Question about Onkyo TX-SR605 Receiver

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The amp protection circuit was actived - what should we do?

My husband was sliding the unit out from the cabinet and one of the wires
came out. He referred to the users manual and under trouble shooting it mentioned the amp protection circuit.

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  • 336 Answers

Remove all speaker wires from the receiver and turn it on.

If it still goes into protect, I'll bet the house that one of the channels is shorted out and it needs repair. This is a job for a pro.

If it doesn't go into protect, check for a short in the speaker wire or for a bad speaker.

Posted on Jan 29, 2009

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This is a very ambiguous post. When you say that you are having this problem, what are you doing? Please post all the steps that lead to this error. There is no way to disable the amplifier protection circuit. If it senses a short (which could be a bad speaker) then it will be activated.

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Relay?? I've never seen a guitar or bass amp with "speaker protection relays"...usually they're either on or off. Check the simple stuff 1st...is speaker cable from head to cabinet and/or the input cable from bass to the amp good? Check the "Direct Out" for a line level signal (must be connected to a PA or other amplifier) as this is your preamp out signal. Also, plug a shielded cable from "Effects Send" to "Effects Return"...this will verify "effects" loop issues if any. Lastly, vibration test...use a clenched fist across the top, sides and bottom of wood cabinet to lightly "jar" the internal circuits. If it starts working even for an instant, I would suspect intermittent connection inside.

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Impute jack on a kick back type cabinet. need to remove amp from cabinet to repair.


Very simple. Remove all black screws at top and sides of cabinet. Gently slide the amp unit out (towards rear). Done! :)
Don't be alarmed if you have to "tug" on it a bit. This is normal. Just don't try to "FORCE" it out.

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My qsc plx 3402 will not power up. I believe I shorted it out with my speaker cables


Most likely...shorted speaker wires, defective speakers or too many cabinets wired together can blow a amplifier channel in an instant. Manufacturers use to mount protection fuses on the exterior of equipment but people started replacing 3 amp with 25 amp automobile fuses and destroying internal circuits. You could pop the cover to look for a power supply protection fuse (same value replacement please) BUT be careful as there are sustained voltages after the unit is disconnected from the AC outlet that hold enough power to make this type work dangerous. I recommend sending it to a professional repair shop for a checkout and estimate.

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My amps protection circuit keeps cutting on and off when i hook up my amp


Hello m_george191,

Usually an amp will go into protection when there is a problem with the wiring, impedance load, or when overheated. Immediately when hooked up, it probably isn't overheating.

Most likely, there's a short or ground on a speaker wire, an input, or a faulty ground to the amp itself. Frayed or broken insulation, stray wires shorting across the terminal blocks, and shorted voice coils can all cause the protection circuit to activate.

First check your power and ground wires. Then disconnect the speakers and inputs and see if the amp powers up normally. If the amp still goes into protection with all wires other than 12V +, Ground, and Remote disconnected, the amp itself is defective. If it powers up normally with all other wires disconnected, reconnect the inputs one at a time to determine if one of them causing the problem. Likewise, reconnect the speaker wires one at a time.

Hope this helps.

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Hello mcis43fan,

The protection circuit can be activated by shorted or grounded wiring or it can be caused by a defect in the amp itself.

First, disconnect all wires except power, ground and the remote turn-on lead and see if the amp powers up normally. If it still goes into protection, the amp is defective, most likely shorted outputs and needs repair or replacement. If the amp powers up normally, test the other wiring for shorts and grounds. You can reconnect them one at a time to determine which one is causing the problem.

Hope this helps.

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Amp protection circuit has been activated


sometimes the protection circuit will enable because of a bad speaker i would suggest taking the load off of it by removing the speaker wires and turning it back on. if it stays on take an ohm meter and check the speakers should be between 2-4 ohms load.

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Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

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The problem is not with the inputs. This unit is in protect because a problem has been detected in the output section. Try disconnecting the speaker wires and turning it on. If the unit remains on, there is a short in one of the speaker wires. If the unit still shuts down, there is an internal problem that will require repair. It sounds like this is a new piece. If so, it should be covered under warranty.

Keep us posted,
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1 Answer

Tx-sr500 receiver


Hi,your fears are confirmed... the protection circuit is self resetting, and is operating because the amp will most probably have blown that channel as a result of the speaker wire short. At the risk of doing more damage(in the workshop,we always soft start an amp with output problems to prevent more damage)you could take the lid off, check and replace any blown fuses, be sure to use the same rating and type. If the problem persists, or the fuses fail again, it needs some expert attention. Off to the repair shop.... Good luck, and thanks for checking with FixYa

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