I look at it via a camera, some leds are working, some are not. Check if the power adapter has been connected to the transmitter 9. Pinout of an IR sensor: 1) Ground. 1. Open the battery compartment on the back of the remote and check if the batteries are properly placed in their respective terminals. IR sensor gives 0 in this condition. 2) 5 volt. The IR sensor is a hybrid solution that combines an IR laser sensor triggered by a tiny mechanical lever. 8. Hello - I cannot get the filament sensor to work on my Mk3S (kit): always the "ERROR: Filament sensor is not responding, please check connection" message ; FW is 3.7.1-2266 - sensor cable connection checked ok, on the lower pins row of the connector,- the sensor got replaced with a new one (ordered from Prusa); no change I am not trying to detect if it's transmitting, just if it's 'on' or off. And IR sensor gives 1 in this condition. How to Fix Any NOT WORKING Infrared Remote Control: Have you ever encounter you grab your remote control and turn your appliances on and it doesn't work you think it's just a Low Battery situation that it could be FIX, But when you change it it doesn't work at all and you give up you just toss your r… Please ensure that the IR receiver and the IR extender cable have been connected properly and that they are fully plugged in. Electronic Glitch Check I 3) Enable. Clean the upper edge of the remote control where the Infrared Eye or the IR sensor is present. Assuming you have proper current control resistor in series with the IR LED, turn on the power Supply and measure the Junction voltage across the diode. 10. If the IR led is working, ie, conducting, then when the IR Led is present, the regular led will turn on. Infrared Sensor. If that doesn’t work, 2. Basic Check. 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