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Post by jkelly22 on May 27, 2024 2:07:32 GMT -5
I have a LakeShore Model 336 at one of my customer locations. All of the sudden we had the 4A Fuse Blow, changed out to a new one and blew again. After doing some troubleshooting I found after unplugging all Connections from the transformer, the fuse would not blow, so u started plugging in each connector one at a time to see what path was causing the fuse to blow. Once the connection at J7 on the power board was plugged in the fuse would blow. I checked the some of the in-line caps and seem all to be in good order, no visual signs of any SMT components burnt or broken. Has this issue been seen before and what may be the possible cause for this to be occurring?
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Post by Lake Shore Jeff M on May 28, 2024 7:19:55 GMT -5
The connection to J7 produces a Raw 70V output used for the powered outputs 1 & 2. It also has an overvoltage protection circuit that could have damaged components if a voltage surge was experienced. A component failure in either heater output or in the overvoltage protection circuit could be why the fuse is blowing.
I suggest you contact us at support@lakeshore.com so we can arrange a RMA to bring the controller back for a repair.
When contacting us, please provide the serial number of the Model 336 plus your contact name, phone number and shipping address so was can set up the RMA.
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