Disassembly - Sharp CD-DD4500 Service Manual

CD-DD4500
Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Take cassette tape and compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need to
be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
CD-DD4500
REMOVAL
STEP
1 Top Cabinet 1. Screw ..................... (A1) x4
2 Side Panel 1. Screw ..................... (B1) x8
(Left/Right)
3 CD Player Unit/ 1. Turn on the power supply,
CD Tray Cover
2. Screw ..................... (C1) x1
3. Hook ....................... (C2) x3
4. Hook ....................... (C3) x2
5. Socket .................... (C4) x3 12-2,13-2
4 Dolby PWB 1. Screw ..................... (D1) x5
2. Flat Cable .............. (D2) x2
5 Rear Panel with 1. Screw .................... (E1) x11 12-2,13-2
Fan Motor 2. Socket ..................... (E2) x1
6 Main PWB 1. Screw ..................... (F1) x2 12-2,13-3
2. Flat Cable .............. (F2) x1
3. Socket .................... (F3) x6
7 AMP. A/AMP. B 1. Screw ..................... (G1) x4
PWB with Heat Sink 2. Flat Wire ................. (G2) x1
3. PWB Holder ........... (G3) x2
8 Front Panel 1. Screw ..................... (H1) x3
9 Display PWB 1. Knob ........................ (J1) x1
2. Screw .................... (J2) x13
3. Flat Cable ............... (J3) x1
10 Tape Mechanism 1. Open the cassette holder.
2. Screw...................... (K1) x5
11 Headphones PWB 1. Screw ..................... (L1) x1
12 Turntable 1. Hook ....................... (M1) x2
2. Cover ..................... (M2) x1
13 Disc Tray 1. Turn fully the lock lever in the
2. While holding the lock lever,rotate
3. Push the slide chissis backward to
14 CD Servo PWB 1. Screw ..................... (P1) x1
(Note 2) 2. Hook ....................... (P2) x2
3. Socket .................... (P3) x4
15 CD Mechanism 1. Hook ....................... (Q1) x2
2. Hook ....................... (Q2) x3
Note 1: How to open the changer manually. (Fig. 12-3)
1. In this state, turn fully the lock lever in the arrow direction through
the hole on the loading chassis bottom.
2. While holding the lock lever, rotate the cam gear anticlockwise until the
cam gear rib engages with the clamp lever. (Fig. 13-1)
3. After that, push forward the slide Chissis.

DISASSEMBLY

PROCEDURE
open the disc tray, take out
the CD tray cover, and close.
(Note 1)
arrow direction.
the cam gear until the cam gear
rib engages with the clamp lever.
engage the claw with the groove
and remove it in the direction
of the arrow. ............... (N1) x6
CD-DD4500
(A1) x 2
ø3 x 12mm
Side Panel
(Right)
(B1) x 2
ø3 x 10mm
(B1) x 4
FIGURE
ø3 x 10mm
12-1
12-1
12-2
(C3) x 1
13-2
Pull
13-2
13-3
13-4
Rear
Panel
13-4
(C1) x 1
13-5
ø3 x 10mm
13-5
13-5
13-6
12-3
13-1
14-1
14-2
14-3
Note 2:
1. After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the front end
of the connector so as to protect the optical pickup from electro-
static damage.
Note 3:
1. Be careful not to break the claw of the CD mechanism.
2. When fining back the cam gear assembly, let it lock by front
movement.
– 12 –
Top Cabinet
Rear
Panel
Figure 12-1
CD Servo
CD Tray Cover
PWB
(C4) x 2
1
(E1) x 2
Main PWB
ø3 x 10mm
Figure 12-2
Lock Lever
CD Player Unit
(Bottom View)
Figure 12-3
(A1) x 2
ø3 x 12mm
Side Panel
(Left)
(B1) x 2
ø3 x 10mm
(C2) x 3
1
2
CD Player
Unit
(C3) x 1
Lug Wire
(F1) x 1
ø3 x 10mm