Check the voltage at CN122-12 on the main board.
0V 24V
Replace the main board.
Check the voltage at CN122-9 on the main board.
0V 24V
Replace the main board.
Check the voltage at CN122-14 on the main board.
24V 0V
Replace the main board.
Replace the ac drive board.
1 December 1990
6-44
