Question about Sony XM-1252GTR Car Audio Amplifier

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Protector light is on

How to disable protection mode

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Hello justin83wint,

If the amp goes into "protect mode" immediately upon power up, it's most likely a short in the power/ground or speaker connections. If it operates normally for awhile and then goes into protect, it's most likely overheating.

In the first case, I'd suspect something in the wiring. Go here to troubleshoot the possible causes.

An amp will most often go into protection from overheating due to being operated at too low of an impedance load. Check the speaker specifications and wiring and make sure that the final impedance load matches the amps rating.

Hope this helps.

Posted on May 10, 2009

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1 Answer

Red power/protector light


The amplifier has gone into protect mode and will stay in that mode until the cause is corrected.

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The protection circuitry has been activated 3 times consecutively and as a safety precaution, capability to turn on the power is disabled.


If there is no apparent cause for the protection mode activating (such as shorted speakers, burning smell, blown fuses, lighting strike or mains power surges), reset the protection as follows and see what happens.

Connect power cord to mains and wait 5 seconds or so. While holding down "info" and "tone control" buttons, press "main zone" power button briefly and release, but keep "info" and "tone control" buttons pressed for at least 3 more seconds. The unit should power up. Assuming the reason for the protection has passed or been fixed, the unit can now be turned off and then back on with the "main zone" power button to restore normal operation mode.
If the protector activates again, the fault is still present and the unit needs to be repaired, ideally by a Yamaha authorised repairer.
There are dangerous voltages present in high power amps and a lot of grunt in terms of stored energy - best left to trained technicians.

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1 Answer

What's your problem?powerprotection mode unlock


If the protect function works and causes hindrance to trouble shoot, cancel the protection function as described below, and it will be possible to enter the self-diagnostic function mode. (The protection functions other than the excess current dtect function will be disabled.)

While pressing the "Tone Control" and "Info" keys, press the "Power" key to turn on the power and keep pressing those 2 keys for 3 seconds longer.

The seld-diagnostic function mode is activated with the protection functions disabled.

In this mode, the "Sleep" segment of the Flourescent Display flashes to indicate that the mode is self-diagnostic function mode with the protection functions disabled.

Caution!!!! Usiong this product with the protection function disabled may cause further damage to your unit, so use special care when using this mode.

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1 Answer

Flashes protector


Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

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You cannot disable it. It is meant to protect the unit from producing more power than it is designed to. When you turn it on, turn the volume all the way down. Beyond that consult the back of your manual for trouble shooting and service information.

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RCA 27' tru flat sdtv- power light comes on- no display,no sound.


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If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, read through the following page. I'll assume that you've checked the amplifier's on-board fuses.

Amp in Protection - Troubleshooting

Let me know if you have any other questions.

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6310 Officejet all in one


Are you running AVG 8 free anti Virus? Did you install it recently? There are some reports that AVG 8 free version has some issues causing this to happen with VISTA. If so try printing with AVG turned off (Careful where you go on the internet while it is off - suggest a trusted site like microsoft)

Then try with AVG running and disable IE7 protected mode,

Click Tools, then click Internet Options.

  1. Click the Security tab.
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Note: Enabling or disabling protected mode requires Internet Explorer to be restarted

If it is AVG causing the issue perhaps try and see if they have a later version available as it is not recommended to run with protected mode disabled

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1 Answer

Protector flashing


Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

Oct 05, 2007 | Sony STR-GA7ES

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