Question about Teac AG-D8900 Receiver

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The stand by / protect mode is not allowing the receiver to turn on. How do we fix?

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There are a few things that could cause this issue - I first recommend putting a bright lamp next to the unit with the light shining directly onto the top for overnight. In the morning, turn off the lamp, wait 15 minutes, and try the unit. Moisture in the unit may cause it to go into protect mode and the lamp should evaporate the moisture. As this is the most common reason in humid areas ( coastal regions or areas with lots of rainfall or fog) I would try this first. The problem could also be more severe, like a mis - alignment of the power plug, shorted printed circuit board, burnt resistor / capacitor,etc. and having it inspected by a repair facility may be the best solution of the lamp doesn't do it. I would also check to make sure it is plugged in properly ( fat blade in the fat part of the wall plug or reversed plug into the unit if the power wire is removable from the unit). Modern electronic components are not usually user serviceable, with the exception of a fuse mounted into the back of the unit, and specialty equipment is needed to diagnose and or repair. If you live in an area I described above and have not used this unit for some time - or just purchased it - the try the light trick to get rid of the moisture. I hope this helps and Thank you for using Fixya!!

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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1 Answer

To fix cpu on protection mode


I am highly skeptical that the CPU is the problem; protection mode is designed for protection of the amplifiers.

Use an artists brush to remove any dust and grime off the voltage rails and heat sinks. Reinstall the CPU and the chassis cover. Turn your attention to the rear connector panel; check for any broken or loose speaker terminals. If your speaker wires are still connected look for any stray wire strands and pull them off or bend them away from the connector panel. Check the connection for tightness, or simply disconnect any corroded wiring that you may not be using a banana or spade connector with and clip and redress it. Perform the same inspecting and maintaining procedures on all of your speaker channels.

When placing the receiver it must also have adequate air flow around it. Anything you can imagine that would allow the unit to retain heat increases the chance of it getting it into protect mode for thermal protection. Out in open air is best.
When the receiver is properly positioned and all connections are secure, power it up; it will likely still be in protect mode. If so, press and hold the power button down until the unit "clicks" inside the chassis; this takes approximately 15 seconds. Protection circuit is reset and you can now operate the receiver.

Feb 21, 2012 | Sony STR-DE597 Receiver

1 Answer

Receiver goes to stand by when turned on. All components and speakers disconnected and still goes to stand by. Any suggestions?


This is most likely a "protect" mode. A problem has been detected and the unit shuts down to prevent further damage. The most common cause of this are defective output transistors. Plan on a parts cost of $25-$40 for this repair.

Dan

Jun 15, 2010 | Onkyo TX-SR500 Receiver

1 Answer

AVR-1508 7.1 Channels Receiver: My Denon AVR-1508 won't stay on. Once I try to tak...


Not familiar with this model but seems like the protection circuit is kicking in, this could be caused by an imbalance of Ohms between channels or a short. remove & check all speakers and cables for continuity or shorts, does the unit power on without speakers or in a different mode (surround off).
always add speakers in pairs (L&R) before testing to prevent possible protection circuit, test main speaker pair first then add surrounds (all according to the allowable Ohms range for the amp of course)

Nov 18, 2017 | Denon AVR-1508 Receiver

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Unit turns on for about 5 seconds and turns off with stand by light flashing


you have shorted output transistors which is causing the unit to go into protect mode. You can try factory reset by turning off unit then holding down speaker a and b buttons then turning back on.

Apr 12, 2010 | Denon AVR-681 Receiver

1 Answer

Hi, after i turn the power on and then press the stand-by button, it clicks off to stand-by mode instantly. This is an Onkyo TX-SR500


This indicates that the system is going into protect mode. First disconnect all speaker wires (with the power cable disconnected). Then turn the unit on and see if it sill shuts aff ofter a few seconds. If it does not, then you have a problem with the speakers or speaker wires. inspect the wires at both ends for frayed strands that may touch. If that all lookd good, plu the speakers in, one at a time, until the problem reappears. Be sure to turn the sytem off before plugging in any speaker just to prevent any accidental short which could be catastrophic. If the system goes into protect mode with all speakers disconnected, you probably have a shorted output transistor.

Apr 05, 2010 | Onkyo TX-SR500 Receiver

1 Answer

Onkyo AV Receiver turning off - by its self.


The space you have provided should be enough. If this is a new unit and still under warranty, I would request warranty service. It sounds like the unit is entering protect mode. This may be due to heat or it could be because of a defect in the protect circuit. In any case, this should not happen that quickly.

Update this if not under warranty and I'll provide a list of diagnostic tests to help determine the problem.

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Jan 16, 2009 | Onkyo TX-DS787 Receiver

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Sony STR-D665


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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Stuck on standby


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 kstahl65@att.net

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try to soft reset the recievers by unplug for a while and replug and try power on , or hold up the rear reset butomn and press power at the szame time then release both

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1 Answer

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There is a problem with one or both of the audio amp circuits. The amp is going into a protect mode as to protect and save your speakers. Sorry but there is no simple fix. this will need to go to the shop to be diagnoised. Good Luck

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