2230-30-1 power supplies do not turn on!

I already three DC Power Supplies(2230-30-1).
In my case, I bought the power supplies in South Korea but I moved the supplies from South Korea to USA.
So, I changed fuse (6.3A, 260V).
However, the power supplies do not turn on....

Do you have any ideas as to what the problem may be?

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Tektronix/Keithley Repair/Calibration:
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Email: rmarequest@tektronix.com

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