Question about Sony STR-DE597 Receiver
This is the second time this has happened to my receiver, the first time it was under warranty. When I turn on the unit it clicks on and then a couple seconds later clicks and goes into protection mode. RThe unit is not really worth having it repaired, so I was wondering if anyone might know how to bypass the protection module. I dont care if the receiver blows up, as I will be upgrading within a year. Just hoping to get a little more use out of this unit. Thanks- Clayton Kirchhoff
I've had a Sony STR-DE725 for years, and it's always worked fine, until recently. When I turn it on, instantly, or within 1 minute - it will "click" and then display "PROTECTION". Like any good DIY'er, I googled everything - so I looked for any loose speaker wires, and finding none - decided to open it up. I pulled it out on my workbench, opened up the case, and blew out about an inch of dust from everywhere with an air compressor. Next I disconnected and reconnected every connection that I could easily reach. Finally, I unscrewed (about 1/4 turn) and re-tightened every single screw that I could reach in the guts of the receiver. It works fine now! Go figure... probably the dust, or a loose connection somewhere. Definitely try this first, as you have nothing to lose but 30 minutes of your time on a weekend!
Posted on Jul 08, 2007
I have the same problem. I took the unit apart and found the connection that was causing it to flash protect (no idea what it was). I left it unplugged and hooked everything back up and all works fine. I obviuosly bypassed something with the amp/ speakers. Kindof worried about blowing/ over heating something now. Any thoughts?
Posted on Oct 17, 2009
I read a few of these and thought, how can tightening a few loose screws on circuit boards really do anything? But since I had to start somewhere I popped the cover off of my Sony GX69ES and tightened about 20 of the screws that hold the circuit boards down, plugged it back in and holy cow! No more evil 'P' flashing in silence! Thanks for the suggestions.
Posted on Feb 28, 2010
I have had problems with my spare GX69ES going into Protection Mode for years. Every time I "fixed" it, it would be OK for a few minutes, hours, or even a day or two, and then go off again. I was thinking of buying a boat... I already had the anchor!
Instead I purchased a workshop manual *, so that I might figure out what was happening...
I measured the bias settings for the main amp. Sure enough the readings were way out. The in-balance was helping trigger the protection sensor circuit. I adjusted to the correct values and so far, after three weeks, Protect has not kicked in once.
Bias voltage should be 2.5 mV, measured on TP701 (near main heat sink), pins 1 & 2 for left and pins 3 & 4 for right. Adjust RV701 for left and RV751 for right. Speakers OFF, volume ZERO. Test meter reading will settle to value within 30 seconds of switch on.
*A great manual with full circuit diagrams, circuit board layouts and compponent lists. A bargain at $12.99.
Posted on Oct 28, 2012
I had this problem continually until I upgraded two low-end speakers (4 ohm) to 8 ohms, which is the rating for my other speakers. Problem solved.
Posted on Aug 23, 2010
Aws I said on the last post do not jump out the protection relay as your speakers will blow up and so may your house!!!!
Posted on May 05, 2006
I think i would rather figure out WHY its doing it rather then bypassing it. I dont think they just blow for no reason. To much bass? to loud? are the speakers stiill good? do you have a multi meter? what do the ohms read on each set of speakers? Speakers have limits even though they come with a system they can still be under powered. You would think the speakers could handle the system they come with but that usualy isnt the case. Hooking up more then 2 speakers can blow the amp, over heating (to loud for to long of periods, blown or shorted speakers) unplug all the speakers and try and turn it on, then one at a time hook the speakers back up.
Posted on May 06, 2006
Protector with STR-DN840.
Repair tech : "it's too old (5y) so cannot get parts, too bad"
Tried the recommendation above : tighten screws, replug power cables.
It works fine again !
Otherwise I would have checked and replaced power amplifier output transistors, emitter resistor and base drive resistors (std electronic parts).
Also I found in the service manual :
PROTECTOR AUTO OFF To disable auto off after protector occur. Procedure: 1. While pressing display and movie button to turn on the main power. 2. “PROTEVER” appears and switch on the set.
Finally I found the real problem !!!!
Just the cable on the outside speakers.
The PROTECTOR mode doesn't go off easily.
You must wait 30mn before testing each speaker (or open the unit, clean the dust, tighten the screws, have a coffee) to find which one is faulty...
Posted on Jun 19, 2019
Make open the cover clean print and all solderings before resolder the active components and loose solderings if there are active components look for brown spots especially after a long time of use on the print there can be little problems to measure or components fuse resistors or other components with loose paws and Tighten the screws of all the transistors that are mounted on the heatsink a little bit because after a long time they become sometimes loose because of temp changes over the years
Some capacitors can over time become deformed especially in the lower voltage range in the power supply for who is searching for a manual here is and use some contact spray for connectors and potentiometers . AND especially measuring and boldly go forward!!! reed?
SONY STR DE597 VER1 0 SM Service Manual free download schematics eeprom...
Posted on Apr 28, 2016
If its goes to protection it means the power supply is OK .So try accessing the Amplifier circuit. Carefully take out the Amp I.C and then put back the system together, power it ON and listen carefully if the second relay switches ON. The problem is the Amp I.C and some burnt out resistor espacially 2.2 Ohms on the amplifiers output line .Replace the AMP I.C & resistors with a genuine parts or else u ll replace the I C everyday.
Posted on Oct 26, 2014
Check the resistance (ohmage) of the speakers and get one that match to your amplifier
Posted on May 15, 2014
Hi, I had this very problem with my Sony 5.1 home theatre amp - after a few seconds it would go into 'protect' mode and would not play sounds. Having checked all the usual causes such as wires/ shorts etc I took the outer case off revealing the 'workings' and just tightened up every cross head screw I could find. Since then it has been perfect. Might be that I had a bad earth???
Posted on Jun 12, 2007
You might have a grounding issue with the circuit. This could be caused by missing screws or screws that might have fallen out and are floating around in the case. I was recently repairing this exact system and it also went into protect. I opened it up to take measurements and quickly found out that all the screws have to be in place for the machine to operate. I put the missing screws in place and now the system works correctly. WIERD!!!!
Posted on Jun 05, 2007
My husband had a similar problem with his Marantz SR-68 receiver. After reading the above, he went to the back of the receiver and unplugged one cable at a time, and with each removal of a cable he'd test the unit. He had 2 speakers in the basement that were unconnected from the speakers. When cleaning, I must have bunched the cable into a pile. When he checked it out, both speaker wires were touching each other. After he separated the speaker cables, the receiver is working GREAT! The protection light is out, and he is putting caps at the ends of the speaker wires for his older style speakers. TpK
Posted on Mar 11, 2007
I was having the same promblem with my receiver. I would disconnect everything and start over. Then I discovered it was the speakers. I had small speakers from another system. They were not big enough for the receiver. change your speakers!!!!!!!!!!
Posted on Aug 06, 2009
SOURCE: stuck in protect mode
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.
Posted on May 29, 2009
The protect mode is a result of the heat not the cause. What is likely to be hapening here is that the amplifier is seeing to small a load. The amp is designed to work with speakers that are either 4ohms or 8ohms in impedence. An impedence load of 2 ohms will work but will cause the amp to work really hard and generate extreme heat. The solution to this is usually to locate speaker wires that may have crossed or frayed and shorted against each other. Were the amp to have a problem, you would not likely be able to get sound at all.
There is a possibility that the driver circuit within the amp is out of whack too. This could cause an imbalance internally that would also generate excessive heat. This is extremely rare, as this type of offset generally is caught by the protection circuitry.
Check the speaker wiring first. Next, if you have 2 speakers connected, only use 1 at a time. It is possible that there is a defect in the speaker where the laquer on the voice coil has worn away and the coil is shorting to the speaker frame intermittantly. If this is the case, the unit would behave differently depending upon the level of sound and the type. Also, it is unlikely that 2 speakers would have this problem. Disconnect 1 speaker and run the system for a while. If it works well, try the other. If a speaker is the problem, one of them should show the failure.
Please keep us posted.
Posted on Feb 17, 2010
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