repairing viper drives.

[najnielkp]

i have been using viper drives for 3 years now with no problems. had a encoder fail and a runaway x axis. toasted that drive. ordered new from larken and up and running again . a question about the dead drive .the viper manual states that they are easily repairable. are the mosfets the component that need replacement?

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[Larken]

If its a Rev 2 (green) pcb then usually its just one of the 2 upper mosfets and also replace the drivers (IR2104).
( If its an older (yellow pcb) than it may be more . )

You have to be careful when removing mosfets, you don't damage the PCB. Don't use a solder sucker ! It loosens traces.

Put the soldering iron on 2 legs at a time, and twist it out each side at a time as your heating it. Then tap the board on the table to remove solder filling the holes.

I've got a circuit for a simple MOSFET tester that i will post.

Larry

BTW, Any companies drive can be blown by a number of different ways. There is No such thing as a bullet proof drive (just search these forums). I made my drives repairable just so the customer doesn't loose his investment when Sh#t happens (lol) (maybe years down the road).

There is a servo drive comparison review on the web that says "Larken wouldn't have made his drives repairable if they didn't blow" , but he fails to mention that my drive didn't blow, unlike 3 others he tested that did !

[najnielkp]

thanks for the tips Larry. i repaired 1 of the drives. however 2 others appear more damaged than the mosfets. can i send them to you for repair?
about the guy that was rating drives. seemed to be pissed at you about something. maybe could not get a freebie?

[Larken]

Yes, send it back and i will update and repair it.
Larry