Q.The power source cover was unnecessary. Is it OK to use the product with the cover removed? (On the other hand, the cover was necessary. Are cover sold separately?)

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A. Please do not remove the cover by yourself.
If you remove the cover, you will be outside the scope of warranty and no longer covered by the safety standard.
Similarly, please do not modify or disassemble the product.
If you purchased the product by mistake, please contact your TDK Lambda agent from which you made the purchase. Do not attempt to make any modifications yourself.

Also, covers are not sold separately.
Similar to as discussed above, please contact your TDK Lambda agent from which you made the purchase. Do not attempt to make any modifications yourself.