possible qsc rmx amp problem |
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zigzagwanderer
Registered User Joined: 01 February 2021 Location: sw uk Status: Offline Points: 48 |
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Posted: 19 April 2022 at 8:34pm |
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just bought 2x QSC RMX 4050 amps - the clip light on one channel of one of the amps doesn't illuminate on switch on, nor does it illuminate when i try to drive it into clip. the channel's audio appears to be fine,
we switched the channel connectors over to test the clip LEDs and both have worked so its not the LED itself. anyone know what this could be?
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Conanski
Old Croc Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2515 |
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Did you check and then cycle the dip switches on the back even if they looked like they were set correctly?
Edited by Conanski - 19 April 2022 at 10:18pm |
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zigzagwanderer
Registered User Joined: 01 February 2021 Location: sw uk Status: Offline Points: 48 |
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Ok... 3 hours later, figured it out...
Was a faulty connector cable between the main boards and the pcb with the pots and LEDs. |
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Line Array
Registered User Joined: 19 March 2022 Location: New Jersey, USA Status: Offline Points: 83 |
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ironic because QSC amps don't use a lot of ribbon cables, connectors etc. seems prudent to look for amps that only use the bare minimum number of internal cables, connectors etc. my old QSC PLX is failing at the volume knob pots which sound kind of rusty with sound occasionally dropping out until you fiddle with them a little - those are something i would avoid too if possible. if it's possible to have volume control entirely in the digital domain or at least without any kind of physical contacts that can go bad. basically eliminate as many contacts as possible. what are the most failure prone components in an amp ? it's probably contacts followed by capacitors and power devices only when overdriven or under-cooled. does that sound about right ? what makes an amp reliable ?
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Online Points: 560 |
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But when they do they are utter poo (reference the 1st generation PLX series) |
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zigzagwanderer
Registered User Joined: 01 February 2021 Location: sw uk Status: Offline Points: 48 |
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ok , further to my previous post
I botched the faulty cable to check it worked ok and I now need a replacement cable I think I need a 6 pin female to female JST cable approx 100mm long , the pins are 2.5mm centres. I've looked everywhere I can think of and can't find a suitable cable available in the UK anywhere If possible I'd prefer not to have to make it up and have to buy a crimping tool etc Anyone know where I can source one , the proper QSC one would be nice but I'm not overly fussed as long as its ok quality
Edited by zigzagwanderer - 23 April 2022 at 12:51pm |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Online Points: 560 |
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Could you just solder wires onto the pins? (You can usually pull the plastic housing off the PCB leaving the pins like solder turrets)
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zigzagwanderer
Registered User Joined: 01 February 2021 Location: sw uk Status: Offline Points: 48 |
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Fare point but that would make servicing the pots etc at a later date more difficult as Id have to unsolder the wires to be able to remove the the pcb with the pots on |
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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Found this within 5 minute search: |
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RoadRunnersDust
Young Croc Joined: 03 December 2013 Location: United Kingdom Status: Online Points: 560 |
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Pots on an RMX? You mean there’s something else to do with them other than short the wiper to the input?
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zigzagwanderer
Registered User Joined: 01 February 2021 Location: sw uk Status: Offline Points: 48 |
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Now why couldn't I find that Thank you
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Line Array
Registered User Joined: 19 March 2022 Location: New Jersey, USA Status: Offline Points: 83 |
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my PLX pots are not doing too well ...
could you put in an on/off switch in place of them rather than shorting ? to act as a mute button ? or would the transient be too loud ? also do all pots suffer this fate or not ? the pot on my Benchmark DAC ( a home / studio product ) is only faring slightly better than the QSC one - they're both about 15 years old ... Benchmark is considered very high quality yet still has this problem i wonder if there are some known ways to adjust volume that aren't so problematic. i don't mean to revive my PLX but for future purchases. for example if you control the volume digitally - will you lose bits of resolution ? or is it irrelevant with 24 bits having more resolution than amp has noise floor ?
Edited by Line Array - 23 April 2022 at 7:26pm |
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