X10 control from the two HR12A remotes got much worse over the last few months and eventually failed completely, which meant I had to actually walk over to the lights and click the switches. Not to be tolerated, sez I, so I would walk to the bedroom and poke the appropriate buttons on the wired controller (long since obsolete) by the bed. That worked perfectly, which eventually convinced me to dismantle the TM 751 transceiver.
It’s not good when soot plates the case:
I like how they capacitively coupled RF from the antenna for complete line-voltage isolation.
The PCB looked like it got rather hot over there on the left side:
A Zener diode on the component side of the PCB looked a bit toasty, so I decided this gadget had passed its best-used-by-date and dropped it in the electronics recycling box (after harvesting the antenna, just in case).
A new-in-box TM 751 from eBay arrived a few days ago and works just fine.