Otherwise, it's likely that the output transistors failed. Some simply shut down and the power light will not illuminate when in protect mode. For those who don't know what a blown fuse looks like, the one on the left below is blown. Anyways, I've been having some trouble hooking this thing up. I was driving to dinner last night and all of a sudden my amp (DLS A4) shut off. I have a boss rev1000 1600 watt amp. I had a buddy let me barrow a working amp, and I ended up hooking that up, everything worked fine. The image below shows a terminal block that melted because the set screw wasn't tight enough on the wire (this is very common). Sub works fine when the left input cable is plugged in but as soon as I plug the right one it switches into protection mode. It takes 2 op-amps for each input. If the voltage at BOTH the B+ and remote terminals is low and your vehicle's battery is not low (check the voltage at the battery with the multimeter), touch the black lead to a known good ground (a point scraped to the metal on the floor pan of the vehicle) and the red lead to the ground terminal of the amp. I have yet to open the amp but I’m wondering if it would be a simple fix? Sounds like a short. At each connection, fuse or other point where the wire is not continuous, check the voltage. Yesterday for example, playing vinyl, amp shut off after 5 minutes. To know how low your meter reads at 0 ohms, touch the leads together for 5 seconds. worked good for 2 days and then the amp was in constant protection mode. RCA leads are used to feed the amp with input signal from the car stereo. I have 2 subs bridged into my amp, i just got a different car and they are not as loud in this car as my other car for some reason and the amp goes into protect mode when i am driving. Password: Amplifiers Discuss anything about amplifiers. So check that the RCA jacks are connected firmly into both the amp and headunit RCA sockets. Normally, both will be above 12v. If the amp goes into protect with no RCA or speaker cables connected to it or if the amplifier blows the fuse AFTER remote voltage is applied, the amplifier likely has shorted output transistors. I have two 12in. I installed a new head unit, swapped RCA cables, made sure the connections are good, made sure my voltage was good, and tried different media sources; it's still going into protect mode. If the speaker wires cause the problem then they are probably touching … I dont know what the problem is? If they are connected loosely, it can cause the amplifier to see it as a major problem, so it will purposely put itself stuck into protect mode. Other amplifiers ONLY illuminate the protect LED when there is a problem. If it's dropping below ~11v, you need to determine why. I’ll try that out, where should I connect my probe tho? One of the more confusing car stereo problems can be when an amplifier goes into protection mode. and it was a bad ground at the amp. Username: Remember Me? If everything there checks out, then you will have to … Amplifier Protection Mode Troubleshooting . Each of the 8 pin op-amp packages in the photo contains 2 op-amps. Most meters will not read to 0 ohms. December 8, 2009 at 8:57 pm Well, bad news, it does not work now. If the amp powers up after disconnecting the speaker and signal cables from it, try reconnecting the RCA cables. I have a pioneer gm-5500t I checked all the wires and connections and made sure I had a clean ground. Don't let the amp touch the screws used to moun the wood board and don't use screws so long to mount the amp that they go through the board and touch the vehicle. T. TLN1 Audiophyte. If you find that one pair of speaker wires or one speaker causes the amp to go into protect, disconnect all speakers from the other end of the wires and separate the wires so they can't touch. and what gauge is the ground wire you are running to your amp maybe it is just to dinky. But as soon as I plug in 1 RCA cable it goes into protection. Tried the disconnect/reconnect of all internal connectors. Or if its something much harder to fix. Q&A, Advice, Tips, tricks and tech welcome! Some amplifiers have a problem with broken connections between the RCA shield and the circuit board. The protect light on an amp is there to keep the amp safe when something goes wrong. If you'd like to repair it yourself, read the Amplifier Repair Primer page. Occasionally, it will go into protect for 30 seconds, kick back on for a second and hit one note, and then go right back into protect. Generally, when there is a bad connection and the connection has been bad for an extended period of time, the insulating material around the connector will be melted. Probably already assumed, but when it does go into protect mode, I can hear the transformer click off. Number1 Diamond Member. Such problems usually result from having the subwoofer positioned at a different distance from the listener than the other speakers in the system. For example, some of the Sony amplifiers have lights for power, overcurrent and thermal protection. Heads, Subs, EQs, etc... Bring it into our show room. This is common on older Alpine amplifiers. I have a 200 watt amp in my car, and everything worked fine. This is sometimes difficult to check unless you know how the input circuitry of the amplifier is designed. Solution: This can be caused by too low of an impedance from the way the speakers are wired, and sometimes a poor charging system (if the amp goes into protect when the volume is turned up). Then I disconnected the RCA cables and the amp turns on. When there is a fault, the LED changes from green to amber. If you're using a mono amp and have only one pair of speaker wires, you'll need to disconnect all but one speaker from the other end of the speaker wires. Sometimes, a VERY brief drop in voltage (too short to be seen on a standard multimeter) will cause the amp to shut down for a short while. Bad Ground? It will help you troubleshoot many amps down to the component level. Sounds like the ground at your amp and the ground at your HU are different, and when the RCA's try to equal out the voltage it throws it into protect, because the amp sees a huge voltage on the input. is a link to this site's home page. Important! The same noise it makes when you turn it on. Sometimes the voltage will only drop when current is being drawn from the power source. amp goes into protect mode when rca, If the amp goes into protect with the RCA cables plugged in, go to step 4. If the amp is OK in this torn down state start reconnecting wires until you find what causes the problem. It is a much more powerful amp than the sub, the amp is 850w rms while the sub has a tolerance of 600w I thought setting the gain all the way down would allow it to be used with it. If the amp goes into protect with the RCA cables plugged in, go to step 4. If you read something less than 1v, the transformer is likely OK. The protect mode on the amp keeps randomly kicking on. The rca cable is fine I plugged the right cable onto the left input and the sub gets power. This is especially true when the power supply has failed. I need help Then add the speaker wires one at a time. If the shield ground of the head unit is OK, the amplifier could have one of several problems. If you find that the B+ or remote voltage is low at the amplifier, you need to trace the voltage back to the source to determine where the voltage is dropping. Hey, I had my amp working for a few minutes with all the gain and everything set to low. The amp started to go into protection as i was setting the gains,i thought maybe the amp was detecting clipping that i could not hear so i decided to turn the gains down a bit. You need to power up the amplifier and measure the voltage on the shields (shiny outer metal ring) of the RCA jacks. I have the power and ground secure, and the remote wire runs off the fuse box up front. If you're using a mono amp and have only one pair of speaker wires, you'll need to disconnect all but one speaker from the other end of the speaker wires. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low. Sometimes it switches the red LED off and switches the green on (Planet Audio, Power Acoustik and similar amps). 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