void kryo 5.5 / ram s4004 problem |
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Marko
Registered User Joined: 28 January 2009 Location: Croatia Status: Offline Points: 274 |
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how much W is the bulb?
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Some power supplies won't behave when being tested using the lightbulb method. When the amp draws current, the resistance of the lamp causes the supply Voltage to the power supply to drop and could cause it to 'brown out' and the power supply shuts down. Current drops, supply Voltage rises, power supply turns back on and what you end up is a very expensive flashing light controller!
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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i think it's a 100w bulb.
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Marko
Registered User Joined: 28 January 2009 Location: Croatia Status: Offline Points: 274 |
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what Chris said...
you can avoid this by using higer wattage bulb but then you probably loose the point of the bulb, if something in the amp need to blow it will blow... |
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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just to bring this back up.. this amp went on the shelf of mistrust since new years, but as i said above it's always worked in the workshop since then. but the other day did a freebie gig for the climate change picnic thing here, so figured i'd bring it and the martin w3s again for a test run. ran them as side fills, ran them hard on live music, amp didn't miss a beat all day.. so i'm going to assume something weird about the new years' venue's power supply was the cause of the weirdness.
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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hah. this amp has been on the shelf since then i think. today used it in the workshop as i was testing a crossover.. and it worked fine. shut it down, started it up and the power light started flashing.. googled it.. and found my own thread i'd completely forgotten about haha. sigh..
wow that was 3 years ago.. guess its' still an issue with this amp |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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it hasn't improved with age then, unlike alot of what comes from Spain.
There are 2 wire jumpers you can pull off to check if it's an output fault. The psu should run seperately from the output section. Discharge caps before reconnecting. Edited by kedwardsleisure - 13 March 2017 at 8:10pm |
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Kevin
North Staffordshire |
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jumps
Registered User Joined: 15 May 2009 Location: Portugal Status: Offline Points: 385 |
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we ve had problems like the one you describe.
And after a lot troubleshooting we got to the guess conclusion it was bad grounding. |
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jumps
Registered User Joined: 15 May 2009 Location: Portugal Status: Offline Points: 385 |
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this on normal operating condition when it was not pcb design fault and they blew up
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simonp1100
Young Croc Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1103 |
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Had one of these a while back for repair. Both IGBT's were blown on switchmode as well as the driver chip & PWM chip on the driver plug in card and a few loose PSU caps.
As Kev has said already, the main problem with this amplifier is the very close tracks around the heatsinks hence easy for flashover and moisture to get in. Bit of a bugger of an amplifier to repair if it's not the PSU. Design was not good around this area i feel, too many tracks so close together. Edited by simonp1100 - 15 April 2017 at 12:16pm |
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