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View Full Version : Tandon floppy drive heats up



musicforlife
March 24th, 2018, 03:35 PM
Is it normal for Tandon floppy drive that what seems to be passive cooler (piece of metal) in the backside is getting so hot that I can't keep finger on it?

Chuck(G)
March 24th, 2018, 08:11 PM
What's the piece of metal in question? is it the heat sink for the TO220 power transistor on the tach board? If the drive isn't spinning, it shouldn't get hot at all.

musicforlife
March 25th, 2018, 05:35 AM
What's the piece of metal in question? is it the heat sink for the TO220 power transistor on the tach board? If the drive isn't spinning, it shouldn't get hot at all.

Yeah, heatsink (I forgot the name). In my drives the component on heatsink is "TIP110".

Chuck(G)
March 25th, 2018, 11:07 AM
If the drives operate, I wouldn't worry about it. If something has a heatsink on it, it's going to get hot. The "TIP110" is a darlington power transistor--a commodity item. The Tandon uses a sort of analog loop to control motor speed, which means that the TIP110 acts as a power resistor--and the heat's got to go somewhere. More modern drives use pulse-width-modulation, which aren't nearly as inefficient.