Wednesday, February 15, 2006

Keep checking C 2154 Board

I replaced the broken relay K1 on R03 module as soon as I got the ordered relay. But I did not monitor the high voltage. We could not detect the firing angle signal from C-2154 board. Mike checked the board again and found pin 7 of A4 mechanically broken. After we replaced the A4 chip, we tried to run the system. This time, we could measure the firing angle, but the high voltage monitor still showed zero. We disconnected the firing angle output on C-2154 board and sent a pulse wiht 3 V, 500 ms to the SCR control unit, then we could see the high voltage monitor worked well. It means the SCR and control unit is okay. So we will continue checking the C-2154 board.

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