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5. Precaution - Important
1) General
You have to take utmost care to follow the general rules and practice for safety in servicing electrical
medical equipment.
2) Power off before servicing
For electrical safety, make sure to disconnect the power cable before opening the cover.
3) Route of electrical wire
Be sure to keep the original routes of the electrical wires and the original positions of the cores.
Otherwise it may break the compatibility with the EMC regulation. You must put the wires back to the
original routes after the maintenance.
4) High temperature on the lamp
Just after turning off the lamp it may be hot. Be careful not to suffer heat injuries when replacing a
lamp or maintain parts around the lamp.
5) Electrostatic Discharge
To avoid the PCBs from getting damaged, wear anti-static protection such as a wristband and
discharge the electrostatic charge before servicing.
6) Disassembling parts
The procedures of disassembling the mechanical and electrical parts are not described in detail in the
service manual. Unless otherwise mentioned, detach from the outer parts to the inner parts or from the
upper parts to the lower parts. In the case a special technique is necessary, it is described. You can
refer to the exploded view pages as well.
7) Optical unit mounting base
It is made of PC+ABS (Polycarbonate, ABS resin) and parts as the lamp rotation disk are held with
self-tapping screws. Thus tightening the self-tapping screw several times may screw up the mounting
base, especially the screw holes in the base. Be careful not to spoil the screw holes by obliquely
screwing the screws. If spoiling the screw hole it is necessary to remove the base with new one.
8) Electrical safety test
Be sure to do the following tests when you did a repair by opening the cove, after putting back all of
the disassembled parts and the cover to the original position. The procedures are described in the
following pages.
a) Dielectric strength test, b) Protective earthing circuit resistance, c) Leakage current tests
