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Author Topic: Can’t get Probe to Work  (Read 9329 times)

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Offline stirling

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Re: Can’t get Probe to Work
« Reply #30 on: March 02, 2016, 11:15:47 AM »
Setting my voltmeter at 20VDC scale I get 0.65 between the tool bracket and the touch plate. I get Nothing between the tool chuck and the touch plate

I've just re-read this. Remember what I said earlier about doing what I asked and not what you fancied?

Where did I say test between the tool BRACKET and touch plate? Then WHERE did I say test between the tool CHUCK and the touch plate?

You've (hopefully) clipped the clip to the TOOL - yes? - so test between the TOOL and the touch plate please.

Then please test between the actual screw on input15 and the actual screw on the power connector GROUND.

Offline kolias

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Re: Can’t get Probe to Work
« Reply #31 on: March 02, 2016, 11:22:54 AM »
The clip is a small alligator clip and can only clip it to the head of a screw around the router mounting bracket. I will attach a wire on the clip and wrap it around the tool and the test between the tool and the bracket

Then I will test between the pin 15 and the GND where the black wire is connected. Will take me 10 minutes
Nicolas

Offline stirling

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Re: Can’t get Probe to Work
« Reply #32 on: March 02, 2016, 11:32:08 AM »
The clip is a small alligator clip and can only clip it to the head of a screw around the router mounting bracket.

Jeeze Kolias - you could have mentioned this before.

Offline kolias

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Re: Can’t get Probe to Work
« Reply #33 on: March 02, 2016, 11:35:32 AM »
Between the tool and plate now I get 0.51 and between pin 15 and GND I get 0.55.
Nicolas

Offline kolias

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Re: Can’t get Probe to Work
« Reply #34 on: March 02, 2016, 11:44:09 AM »
Sorry stirling for my mistakes, I know it is very frustrating and I thank you for your patience
Nicolas

Offline stirling

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Re: Can’t get Probe to Work
« Reply #35 on: March 02, 2016, 11:47:22 AM »
between pin 15 and GND I get 0.55.

Then pin15 is STILL being pulled to GROUND by the internal pull DOWN. This should NOT be happening because the 120 ohm resistor between pin15 and 5V should be stronger and thus pull UP to around 4.8V.

You effectively have pin15 at the centre tap of a potential divider of 120/4K7. That just HAS to give a reading of 4.8V between 15 and GROUND. If it doesn't then either the manual is wrong, your board is screwed, or physics doesn't apply in your neck of the woods.

The only thing I can suggest as a last try is to connect the resistor DIRECTLY between 5V and pin15 and then measure between GROUND and pin15.

In fact - while you're at it - can you also check the voltage between the 5V screw and GROUND screw?

Also - are you absolutely sure that resistor is 120 ohms?

Offline kolias

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Re: Can’t get Probe to Work
« Reply #36 on: March 02, 2016, 11:55:54 AM »
I will do what you say stirling, about the 120 Ohms resitor have no idea but the store clerk gave me a pack of 5 - it is blue color with black brown red stripes. I also have 10K, 1, 3.1, 3.3, 1K, 220 and 33 Ohms resistors if any of them is better
Nicolas

Offline kolias

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Re: Can’t get Probe to Work
« Reply #37 on: March 02, 2016, 12:28:39 PM »
Connect the resistor between 5V and pin 15. Volts between GND and pin 15 = 0.47

Volts between GND and 5V = 4.8 to 5.14
Nicolas

Offline stirling

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Re: Can’t get Probe to Work
« Reply #38 on: March 02, 2016, 12:49:05 PM »
first one is madness - second one sounds right.

re: your colour bands - those colours aren't correct for 120 but leave that for now...

OK - gotta go now - but you could try this just to establish the pin is working:

1) remove the resistor and the red and black wires completely.
2) with pin 15 set to active low - you should see the digitize LED on the diagnostics page lit.
3) Now change active low to active high (red cross) - you should now see the LED UN-lit.
4) now connect a wire directly between 5V and pin15. You should see the LED lit again.

Offline kolias

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Re: Can’t get Probe to Work
« Reply #39 on: March 02, 2016, 01:29:30 PM »
1) Resistor and black / red wires removed
2) pin 15 set to active low (green), LED is lit
3) Change to active high (red), LED is Un-lit
4) connect wire directly between 5V and pin 15, LED is lit again

Let me know stirling when you get a chance what's next
Nicolas