Hi all,
I have a TVM 802A, which was working fine so far, with all limitations of this low cost PnP. By the way, the worse part of it is the feeder, which is a pain in the ass. Some days ago, while it was working on a small production batch, it started having a very strange behavior. It's impossible to home the head and while positive and negative limits are detected, I cannot even manual move the head in some directions. Please watch the video
https://youtu.be/CucdKt0oZNE. I contacted the support of the company and I got this reply:"Hi sir, It seems the wire of the motor is broken.It needs to be replaced." It's well known that in this machine there is only one motor and only one wire. When I asked again of which motor, I've been told that it's the X axis motor, which by the way, as it can be seen in the video, if the head reaches the negative limit, it works fine. I've checked all wires with a multimeter and everything is well connected. It's well known that the price to pay for a cheap Chinese machine, is the absence of after-sales support.
All motors and limit switches, under certain conditions work fine and thus I suppose that the problem is related to firmware corruption or fault. Unless someone else was having the same problem and a solution, I suppose that the only alternative is to buy another PnP, staying away from Chinese no supported products. After all, in the end, you end up paying much more for the "low cost" products.