VIORE PDP4210EA Service Manual page 112

4. Trouble shooting.
How to check IPM
◎
Forward : test 1 GND(＋) , Sus-out(－)
2 Sus-out(＋),Vs(－)
3 ER-DN(－),ER-COM(＋)
4 ER-COM(－),ER-UP(＋)
when each 4 TEST Diode value is over 0.4V => OK
Reverse : test 1 GND(－) , Sus-out(＋)
2 Sus-out(－),Vs(＋)
3 ER-DN(＋),ER-COM(－)
4 ER-COM(＋),ER-UP(－)
when each 4 nodes TEST Diode value is infinity => OK
※ Specially, the value of ER-UP,COM,DN in the Y/Z board, should be
checked all of them. but, the terminal of Vs,Sus-out,GND,
we must aware to know after check one of IPM because it is parallel.
if no problems, check 15V(Y,Z B/D) with GND,
Reverse value infinite. If no problems,
40 /40
Forward value 0.3V,