Andy Twose
- Feb 16, 2016
- 13
- Joined
- Feb 16, 2016
- Messages
- 13
Hi,
I am tasked with repairing a Tecmix TM1100 paddle mixer. This is a 2 handled device used for mixed plaster and building materials.
The problem is that it runs at full speed.
I have remove the speed controller, which unfortunately is encapsulated in a hard resin.
As suspected the connections out to the motor are short circuit and these connections can be traced back to the large heat sink'd semiconductor device. I have called it that because therein lies my problem....it is not marked.
It is a TO220 package or similar.
I am guessing it is a Triac but would like confirmation of this, or suggestions of what else it might be.
Please see the attached image.
Only 2 slide connectors are connected to the motor, one is free and not used.
The 3 white cables go off to the handle to another PCB holding just the manual control which is a 500k pot.
The best I can work out for the component count on the encapsulated board appears to be :-
Small potentiometer
Single capacitor
2 x resistors
Triac or whatever it is
Something else, small, maybe a diode
Apologies for being so vague but the encapsulation is very black and very hard.
I do have access to the solder side of the PCB so it should be possible to sketch out the circuit.
It is conceivable that something else has blown, too, but I'll worry about that once I know what I am dealing with.
Any help appreciated.
Thanks
I am tasked with repairing a Tecmix TM1100 paddle mixer. This is a 2 handled device used for mixed plaster and building materials.
The problem is that it runs at full speed.
I have remove the speed controller, which unfortunately is encapsulated in a hard resin.
As suspected the connections out to the motor are short circuit and these connections can be traced back to the large heat sink'd semiconductor device. I have called it that because therein lies my problem....it is not marked.
It is a TO220 package or similar.
I am guessing it is a Triac but would like confirmation of this, or suggestions of what else it might be.
Please see the attached image.
Only 2 slide connectors are connected to the motor, one is free and not used.
The 3 white cables go off to the handle to another PCB holding just the manual control which is a 500k pot.
The best I can work out for the component count on the encapsulated board appears to be :-
Small potentiometer
Single capacitor
2 x resistors
Triac or whatever it is
Something else, small, maybe a diode
Apologies for being so vague but the encapsulation is very black and very hard.
I do have access to the solder side of the PCB so it should be possible to sketch out the circuit.
It is conceivable that something else has blown, too, but I'll worry about that once I know what I am dealing with.
Any help appreciated.
Thanks