Replacing The Mb-1073 Board - Sony HDCU3300 Maintenance Manual

2-1-8. Replacing the MB-1073 Board

1. Remove the rear panel.
(Refer to steps 1 to 8 of Section 2-1-4.)
2. Remove all the plug-in boards.
(Refer to step 2 of Section 2-1-7.)
3. Pull out the HIF-25 board, three HIF-27 boards, SDI-
86G board, SDI-85 board and CN-2674G board in the
direction of the arrow.
MB-1073
board
HIF-25 board
4. Remove the screw that fixes the VIF stopper.
5. Disconnect the two flexible card wires from connec-
tors CN8 and CN9 on the CNB-21G board and pull out
the VIF-34G board in the direction of the arrow.
6. Disconnect the flexible card wire from connector CN7
on the CNB-21G board, and pull out the ADO-10G
board in the direction of the arrow.
n
Life of flexible card wire will be significantly short-
ened if it is folded. Be very careful not to fold the
flexible card wire.
CN9
MB-1073
board
CN8
CN7
Flexible card
wire (50 core)
ADO-10G
board
HDCU3300/MM (J, E)
CN-2674G
board
SDI-86G board
HIF-27 boards
SDI-85 board
CNB-21G board
VIF-34G board
CN4
VIF stopper
Harness B
Screw
(B3 x 5)
Flexible card
wires (50 core)
7. Remove the three screws and remove the rear board
fixing plate.
8. Disconnect the harness (DC fan: Rear) from the
connector CN34 on the MB-1073 board.
Harness
CN34
(MB-1073 board)
Rear board
fixing plate
9. Remove the power supply unit.
(Refer to steps 1 to 5 of Section 2-1-1.)
10. Remove the four rivets. While removing the harness
(DC fan: Rear), remove the cable cover in the direction
of the arrow.
11. Disconnect the harness from the connectors CN31 and
CN32 on the MB-1073 board.
CN31/
MB-1073 board
CN32/
MB-1073 board
Cable cover
Harness
(DC fan: Rear)
Screws
(B3 x 5)
Four nylon
rivets
Cable cover
2-11 (E)