NEC VT37 User Manual page 54

3. 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.
Interlock
NOTE: There is an interlock on this case to prevent the risk of electrical shock. Do not attempt to circumvent this interlock.
4. 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 VT70LP.
Order this from your NEC dealer.
Secure it in place with the two screws.
Be sure to tighten the screws.
5. Reattach the lamp cover.
Slip the lamp cover back until it snaps into place.
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6. Maintenance