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TM 751 (Wireless Transceiver Module)
This thread has 8 replies. Displaying all posts.
Post 1 made on Wednesday September 6, 2000 at 10:47
Mike Zelikov
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Has anyone seen fully working one? I got one with firecracker kit. It makes very bad clicking sound when using device 1 (on/off) on any housecode - others are ok. And it has the same dimming problem as a lot of people noticed here - when dimming, the light goes down to the end and then the module stopes responding, nothing helps - need to unplug and plug again. I want to be sure that mine is bad one that there are good one over there. May be someone can reccomend better model. Thanks!
OP | Post 2 made on Wednesday September 6, 2000 at 12:17
Historic Forum Post
I just posted yesterday having the same problem. I actually started out with the transceiver that came from the Firecracker kit also. No problems with that transceiver. The one I had problems with came with the Active Home kit. Whenever the appliance switch that is incorporated into the transceiver was turned on, it would dim all the way off with just a brief push of the dimming button. Then it would freeze up for a minute or two. If the switch on the transceiver was off then everything worked perfectly. I just sent it back to X10 for replacement yesterday. As far as the loud clicking sound, that seems to be pretty much how it is supposed to operate. I get a loud click on the transceiver as well as the stand alone appliance modules. I did start using an appliance module from Magnavox yesterday that is a little quiter but the click is still quite audible. The Magnavox does hide the home code and unit code dials though and is a nicer color than the just plain white.
OP | Post 3 made on Wednesday September 6, 2000 at 12:28
Chris Hussak
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I was having the exact same FRUSTRATING issue. I was dimming rope lights, plugged into a lamp module, and when I hit the dim button on my X-10 Palm Pad, the light would dim all the way down and then everything would freeze until I unplugged the XCVR for a few seconds and plugged back it back in.

I have since added an IR543 and have had NO issues. It seems when the command is initiated through the XCVR it has trouble communicating with the modules and gets "stuck". I'm no expert and maybe someone else can explain better, but the IR543 or other "plug-in" transmitters seem to send a stronger signal to the xcvr.
OP | Post 4 made on Wednesday September 6, 2000 at 13:19
mike ellaby
Historic Forum Post
The TM 751 is no good. Seem's to be a common weakness with these units. Also I've broken the top screw (on 2 separate tm 751's) just by pulling the unit in and out the AC socket.
OP | Post 5 made on Thursday September 7, 2000 at 10:33
Mike Zelikov
Historic Forum Post
So are there any alternatives?
OP | Post 6 made on Thursday September 7, 2000 at 19:23
Mike Ellaby
Historic Forum Post
Mike- I'm using a RR 501 unit that came with Activehome.
It's a little larger(stronger built) and can accept commands off the A.C. It has'nt given me any problems so far. I've got a couple of 751's on different codes and they work fine also, except that dame top screw pulling out;a little tape and their fine. If your 751 is still under warranty explain to them the problem and they might send you one without having to send back the defective one. Good Luck
OP | Post 7 made on Sunday September 17, 2000 at 02:02
Historic Forum Post
The transeivers are not malfunctioning.
That loud "clicking" sound is a heavy duty relay inside to turn on the appliance attached to it. It doesn't support dimming since it's just a relay turning on/off. I believe that sending a dim command to the unit code it's set to will confuse it. All appliance modules work the same way. They are rated for bigger appliances like stoves, microwaves etc... and those types of appliances should never be "dimmed". Not by an x10 module or a standard dimming switch you install in the wall. If you want to dim a light rope or control the speed of a small fan, use the dimming module instead.
The transeivers will pass along any standard x-10 command. You don't HAVE to use the one code that makes the relay snap on/off. I don't hook anything up to the plug on the transeiver, I just use it to forward wireless x-10 commands to the other modules I use.

Hope this helps.

OP | Post 8 made on Sunday September 17, 2000 at 11:07
Tony Blunt
Historic Forum Post
Que, you misunderstand the problem. It is not issuing dim commands to the tranceiver outlet that causes problems, but issuing dim commands to another unit on the tranceiver's housecode. After sending a single dim, many of the TM751s will continue to dim the light to off, and then lock up. They will not work until unplugged and plugged in again.
I have seen a fix proposed on these boards, but not with universal success. I returned a defective unit and recieved a working one back from X10.
OP | Post 9 made on Monday September 18, 2000 at 02:42
Jim Fouch
Historic Forum Post
The endless dim problem with the TM751 is well known and has been discussed extensively in the comp.home.automation newsgroup - some people are able to eliminate or reduce the problem by moving the antenna to a horizontal position or my various aother means that I don't recall (I don't use these devices and try to avoid any device made by X-10 as much as possible) -- for more information, you might want to see [Link:]

Good luck, Jim.

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