E1 always on (after possible shortage)
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@facet said in Extruder always on (after possible shortage):
So is the MOSFET gone
if only it goes on without SD card and its only E1 then yes, 99%. (If it was bed+e0+e1 it could also be the mosfet driver)
@facet said in Extruder always on (after possible shortage):
Which one is to replace for E1?
part no AOD4184A
google "multimeter test mosfet" if you have a meter you can use diode test function to check the mosfet. (lengthy instructions and plenty of good guides on google)
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Thank you for the fast answer!
It is going on with and without SD card!
So makes this a difference??I will check how to meassure the mosfest and dont burn anything else additionally..
BR
facet -
@facet said in E1 always on (after possible shortage):
It is going on with and without SD card!
So makes this a difference??Not normally, but removing the SD card from the equation means we can ignore the possibility of incorrect configuration on the card, triggers or whatnot.
Measure with power off and heater disconnected - its only the mosfet you want to measure a few different ways, google is easier than explaining.
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Thank you very much.
Can anything else get damage while using the Duet in this state till the new mosfets arrive?BR
facet -
@facet said in E1 always on (after possible shortage):
Can anything else get damage while using the Duet in this state till the new mosfets arrive?
Unlikely, but #MurpyhsLaw. Disconnect the heater and it should be fine unless you short something against the heater output.
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@facet said in E1 always on (after possible shortage):
Thank you very much.
Can anything else get damage while using the Duet in this state till the new mosfets arrive?If you disconnect the heater, then nothing else should get damaged.
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Hi,
So i will disconnect the LED strips from E1 and can continue printing (if i got it right with disconnect the heater you mean the LED strip from E1 which is used for) meanwhile the spareparts arrive.
But first i need to check which one is damaged...Thank you!
BR
facetP.S.: My first Thread in this forum, long time just reading. I am impressed with the response time, amazing!
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@facet said in E1 always on (after possible shortage):
Hi,
So i will disconnect the LED strips from E1 and can continue printing (if i got it right with disconnect the heater you mean the LED strip from E1 which is used for) meanwhile the spareparts arrive.
Yes, disconnect whatever is connected to the output that is stuck on.
P.S.: My first Thread in this forum, long time just reading. I am impressed with the response time, amazing!
Thank you!
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@facet said in E1 always on (after possible shortage):
But first i need to check which one is damaged...
its labeled TR8 on the board, closest to the corner.
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Changing TR8 Mosfet did the trick... now i can switch E1 again on and off.
This was a tricky one, used my heating gun with a small adapter (8mm) the first time for soldering and re-used a heatsink metal sheet from a defect DDR2 RAM to protect the other stuff on the duet around the mosfet
(slightly modified 
)So thank you very much for the help!
Last question: Why can this happen because i thought because of the fuses that a short on E1/E0 is not causing an issue?! - nevertheless i was not careless but not concentrated enough.BR
facet -
@facet said in E1 always on (after possible shortage):
Why can this happen because i thought because of the fuses that a short on E1/E0 is not causing an issue?!
Unfortunately semiconductors can blow faster than relatively slow fuses. The fuse will protect against prolonged overloading but not always against shorts.
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As @bearer says. The fuse should protect the PCB and prevent the wiring catching fire if there is a prolonged short.
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Thank you.
So wired everything again and now E1 is on again all the time. Omg..
Good thing is, i ordered 5 spare mosfets... -
Ok, now it is getting strange.
After i changed yesterday the mosfet and without connecting any cables the LED was going on and off with my macro.
Now after wiring up everything the LED from E1 is always on and i am meassuring 15,4V output on E1. After i enable E1 i get the full 24V.So i think i messed up something else with changing the mosfet?!
Also now the chamber fan goes on when i activate E1 (Leds). So i added my config - but strange because this was working before.
Without SD Cards the E1 LED also in on, so i think something is broken.BR
facetCONFIG:
; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Sun Jul 07 2019 17:41:47 GMT+0200 (Mitteleuropäische Sommerzeit); General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder movesM667 S1 ; Select CoreXY mode
; Network
-deleted-; Drives
M569 P0 S1 F8 Y03:00 ; Y01:02 Physical drive 0 goes forwards F8 Y03:00
M569 P1 S1 F8 Y03:00 ; Physical drive 1 goes forwards
M569 P2 S1 F8 Y03:00 ; Physical drive 2 goes forwards
M569 P3 S1 F8 Y03:00 ; Physical drive 3 goes forwards
M569 P4 S1 F8 Y03:00 ; Physical drive 4 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X160 Y160 Z802.00 E405.00 ; steps per mm (bei 128 Steps 644 644)
M566 X1200.00 Y1200.00 Z12.00 E120 ; Set maximum instantaneous speed changes (mm/min) XY900 E120.00
M203 X36000.00 Y36000.00 Z900.00 E3000.00 ; Set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z120.00 E4000.00 ; Set accelerations (mm/s^2)
M906 X700.00 Y700.00 Z550.00 E1000.00 I5 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X245 Y230 Z240 S0 ; Set axis maxima; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops
M574 Z1 S1 ; Set active high endstops; Z-Probe
M558 P0 H5 F120 T1800 ; Disable Z probe but set dive height, probe speed and travel speed
M557 X15:200 Y15:195 S20 ; Define mesh grid; Heaters
M305 P0 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S125 ; Set temperature limit for heater 0 to 125C
M305 P1 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S270 ; Set temperature limit for heater 1 to 270C
M307 H1 A379.3, C142.5, D8.5 V24.0 B0
; Chamber Thermistor
M141 H3 ; heater 3 is the chamber heater
M305 P3 X2 R4700 T100000 B3950 ; heater 3 is monitored by a thermistor;LED Strip on E1
M307 H2 A-1 C-1 D-1 ; Disable heater on the pin; Fans
M106 P1 S1 I0 F500 H1 T50 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H3 T30 ;Chamber Fan controller by H3 thermistor; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C; Automatic saving after power loss is not enabled
; Custom settings are not configured
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Hm, measure the frequency of the 15.4v if your meter allows? (and see if it matches the pwm frequency for E1?)
Although, sounds like there is a short in your wiring, i'd start there.
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Yeah, thank you. I disconnected the E1 cables and now the LED is off and the Chamber fan works as supposed...
Only thing is, if i meassure output from E1 when deactivated my DM shows ~10MV. On E0 nothing (0,00).I am going through my wiring and keep you updated
Thanks.
BR
facet
