[Rakounet]

Hi Scott,
Curious... I do not see any 25 ohm resistor. Pins 11 and 14 of TB6560 are grounded with 2 x R51 in parallel (= 0.25 ohms) for a 2A intensity. Are you sure to not confuse. Otherwise, send a picture. The smoke near the connector may be comes from these resistors. Check if there is no short circuit (PCB, wiring...).

Rak

[Kahjo]

Hello,

I've just bought 3040 CNC with this T-D 3 axis controller. I'm not getting any response from the controller and I'm suspecting it might have faulty power supply or something.

If I power up only the controller itself and pull up the E-stop, should the cooling fan behind the box start spinning ?

Thank you.

[sli21]

hi rak
there is no resistor in the circuit you are correct but when i put meter across pins 2 and 4 (not 1&3 - i made mistake) i get reading of 25ohms. also reading from pin 2 to ground = 10ohms and pin 4 to ground is 28ohms.
i do not get any readings on other axis only x-axis.
i checked the resistors you mentioned and they seemed OK - 0.5ohms and in parallel - 0.25ohms.
could not see any soldering issues except pin7 on the db25 connector. see picture.
also ther eis some discolouration around pin14 on the chip. you can just see in poicture. maybe this part of issue
otherwise nothing obvious
thanks for your help

scott

[sli21]

hi kahjo
the fan should start. did you check the fuses on the small circuit board inbox. unplug from power point and open box. some people have blown fuses withthis controller.
there is a picture of circuit further down in this post.
if you find blown fuses unplug 24v red and black power plug that goes from the fused circuitboard to the to the large circuitboard. insert new fuses and turn on. maybe light up and spindle works.. if you reconnect 24v power plug and turn on again maybe fuse blow. if that the case then issue with controllerboard. this like my problem.
let us know how you go!
cheers scott

[Kahjo]

Thanks for the quick and informative reply.

I will further discuss with the seller before opening the box. I checked the fuse just below the power plug, it was intact.

Cheers

[Rakounet]

Hi Scott,
The discoloration around pin 14 seems to be a crack. Is it? Scrape with your nail to check. In this case the IC is burned.

The measures you have done are with the board totally deconnected or not? If not, redo these measures without any connection.

And let me know the results.

Rak

[sli21]

hi rak
i think you are right. i thought the mark just look like something that maybe had stuck onto chip -bit of plastic or something. but i think it is cracked like u suggest.
i took the measurements with the board disconnected.
i think i will replace the chip.
is there any mods i should make while i am at it?
cheers scott

[Rakounet]

Hi Scott,

The measures with the disconnected board confirm that I suppected. Be careful to remove the chip. May be you could cut all the pins first, then unsolder them one by one.

The first mod to be done is to add the capacitors as indicated in another thread (post #12): http://www.cnczone.com/forums/chines...ing-steps.html

Check also the wiring before reconnecting the board to prevent any short circuit, e.g. in the connectors of motors.

Rak

[sli21]

Thanks rak
Can u tell what the motor outputs are on that board? Which pin is which? Someone has been playing around with it . Maybe a picture
Regards scott

[Rakounet]

Here is my board without the additional capacitors:
Attachment 236940
Disconnet the 4-pins motor plug and check there is no short circuit between yellow and green wires.
For information : yellow to yellow = 1 phase (pins 9 & 12 on TB6560), green to green = the other phase (pin 13 & 16 on TB6560).
The motors must be connected to their respective plug on the controller rear panel.
Also, herewith some reasons leadind the IC to smoke or burst :
Attachment 236944
Hope it can help you.
Rak

[sli21]

Thanks rak
What is the difference between capacitors this size? I have 1uf, 0.1uf, or 0.047 ceramic caps. Any of these ok? I can order .47uf if need to. What is the difference in operatin. Thanks for all your help
Regards scott

[Rakounet]

Hi Scott,
You can use 1uF (at least 63V)
Regards,
Rak

[crafter2u]

is the schematic on the left a pwm?