Service Instructions; What Is Esd; Thermal Switch (Thermostat) Replacement Procedure - ESAB Origo Mig L305 Service Manual

SERVICE INSTRUCTIONS

SERVICE INSTRUCTIONS
CAUTION!
STATIC ELECTRICITY can damage circuit boards and
electronic components.
• Observe precautions for handling electrostatic
sensitive devices.
• Use proper static-proof bags and boxes.

What is ESD?

A sudden transfer or discharge of static electricity from one object to another. ESD stands
for Electrostatic Discharge.
How does ESD damage occur?
ESD can cause damage to sensitive electrical components but is not dangerous to people.
ESD damage occurs when an ungrounded person or object with a static charge comes into
contact with a component or assembly that is grounded. A rapid discharge can occur,
causing damage. This damage can take the form of immediate failure, but it is more likely
that system performance will be affected and the component will fail prematurely.
How do we prevent ESD damage?
ESD damage can be prevented by awareness. If static electricity is prevented from building
up on you or on anything at your work station, then there cannot be any static discharges.
Nonconductive materials (e.g. fabrics), or insulators (e.g. plastics) generate and hold static
charge, so you should not bring unnecessary nonconductive items into the work area. It is
obviously difficult to avoid all such items, so various means are used to drain off any static
discharge from persons to prevent the risk of ESD damage. This is done by simple devices:
wrist straps, connected to ground, and conductive shoes.
Work surfaces, carts and containers must be conductive and grounded. Use only antistatic
packaging materials. Overall, handling of ESD-sensitive devices should be minimized to
prevent damage.

Thermal switch (thermostat) replacement procedure

1. Spare thermostat must be the same type as replaced one.
2. Spare thermostat should be mounted within radius of 10 mm or less from broken
thermostat. If it's possible and safe for transformer winding, broken thermostat may be
removed. Then the spare thermostat is to be mounted right in place of broken one.
3. Spare thermostat should adjoin protected winding as tight as possible.
4. Spare thermostat must be secured with silicone glue of working temperature of 200 °C
or higher.
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