77C Max I can get for heatbed?

[mikes3ds]

The power to the heat bed turns off around 77c

What do you think the cause is? Is it software, transistor (If it is what should I buy or do), solider job or something else?

Info:
1. I have a pretty crappy soldier job on the heatbed for the main connectors, with a 14 (or 16?) gauge wire a foot long.
2. Also I fan directly blowing on the transistor with a heatsink on it; however, with out that the fan on it only gets up to 44c.
3. 12v 30a Dc Power Supply.


Board
http://www.aliexpress.com/item/32-bit-A ... 51240.html

Power Supply
12v 30a Dc Universal Regulated Switching Power Supply 360w for CCTV, Radio, Computer Project
http://www.amazon.com/gp/product/B00D7C ... detailpage

[teoman]

Check the wires comin outh of the rambo to the heated bed.

Last time that happened to me the connector on the rambo had fried.

[teoman]

Check that no components on the controller boards are hot.

[mikes3ds]

The Transistor with a heat sink was really really hot (And the capacitors around it were hot); so I put a fan directly on it. (Seemed to keep everything cool)

I don't have rambo board, I am using a AZSMZ (A knock off of the Smoothie board)

[teoman]

It seems like it is not up to the task. And it is doing a thermal shutdown.


Try to slow the procedure down.


Put a towel on the heated bed and decrease the pid max value.

[mikes3ds]

Thank you I will give that a try.