Goodmans Amplifier Speakers , Humming, Capacitor wrong way still worked for a year!
Had these speakers for just over a year and they have been working fine until one day after the guarantee period they started to emit a buzzing sound on both channels , i instantly assumed that the capacitors were at fault. I opened up the device only to find one of the output capacitors connected the wrong way round. The Positive leg was connected by a fly wire aswell as to the pcb to the heatsink and the negative leg was on the positive. I tested these points with my multimeter to confirm my finding and it was indeed backwards , but i dont see how it should of worked in the first place. The voltage raised to about 41.2V peaked since it was a 50v 3300uf capacitor.. ive never had no trouble until the guarantee period ended.. i dont want to end up replacing the capacitor only to find it blows up. I dont get it its well strange, ive never known anything like this .
Hi, wow...caps of that value usually go boom real quick when fitted back to front. I too am amazed it has functioned that long. Just double check that incorrect screen printing on the board has not tricked you. Have you put your multimeter across the bottom of it to actually see constant reverse DC volts(ignoring the board markings for now). then replace the offending items, just check that the voltage they are being run at is at least 2-3 volts less than 50v rating of the cap. alot of gear runs really close these days and the supply caps fail early, we see alot of it here in Australia where our supply is 240v you see it at the socket alot of the time at 250-255v Hard on gear designed originally for 220v. I would sub the caps out with 63 volters anyway to be sure of some longevity. Good luck, I am interested to know how you go. Let me know please.
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Usually this is because the base driver in your speaker is shot. I have repaired hundreds of amplifiers and have never found just the BASS being low at the output of the amp. If the amp is working, then the likelyhood of the speaker being defective is good. A quick test is to just swap speakers and see if the problem moves to the other channel.
If you have a very old transistorized amplifier, you may have a large value coupling capacitor between the actual amplifier circuitry and the speaker output. This is because the older amps had a large DC voltage at the output of the amplifier and this had to be removed or the speaker would be damaged. This capacitor may have finally given up the ghost and needs replacing. While you are at it, you may as well replace both as the other is soon to go.
My bet is that the woofer in the speaker cabinet has blown.
Sounds like a Electrolytic capacitor has failed. Search backwards from the speaker connections inside the unit to the main PC board. Replace the first ones that you come accross that are linked with the speakers.
Unplug speakers. Try headphones - are they working? Are speakers correct impedance? If it says 8-OHMs output, are you using 2-OHM or 4-OHM speakers, if so, not good. Sound like wrong impedance speakers or a short in the speaker wiring/connector.
You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.
If it is working fine and then shuts off and gets hot in just a matter
of seconds then you are in the process of frying your amp.
Disconnect all speakers and recheck your speaker load. Try only
one speaker on one channel and then one on the other channel at
first. Or better still, while you have all the speakers removed,
try listening on headphones and see what happens. It sounds like
you have seriously overloaded your output transistors with the wrong
speaker configuration. Good luck.
your wall speakers may not be connected.... disconnect each speaker from the selector box and test with a small AAA battery to see if they are connected by putting the battery between each speaker's wires , you will hear it crackle ,then gradually connect each wall speaker onto the speaker connector box . If the first set does not work i suggest there may be a problem with your speaker selector box . Good luck
This is usually caused by a blown fuse or a blown capacitor. The fuse would be cheap and easy to fix, the capacitor would be expensive and replacement would be my choice. If you are pretty handy with electronics, unplug it, take the cover off the unit, and look near the capacitor for the fuse. Check the fuse for a break in the wire inside it. You can get these fuses at Radio Shack. Hopefully this is what it is, and will be a cheap and easy fix for you.
Let me know how it goes.