Re: amp wont turn on, but i hear a pop when turning off
If you can, look at the PC board, usually this indicates a blown amplifier chip, transistor or FET. The poping sounds can be the transistor base feedback, because of the RC filtering and amplification. You can sometimes see brown, or lifted clad on the board, if not always lick your finger and touch the top of an amp chip. I say lick your finger because if it is shorted, it is going to be hot!!!!! When you lick you finger, you will hear the sizzle before you burn your finger, just be careful not to touch the high voltage.
Re: amp wont turn on, but i hear a pop when turning off
First off nothing should pop when turned off next it could be a grounding problem external or internal or worse an audio output problem take a volt meeter and turn key to on check the ground and positive on the amp should read 12 to 14 volts do same with ground and remote wire if these both read correct remove the back set your meeter to the diode setting the audio outputs are usually the larger ones but sometimes not take your leads and touch out side legs then to the outside to center try each one every way you can switching leads if at any time the buzzer stays on or goes to flat 0 then that output is bad if all check good i would go through the car making better connections and cleaning up any wires that might seem to be faulty maybe even replace your RCA cables im running 18 speakers and 8 amplifiers in my car and i have done this several times :( but i don't pop unless something is wrong hope this helps
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your either overloading something cause that's what pops fuses. My guess is that what your plugging in or into has a ground issue. I'm wondering if it does it with nothing plugged in at all. I would say if you have nothing in and it does it, you need to find where the ground issue is. that's my best guess
Check your cables - I've had similar problems with various amps playing various guitars; the guitar electronics and the amp electronics are fine, but the cable is damaged internally and this causes the same problems as you have described. Have you tried using a different cable? Buy a different one, try it out, and see if you have the same problem. If you have a friend who plays, let them plug their cable and guitar in the amp - if it works, your faulty cable is the issue. Hope that helps!
If it is new then something is a bit strange to say the least. Turn all the knobs to midpoint. If it is going to click/pop then you will definitely hear it. Switch to standby, then power to on for a minute then standby to on. You should then see the 6l6 and the 3x 12AX7's all glowing. Plug into each channel. Don;t use a pedal to try any of this. If you get a pop on on ch then it can be one side of the preamp either a tube or one of the op amps on the board.
Make sure you try out the cable/guitar on a different amp to make sure it is working. Could be a cable or plug that is the problem.
Honestly if this is new I'd haul it back to the store and return it. It should just work with no hassles. Once you know your guitar/cable is not the cause then I would take it back and get them to either set it up or replace it. Something is just not right here for a brand new amp.
All amps make a small amount of noise (system hiss) but the amps own power supply should not cause a problem on it's own.
However if the frequency is around 50hz (the G 2 1/2 octaves below middle C on a piano) it is most likely due mains electricity interference or an earth (grounding) issue.
Here are a few things to try to identify the source.
Could be a lack of earth (grounding) This is potentially VERY DANGEROUS and could result in electric shock if you touch a metal part of the amp or touch some other metal object (like a microphone stand at the same time as your guitar strings). Check the earth wire is firmly attached at both ends of the power supply lead.
Could be a defective mains socket - try plugging it in to a different one, preferably on a totally separate circuit.
Could be an earth loop. These can occur if you are using the amp with an output to a public address system or mixer that is also earthed because of a 'potential difference' between the two earths. Solution - use the balanced (xlr) output which incorporates an earth lift rather than the unbalanced jack output.
Unplug any effects pedals, foot-switch etcetera to see if that eliminates the problem. Turn off any internal effects, including bass intensifier.
Make sure any signal cables (guitar leads) have good quality screening and that the screen is well soldered to the jack plugs at both ends.
Ensure signal leads do not lay along side (parallel) close to mains electricity cables but are well separated and only cross at right angles.
Move the amp away form other electrical equipment that may have a powerful magnetic field (especially CD or DVD players, hearing loop amplifiers, radio microphone transmitters / receivers, mobile phones
Turn around or stand in a different position - it might simply be the pick-ups in your guitar causing interference in the magnetic field of the power supply.
Does plugging in or unplugging a signal lead / guitar make any difference? This particular amp requires only mono jack plugs a stereo (trs) plug may be shorting across terminals
Does it change when you touch the strings with your hand? If yes check internal wiring and screening within the guitar.
Wonder no more, there are many others with many different brand of amps that do this. Obviously it needs repair unlless you have a problem with the cable or source you are using or have forgot to turn up the gain controls which I am sure you have checked. There are so many possibilities that there is no way we can say open it and replace this... If you get a small pop in the speaker when you turn it off, then the power portion of the amp is probably OK. A common probllem on amps that have a preamp out or power amp input jacks is a failure of the switch contacts on the crummy jacks that pass the audio through from teh preamp to the power amp...
The unit will require repair and if you are not adept at electronics, you will need to take it to a shop. Likely there is failure in the power supply or amplifier that has blown the fuse. Replacing the fuse WITHOUT repairing the cause MAY do additional damage.
I would try hitting the side of the amp before turning it on. There may be a loose piece of solder or other conductive particle stuck somewhere. Bang the cabinet rather hard with your fist. If that doesn't help it might be a loose solder connection at a resistor or capacitor but a tech should check that out.
I have answered some of this before, however I have reveiwed the schematic and as an electrical engineer I want you to do a couple tests.
First, plug in a set of headphones into the preamp out jack. Note that due to the impedance mismatch what you hear will not be very loud. Now change the state of the clean OD. Did you hear a faint pop?
Next plug a LOW impedance device OR even an instrument cable into the power amp "input" jack. Do this with the power off then warm amp up.
Now, change the state of the clean OD. Did you hear a faint pop?
Now for the analysis. If you did hear one in the first test and NOT in the second, the pop you are hearing is the "NATURE OF THE BEAST".
I can tell you from the design that the pop you hear is from coupling within the clean and OD relays within the unit. There is no cure for this within the unit other than find another brand...
I would recommend that you use an EXTERNAL pedal for the effects you want rather than trying to use the clean OD in this amp. I suspect it was never intended to be shifted during playing as I can guarantee it will pop when you shift while having anything other than dead silence (not even a bit of hum from your guitar). There is also statistical noise in the preamp that the laws of physics will not let us get around that may be enough to create a bit of a pop.
You could also use a volume pedal between the preamp output and the power amp in to throttle the volume to zero before shifting to OD.
In general I think you will find that what you are hearing is the nature of this beast.