Question about Sony STR-DA555ES
We have a Sony DA555ES receiver that has worked just fine until a guest fooled with the settings and now it displays ''unlock''. We have tried unplugging the unit to reset it and still receive the same message. How do we unlock the system so it will work?
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Posted on Jan 02, 2017
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
Disconnect all speaker wires at the receiver. Then power the unit on, if it stays on, post a comment on this thread and I will help you troubleshoot further. If "Protect" remains on, you need to have your receiver serviced. Hope this helps.
Posted on Aug 23, 2009
SOURCE: flashing word "Protector"
Usually a protect fault will indicate a bad transistor in the amplification section. I suspect that the control circuit is sensing a fluctuation in the power supply and going in to protect mode. (assuming that the protect circuit itself is working properly) If a voltage is too high the unit will go in to protect mode to prevent damage to the speakers and the rest of the unit. I would take the unit in to a local repair shop and get a estimate of repair charges. Expect a 60 to 80 dollar repair charge depending on how many parts need to be replaced and what the repair labor rate is in your area.
Posted on May 05, 2010
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