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Maintenance; Maintenance Instructions; Introduction; Antistatic Precautions - Hitachi LM-C300S/P Quick Reference Manual

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To get maximum performance from the laser marking system and avoid damage, it is very important to
perform preventive maintenance an all components.
A maintenance plan for all the components should always be established, and the working level and
characteristics of the surface of the product to be marked must be considered.
It is very important that the electrical power of the system be shut down before any maintenance
procedure, to prevent any hazardous exposure to laser emissions.
This chapter contains the Maintenance Procedures, which describe how to test and repair LM-C300 S/P
laser systems and how to install new options.
The following Maintenance Instructions are provided for use by Hitachi trained and authorized service
technicians. The first instructions are the "Scheduled Maintenance" procedures, which describe the
maintenance required at the recommended intervals.
The remaining instructions describe different tasks to maintain the laser system. For example,: replacing
parts in the new laser system. Some of the instructions are also mentioned in the instructions of the
"Maintenance Schedule", and performed during this maintenance task.


The PCBs in Hitachi laser systems use some electrostatic-sensitive components that can be severely
damaged if these components receive a static discharge. Static electricity, which is generated on a
person through friction and movement, is discharged through the first route to ground that is contacted.
Damage caused by a static discharge is not always immediately detected after the static discharge has
occurred, and can cause component failure in the future. It is very important that service technicians use
the following antistatic recommendations when touching PCBs:
An antistatic wrist strap must be worn, which includes a resistive component (greater than
The antistatic wrist strap must be connected to a good ground point. The continuity of the
antistatic wrist strap and the ground point must be checked regularly.
Always hold a PCB by its edge do not touch the components or printed circuit tracks. After a
PCB is removed from the laser system or its packaging, the PCB must be put on a static
dissipative mat.
Always use antistatic packaging when PCBs and software components are shipped or moved
between locations. All Hitachi PCBs are stored in antistatic bags. These bags must always be
reused for transport.