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Hi , I`m Jack Perhaps I can help you with this problem
This 3 blinks code indicates that either the lamp is not seated properly or the door is not securely closed .
There are 2 switches that monitors this and either will give you that 3 blinks code but most often it is the door switch that causes the problem .
So much so that at some point sony was suggesting defeating them and stopped installing them in its later models.
Now what i would suggest is to pull the lamp out and back in again and double check that the lamp door is closed securely
Let me know how that goes