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[dan]

This might have been discussed before, but
I've been digging through the posts and I
cannot find anything...

I see several people talking about the
CM15A schematic. Where did you get it from?
I need to look at some issues with my unit
and the schematic would help a lot.
And on the same subject I could also use
the schematic for the LM14A 2-way module if
anybody knows where I could find one.
Thanks.

[SteveRF]

Here is the FCC schematic location
https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=347598&native_or_pdf=pdf
Regards,
Steve

[Brian H]

The cm15a is on the FCC web Site as mentioned. The B4SCM15A is the FCC code it is registered under. Remember that the one there may not be the latest as X10 has made changes in the cm15a. My early vs late one has differences. The LM14a is not there as it has no RF transmitter. You may find it on a third party web site like http://www.idobartana.com/hakb/index.htm or www.mbx-usa.com

[dan]

First of all, Steve & Brian: Thanks for
your help. I got the schematic for the
CM15A. Like other people have said, looks
like there is lots of room for improvement
regarding battery life on this thing. One
of these days I may open up my unit and
make some changes.

I'm still looking for the schematic for the
LM14A if anybody has one, as I couldn't
find it anywhere on the web. I have an
issue with my LM14A units (all of them) and
it would be much easier to look into it
with a schematic. Basically, if the ambient
temperature goes above ~ 80F my LM14As will
work for a while and then turn OFF suddenly
(full OFF, no fading) and then stop
responding to commands. A few degrees
cooler and they start working again, even
if they haven't been unplugged at all.
It's clearly thermal, only happens in the
summer on very hot days (yeah, I don't use
my A/C much...).
Thanks,
Dan

[Brian H]

You are welcome. Be interesting to see which
version of the cm15a you have. My older one
has a soldered in controller chip [firmware
burned into it] and rhe RF Receiver has a
tunable coil. Newer one has a controller
chip in a socket and a nontunable RF
Receiver or one where it is tuned by coil
bending, and the antenna is hot glued to the
main board in a large U shape. Old one has
the extra in a big random ball of wire. I
will still be looking for the two way
schematic. Sure sounds like a thermal thing.

[Brian H]

You sound like you have electronic
knowledge. So one point. Most X10 modules
use a line derived power supply. So the HOT
AC lead is most times the modules common.
Working on an exposed module can be a
sparking surpries if one is not carefull. I
made a small isolation box using a 50 VA
transformer just to be slightly safer. My
RR501 tranceiver after a few years is now
showing a discolored PC Board near the power
supplies zener diode and dropping resistors.
The cm15a along with the TR16A and PH508
[ones I have knowledge of] use a small power
transformer and are safer to test.

[Brian H]

Think the cm11a also has a power transformer.