Electrostatic Protection Measures; Grounding For Prevention Of Electrostatic Damage; Cautions When Handling Optical Pickup - Hitachi DZ-MV350A Service Manual

Safety Precaution for Repair > Electrostatic Protection Measures

1-3 Electrostatic Protection Measures

The laser diode in optical pickup block 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
1) Lay out a conductive material (conductive sheet) or iron plate under the work bench on which
optical pickups are placed to ground the bench.
Grounding human body
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 optical pickups.
Anti-static wrist strap

1-3-2 Cautions when handling optical pickup

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.
Conductive material (conductive sheet)
or iron plate
1M ohm
1 - 4
Ground