NEC NP3151W - Manual (Page 142)

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7. Maintenance
2. Loosen the two screws securing the lamp housing until the phillips screwdriver goes into a freewheeling
condition. The two screws are not removable.
Remove the lamp housing by holding it.
NOTE: There is an interlock on this case to prevent the risk of electrical shock. Do not attempt to circumvent this interlock.
3. Insert a new lamp housing until the lamp housing is plugged into the socket.
CAUTION
Do not use a lamp other than the NEC replacement lamp NP06LP.
Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
interlock