Some little progress
I removed the voltage regulator and get now a clean 4.98V when the board is completely empty. I Also removed the pololus which I hadnt done before and found that one of them was causing the drop in voltage to 4.3V and got hot while the 3 other only the it drop to 4.6V.
So I left only the three good ones on the board and plugged in a motor and actually connected to pronterface without brownouts. I also tested with the bad one and got my brownout back. So it seems there is one bad driver is influencing the whole board.
However marlin is still reporting an "external reset" the motor doesnt move and the extruder thermistor shows very weird values. It gives me a permanent 122C. I checked the config but they are still set to 1 (100k). The bed thermistor works normal
So it looks like the printer is in some sort of purgatory where it connects and is then resetted at once with only some function working properly.
I also checked the capacitors but they are generally rated for 50V and I see no damage.
With Sprinter as firmware I dont get resets, but except for the bed thermistor nothing else works.
Playing around with the different pololus, thermistor motor and endstop combiations still gives me below 4.8V in general.
I removed the voltage regulator and get now a clean 4.98V when the board is completely empty. I Also removed the pololus which I hadnt done before and found that one of them was causing the drop in voltage to 4.3V and got hot while the 3 other only the it drop to 4.6V.
So I left only the three good ones on the board and plugged in a motor and actually connected to pronterface without brownouts. I also tested with the bad one and got my brownout back. So it seems there is one bad driver is influencing the whole board.
However marlin is still reporting an "external reset" the motor doesnt move and the extruder thermistor shows very weird values. It gives me a permanent 122C. I checked the config but they are still set to 1 (100k). The bed thermistor works normal
Quote
Connecting...
start
Printer is now online.
echo: External Reset
Marlin1.0.0
echo: Last Updated: Jun 21 2014 07:28:56 | Author: (none, default config)
Compiled: Jun 21 2014
echo: Free Memory: 13445 PlannerBufferBytes: 1232
echo:Hardcoded Default Settings Loaded
echo:Steps per unit: etc..
So it looks like the printer is in some sort of purgatory where it connects and is then resetted at once with only some function working properly.
I also checked the capacitors but they are generally rated for 50V and I see no damage.
With Sprinter as firmware I dont get resets, but except for the bed thermistor nothing else works.
Playing around with the different pololus, thermistor motor and endstop combiations still gives me below 4.8V in general.