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Crate ca60 musical amp..loud bzzzz upon power-up

Fuse looks good...speakers may have gotten wet...no obvious burns or breaks on circuit boards...1990`s vintage...direct short in pwr supply? buzzes loudly..as if no ground anywhere.

Posted by johnnyops on

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5 Related Answers

soundproman7

  • 29 Answers

SOURCE: Nothing but loud buzzing coming over the amp.

If the buzz disappears when you unplug the cable from the amp. check your cable.
If the buzz disappears when you unplug the cable from the instrument, there's something thay may have come loose inside the instrument.
If you unplug the cable from the amp., and the buzz persists, you'll have to have a competent tech. check your amp.

Posted on May 20, 2009

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Anonymous

  • 7 Answers

SOURCE: bass amp blowing fuses

Hi

Go to www.ezrepair.ca and send it to us.
We will diagnose your unit for free and give you an estimate in a 48H maximum period.

Posted on Jun 28, 2009

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Anonymous

  • 157 Answers

SOURCE: looking for a circuit board manual or diagram for

try the Crate Website
http://www.crateamps.com/support/discontinued.phprate

Posted on Aug 20, 2009

RixsFixes

Radio Code Pro

  • 2200 Answers

SOURCE: I have a crate PA 8 and it makes a crackling noise

Hi

The problem is with the amplifier itself. Crackling is usually capacitor related and you will need to have the amp checked over to properly identify the cause.

Some amps are also prone to pick up static from other electrical items which can also cause these problems. I had a crackling issue with an old Crate amp of mine which turned out it was due to being too near a computer/monitor so it is worth eliminating these things as a possible cause before having the amp checked.

Hope this helps. Thanks for using FixYa.

Posted on Oct 28, 2009

Fred Yearian

  • 5603 Answers

SOURCE: crate pa6fx powered mixer, powers on but when I

It is likely that there is a failure of one of the amps in the unit. It could be a cracked circuit board, bad solder, bad volume control, or a bad compnent in the power amp section for one side. HOWEVER something does NOT compute here as you can't connect more than one speaker to a 15 Watt Crate amp... Maybe you have two of these amps.

Posted on Dec 29, 2010

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2 Answers

What causes buzzing in speakers?


There are many causes of buzz, so it should be checked step by step :
- Bad connection on the input connector, or cord.
- Amplifier, basically have the block diagram like this:
25850676-l1qpqmriditabltrjczr2eku-5-0.jpg If in one block damage, buzz can be heard.In the amplifier.
Generally occurs in the PSU and / or power amplifiers.
Fix it to the experts,because it requires a good knowledge of electronics.
Blown speaker cone, does not cause a buzz.
Short circuit along the wires supplying the audio, it will not cause any sound in the speakers, including the sound of music.
Try also, disconnect the input connector, whether the buzz is still audible. If after the input connector is removed, the buzz disappears, the possibility of buzz came from another device before the amplifier.

Sep 05, 2015 | Behringer Xenyx 1202fx Mixer 12 Input 2...

3 Answers

What would cause a buzz in speakers?


There are many causes of buzz, so it should be checked step by step :
- Bad connection on the input connector, or cord.
- Amplifier, basically have the block diagram like this. View image.25850665-l1qpqmriditabltrjczr2eku-2-0.jpg
If in one block damage, buzz can be heard.In the amplifier.
Generally occurs in the PSU and / or power amplifiers.
Fix it to the experts,because it requires a good knowledge of electronics.
Blown speaker cone, does not cause a buzz.
Short circuit along the wires supplying the audio, it will not cause any sound in the speakers, including the sound of music.
Try also, disconnect the input connector, whether the buzz is still audible. If after the input connector is removed, the buzz disappears, the possibility of buzz came from another device before the amplifier.

Sep 05, 2015 | Behringer Xenyx 1202 12-input 2-bus Mixer...

1 Answer

Model Yamaha ME-50 no power


John
With AC power off.
Use a meter (on Ohms scale) to check internal fuse for blown (open) fuse.
If you feel qualified & safe with AC Power On.
Check input to internal power supply on AC Scale (Caution when AC is on) for volts in.
Use meter on internal Power Supply for "probably" DC volts leaving internal Power Supply electronics to power the rest of the electronic circuits.
Switch mode power supplies can break down. They stop doing their high frequency switching so they don't convert AC to DC.
If this P/Sup is a separate box or circuit board, inside the unit, then it can have a part number & be replaced.
Good Luck

Jul 14, 2014 | Yamaha Music

2 Answers

I have a Pmp5000 889406987784 Eurowpower PMP5000 1200-Watt 20-Channel Mixer and Speaker Output A has no output. What has happened?


Usual problem is the Channel A amplifier has burned and blown the switching transistors. Usually an internal board arc occurs and unless very skilled at board work of clearing the burned area and replacing the components you are better to replace the HCA2400 amplifier module... about $160

Sep 19, 2010 | Behringer Europower Pmp5000 Powered Mixer...

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I have the Line 6 Spider 3 15 watt. My friend accidentally plugged it into a 220v power source and blew the fuse. We replaced the fuse and plugged it into a 110 outlet. When we did it made a pop sound and...


Hey I have the same problem on the one i just bought for 10 bucks, I was wondering if you could tell what the pink tube thing and the white tube things near the semiconductor that was screwed to the metal are? are they capacitors or what? please help.

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1 Answer

I have an Epiphone Blues Custom 30 amp. I have had it about 2 months - purchased used. I have probably played it about 10 hours total. This morning, I turned it on and it played for about one minute then...


There may be an internal fuse, but the unit will need to be serviced by an electronics shop.

If no odor or burning smell happened, then I suspect a bad solder joint or cracked circuit board. Look the board over with a very bright light.

LOOK for a dark circle around pins of HEAVEY components in the solder menicus for all the pins of the heavy components.

Look for board cracks with a small LED flashlight shined through the board.

Feb 28, 2010 | Epiphone Music

1 Answer

Pmp3000 problem power supply.ic circuit problem.number series ic circiut..


I have a PMP5000 that I had to resurect. I had to trace out the power supply to repair it.

I can give you hint: First, a small supply runs directely from the line and generates some of the small voltages. While this starts, the main power caps are charged through limiting resistors. The main switcher is brought online and if the power amps acheive balance, then a relay connects the speakers and shorts the limiting resistors.

This is what is in the 5000 and I suspect the 3000 is similar.

In my 5000, there was arcing at one side of the power amps. The board was burned and three power fets fried. Cancer of burned board had to be carved out and traces replaced by hardwiring.
In addition, the limiting resistors were blown open, both main switching transistors were blown and 4 small driver transistors (surface mounted) and several diodes AND a switching regulator chip (surface mounted).all fried/

Hint: When restarting the unit, put a 150 watt light in series with one of side of the power input to limit the current in case you did not get all the dead bodies out.

This is a class "D" amp which drives PCM waves into a filter which is then the audio output. It is much more efficient thaan a linear amp.

Dec 24, 2009 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

My BOSS Distortion(DS-1) pedal buzzes whenever the distortion is up. I've changed the battery, outlet, and amp, but it continues to sound. I tried a different pedal, and it worked fine. How can I stop it...


This sounds like a broken ground wire or trace within the unit if an IDENTICAL pedal does not act the same AT THE SAME SETTINGS.

Sometimes a circuit trace gets broken on the board inside pedals and can cause this.

Since an identical pedal doesn't have the problem, service is required.

If you know electronics you can open the pedal and look for obvious problems.

HINT: Use a bright LED penlight to "candle" the circuit board to look for cracks.

Look for broken solder joints... this can take an experienced eye to spot.

A distortion pedal NORMALLY is very simple circuitry.

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1 Answer

Vlz 16 blowing fuses


This is a serious problem. If you spilled liquid into the unit, expect serious internal damage.

DO NOT keep replacing fuses as you may be creating further damage.

Best scenario is if the input to the power supply has shorted diodes or capacitors. Worst is that part of the circuit board has been burned.

Taking it to a shop or having electronic skills and opening the unit up to troubleshoot are the options.

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1 Answer

I have a set of peavey scorpion sp5xt's one works fine but if i plug into the other one ,in full range, only the horn works,


Horn and speaker combo cabinets have an electronic component called a "crossover". The horn and speaker both work off different electrical signal frequencies. If you can take off the back, or get inside by pulling the speaker, check for a small circuit board mounted inside the box or on the speaker or horn. Check for a broken wire or loose connection of the crimp connectors.

A common problem with speakers, often the cone, or paper part of the speaker will come un-glued or separated from the magnet "voice coil". This happens when played too loud, when it's commected to the wrong impedance, or if the signal was shorted and "overdriven" (usually sounds like an awful buzz that's really loud).

Always make sure your output impedance matches the impedance of the speaker. Most auto stereos are 4 Ohms. Older home stereos are typically 8 Ohms. Musical PA gear varies between 4, 8, and 16 Ohms. Peavey gear is typicall 4 Ohms, but some older models are different. The Ohm rating is the amount of the resistance in the circuit. If your speaker is 4 Ohms and you plug it into an 8 Ohm circuit, you can destroy the speaker and sometimes the crossover circuit board.

Good Luck.

Jim
[email protected]
Phoenix, Az

Jan 09, 2009 | Music

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