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DIY For Audio
Help me "flick a relay" (QSC USA 1300 Amplifier)
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<blockquote data-quote="Ampdog" data-source="post: 62864" data-attributes="member: 144"><p>Ghostin,</p><p></p><p>Firstly I would examine the relay and check whether it is operating! I would imagine there is a voltage or something printed on the coil or cover. It should be easy for you to disconnect one end and try working it with an outside power supply to get a on-off click (no signal etc.) Also check the contact resistance as said above. Then you have some pretty high resistors in there: R19, R20 and even R21. You might want to clean up the PCB surface around there - perhaps all-over! Early candidates for my investigation would also be the PTC resistor and zeners. As you will realise further hints quickly become hazy. </p><p></p><p>If you cannot get it right with this and you are interested, let me know and I can simulate the circuit for you. It is a mite difficult to work out by sight what voltages should exist where.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 62864, member: 144"] Ghostin, Firstly I would examine the relay and check whether it is operating! I would imagine there is a voltage or something printed on the coil or cover. It should be easy for you to disconnect one end and try working it with an outside power supply to get a on-off click (no signal etc.) Also check the contact resistance as said above. Then you have some pretty high resistors in there: R19, R20 and even R21. You might want to clean up the PCB surface around there - perhaps all-over! Early candidates for my investigation would also be the PTC resistor and zeners. As you will realise further hints quickly become hazy. If you cannot get it right with this and you are interested, let me know and I can simulate the circuit for you. It is a mite difficult to work out by sight what voltages should exist where. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Help me "flick a relay" (QSC USA 1300 Amplifier)
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