Discussion Category: PCR / Thermal Cyclers
Tracing down Power Error Masteracycler Gradient
I have an Eppendorf Masteracycler Gradient 5331. It shows "Power ERR"
I've traced it down to no input on the octocoupler on the power board that turns on the 28v peltier board.
The signal for the octocoupler comes from the larger board through pin 4 on the ribbon cable to the octocoupler.
That traces back to an NPN fet. I get no signal.
At startup there is a signal for about 5 seconds then it shuts down.
Does anyone have any input to save me hours in reverse engineering. It seems like a bad clamp circuit, pull down resistor or something.
Any help would be greatly appreciated.
Thank you.