didn't think it was such a big deal to reply to an old thread. My apologies.
Ross AD6OE |
Astron RS-12A Repair Help
On Sun, 20 Jan 2019 10:15:54 -0800 (PST)
wrote: I will post to a new thread. I found this thread through a google search and didn't think it was such a big deal to reply to an old thread. My apologies. Ross AD6OE It's not a big deal. It just so happens that there's a worldwide shortage of things to be outraged about ATM, so people jump on whatever they can get. |
Astron RS-12A Repair Help
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Astron RS-12A Repair Help
Introductory Information on Astron Power Supplies
by Repeater Builders Technical Information Page (RBTIP) * Compiled from a number of different sources * http://www.repeater-builder.com/astr...tro-stuff.html Schematics and Service Information on Astron™ Power Supplies by Repeater Builders Technical Information Page (RBTIP) http://www.repeater-builder.com/astr...ron-index.html Regulated Linear Power Supply Construction What's inside your Astron®? by David Metz, WA0AUQ http://www.repeater-builder.com/astr...on-article.pdf Power Supply Analysis using Astron DC Supply Hands On Radio, QST magazine by H. Ward Silver, N0AX http://www.repeater-builder.com/astr...y-analysis.pdf === The Illuminated Rocker Switch, used as Power Switch on Astron RA and RM-series DC power supplies, The Neon Bulb within the switch series has a lifetime of ~20 years, comparable to LED devices. Astron uses the appliance standard-sized (.480" x 1.072"; 12.19mm x 27.23mm) switch cutout. Illuminated (neon) Rocker switch, LRA211-RS-B/125N (translucent red). http://www.carlingtech.com/sites/def...ls_&_COS_0.pdf This switch size is widely available from electrical, electronic, appliance part distributors (Mouser, DigiKey, Newark, Allied, Future, NTE Electronics, GC Electronics/Waldom) and manufactured by: C&K, Carling, Cherry, Alcoswitch, and numerous Eastern Asia shops. I have seen prices for this illuminated Carling LRA211 Rocker Switch from $2.00 to $15.00 each. BE a SMART Shopper. The higher priced rocker switches are usually found at electrical or appliance distributors and "convenient” retail hardware locations (example: Jandorf brand name). NTE Electronics : Illuminated Rocker Switches PART Number: 54-065, this is the Carling LRA211-RS-B/125N (translucent red).. https://www.nteinc.com/switches/pdf/rocker-illum.pdf GC Electronics product (35-3740) is a good compromise of price and convenience. http://www.gcelectronics.com/order/Catalog_PDF/2007 Catalog 120407 294.pdf The GC part (35-3740) is the Carling “Curvette” LRA series, specifically LRA211-CR-B/125N (ruby red) LRA211: 125V Neon Lamp; 16A 125VAC; .250 QC Tabs; OFF-NONE-ON (SPST); Red Clear, Black bezel. |
Astron RS-12A Repair Help
Test a Transistor with a Multimeter.
Written by Eli, Vetco Electronics by Thursday, May 04, 2017. Ask any field or bench technician what their most-used piece of test equipment is and they will probably say a VOM (VoltOhm Meter) or DMM (Digital MultiMeter). These versitiale devices can be used to test and diagnose a wide range of circuits and components. In a pinch, a DMM can even substitute for expensive, specialized test equipment. One particularly usefull skill is knowing “How to Test a Transistor” using a Digital Multimeter. Specialized component analyzers exist to do this task, but the expense can be difficult to justify for the average hobbiest. https://vetco.net/blog/test-a-transi...04-12-25-37-07 For ASTRON DC Power Supplies, you can TEST: 1.) Pass Transistors (2N3055 or 2N3771) on Rear HeatSink. 2.) Diodes and Bridge Rectifier used on the 18 VAC secondary from transformer. 3.) For Continuity and Shorts. |
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