I have a fairly large and powerful ultrasonic cleaner. It holds over a gallon, has a 180 watts of power and it's heated. It would cost over $350 to replace it. Earlier this year I noticed that the increase time button stopped working. Then, just before Coz, all of the buttons stopped working. I had a number of regs and tank valves to rebuild, so the cleaner took a back seat. Now, after the back log has been finished, I got to examining the problem child.
As it turns out, the printed circuit has become de-laminated so that the buttons never get to make contact. By jumping the right pins on the internal circuit board, I can make the machine work. Cool. What's nice is that the pin out is printed right on the circuit board, so there is no guessing. I am going to rewire using two DPDT momentary toggle switches from radio shack for about $20. I will mount them on either side of the panel. They'll have plenty of room, so no worries there. Rather than put in an additional switch to turn the unit on, I am going to wire in the other half of both switches so you have to push them up together to accomplish this. That way, I won't inadvertently turn it off when I am setting controls, and it will frustrate anyone who tries to use my equipment while I am not there.
Oh, yeah... I tried to find a replacement front panel. That would have been simple. This design has been discontinued and they do not have any parts to repair them. Arrrrrgh. They think I could buy another panel and make it work. They only want $127.00 plus shipping for it with no guarantee that it will fit or be suitable. I'm just going to wire in the two switches.
As it turns out, the printed circuit has become de-laminated so that the buttons never get to make contact. By jumping the right pins on the internal circuit board, I can make the machine work. Cool. What's nice is that the pin out is printed right on the circuit board, so there is no guessing. I am going to rewire using two DPDT momentary toggle switches from radio shack for about $20. I will mount them on either side of the panel. They'll have plenty of room, so no worries there. Rather than put in an additional switch to turn the unit on, I am going to wire in the other half of both switches so you have to push them up together to accomplish this. That way, I won't inadvertently turn it off when I am setting controls, and it will frustrate anyone who tries to use my equipment while I am not there.
Oh, yeah... I tried to find a replacement front panel. That would have been simple. This design has been discontinued and they do not have any parts to repair them. Arrrrrgh. They think I could buy another panel and make it work. They only want $127.00 plus shipping for it with no guarantee that it will fit or be suitable. I'm just going to wire in the two switches.
