Sony DTC 75ES DAT recorder cassette Dr closes automatically just 2-3 sec after opening without you pressing close door

[VFET747]

hi everyone , I have a Sony DAT cassette recorder model DTC 75ES it has developed a problem in tape ejection process : when you press open tape compartment it opens normally but before you can remove or load a casette within 2-3 second of opening it closes automatically on it own without one pressing close button . I have tested all. Mechanical switches related to the door mechanism opening closes sensing two everything Checks out OK , I think the fault might be on the electronic side on circuit board or IC which controls the tape open/close sequence but I don’t know the correct way to go about trouble shooting electronically . Did someone of you had the same problem and what might be causing the problem. I will be very grateful for any help to solve this problem. Thanks