Electronics > Repair
Voltage Increase, failed component?
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fzabkar:
There appears to be a 14-pin IC between the micro and the two stepper controllers. What is that IC?
ajp8868:
It's an op-amp but can't remember the exact chip type/markings. I've swapped this chip from a working unit but it didn't change anything.
ajp8868:

--- Quote from: fzabkar on July 27, 2024, 04:51:37 pm ---You say that you have been swapping chips. Which chips have you swapped?

--- End quote ---

Sorry I missed this question, so far I've swapped the TL7226 DAC and the Op-amp

I've also swapped the LED driver, but actually I've removed it from this board since I shorted a pin and blew it up..
fzabkar:
If you select PAN or TILT functions from the menu, does the light behave as if it is responding to the command even though it isn't moving? In other words, does the MCU think that the light is moving even though it isn't? If you remove one of the stepper controller ICs, does the MCU complain?

How does the unit know when a stepper motor has reached end-of-travel? Does it simply count the steps, or is there some positional feedback? Limit switches? How many wires are there for each motor?
ajp8868:
There are no errors shown and it behaves as normal with the controllers or without.

There is a limit switch on the pan and a limiting reed switch on the tilt. No positional feedback on these units
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