1

Shutdown the system.

2

Remove the knurled screw on the top.

3

Slide the FPD top cover borad then remove it.

4

Slowly pull the photomultiplier unit out horizontally to remove it.

5

Remove the 2 setscrews of the photomultiplier socket.

6

Detach the photomultiplier socket fixing plate.

7

Hold the photomultiplier socket and pull the photomultiplier out slowly.

8

Holding the base of the photomultiplier, pull it out slowly from the socket.

Replace the O-ring of the socket if it has deteriorated.

Photomultiplier socket O-ring 036-11031

9

Check that the O-ring in the opening (the filter attachment unit) of the photomultiplier case has not deteriorated.

Replace it if it has deteriorated.

O-ring for the photomultiplier opening 036-11018

10

Insert the new photomultiplier into the socket.

11

Insert the photomultiplier slowly into the photomultiplier case.

12

Attach the photomultiplier socket fixing plate and fix in place using the 2 screws.

13

Put back the photomultiplier unit slowly.

14

Put back the top cover board and slide it to adjust the screw position.

15

Tighten the knurled screw with pulling the board to the left so that it fits on the photomultiplier unit.

16

Start up the system.

Note:
The cover board (P/N : 221-71795-91) has been modified since Apr. 2006 product (the previous model was in the shape of a flat borad).