The subject device was returned to olympus¿s local distributor, but not returned to omsc.In the evaluation of the omsc the following was confirmed on information from the local distributor, there was no key tone on the front panel due to defective electrical board.Serial no:(b)(4) (date of manufacture: may 31th, 2018).Repair history: no repair history found for the past year.The local distributor confirmed malfunction of the electrical board.As a result of the dhr review, it was confirmed that there was no abnormality in manufacturing, concession, and variation.No repair history found for the past year.The electrical board controls light adjustment, lamp, communication between otv-s190, and front panel.Therefore, omsc assumed that accidental malfunction of parts on the electrical board caused defective electrical board, led to defective front panel or unstable control signal with otv-s190, no key tone resulted.
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