DV-720H (serv.man22). Deassembly and Reassembly of MainParts - Sharp DVD Service Manual (repair manual). Page 2

<Take out disk>

1. Remove the top cabinet.
2. It is in such cases as the thin driver, and it is pushed in slowly, and a tray is drawn in the arrow direction the slide rack on the

left of the base chassis.

3. Take out disk.

Front Side

<Disassembling and assembling the mechanism chassis>

1. Remove the four base chassis mounting screws.
2. Remove the loading motor lead wire and sled motor lead wire from the main PWB.
3. To protect the pickup against breakage by static electricity, turn the base chassis over with the pickup FFC connected and short-

circuit (solder) the short land of the superposition PWB.

4. Remove the pickup FFC from the main PWB.
5. Remove the pickup FFC from the superposition PWB.
6. Remove the traverse mounting screws to remove the traverse chassis ass'y.
Note: After assembly and wiring, remove the solder joint of the short land. If short-circuited, a disk is not played back.

1. Remove the pickup FPC and loading relay FFC  A  from the main PWB.

Note: Fit the conductive rubber cap to the front end of pickup FPC (short-circuit).

2. Remove the solder joint of loading relay PWB at drive unit rear side.

1

Sled motor lead wire (Yellow·Orange)

2

IN SW lead wire 2 (White)

3

Spindle motor lead wire (Red·Black)

4

Loading motor lead wire (Red·Black)

5

Remove each lead wire from the claw.

3. Remove the relay PWB mounting screw  B  (M2.6S + 6S S tight),

and remove the relay PWB  C .

Sled Motor Lead Wire

Pickup FFC

Traverse Fixing Screw

Loading Motor Lead Wire

Superposition PWB

Pickup FFC

Short Land

<Replacing the pickup and the spindle motor>

Since the pickup optical axis and turntable inclination of DVD are adjusted with higher accuracy than of CD/MD, make a replacement
as a mechanism service chassis ass'y (refer to Parts List).