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Protect indicates that there is a short or a grounding problem usually within the speakers or the speaker wiring. Locate and press the reset button (pinhole). If protect comes back then disconnect all speakers, reset and connect them back one at a time until protect shows up again. This will help you find out where the unwanted DC signal is coming from. If protect shows up when all speakers are disconnected, then it may need service.
The unit goes on protected mode when an internal fault is detected.
Try disconnecting the battery cable for five minutes . If there is no fault you will clear protected mode.
If the unit still goes on protect, then check the wiring at the back, a short in there can trigger protectedd mode. If that does not work, then there is an internal fault. In that case the unit must be disassembled and tested.
Turn on the car so the radio is flashing "Protect." Look on the front / removable face of the stereo. On it you will find a small round hole - that's a reset button. Find a small paper clip, unfold the clip and stick it gently into the hole. The "Protect" will stop flashing, and Kenwood will be displayed. Unfortunately all your settings/presets will be gone, but at least the stereo is working again!