Hi I am having a problem with the temperature reading for the hotend on the Printrbot. The printrbot uses a derivative of the Teensylu board. I disconnected the hotend wires from the board, then I used pronterface to read the temperature, and it said it was 157 C. I connected the hotend, which was totally cold, and it gave me close to the same reading. This just started happening today. I have been printing fine before this. Do I have a dead board or is there something else at work here?
I also tested resistors R9 and R10 which are the pull up resistors for the thermistor pins. I measured across them, in circuit, and got around 2K on one, and 6 K on the other. They are supposed to be 4.7 K resistors. I can understand the 2 K one, since there might be other stuff in parallel, but I am pretty sure the other should not be 6 K, since it has to be below 4.7K.
