HE280 reading DEF after install on v2

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noname117
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HE280 reading DEF after install on v2

Post by noname117 » Mon Feb 11, 2019 2:31 am

So I just installed a HE280 on my v2 and installed the firmware. However, whenever I switch on the printer, the screen briefly shows something around -2 deg on the hot end then goes to def. Double checked the wiring, and soldering on the accelerometer pcb and it all looks good. Anybody know why the hot end thermistor isn't reading?

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geneb
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Re: HE280 reading DEF after install on v2

Post by geneb » Mon Feb 11, 2019 8:21 am

There's a wiring issue with the thermistor. Check to make sure that the whip connector is fully seated in the HE280 PCB and that all the pins are fully seated in that connector as well as the connectors on the other end.

g.
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Re: HE280 reading DEF after install on v2

Post by noname117 » Mon Feb 11, 2019 8:12 pm

geneb wrote:
Mon Feb 11, 2019 8:21 am
There's a wiring issue with the thermistor. Check to make sure that the whip connector is fully seated in the HE280 PCB and that all the pins are fully seated in that connector as well as the connectors on the other end.

g.
Double checked the wires again and even ran new wires from the pcb to the start of the whip but its still reading def.

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Re: HE280 reading DEF after install on v2

Post by geneb » Tue Feb 12, 2019 9:51 am

There's a wiring issue or the thermistor is bad. You can check the thermistor by measuring its connection point on the PCB with a multimeter. It should read around 100k-ish at room temperature.

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Re: HE280 reading DEF after install on v2

Post by noname117 » Tue Feb 12, 2019 10:06 pm

geneb wrote:
Tue Feb 12, 2019 9:51 am
There's a wiring issue or the thermistor is bad. You can check the thermistor by measuring its connection point on the PCB with a multimeter. It should read around 100k-ish at room temperature.

g.
So I measured everything. Across the thermistor wires going to the accelerometer pcb, it read about 14 v at .02 a and no resistance. Across the green and white wires plugged into T0 on the Rambo, it read about 5 v with no current or resistance.

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Re: HE280 reading DEF after install on v2

Post by geneb » Wed Feb 13, 2019 7:45 am

A thermistor is a resistor that changes resistance with temperature. Testing it's condition by measuring voltage going through it is like measuring the diameter of a car tire by checking the internal pressure. ;)

Don't test the thermistor with the RAMBo powered up, or with the thermistor connected to it. If it's connected to the RAMBo, you'll never get a good reading.

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Re: HE280 reading DEF after install on v2

Post by noname117 » Wed Feb 13, 2019 11:40 am

geneb wrote:
Wed Feb 13, 2019 7:45 am
A thermistor is a resistor that changes resistance with temperature. Testing it's condition by measuring voltage going through it is like measuring the diameter of a car tire by checking the internal pressure. ;)

Don't test the thermistor with the RAMBo powered up, or with the thermistor connected to it. If it's connected to the RAMBo, you'll never get a good reading.

g.
Tested the resistor again and it read about .715 k across the thermistor leads.

Tested another glass thermistor i had and it read about 179k. Looks like im replacing a thermistor.

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Re: HE280 reading DEF after install on v2

Post by noname117 » Wed Feb 13, 2019 3:30 pm

noname117 wrote:
Wed Feb 13, 2019 11:40 am
geneb wrote:
Wed Feb 13, 2019 7:45 am
A thermistor is a resistor that changes resistance with temperature. Testing it's condition by measuring voltage going through it is like measuring the diameter of a car tire by checking the internal pressure. ;)

Don't test the thermistor with the RAMBo powered up, or with the thermistor connected to it. If it's connected to the RAMBo, you'll never get a good reading.

g.
Tested the resistor again and it read about .715 k across the thermistor leads.

Tested another glass thermistor i had and it read about 179k. Looks like im replacing a thermistor.
Wired a new thermistor in but its still reading -3 deg on start up before cutting to def. The thermistor reads about 135 k on the multimeter

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Re: HE280 reading DEF after install on v2

Post by geneb » Thu Feb 14, 2019 9:05 am

You might want to contact support at this point. I don't have any other suggestions, sorry.

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Re: HE280 reading DEF after install on v2

Post by Doug68 » Tue Feb 19, 2019 9:40 pm

Is this the revision with or without the thermal fuse? If it is check that and check that the circuit through the heater is not open circuit.
Also check the resistances from the solder on the board in case of a dry join, the thermistor wires are so small that may be an issue.
Also I ruined a board by pulling the track off of the board during re-soldering so don't be a gorilla like me.

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