ESAB Origo Mig L3000i Service Manual page 84

8 SERVICE INSTRUCTIONS
Checking the NTC resistors
The NTC resistors that senses the temperature are connected in a resistance network.
3. When the temperature of the diode
module is 20°C, the resistance between
pins 3 and 4 is about 1.8 kohm.
Depending of the temperature of the
module, the resistance may be in the
range of 0.5 to 10 kohm. The treshold
level for overtemperature is 390 ohm.
Both NTC resistors must have the same
resistance value.
4. NTC_R28 is fitted on the cupper foil of
the circuit board. When the temperature
is 20°C, the resistance is about 2.3
kohm.
Depending of the temperature, the
resistance may be in the range of 0.5 to
10 kohm.
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