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Check the speaker in you car which are connected to you head unit. if the speaker or the wire which runs to the speakers have some problem then the head unit will show protect.
Also one more possibility is, the faulty output amplifier IC in the head unit. if the audio out put IC is short or fail then also the unit will show the same. Audio output Ic means the audio amplifier. Check the speaker and wire first. Mainly the wire check is there is any insulation damage in it. if the insulation get damagedpossibility to get contact with the metal part of the body of the car then also the protect will appear.
Usually when a receiver goes into protect mode, there are several reasons, One is there is a bad speaker connected to the unit, this will cause the unit to to into protect mode, try disconnecting all speaker from the unit and turning it on if it does not go into protect then one of the speakers are bad. Another reason is the power output Amplifier IC is shorted inside the unit. Another reasons could be that speaker wires are touching each other and causing a short. Disconnect all unit connecting to the unit and try turning on, if it stays on and no protect then connect them including the speakers one at time until you determine which is causing the error. If it goes into protect with nothing but the unit on then the Output IC is bad and the unit needs servicing.
The receiver has an output load problem, turn the unit off, remove the speakers and wires, now! turn it back on and reduce the volume right down, if the word protect stays off you have a short in the wires or one of the speakers. However! if the word protect comes back on "with the wires and speakers dis-connected" there is a short in one or more of the audio output ic's in the receiver, this will require a technician to troubleshoot the extent of damage and cost involved.
It sounds like the unit is going into a 'Protect' mode, if this is the case, it is detecting a short circuit on the Output stage. The first thing you should do is disconnect all the speaker wires whilst the unit is un-plugged and then re-test, if it then starts up ok there must either be a problem with one of the speakers or the speaker wires were short circuit down the the casing of the unit, i.e frayed wires of one of the positive cables touching the casing. If the unit still goes into protect then it is posible the output device inside the amplifier has been damaged in which case it will need to be serviced.
you have a shorted speaker wire, bad speaker or a bad output ic inside the unit. check the speaker wires and speakers for possible shorts. if possible you may want to disconnect the speaker wires and see if it still goes into protect. if it goes into protect with no speakers attached you have a bad output ic.
Audio receivers have an output protection circuit called "protect mode", this is to protect the receiver from short circuit failures.The speakers and speaker wires are what I inspect thoroughly first, look for bare speaker wires,or bare wires that are touching each other at that point,check speaker wires at the back of the receiver for sloppy connections,etc.If all looks good then try disconnecting all the speakers at the receiver,then turn power on to see if it goes into "protect mode", if it does the the receiver probably has an internal short and will need to be sent in for service,if it doesn't go into "protect mode" then connect one speaker at a time back into the receiver until it does go into "protect mode" then which ever speaker you connected last is the speaker that is shorted(blown) and then you know that speaker is the problem and it will need to be replaced or repaired. Good luck !
First check for fluid on the PCB's, if ok check the following:
This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input/device and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. SELF- DIAGNOSIS INDICATE X-RAY. CHECK FOR A SHORTED IC5A03 PART # 270P704010 AND AN OPEN R5A73 82K ¼ WATT OFF PIN 2 OF IC5A02 ON THE MAIN PCB. 2. SELF DIAGNOSIS ERROR INDICATES SHORT PROTECT. CHECK FOR OPEN FUSES F9A04 AND F9A05 PART # 283P043090 ON THE +24 AND -24 VOLT LINES. IF THE FUSES ARE OPEN THE CONVERGENCE OUTPUT CIRCUIT WOULD BE SUSPECT. 3. SELF-DIAGNOSIS INDICATES SHORT PROTECT. CHECK FOR A SHORTED IC4B01 PART # 270P261020 (VERTICAL OUTPUT) LOADING 24-VOLT SUPPLY LINE. LOCATED ON THE MAIN PCB.
Good Luck, big IRISH.
PS If too much call an authorizedservice center and have them give an estimate on their repairs in writing.
The protect message indicates that the output amp section has a problem. Normally this requires the replacement of the output transistors or the output amp pac. Expect the repair cost to be about $20-$60 for parts plus the local labor rate.
Unit is in protect mode there are a few problems that can trigger protect mode the most common is blown channel (shorted outputs). Sometimes one of the 15v regulators may go bad causing imbalance of supplys triggering protect mode. Also sometimes a bad solder connection could cause unit to go into protect also. I work for Denon authorzied repair center in Michigan if your nearby and Shipping to Michigan is economical let me know email@example.com
Not unless you know how to troubleshoot solid state electronics. If you disconnected the speakers and the unit still goes into the protect mode, most likely you have a short in one of the power output stages. Good Luck