1) Remove the screws(4) located in the corners of the light table then lift and remove it.
2) Remove the bad lamp by twisting the lamp 1/2 turn and pulling it out of the sockets.
3) Install the new lamp type F6T5/D into the respective sockets and lock in place by twisting 1/2 turn. **See Note
4) Secure the light table window back in place with the screws
**On some older 301's due to changes in the Lamp manufacturing industry current lamps will not fit. Take care not to force and break the holders. If you have a unit where the lamps don't fit it will need to come in for service.