| Modifying the RR501 Remote
Transceiver
I have successfully completed this modification
three times, however, and I accept no
responsibility for the effects of anyone making these modifications.
You follow these instructions at your own risk.
(I've been advised by Mike Greenleaf that the C25
and C26 annotations may be reversed, so please check this; I'll update in
due course).
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. This is the large
capacitor.
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. This is the smaller
capacitor.
Check that the 330k resistor, close to C26, the big capacitor, is 0.5W.
It should be physically bigger than all other standard resistors. If not
change it to 330k 0.5W.
Change the 220K 0.5W (in some models 0.25W) close to the output
connector to 470k 0.5W.
Change the 130V MOV in parallel with the input to 250V RMS. If you have
230V or 240V use a 275V RMS MOV.
If there is a resistor of 330k 0.25W going to the output connector,
change this one to 470k 0.5W.
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 de-solder 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 centre and pass
your cable through. Solder the cable to the big pads where the original
incoming connector was.
I have had a report from Mun Wai from Malaysia that there are two MOVs
in this module, so both must be replaced with 275V MOVs.
If you attempt these modifications, please let me
know your results, and read the warning on the X-10
240 volt modifications page. |
Redoak
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