No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 19, 2015 11:36PM |
Registered: 8 years ago Posts: 23 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 19, 2015 11:43PM |
Registered: 8 years ago Posts: 23 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 19, 2015 11:51PM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 12:09AM |
Registered: 8 years ago Posts: 23 |
Quote
Dust
"I'm not getting any 12 voltage from 11A on the D8+ and D10+"
where exactly are you putting the probes?
Firstly... D8 is powered from the 11amp circuit, but D9 and D10 are powered from the 5 amp circuit
Secondly the mosfets switch the ground lines to allow current to flow.
So if you put the ground probe on either the 11amp or the 5amp -ve (gnd) pin and the positive probe on the D8 + pin, you should always have 12v
Same with gnd and D9 + pin and gnd and D10 + (if your not seeing this check your power supply and the poly fuses)
"I get 12 voltage from 11A to D8- and D10-'
If this is from the 11amp -ve to the D8- or D10- you shouldn’t be getting voltage here.. If you are... something is very wrong.
(I suspect you re using 11a + as your gnd probe, and thus all readings are backwards.)
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 12:53AM |
Registered: 8 years ago Posts: 23 |
Quote
So if you put the ground probe on either the 11amp or the 5amp -ve (gnd) pin and the positive probe on the D8 + pin, you should always have 12v
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 12:57AM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:16AM |
Registered: 8 years ago Posts: 23 |
Quote
Dust
You can rule out the polyfuses
no, if your -ve probe is on a gnd, then you should see no voltage on D8- D9- D10-
type 33 is ramps and defines what pins are used for the hotend and bed and fan (must be an old firmware though to still be using numbers)
now stick the probes in D8 negative probe in - and positive probe in +, it should read 0v
Turn on the bed in software (with no bed connected) ie send command "M140 S55" (set temp to 55c)
Does the meter now read 12v?
Did the led2 turn on? (behind D8 plug is a mosfet, behind that is the led)
repeat for D10 and led4 (second led in from the corner above D10 plug
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:20AM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:26AM |
Registered: 8 years ago Posts: 23 |
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Dust
you where to quick...
"NB If controller returns the error "Printer stopped due to errors. Fix the error and use M999 to restart!" all mosfets get disabled.
Oh I just read back, you are getting this error... you cant test the mosfets till this is fixed
Switch you meter to ohms, unplug the thermister from the ramps, stick the probes (any order) into the thermister plugs one per wire and take a reading
Should be about 100K."
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:35AM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:38AM |
Registered: 8 years ago Posts: 23 |
Quote
Dust
Does you meter read 1 with the probes not touching anything
Sounds like your thermistor wires or thermistor are disconnected somewhere. Check you wiring. Its really easy for the wire on the thermistor to break off
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:53AM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 01:59AM |
Registered: 8 years ago Posts: 23 |
Quote
Dust
thats not possible..
are you sure the probes are touching the metal in the thermistor plugs?
A thermistor is just a resistor that changes value is a predictable way as the temperature changes...
you should be able to read a resistance
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 20, 2015 03:08AM |
Admin Registered: 13 years ago Posts: 7,008 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 21, 2015 07:19PM |
Registered: 8 years ago Posts: 3 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 21, 2015 07:29PM |
Registered: 8 years ago Posts: 23 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 21, 2015 07:51PM |
Registered: 8 years ago Posts: 23 |
Quote
bryanbdp
I am having a similar problem. My extruder heater and fan work, but the bed heater does not.
The LED for the bed heater does flash very weakly, almost too little to see, but not enough ground is available to turn on my SSR controlling the heated bed.
As I understand it, the pin D8 from Mega should normally be pulled low, but go to 12v to trigger the mosfet, is this correct?
I'm not positive how to test the mosfet and Mega board pin.
Is it possible to burn out one pin on the Mega?
Best way to test the mosfet?
Thanks,
Bryan
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 21, 2015 08:38PM |
Registered: 8 years ago Posts: 23 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 28, 2015 06:46PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting December 04, 2015 11:14PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting December 05, 2015 12:51AM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting December 05, 2015 10:26PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting December 05, 2015 10:39PM |
Registered: 8 years ago Posts: 23 |
Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting December 20, 2015 11:14PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting January 01, 2016 06:47PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting November 01, 2017 12:48PM |
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Re: No power to D8+ and D10+ RAMPS 1.4 Marlin. Need help troubleshooting September 14, 2020 07:33AM |
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