Hitachi IJ UX Service Manual page 29

3 Measure TP12 of the EZJ125 board with an oscilloscope and make sure it is
within the range of DC250V ± 15V.
For the position of the board and test pins, refer to "3.3.6 EZJ125 board."
[Waveform of charge voltage confirmation]
Charge voltage
← GND level
When confirmation is completed, press Abort and you can stop work before 3 minutes elapse.
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