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(2) Checking Method for Inverter PCB (Driver Board)
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Detail of Check Points
CAUTION
!
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Check whether the high voltage still exists in the inverter PCB after power is disconnected. When the unit
is operated, LED7 is turned ON. At the time of powering off the unit, LED7 is turned OFF. In this case, the
residual voltage is less than DC50V.
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If LED7 is turned ON while powering off the unit, please wait for about ten minutes, LED7 will turn OFF.
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APFC Circuit of Driver Board (In case of using Digital Tester)
Rectier and Inverter Circuit of Driver Board. Remove all the terminals of the driver board before check. If all
the items (below table) are performed and all items are satised, the driver board is non-defective.
Test Point
Digital Tester Result
+ side of tester -Side of tester
DCL2 R/S/T Over Load (OL)
R/S/T DCL2 0.5V or smaller
R/S/T CN28(N) Over Load (OL)
CN28(N) R/S/T 0.5V or smaller
TROUBLESHOOTING
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