Sony BRAVIA BZ40J 100" Class 4K UHD HDR Commercial Monitor - Manual (Page 287)

Help Guide
Digital 4K Video Camera Recorder
FDR-AX43/AX43A/AX45/AX45A/AX60
A rattling noise is heard when this product is shaken.
If no noise is heard when this product is turned on and is in movie/photo recording mode, the noise is produced by
the movement of the internal lens. This is not a malfunction.
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