Originally written and posted 2 June 2001.
Content last modified 2 June 2001.
External links last verified 6 February 2005.

SD533 Sundowner Mini-Controller

I happen to have two SD533 Sundowners and no MC460 Mini Controllers. I strongly suspect that most everything i have to say here applies to both. And i don’t really have too much to say, since the Sundowners have been very reliable for me (once positioned correctly!).

SD533 Alignment

To ensure successful alignment, please be sure to read important information common to all X-10 alignment procedures before proceeding.

Frequency Adjustment

1. Unplug SD533 and remove the 4 screws holding the bottom cover in place.
2. Position the two halves of the unit in a fashion which allows easy adjustment of the two transformers.
3. Connect frequency counter to circuit common (easily found by inspecting PCB) and pin 15 of IC U1.
4. Connect SD533, via isolation transformer if needed, to A.C. line. Allow time for counter to stabilize.
5. Adjust transformer T2 for 240kHz. This oscillator gets divided by 2 to generate the 120kHz PLC.
6. Unplug the SD533 and disconnect the frequency counter.

PLC Output Amplitude Adjustment

1. Move the SD533 to the location where it will be used. Bring along oscilloscope and powerline signal sensor; connect these to a separate circuit, or at least an electrically distant outlet on the same circuit.
2. Set up oscilloscope and powerline signal sensor to monitor the A.C. line.
3. Connect SD533 directly to the A.C. line.
4. Press and hold Bright or Dim button to generate continuous PLC.
5. Adjust transformer T1 for maximum 120kHz signal amplitude. This is likely to be a broad, “low-Q” peak.
6. Unplug/disconnect all. Reassemble SD533.

World O’ X-10

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