Electrostatic Protection Measures; Grounding For Prevention Of Electrostatic Damage; Cautions When Handling Optical Pickup - Hitachi DZMV380EAU Service Manual

Safety Precaution for Repair > Electrostatic Protection Measures

1-3 Electrostatic Protection Measures

Semiconductor components, including optical pickups, may be damaged by static electricity charged
on clothes, human body, etc. Take great care when handling it to avoid electrostatic damage.

1-3-1 Grounding for prevention of electrostatic damage

Perform servicing in an environment where grounding is complete.
Grounding work bench (Fig. 1-3-1)
1) Lay out a conductive material (conductive sheet) or iron plate under the work bench on which
semiconductor components, such as optical pickups, are placed to ground the bench.
Grounding human body (Fig. 1-3-2)
1) Use an anti-static wrist strap to discharge static electricity charged on human body. Note,
however, that static electricity charged on clothes will not be discharged by anti-static wrist
strap: Be careful that your clothes do not touch the semiconductor components, such as optical
pickups.
Conductive material (conductive sheet)
or iron plate
Fig. 1-3-1 Grounding work bench
1-3-2 Cautions when handling optical pickup - only for DVD products
1) The optical pickup has a high precision structure: Do not subject it to any impact.
2) Do not perform disassembly further than that described in this manual.
3) Never turn the semi-variable resistors in drive unit block.
Anti-static wrist strap
Ground
1 - 4
Fig. 1-3-2 Grounding human body
1M ohm