Sony CDX-M750 - Fm/am Compact Disc Player User manual

http://servis-manual.com/

22
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. FRONT PANEL ASSY (NORMAL)
2-2. FRONT PANEL ASSY (INOPERATIVE)
1Turn on the power and open the front panel.
2screw (panel)
stand
3screw (panel)
4front panel assy
(Take care not to
pull the flexible
board excessively.)
flexible board
7Lift the cam (R) assy
slightly to make a play.
4PTT 2.6x6
3PTT 2.6x6
1screw (panel)
flexible board
9
0front panel assy
(Take care not to pull the
flexible board excessively.)
2screw (panel)
8Lift the motor block assy
slightly to make a play.
5PTT 2.6x6
6PTT 2.6x6

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2-3. CD MECHANISM BLOCK, FLEXIBLE BOARD
2-4. SUB PANEL (CD) SUB ASSY
2PTT 2.6x4
4CNP701
1PTT 2.6x6
3PTT 2.6x4
5CD mechanism block
7bracket (CD)
6PTT 2.6x6
8cover (flexible)
0flexible board
9CNP802
Note:When installing
the flexible board,
make the board slack
as illustrated.
3PTT 2.6x6
6sub panel (CD) sub assy 2PTT 2.6 x6
5claw
1CNP805
4claw

24
1PTT 2.6x6
4PTT 2.6x6
5motor block assy
2cam (R) assy
3CNP902
A
Note: Install the cam (R) assy with
the cam fully rotated in the
direction of the arrow A.
2-6. MAIN BOARD
2-5. MOTOR BLOCK ASSY, CAM (R) ASSY
Note : Install the motor block assy and cam (R) assy in this roder.
For phase alignment between cams (L) and (R), see page 29 and 31.
4PTT 2.6x6
ground point
5PTT 2.6x6
ground point
1PTT 2.6x8
6MAIN board
3PTT 2.6x
8
2PTT 2.6x8

25
2-7. HEAT SINK
2-8. CHASSIS (T) SUB ASSY
5heat sink
1PTT 2.6x8
3PTT 2.6x8
4PTT 2.6x
8
2PTT 2.6x12
4chassis (T) sub assy
3P 2x3
2P 2x3
1Unsolder the
lead wires.
black
red
white

26
2-10. SERVO BOARD
2-9. LEVER SECTION
4claws
2DISC IN SW board
7lever (L)
3tension spring (LR)
6lever (R)
5guide (disc)
1special screw
6PS 2x4
1CN3
3Removal the solders.
4P 2x3
5loading motor assy
8SERVO board
2CN2
7PS 2x4

27
Fig. 1
1tension spring (RA)
2arm (roller)
3retaing ring (RA)
4shaft retainer
5shaft roller assy
retaing ring (RA) arm arm
washer washer shaft retainer
shaft retainer
2-11. SHAFT ROLLER ASSY
• When installing, take note of the positions
arm (roller) and washers. (Fig. 1)
2-12. FLOATING BLOCK ASSY
1tension spring (KF1)
7compression spring (FL)
6floating block assy
8compression spring (FL)
4Fit lever (D) in the
direction of the arrow.
2damper (T)
3damper (T)
5Turn loading ring in the
direction of the arrow.

28
2-13. OPTICAL PICK-UP BLOCK
1P 2x3
2sled motor assy
3optical pick-up block

29
cam (L
)
arm (A-L) assy
arm (B-L) assy
C
A
B
3stop ring 1.5, type-E
hole
SECTION 3
PHASE ALIGNMENT
3-1. ARM (A-L) ASSY, ARM (B-L) ASSY
3-2. CAM (L)
1Move the arm (B-L) assy in the direction of the
arrow Aand the arm (A-L) assy in the direction of
the arrow Bfully (full open state).
2Align the hole on the cam (L) with part Cand install
the cam.
4Turn the cam (L) clockwise and counterclockwise to
verify that both the arms are operated.
5stop ring 1.5, type-E
2stop ring 1.5, type-E
3spring (arm L)
1arm (B-L) ass
y
4arm (A-L) assy
bracket (L) assy

30
3-3. MOTOR BLOCK
3-4. ALIGNMENT BETWEEN ARM (A-L) ASSY
AND ARM (B-L) ASSY
1Turn the cam (L) and position the cam so that part A
does not touch the SWITCH board SW900.
1Input 9V DC to the motor terminal until the cam (L)
stops rotating.
Take care to avoid overload of the motor.
2Verify that the arm (A-L) assy and arm (B-L) assy
are positioned as shown below (full open).
3PTT 2.6x6
4PTT 2.6x6
2motor block
SWITCH board
SW900
cam (L
)
5B 2.6x4
A
motor
GND
arm (B-L) assy
arm (A-L) assy
DC 9
V
+B