1

Hi all, I have made myself a new HBP to replace the one on my CTC printer
New HBP as 4 wires coming out of the mat (130watt) 2 are for power +,-
and 2 for the Thermistor (Item is this http://www.ebay.co.uk/itm/2813982211…%3AMEBIDX%3AIT)
The old HBP as 6 wires coming from it 2 For the power for heat and then there are 4 other wires labled Sig, Gng, Gnd and 5v.
Does some one know how to connect it up please?

Need help please

2

The thermistor connects into the red on the right hand side of the connector and the other wire goes into the yellow wire on the connector and the power to the mat goes to the ground on the left and the 12v next to it on the far left of the connector

3

Sorry for the crude drawing but that’s where to connect the wires to i just happen to be replacing the thermistor on my heated bed so it reads the correct temperature and the other two wires are just the power the led to tell you the bed is on that’s why there are resistors

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4

Thanks for the reply’s guys. I have tried the red and yellow but when I turn on the printer the read out reads 118. Ambient temp is around 21. The led is not connected to the remaining 2 wires, it is connected in the 24v side of the bed. Pic off board uploaded and a drawing to clarify the connections.

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5

Yes I just got my thermistor and your using the wrong one I just ordered mine as a 100k thermistor is wrong you need a 47kohm or a 50kohm I will tell you tomorrow when they arrived I measured the stock thermistor at 54 k ohms and the nozzles where at 22 and bed at 35 so I’m reckoning that a 50kohm will do it

6

Ok so I need a 50kohm thermistor not a 100? Or do I need to add a resistor?

7

Yes or I think adding a 50k resistor would work I’ll be able to tell you in a few hours whea they come

8

Hi buddy, how did you get on?

I have been trying resistors between the 5v and sig. at around 5-6ohz. I am some where near at low temp’s but when the temp goes up it all changes. will do some more investigating when I get time. Let me know how you are getting on!

9

I got them delivered next day forgot to reply but when I put a 50k in the sig and Gnd the printer read 122° and room temp was 22 and extruders were 22 so I’d say soldering a 47k to the board would read 22 as the resistors on the board get rid of that 100° if not just get an external temp controller and run it of that im a bit disappointed they made it this hard

10

Food for thought I have a couple of pid controlers laying around from my bga machine

11

It is dead strange though as I got the same thermistor of ebay a glass with straight legs like the one on the bottom 50k and a 47k and when I plug it into the board it reads 122 for the 47 and 134 for the 50 so soldering it to the board might do the trick but honestly wiring a 100k to the board and having it run of a controller would be a lot easier

12

The origanal board as a cap aswell as a resistor solderd to it

13

It might be worth trying soldering them to the board I’ll do it in a few as I’m waiting in more deliveries