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Stereo power amplifier outputs were shorted and circuit smoked I heard a sizzle noise under the amp and a little smoke and smell emanated from beneath. What blew and what does it take to fix it? Mitsubishi DA M 10 Stereo Power Amp ( approximately 20 years or more old.)

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Hi,

Most probably output devices have burnt out,

It would be a lot better if you can identify or have an image if you cant,

or send a link where i can see the image of the bad part.

Many possibilities but a visual or image may possibly identify which is

or are?





Posted on Dec 09, 2009

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MY 1993 CLUB CAR GOLF CART WILL NOT MOVE, I HEARD A LOUD POP WHEN I WENT FROM FORWARD TO REVERSE/ANY SUGGESTIONS?


check to see if there is a circuit breaker on the wire path from your batteries. Could have blown the motor but You would see some smoke more than likely, and smell it burning. What you described with the popping sounds like an electrical short where the wires just burned up but again you'd smell it and maybe see smoke. The switch may be bad also check it with a meter to see it its making contact and see if voltage is coming up to and exiting the switch.

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Washer had just started and i started to smell something, and all of a sudden a noise came from the washer and then smoke came from machine really bad, the noise sounded like air escaping


Looks like something is short circuited & due to which there is burning smell coming out of the machine. Disconnect the machine immediately & inspect the insides of the machine. Locate the burnt motor or burnt wires. You heard the noise coming out of the motor. It could be dislocated brushes due to which the motor could not rotate & in turn it burnt your motor.

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I recently revisited my car after a few weeks out of my hands, and seconds after turning the key and the unit powering up, the sound of popping and shrapnel in the amp was heard and the smell of smoke...


What has probably happened is a short somewhere in the amplifier. Here are some possible scenarios:

1. When the new capacitors were installed, make sure that no solder shorted any pads on the circuit board to anywhere else.

2. There is probably a resistor upstream of the capacitors that has shorted but still appears to be fine. Look at the circuit board & follow the traces that connect to the 2 terminals of each capacitor and follow them to other components. Examine them very carefully. Pull on the wire terminals of upstream & downstream components to ensure they are solid. Check each side of the component with an ohm meter. If a zero resistance is given, or no (open) resistance is given the component could be in question. To properly check it out, one side of the resistor must be pulled up from the board, then check the resistance again. If out of spec, it would need replaced & then it would properly voltage limit the capacitors, keeping them from going up in smoke.

3. This can be a very tricky problem without a schematic. See if you can get your hands on one, it makes circuit tracing much much easier

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Well it seems to me that the pictures of this amp show green ATC fuses which would be 30 amp fuses. What is your inline fuse from the battery? 40 amp fuses for the amp is too much current for the amps powersupply. If there was a short in the powersupply the max ammount of current that it could draw would be larger than designed to handle therefore damaging the amp.

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you have blown the actual filters that make the sound. a amp is basically a filter with the same filters on both channels on each side of the inside of the amp - channel 1 and channel 2, that pop was in the heat sinks of the amp usually. if you have replaced the fuse in this amp and you get no on light, the internal amp is in need of repair

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My Cobra 29 ltd classic


Hello MyPete,

You have some form of short circuit in your CB, most likley I would suspect the Power supply or the RF Power Output Amplifier. Here are some basic instruction on how to tell wher the smoke is coming from.

1) disconnect and remove your CB from your vehicle and put it on a workbench
2) remove the cover from your CB and expose the circuit board to view
3) connect your CB to an external 12 volt power source and antenna or a dummy load
4) power up the CB and determine where the smoke is coming from then turn off the power supply to the CB
5) At this point you will need a schematic of your CB (get one from www.servicemanuals.com)
6) find the point on the schematic that relates to the point where the smoke is coming from
7) using a ohmmeter determine which component and or components are shorted
8) replace the shorted and or malfunctioning components.
9) test the system (power on, transmit and receive)
10) close the unit back up
11) reinstall into vehicle
12) run tests again.


This should help

Thank you
Shutle832

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AudioBahn A2300HCT no sound


Generally, if the amplifier smokes, the power supply FETs have failed.

Many times, the output transistors fail and that causes the power supply FETs to fail.

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If you know how to check the transistors, check them to determine the severity of the damage. If you don't know how to check them, read through the following page following all links provided.

Basic Amplifier Repair

Let me know if you have any other questions.

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Hi, probably worth fixing, Crown gear is generally reliable, but this one has failed for some reason. Puffs of smoke are not generally good... If it has blown an output array, expect a costly repair.

regards
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Shorted out amp!


sound like you could have shorted out your audio o/p transistors. if you take the amp apart you should find 1 row on each side of the amp, one side is power & the other is usually for your sound out. the transistors on the audio side out could be bad, look closly to see if they are bubbled,cracked or just dont looke in as good shap like the others. these audio transistors work in pairs, so replace them in pars even if only 1 is bad. if they all look ok, test them with a multi meter to see if they are shorted. good luck.

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