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Post by jamirie on Jan 1, 2013 19:49:44 GMT -5
Step 1: I did already Still get 0,15V... Step 2: that's curious- when the one resistor leg is desoldered from PCB, it gives 5V on both sides! So really seems a tracing issue, right?
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Post by airtripper on Jan 1, 2013 21:25:51 GMT -5
Do a continuity test on traces that run close to the T0 trace between the resistor and the A13 pin. Have the + probe on the resister pad and use the other probe to test other pads that have traces next to the T0 trace. This is to find out if the T0 trace is connected to another trace that it shouldn't be.
Include In the test while + probe is on the resistor pad: Test both pins on the T1 connector. Test the T0 ground pin. Test the pins on the ramps board that plug into the arduino mega A12 and A14
Use the ramps schematic to find pads for testing with traces that run close or across the T0 trace.
All the best for the New Year.
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Post by jamirie on Jan 2, 2013 6:54:38 GMT -5
Happy new year 2013! So i soldered the resistor back in and tested the traces around this pin- there seems to be an issue -see attatched Pic please. The two pads which are marked red and shown with an arrow shouldn't have connectivity (if i got the schematics right ) When i tested other pins (that should be connected) with the conductivity feature of my Multimeter, they show about "0,02", but when connect the 2 marked pads my multimeter shows around "1956". Thats weird somehow.... even though they shouldn't be connected. Attachments:
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Post by airtripper on Jan 2, 2013 9:18:55 GMT -5
Looks like the probes might be shorting through the resistor. The + probe should be on the pads where you confirmed 0.15v. In the picture you have a probe on the wrong side of the resistor.
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Post by jamirie on Jan 2, 2013 9:21:02 GMT -5
Yes, i know, but there shouldn't even be a connection between these pads, right?
So no issue here?
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Post by airtripper on Jan 2, 2013 9:59:48 GMT -5
There should not be a connection. The only connection to ground is through the thermistor when it is connected.
The only thing you can do now is to visually check the whole of the T0 trace to find the short.
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Post by jamirie on Jan 3, 2013 8:19:20 GMT -5
hmm, so i visually checked the traces- but can't find any issues. So i think i will buy a new RAMPS Board, but can't find a seller near me who's selling the 1.3 Version. All sellers just have the 1.4 Version? Is it possible to use a RAMPS 1.4 instead? kind regards and many,many thanks for your assistance! i appreciated it
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Post by airtripper on Jan 3, 2013 9:49:05 GMT -5
If you cannot find the short, you can isolate the T0 trace by removing the capacitor and resister and the A13 pin.
You can now change the pin assignment for T0 in firmware. You can change the code so that T2 on the ramps board is the new T0. That means you will now be using T2 as the hot end thermistor connector.
Find the following code in the pins.h file in the firmware starting at line 297:
#define TEMP_0_PIN 13 // ANALOG NUMBERING #define TEMP_1_PIN 15 // ANALOG NUMBERING #define TEMP_2_PIN -1 // ANALOG NUMBERING #define HEATER_BED_PIN 8 // BED #define TEMP_BED_PIN 14 // ANALOG NUMBERING
And change it to the following:
#define TEMP_0_PIN 15 // 13 // ANALOG NUMBERING #define TEMP_1_PIN -1 // 15 // ANALOG NUMBERING #define TEMP_2_PIN -1 // ANALOG NUMBERING #define HEATER_BED_PIN 8 // BED #define TEMP_BED_PIN 14 // ANALOG NUMBERING
To test it, connect the thermistor to T2 and see what you get after connecting the usb.
I believe the ramps 1.4 is ramps 1.3 but with some surface mount components and extra capacitors. Getting the ramps 1.4 should not make any difference to your current set-up.
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Post by jamirie on Jan 3, 2013 13:17:36 GMT -5
AIRTRIPPER YOU ARE MY GOD It shows 023/000°C so everything seems fine as far as i can tell by now Yeay!!!! I will reassemble it and get back to report the news - Thank you sooooooo much Mark!!! Without your endurance assistance i wouldnt even make it anyway.... Great! THXTHXTHXTHXTHXTHX
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Post by jamirie on Jan 3, 2013 15:21:38 GMT -5
So i reassembled it in the meanwhile, checked all connections - but the endstops won't work... even though the Stepper Motor control in Pronterface (used 250000 Baud) seem to contorol my axis randomly.
For Example, when i click on Z+ it should go down to the endstop- when first clicking it, it does so. I clicked it a few times more and somehow Z+ seems to suddenly be Z- cause it goes up instead of down to the endstop.
What could be wrong with it? May i missed to change something in the Firmware?
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Post by airtripper on Jan 3, 2013 17:30:51 GMT -5
The firmware is expecting the endstop be connected to the Z+ connector on ramps while the other endstops are connected to X- and Y-. Are X and Y behaving oddly as well?
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Post by jamirie on Jan 3, 2013 18:56:39 GMT -5
Yes the endstop pins seem to be connected right, does it matter which polarity they have?
When i travel any of the axis one time, it will move. But when i trigger them two or three times they won't even move... But when i home Y, it will move in the false direction... Homing Z and X will move the right way and stop as soon as the endstop is triggered. Hmmm....
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Post by airtripper on Jan 3, 2013 19:26:35 GMT -5
Rotate the connector for the Y axis, that should correct it. Make sure the power is switched off though.
So, the axis will not move correctly after homing?
Polarity do not matter for these end stops.
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Post by jamirie on Jan 3, 2013 19:39:15 GMT -5
In the meanwhile we managed to change it in the Firmware. So now all axis will move Next: Check the extruder - but there's no fan button in Pronterface, we didn't even find a working manual for configuring a custom button for the fan. May you know how to enable the fan in Pronterface?
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Post by jamirie on Jan 3, 2013 20:40:23 GMT -5
With M106 it'll work, but how to get a button?
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