![]() ![]() I could not see any evidence of arc damage either (to begin with). There was not much dust on the PCB's (amazingly). The cooling fan appeared to operate for a few moments when the unit was powered on and would spin down after the unit returned to Protect mode. * At first glance inside the unit, all looked pretty normal. The Display/Faceplate card (controls the LED display, responds to IR Remote Controls, volume, front buttons, etc. The Logic/Controller card (where the brains of the unit are (Optical fibre processing, decoding software, etcĤ. The Power Amplifier Board (contains the audio input/output jacks, fibre optic inputs, the PA stages, speaker jacks, etc.ģ. The Power Supply (takes the incoming mains and converts it to DC suitable for the rest of the unit)Ģ. * I visualised the insides of the unit as separated into 4 main sections.ġ. These all looked good - used a multimeter to confirm no short circuits there. * I took the cover off the unit to inspect for possible shorts or burn marks near the speaker connectors. But as soon as it finishes, it resumes Protect Mode again. It successfully completes a full FM Band scan (even detecting stations with RDS). Powered off the box then powered back on while holing the "Input Selector" button down. * Performed an FM Station "Auto-Betical" Scan (whatever the hell that is?). ![]() The initialisation process completes then the unit returns to Protect Mode. * Performed an "Initialisation Reset" (powering off the unit and then holding the power button for 5 seconds as the unit comes back on). * Disconnected all speakers, sub-woofer, RCA inputs and outputs, etc and powered on. Here is what I have done and am going to do (still haven't got a solution yet). When you power up the unit, you can hear a relay on the power supply board making a loud "click", the display will light up and then 2 seconds later, the words "PROTECT" start flashing on the screen. Hello to all the Googlers who have been searching for a solution to the same problem as us! have u managed to find a solution yet?įirst of all. If none of that makes sense then i apologise. i suggest checking each speaker and its corresponding wires, and make sure that they aren't shorting out (although the speakers themselves should have an impedance between 4-16 ohms) Usually a system like that would "protect" itself from speaker wire shortages, or being turned up too loud. I suspect an internal component failing due to heat/time but don't know where to look. I have tried isolating each speaker in turn but have had no success. The fault with the system is that after varying degrees of time the sound will trip off with a loud clicking sound and a flashing "PROTECT" message appears on the front screen of the box. I have a Sony STR-KSL40 home cinema box/processor. I wonder if anyone could help with this problem. Posted: Tue 8:43 am Post subject: Sony STR-KSL40 "protect" message. FAQ Search Members Groups Register Profile PM's Login/OutĮlectronic equipment repair and service manual search discussion Forum Index
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