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Dial lights up, all control functions O.K. bou no sound.

Checked P/S output- O.K. There is power on the system, but none on
the Amp. section. No voltage on output transistors, and heatsink remains
cold. No output from any speaker, though set seems to be alive.
Is there a fuse or relay for the Amp section which may be open?

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Hello: Thanks for your feedback. I was surprised that the type of unit and manufacturer did not appear with the request for help, because without that information it made no
sense. However I did resolve the problem by experimenting with the controls and connections on the unit. Just got it.
Thanks again....

Posted on Sep 02, 2008

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Mercury mariner 2007 horn blows none stop how .how do I fix the porblume Also where is horn relay located


It's inside the SJB - smart junction box ! It's non - serviceable . Is the air bag light lit on the instrument cluster ?Do you know what a smart junction box is ? It's a electronic module with a fuse / relay box built into it .

Module Controlled Functions The smart junction box (SJB) is the multifunction electronic control module on this vehicle. The SJB is a combination of a multifunction control module and a central junction box (CJB). SJB functions control multiple systems, which include:
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The SJB is located under the front passenger side floor console. For removal information, refer to Smart Junction Box (SJB) in this section. For additional information on the interior lamps and illuminated entry, refer to Section 417-02 . For additional information on the exterior lighting, refer to Section 417-01 . For additional information on the power door locks, the RKE keypad, and the RKE system, refer to Section 501-14 . For additional information on the rear windshield wiper, refer to Section 501-16 . For additional information on the perimeter anti-theft, refer to Section 419-01A . For additional information on the climate control system, refer to Section 412-00A (Escape, Mariner), or Section 412-00B (Escape Hybrid). For additional information on the warning chimes, refer to Section 413-09 . For additiona information on the TPMS, refer to Section 204-04 .

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I have an old Peavey Transfex Pro 212s that spent several years in storage. It's had the battery-less modification. The unit powers on fine but will not output sound past the preamp.


I am thinking what if the power amp has a separate power supply to the pre-amp. If it does then something in that is causing the problem. If it doesn't then it's something on the power amp board. Perhaps a voltage regulator. If the power amp is a single IC job replace it. Another possible cause is if the volume control is done via a single IC. If that has gone it would cause the strange things that are happening. One thing is certain it's something that both channels pass through the device that is faulty or it effects both channels.

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It sounds that the audio output section circuit has the fault. Check it audio out pre-amp sockets at its back, connected to any external Amp. See whether audio comes out by this way. If not, the main digital board is faulty. If yes, audio output section is faulty.

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NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

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Sound clarity not good beause distrubing sound


It depends on how the sound is heard, if the sound is distorted then the amplifier section must be checked, It can be fault in the power output IC, fault of the bias or fault in the pre- amp section.
Secondly if the sound is jarring then the speakers needs to be checked, it can be problems on the diaphragms or coils.
You will also need to check or switch source of sound to confirm if this was from a source.
Also an AF signal test and injection will confirm the stage that is effected.

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You will have to remove the unit to check the Sub amp for failrue of the power section or the output.
Unless the power circuit is checked with a flow chart , starting from the power in, the power supply and supply to the circuits and outputs. any weakness in these sections can cause fault , unless checked the estimate cannot be drawn.

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1 Answer

I have a 2005 Maxima, the other day I heard a pop sound and my bose stereo system (the sound) stopped working. My son replace the AMP but still no sound. Everything else is still working, ie the display...


did you mean that the output was replaced or the whole amplifier?
The pop sound along with the sound loss can be attributed to a failure of a component , most possible is a capacitor when the aluminium top bursts. So open the amplifierr to look for pieces of the component that burst out and you can piece up them to confirm.
The powerr to the section can also be faulty or open due to this so the voltage must be checked to be in order.
The possible area can be the power supply circuit or the output of the amplifier.
Test from the power supply section down to see the power into the preamp and power amplifier output section. make sure that the input selectors are also working in the command of the main controller.
Checck only with some knowledge of these circuits otherwise take help.

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your convergence output amps are done...
you have to do repair on the convergence output circuit, and inspect
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1 Answer

Need help


I think, your Home theater gives you error message " protect unplug", means home theater has problem in Amplifier section and will not be power up to function.
You should check Amp section aspacialy Amp Output stage.

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