Panasonic SA-HT845EE Service Manual ▷ View online
10 Handling Precautions for Optical Pickup Unit
The laser diode in the optical pickup unit may break down due to static electricity of clothes or human body. Special care must be
taken avoid to electrostatic breakdown when servicing and handling the laser diode.
taken avoid to electrostatic breakdown when servicing and handling the laser diode.
10.1. Cautions to Be Taken in Handling the Optical Pickup Unit
The laser diode in the optical pickup unit may be damaged due to electrostatic discharge generating from clothes or human body.
Special care must be taken avoid to electrostatic discharge damage when servicing the laser diode.
1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.
2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed should
Special care must be taken avoid to electrostatic discharge damage when servicing the laser diode.
1. Do not give a considerable shock to the optical pickup unit as it has an extremely high-precise structure.
2. To prevent the laser diode from the electrostatic discharge damage, the flexible cable of the optical pickup unit removed should
be short-circuited with a short pin or a clip.
3. The flexible cable may be cut off if an excessive force is applied to it. Use with caution when handling the flexible cable.
4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible
4. The antistatic FPC is connected to the new optical pickup unit. After replacing the optical pickup unit and connecting the flexible
cable, cut off the antistatic FPC.
10.2. Cautions to Be Taken When Replacing the Optical Pickup
The flexible cable of the optical pickup unit which was supplied as a component is equipped with a short clip to prevent the laser
diode from being damaged due to electrostatic discharge. Remove the short clip before connecting the flexible cable and make
sure that the short land is open. (If the flexible cable is short-circuited, remove the solder.)
diode from being damaged due to electrostatic discharge. Remove the short clip before connecting the flexible cable and make
sure that the short land is open. (If the flexible cable is short-circuited, remove the solder.)
10.3. Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup (laser diode) and the optical pickup will be damaged by static
electricity in the working environment. Proceed servicing works under the working environment where grounding works is
completed.
electricity in the working environment. Proceed servicing works under the working environment where grounding works is
completed.
10.3.1. Worktable grounding
1. Put a conductive material (sheet) or iron sheet on the area where the optical pickup is placed, and ground the sheet.
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10.3.2. Human body grounding
1. Use the anti-static wrist strap to discharge the static electricity form your body.
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Some chassis components may have sharp edges.
Be careful when disassembling and servicing.
Be careful when disassembling and servicing.
11 Disassembly and Main Component Replacement
Procedure
“ATTENTION SERVICER”
1. This section describes procedures for checking the operation of the major printed circuit boards and replacing the
main components.
2. For assembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
3. Select items from the following index when checks or replacement are required.
· Disassembling the Top Cabinet
· Disassembling the Lid assembly (When taking out disc manually)
· Disassembling the Front Panel
· Disassembling the FL P.C.B., Volume P.C.B and MIC P.C.B.
· Disassembling the Mechanism Unit
· Disassembling the DVD Module P.C.B
· Disassembling the Rear panel
· Disassembling the Scart P.C.B.
· Disassembling the Main.P.C.B.
· Disassembling the Top Cabinet
· Disassembling the Lid assembly (When taking out disc manually)
· Disassembling the Front Panel
· Disassembling the FL P.C.B., Volume P.C.B and MIC P.C.B.
· Disassembling the Mechanism Unit
· Disassembling the DVD Module P.C.B
· Disassembling the Rear panel
· Disassembling the Scart P.C.B.
· Disassembling the Main.P.C.B.
11.1. Disassembly Procedure
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11.2. Main Components and P.C.B. Locations.
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