How can an Amp sound awsome but need $75 in repairs

[dB-r 10+ year member]

he wants your $75 //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
thats is all

Actually I'd rather not work on it. But if it ends up here it's gonna be $75 to replace those little transistors.

 

[patrick1202 10+ year member]

it is the hu

 

[dB-r 10+ year member]

The relay circuit in the amp has a delay, this is how it goes:

HU puts out 12V+ to the remote wire

Amp starts up power supply

Amp starts up the drive signal to the outputs (class D only)

Drive signal syncs all outputs to oscillate at switching frequency

Relay connects outputs to speaker terminal

The problem is likely not the HU. The delay is at least 2 or 3 seconds, possibly 5-6 secs after the head unit has turned on the power to the remote wire. I could be wrong about this, it could be a dozen different reasons why it pops, but I think the amp is most likely the culprit. Unhook the RCA's and then fire up the amp, leave the remote wire connected to the head unit, but with the RCA's unplugged from the amp, if you still get the pop, it's the amp. Might try it a couple times in case those transistors are intermittently working, which sometimes they are intermittent.

 

[jco1385 5,000+ posts]

Actually I'd rather not work on it. But if it ends up here it's gonna be $75 to replace those little transistors.

i thought someone bought an amp, said it works fine and then was wanting $75 back for "repairs".

oops

 

[dB-r 10+ year member]

It will play fine, even if those little transistors are bad, just not full power, and it will pop when you turn it on, possibly off too.

 

[AudioFreak 10+ year member]

Ask the buyer if he has a Pioneer HU and try disconnecting the RCAs when powering up/down to see if it goes away. If he removes the RCAs and it goes away he blew the little micro fuse for the RCA ground output, this can be blown by a fart or hotswapping RCAs ! Don't ask me how I found this out... //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Polo..

yep i got a pioneer hu.i took the amp out for right now untill i fix it but i quess i could try hooking it back up and do what you are talking about but i already have another amp that works fine on that hu.

 

[Safe_Cracker 10+ year member]

Actually you don't need a HU, just jump a wire from the +B to the remote, without touching the ground, let it turn on. If it pops when powering up/down then you know it isn't the HU. POlo..

 

[Korn4Life 5,000+ posts]

How about this. The amp never made any popping noises when It left my car. Unless it magicaly happened during shipment.

 

[yunvme666 10+ year member]

hey db-r, i never had a pop in my car till the z1 which dave never had a pop and hollisterguy doesnt now either, just in mine, and i tried a bunch of things only thing i got to stop it was turning it off above 14v..... which could be his problem too, i found i had some bad wires in my main harness which i traced down and fixed basicall the headunit never was gettin a full 14.4 with car on ..... but ill never know if that fixed the z1s prob seeing i moved on......

sorry for the ot korn.....

 

[king ranch 5,000+ posts]

one of my kicker amps used to do that checked the ground and sanded it down and made a better connection problem fixed