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Power supply M500 carver

Fuse blow. checked bridge diode, capacitors. but question is how fuse keep blow?

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  • chiengo Jan 11, 2008

    not a slution.

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If you still need help on the Carver, try replacing the three terminal device "Triac" on the chassie on the power supply side.. Opening all of the collector connections on the output transistors will allow you to power the unit up without the major load on the power supply. Check the emitter base junctions with a analog meter on the X1 scale. You will generally get a half scale reading in one direction and an open circuit in the other. A good analog meter can be had at Lowes or probably Home Depot for about $20.00. I'll check back here in a few days. If you still need help, I'll set up an email address. I can describe the power supply circuit to you as well. The power supply is where the triac is used to control the output voltage to the output transistors.

Posted on Oct 14, 2008

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I have the same problem. Worked fine then I sold it on eBay and the guy had the problem with it. I took the amp back. Let me know if you find anything out.

Posted on Feb 04, 2008

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Check the output transistors

Posted on Jan 11, 2008

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Crest audio ca4 blowing fuse


There is two possibillities to fuse blown off due to hi current flowing through fuse more than 3amp.because power supply componant like rectifying diode, filter capacitor or regulator ic ,regulator transistor shall be short circuited.
if you are tech......just remove amp. supply.from main power supply...try with another fuse........if fuse ok, fault is amp side, or if fuse blow off ...power side problem just....maximum fault comming on varistor ,diode, filter capacitor, .........
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Fuse keeps blowing in my philips 32pfl3505d/f7 tv


Good day!!!!


That problem is cause of shorted bridge diode or power mosfet..

just see the picture below to see the image of bridge diode and power mosfet..

bugoy31_16.jpg

If you don't have a tools or you have no electronic background you only have to is order the new power supply board..

I hope this solution will be helpful..Thanks for using fixya....

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The resistor is acting as a fuse and will continue to blow until you fix the REAL problem. LIKELY the filter capacitor(s) beyond the bridge rectifier are failing. One needs to use test equipment to measure the current through the resistor and see if it is reasonable. The capacitors can heal briefly and then start to short. One should also check the rectifier in operation with an oscilloscope as one diode could intermittently short.

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Hi,
Your fuse blown again because you have a short on the circuit. You may visit my link http://www.fixya.com/support/r8053361-fuse_keeps_blowing for more info.
I've suspect that you have short on rectifier diode/main filter capacitor/regulator IC/transistor. This is quite fixable.
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The likely cause of this is a dead short in the power supply. I don't receal the specifics of this unit, but there should be a set of four(4) diodes or a single bridge rectifier in the main power supply area. Check this/these for a direct short using a diode checker. Other than that, the output transistors being shorted can cause hte same symptom. Without seeing the actual unit, I can not tell for sure. If you know how, check the output transistors as well. Report your results here.

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The most likely problem is a shorted diode, I suggest replacing them even if they do not test shorted while not under load. If it is not the diode rectifiers, there is probably a resister in the power supply that is shorted, remember also that it can also be both. Lastly, it can be a capacitor within the power supply.
I Wish You Well

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1 Answer

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If the fuse always blown, there is a shorted parts in the power supply section look for this short.For this symptom ,check the bridge diode there,if good ;then the regulator transistor ;then the start up capacitor.

hope this may help;
don't forget to rate;

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