SOURCE: unlock keypad on lt240 projector
If you do not know the password, then NEC can unlock the keypad after you show proof of ownership by providing the purchase receipt. Other than that it only be resolved by taking the projector to an authorized service repair center with the purchase receipt. This is the safety feature NEC employs to ensure they are providing service for the owner and to deter theft. It is a frustrating and expensive process but well worth knowing that if a projector is ever stolen, the projector basically is locked from use. Expect to pay over $200 to unlock the keypad if you take it to a repair center.
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