2-11
EO18-33003A
2. MAJOR UNIT REPLACEMENT
2.5 REPLACING THE HEAD CONTROL PC BOARD (FOR THE B-452-HS
MODEL)
1) Open the top cover. (Refer to Section 2.1.)
2) Remove the two PT-3x10 screws to detach the top cover. (Refer to Section 2.1.)
3) Disconnect the harness and flat cable from CN1 and CN2 on the head control PC board, respectively.
NOTE: When re-connecting the flat cable, be careful of the terminal orientation.
4) Detach the head control PC board from the three locking supports that secure it to the CPU PC board.
2.5 REPLACING THE HEAD CONTROL PC BOARD (FOR THE B-452-HS MODEL)
5) Disconnect the harness from CN3 on the head control PC board.
6) Replace the head control PC board with a new one, and then reassemble in the reverse order of
removal.
Fig. 2-17
Fig. 2-18
Locking Support
Flat Cable
Harness
CN1
CN2
CN3
Head Control PC
Board
Locking Support
