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Modular Amps
Egnater / Randall Modular Amps
Opinion needed on troubleshooting RM50 please-Relay problem?
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<blockquote data-quote="RomanMtz" data-source="post: 120726" data-attributes="member: 3176"><p>So I recently discovered that there?s a problem with the first module slot of my RM50. I didn?t notice it at first because I was mainly using a KH-3 in there with a lot of gain.</p><p></p><p>I noticed it when I installed a KH-1 in the first slot. There?s this weird grainy distortion that is very noticeable as notes fade out. As if you had a really crappy noise gate installed and it would cut out low signals with grainy distortion. This happens mainly at low volumes with low gain. If I raise the gain, volume, and play harder the problem is hidden but not eliminated.</p><p></p><p>This only happens on the first module slot. I have confirmed it?s not the module itself because if I install the same module on slot two it works fine. Also, installed by itself on slot one it works fine with the channel switch button pressed (like selecting channel 2 but since there?s nothing there, it still sends signal), but when I depress it, the problem returns.</p><p></p><p>From this test, I?m thinking the culprit is the relay that passes signal (RL2 on the schematic) when switching occurs.</p><p></p><p>I took the amp apart and physically all the connections looked good, no cold solder joints, shorts or open circuits. The blue slots where the modules are inserted look perfects as well (even used a little deoxit on the module and inserted it a couple of times to clean.)</p><p></p><p>Since relays are electromechanical and more prone to failure, I?m thinking that?s the problem. I was not able to find a direct replacement for the relays here (only could find in Europe) which it this one:</p><p></p><p>http://www.tme.eu/html/EN/subminiature-relays-rsy-series/ramka_1986_EN_pelny.html</p><p></p><p>But I did find this, which by the spec sheet, looks identical:</p><p>http://www.alliedelec.com/search/productdetail.aspx?SKU=70175802</p><p></p><p>Any opinions on my troubleshooting?</p><p></p><p>I can get some audio recordings of the problem if it could help? Thanks in advance!</p></blockquote><p></p>
[QUOTE="RomanMtz, post: 120726, member: 3176"] So I recently discovered that there?s a problem with the first module slot of my RM50. I didn?t notice it at first because I was mainly using a KH-3 in there with a lot of gain. I noticed it when I installed a KH-1 in the first slot. There?s this weird grainy distortion that is very noticeable as notes fade out. As if you had a really crappy noise gate installed and it would cut out low signals with grainy distortion. This happens mainly at low volumes with low gain. If I raise the gain, volume, and play harder the problem is hidden but not eliminated. This only happens on the first module slot. I have confirmed it?s not the module itself because if I install the same module on slot two it works fine. Also, installed by itself on slot one it works fine with the channel switch button pressed (like selecting channel 2 but since there?s nothing there, it still sends signal), but when I depress it, the problem returns. From this test, I?m thinking the culprit is the relay that passes signal (RL2 on the schematic) when switching occurs. I took the amp apart and physically all the connections looked good, no cold solder joints, shorts or open circuits. The blue slots where the modules are inserted look perfects as well (even used a little deoxit on the module and inserted it a couple of times to clean.) Since relays are electromechanical and more prone to failure, I?m thinking that?s the problem. I was not able to find a direct replacement for the relays here (only could find in Europe) which it this one: http://www.tme.eu/html/EN/subminiature-relays-rsy-series/ramka_1986_EN_pelny.html But I did find this, which by the spec sheet, looks identical: http://www.alliedelec.com/search/productdetail.aspx?SKU=70175802 Any opinions on my troubleshooting? I can get some audio recordings of the problem if it could help? Thanks in advance! [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
Opinion needed on troubleshooting RM50 please-Relay problem?
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