Daikin ERQ - Method of Replacing the Inverters Power Transistors Modules

ESIE09-05 Method of Replacing the Inverter’s Power Transistors Modules
Appendix 235
6. Method of Replacing the Inverter’s Power
Transistors Modules
Checking failures in power semiconductors mounted on inverter PC board
Check the power semiconductors mounted on the inverter PC board by the use of a multiple
tester.
<Items to be prepared>
• Multiple tester : Prepare the digital type of multiple tester with diode check function.
<Preparation>
• Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement
of resistance.
• To make measurement, disconnect all connectors and terminals.
ERQ 100/125/140 A7V1B
C–
C+
W
U
V
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