RR501 - Remote control transceiver

There are at least two different version of this module. Open it up by removing the screws and remove the pcb.

Change capacitor C26, usually blue, (2E225) from 2.2uF/250V to 1uf/400V. Fix this one with silicon or epoxy glue.

Change capacitor C10, also usually blue, (2E224) located close to the output connector, from 0.22uF/250V to 0.1uF/400V. It could be called anything else than C10 in other versions.

Check that the 330k resistor, close to C26, the big capacitor, is 1/2W. It should be physically bigger than all other standard resistors. If not change it to 330k 1/2W.

Change the 220K 1/2W (in some models 1/4W) close to the output connector to 470k 1/2W.

Change the 130V MOV in parallel with the input to 250V RMS. If you have 230 or 240V use 275V RMS.

If there is a resistor of 330k 1/4W going to the output connector, change this one to 470k 1/2W.

The built in appliance module is using a cam relay with a 110V coil and is quite useless and noisy. I did not try to modify this part so I just disabled it. Just cut one of the white wires going to the coil of the cam relay. Cut both ends so nothing can move around and cause a short circuit.

I prefer to desolder the incoming power connectors and replace them with a cable with my own connector. Use a big, 100W, soldering iron and remove the blades by heating them up and push them through the plastic case.

Also cut away the plastic support for those blade in the box giving you more room for your new cable. A good place to make a hole is in the big square hole on the bottom side close to the outgoing connector. Drill inside the big square hole another round hole towards the center and pass your cable through. Solder the cable to the big pads where the original incoming connector was.

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