Question about MA Audio HK4000D Car Audio Amplifier

1 Answer

Same way its connected the same way it was before i took out the other amp how do i test the cap to find out if its defective or not

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 631 Answers

If the cap is connected as it was before, disconnect the amp from the power source and replace the fuse. If the cap gets hot and is connected properly, it's defective.

If it only gets hot when the amp is connected, the amp may be creating excessive ripple on the B+ line (which can make a capacitor run hot).

Posted on Aug 16, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Power cap has power amp protect light is on ?

If there is a protection light then you have a bad power or ground connection. First thing I recommend you do is to get a regular test light with a ground alligator clip and test for a ground on your power cable. The way to do this is to place the alligator clip to either your amp turn on wire which is the small blue wire coming from your radio to turn the amp on or another powered wire and place the tip of the test light to the main power cable that powers the amp or the Capacitor and if your test light lights up then you have to trace the power cable from amp back to battery + terminal and see where the power cable is pinched or making a ground contact also check your blue amp turn on wire and see if it has a ground to it. If all this checks out then check your cars battery terminals, make sure they are not loose, corroded, rusty or damaged check fuses or take out amps fuses and reinsert to see if it resets, check all ground connections on amp and cap,if none of this works for you then you might have a defective cap or amp.

Good luck.

Jun 19, 2010 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

When I turn the car on the amp goes into protect mode

A few things can be happening, the amp has a short somewhere, the amp is defective, or it may have a connection problem, wires connected the wrong way, but it is most likely a short somewhere, trace the power wire from the battery to the amp 12V+ connector and see if there is a short or if the wire is pinched, another way to find out is to get a test light, find a power source somehwere ( 12V+ ) and place the test light tip on the amps 12V+ connecter, thats the easier way if you are too lazy to trace,lol. If the test light lights up then you have the power wire grounded and you need to find out where and correct it., Also check the amp turn on wire it may be grounded or shorted as well. If this your solution please remember to vote and rate me.

Good luck my friend.


May 21, 2010 | Insignia 600W Bridgeable Amplifier with...

1 Answer

I have a mtx thunder 1501d..i have the power cord connected from the battery, to a power cap and then to the amp...i have the ground connected to the metal frame of the car, to a power cap and then to the...

Hello tonytone54, The ground should go directly to the vehicle frame, never through a cap, fuse, or anything else. Also, if you are connecting positive through a cap, make sure that you charge the cap before connecting it. Hope this helps.

Jun 03, 2009 | MTX Thunder 1501D Car Audio Amplifier

1 Answer

My Kenwood KAC-929 gets power but DOES NOT put any sound out. Whats My Possible problem(s).

Hello Spicer_kyle6,

Possible problems: 1) No output from the head unit. Try a different set of preamp outs. 2) No input to the amp. Check the RCA's and make sure that they are good and coming from a functioning preamp or subwoofer output on the head unit. 3) Input gain turned off or down too low. 4) Speaker wiring shorted, grounded, or open. Check all wires. 5) Speakers defective. Connect to a known good output to test. 6) The amp itself could be defective and still show a power-on indication.

Hope this helps.

Apr 28, 2009 | Kenwood KAC-929 Car Audio Amplifier

2 Answers

Amp keeps blowin the two 30amp fuses on the amp.

Make sure that the speaker wires are wired correct at both the amp and the speakers......otherwise it sounds like the typical death of a power acoustik amp (great amps, but prone to a premature death)

Mar 29, 2009 | Power Acoustik GOTHIC OV2-1200 Car Audio...

1 Answer


Since I do not have the amp opened up on the test bench and connected to be able to take readings, I can only speculate.

It is obvious by your description that the amp is going in to protection mode. It is possible that the total impedance is too low, or that the amp is being over driven.

If there is some distortion occuring especialy at a high level, the amp should go in to protection mode. It is also possible to have some defective components that are making the amp too sensitive to go in to protection mode. I have also seen defective components intermaly in amplifier units that have caused the power supply to go in to the protect mode.

I have seen defective crossovers in speaker units also cause an amplifier to go in to protection, or even be damaged. If the crossover has the type of defect that is causing an impedance missmatch or be in a low resistance, this can cause the amplifier to go in to protection.

You will need an experienced tech who knows the model of amp very well, has the instruments, and has the service mauals in order to be able to go through it to find the exact fault.

Considering the circumstances, this is the best I can do for you.

Jerry G.

Jun 11, 2008 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Component speaker not working

The easiest thing to test is to try swapping the connections of the front component speakers at the amp connections. If the problem follows the speakers, the issue is probably with the speakers. I would triple check (again) the speaker wire connections. It's also possible the crossover for the driver side component speakers has an issue (thus why the tweeter worked for a while).

If the problem stays on the drivers side, the issue is probably with that channel on the amp. Triple check the RCA connections for that channel.

It's much easier to test other speakers on an amp channel versus trying to check it with a meter.

If the driver's door is "abused" often, my initial thought is the wiring at the speaker or the wiring in the speaker (to voice coil, within the crossover, etc) is the most likely culprit.

Apr 10, 2008 | Infinity 475A Car Audio Amplifier

2 Answers

Amplifier repair

Unknown model not working could be a bunch of things!
does the unit have power?? fuse(s) ok?? turn on voltage present(12v)?? Any leds?? Unit ever get wet?? Any lites?? smoke get out?? was it, did it get real hot??
I have worked on a few with various problems, no common problems. Some of the things I have seen; Level adj pot was smashed in, Shorted fets , + burnt gate drive resistors in the ps section + blown runs, bad connections, shorted outputs, corrosion from beer leakage, bad electrolytic caps, leaking caps ate up the copper runs, metal bars used to hold down fets and outputs came loose, parts over heated and shorted.
Open up and look around, burnt resistors, leaking caps, puffed up caps, black marks, are all helpful signs.
These amps typically use FETs in the power supply(+/- 25-50v) and regular transistors for the outputs. Test all heatsinked parts for shorts. Carefully remove metal bars holding down heatsinked parts, keep track of where the heat sink insulators go, remove pcb and inspect runs. Repair and bench test with a power supply that has an amp meter. With out any input, unit should only use a few amps after initial 5-15amps to get the PS fired up. Then test across speaker outputs for any DC voltage. Anything over 1v, (should be very close to zero) amp needs some more work.
Good luck!

Nov 06, 2007 | Orion 8004 Car Audio Amplifier

1 Answer

Amp Trouble

Actually, it's more likely that the problem is on the outside of the amplifier than the inside. Your problem may be caused by a ground wire that's come loose from the grounding point, a defective fuse or corroded connection on the power wire, an overload of the remote input wire, or a problem with the head unit that your amp is connected to. The easiest way to troubleshoot is with a voltmeter. Test the voltage at the amplifier's main power terminal and remote terminal while the meter's black probe is connected to the ground terminal. If you find voltage dropping on one of the terminals, you can focus your attention on that wire.

Mar 09, 2007 | Kenwood KAC-7202 Car Audio Amplifier

Not finding what you are looking for?
MA Audio HK4000D Car Audio Amplifier Logo

Related Topics:

51 people viewed this question

Ask a Question

Usually answered in minutes!

Top MA Audio Car Audio & Video Experts

Robert Rankin

Level 2 Expert

338 Answers

Ronald Prier

Level 1 Expert

26 Answers

sonic boom...
sonic boom...

Level 3 Expert

1557 Answers

Are you a MA Audio Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides