Mb Board Assembly; Mb-755 Board - Sony MAV-70 Manual

2-5. Boards Replacement

2-5-5. MB Board Assembly

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It is necessary that removing the MB board assembly,
before the AC-188, MB-755 and MB-756 boards are
removed.
1. Disconnect the power cords from the rear panel.
2. Remove the cover. (Refer to Section 2-2-2.)
3. Remove the two screws (BVTT 3x6) on the optional
boards, then remove the all optional boards.
4. Remove the four screws (BVTT 3x6) and SPG-15
board.
Option board
BVTT 3x6
5. Remove the SY-253 board. (Refer to Section 2-5-9.)
6. Remove the PU-102 board. (Refer to Section 2-5-10.)
7. Remove the Fan motor units. (Refer to Section 2-4-4.)
8. Remove the front panel (lower) and ornamental panel
A. (Refer to Section 2-2-1.)
9. Open the front panel A. (Refer to Section 2-4-2.)
10. Remove the power supply units. (Refer to Section 2-4-
2.)
When there is one power supply unit, remove the
blank panel. (Refer to Section 2-5-2.)
11. Remove the all HDD units. (Refer to Section 2-4-3.)
12. Remove the front stay. (Refer to Section 2-5-2.)
13. Remove the two power guides. (Refer to Section 2-5-
2.)
14. Remove the IF positioning bracket. (Refer to Section
2-5-2.)
15. Remove and replace the all IF-678 board. (Refer to
Section 2-5-2.)
2-22 (E)
SPG-15 board
BVTT 3x6
BVTT 3x6
Lever
Lever
16. Remove the four screws (PSW 3x6) and eight screws
(BVTT 3x6), then remove the shield plate.
17. Remove the four screws (BVTT 3x6) and three screws
(PSW 3x6) securing the MB-755 board to the chassis.
BVTT 3x6
BVTT 3x6
18. Disconnect the two connectors (CN1, CN10) of the
harness connected the AC-188 board.
19. Disconnect the connector (CN37) of the harness
connected the MB-756 board.
20. Disconnect the connector (CN323) of the harness
connected the MB-755 board.
21. Remove the six screws (BVTT 3x6), then remove the
MB board assembly in the direction of the arrow.
BVTT 3x6
CN37

MB-755 board

BVTT 3x6
AC-188 board
PSW 3x6
BVTT 3x6
Shield
plate
MB-755 board
MB board assembly
CN323
CN1
CN10
BVTT 3x6
MB-756 board
MAV-70