SAFETY INFORMATION
General guide
1.Observe the original circuit during maintenance. if short
circuit occurs, change the over-hot or damaged components.
2.Observe all the protective device after maintenance, such
as whether the shielding cover or paper is assembled well.
3.To avoid electric shock, please inspect electricity leakage
after maintenance
Low zeta potential leaking inspection
1.Take out AC cord and connect a piece of wire between two
legs of the outlet.
2.Use Gear R x 10K of the voltmeter to measure the spares
on AC outlet and exposed metallic part with short circuit.
The resistance between screw cap, control shaft should be
unlimited.
Ω
uF
AC voltage table
to have discover metal
accessory of equipment
creepage checking circuit
col d wat er
canal
（
ear t hi ng
）
picture 1
High zeta potential leakage inspection
.As illustrated 1, Connect Resistor with 1.5K, 10W and
capacitor 0.15 between exposed metallic part and device of
fine connection to the earth (water pipe etc.).
2.Plug-in AC cord directly to AC outlet. Do not inspect with
shield adaptor.
3.Utilize 1000 or more sensitive voltmeter to measure
alternating voltage.
4.Turn back the AC plug-in from AC outlet then iterate the
inspection as above.
5.Inspect the voltage of the resistor between other exposed
metallic parts and the earth with the same way.
6. The voltage must not be over than 0.75Vrms at any points
on the resistor. Electric leakage should not be over 0.5mA
when processing high voltage leakage testing through
Device avoiding ES(Electric Susceptible)
Influence of ESD (Electric Susceptible Discharge
exceeded the restrained figure, electric shock should be
possibly suffered. Do maintain the unit and inspect once
more before return to the user.
Device avoiding ES influence of ESD.
Some solid semi-conductor devices are easy to be
damaged by static electricity. These devices are generally
called ES device. The typical devices are IC, field effect
component and semi-conductor laser diode.
The following technology helps to abate the danger of
ESD on body before handle any semi-conductor or
semi-conductor component. Or wear the ESD bangle availed
from the market to eliminate the threaten of static electricity
on human body.
2.Put the electronic parts with ES device on the surface of
conductor such as aluminum foil after take them out in order
to protect static electricity from accumulation and explosion.
3.Solder or disassemble ES device through iron connecting
the earth.
4. Utilize device only anti-static electricity to disassemble
soldering tin. Non-anti static electricity device (ESC
protection) will release ES that damage ES device.
5.Do not use chemical volatile releasing static electricity
that leads to damage ES device
6. Unless preparation for pre-assembling has been made, do
not take out the ES device to be changed from the protective
packing ( most of the changed ES devices are packed
together with anti-static electrical foam or similar electric
material, besides, countermeasures for down-lead short
circuit are taken.).
7. Protective material should connect the model or the circuit
component to be assembled in it before taking out the
protective material from the ES device.
Note: do not bear electricity to the model or the circuit, and
pay attention to all the other safety information.
8. When disassembling and replacing the ES device, try to
reduce body movement (Or, the movement of legs, the
friction of fibrous of clothes, or elevating the legs from the
floor will generate static electricity ESD, causing damage to
the ES device.).
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