the above amp it starts normaly but after few seconds or one hour goes in protect mode for 1 to 3 seconds.that happens when cold for few times and amp run ok for 1 or 2 hours then can go to protect again for once or few times for 1 to 3 sec.makes me mad i have resolder everything under board.i have unsolder one by one neasured and solder new one every time to check if problem fixed all smal to92s trans.i have replace all 1448 and bzx diodes.change few suspect resistors ..symetry is perfect dc on output is zero to 1mv.bias is perfect and stable all the voltages are present.on thermal camera i dont see any overheating components just normaly temps on few bias and some relay resistors .when amp plays on subwoofers the sound is perfect and powerfull.anyone have experienced this problem?or any advice what i miss to check?thanks for any help.
-
Hello, I have a setup with NVR 16 Canais H.265 1080p HD PoE+ - TRENDnet TV-NVR416 that is using 10 cameras, some are outdoors. What would be the best way to protect NVR device from power surges? All ports are PoE so the NVR supply power to the cameras. NVR is pretty expensive so I would like to protect it somehow. Should I use some kind of switch that needs to be connected to the cameras, so it could "take a hit" if there is a power surge. Thank you! -
I have a Hitachi HTA-DD3W AV receiver and when I got it I tested it working fine with speakers but it needed a clean inside because it had signs of moisture in it but it was fully dry with bits of wood chips, I guess this was left in a shed so I fully disassembled it and cleaned it with isopropyl alcohol very carefully, some de-soldering was also needed but now its very clean, luckily there was no rust on any components and all the capacitors are fine with no bulging. When I turn it on I hear a relay switch on then a few seconds later another relay switches on or off and the display has a "-PROTECT-"... -
Hi,
i have Lenovo Thinkpad T14 gen 1 20S1 / SN: PF2M0XAG.
I moved resistor like every time and read MEC chip with SVOD4. I unlocked 3 other mainboards successfully but this one could not read. SVOD 4 Software says: "MECxxxx series in protect mode, work mass erase only". Like in screenshot.
What can i do?... -
Hi guys
I'm trying to repair this powered mixer. Sorry this is a bit long but I want to give as much info as possible to help get an answer,
As soon as it powers on the protect light comes on. There are relays that connect the speakers to each channel of the amplifier but they never click. If I connect a 60W light bulb in series with the mains supply it comes in bright then goes to maybe 30-50% brightness - it seems to dim a little further over time
I have power to the amplifier, I think it was as about plus/minus 50-60V for the main amp, and plus/minus 15V... -
I am planing to build all in box variac, isolation transformer and current limiter, and just want to ask, if is current limitted like 1A, and on variac is set low voltage, is there something circuit or design that prevent variac, ammeter or fuse to burn? Say to test some device, starting from 0v, while ocasionaly get shorted......