04-05-2008 #1 spikey007. audiobahns with a 1600 watt soundstorm amp and a 4 farad cap. In this particular amp, the damage was so bad that the block melted the solder and pulled out of the board. The resistance across fuses rated more than a few amps will be essentially 0 ohms. 2. 3. You first need to check the RCA shields of the head unit. Above, I purposely recommend placing the black probe of the meter on the ground terminal of the amp. im only asking cause i have sean some people that have run speaker wire as there ground. 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. For those who don't know what a blown fuse looks like, the one on the left below is blown. 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. and it was a bad ground at the amp. power my subs will make popping noises and the amp goes into protect. Amp going into protection mode only when right rca is plugged in. If you read 10v or more, the amplifier may have a shorted transformer. I’ll try that out, where should I connect my probe tho? If your unit goes into protection mode, it is a good and bad thing- good that further damage is being prevented, but bad in that it may delay the gig. The protect mode on the amp keeps randomly kicking on. To know how low your meter reads at 0 ohms, touch the leads together for 5 seconds. Amp goes into protect mode when i hook up RCAs . Also, the amp DOES NOT stay powered on when the RCAs are unplugged. Problem: Amplifier goes into protect. T. TLN1 Audiophyte. One of the more confusing car stereo problems can be when an amplifier goes into protection mode. amp going into protect mode - hey all, problem just occured today. Or if its something much harder to fix. 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. The lights are always lit when the amp powers up but are normally green. Many amplifiers show protect when initially powered up (mute delay) and then switch to green. 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 powers up after disconnecting the speaker and signal cables from it, try reconnecting the RCA cables. 26,876 satisfied customers. Now it wont work and keeps turning on and going to protection mode. March 18, 2013 at 7:58 am I had the same “protect” problem with a Sony STR-AV1070 I was ready to take a hammer to. Recently, when I attempt to switch my Insignia NS-R2001 Stereo Receiver out of standy by mode after turning it on (it is automatically in standby when you turn it on), it switches back to standby mode after a few seconds. It's important that you leave your head unit on during testing so that the remote line will have voltage on it, the amplifier will be on, and the amplifier will be drawing current. When I only connect the right speaker to the receiver, I can play at high volumes without the receiver going in protection mode. This happens when the voltage drops too low when the amp is being driven hard with an insufficient power supply. If the car is on but the engine is off they will work, but even then if i try to turn the amp up any from min. At each connection, fuse or other point where the wire is not continuous, check the voltage. 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). For example, some of the Sony amplifiers have lights for power, overcurrent and thermal protection. For those amplifiers this is normal. My fuse running from the battery power wire blew today so I had it replaced. I've checked all the connections and everything is wired right and tight. 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. I removed the speaker wire to see if its the speakers and its not the light still shows red. This is sometimes difficult to check unless you know how the input circuitry of the amplifier is designed. Changing the wiring between the speakers still keeps the same problem. 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. Once I had a chance to check, I found that the amp was going into protect mode. I have a head unit and a 5 channel amp running 2x 6.5" speakers, 2x 6x9" speakers and a 12" sub. If you read something less than 1v, the transformer is likely OK. Phase Shift: Use this button to help compensate for time alignment problems. ElectronicsPete. Touch the black meter probe to the ground terminal of the amp and the red meter probe to each of the RCA shields. Sucks… John Regalbuto. 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. Amplifier Protection Mode Troubleshooting . I took all the speakers off and the amp worked, it didnt go into protection mode. It will help you troubleshoot many amps down to the component level. 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