Is there an easy way to check the bridge rectifiers?

With the power to the machine off, connect the red lead of the digital multi tester set to the diode test function to a terminal number 39 on the machine. Connect the black lead to the following wire terminals one at a time, #11 and #20 for the X axis rectifier, #13 and #21 are for Y, #15 and #22 for Z . The meter should read .5 to .7 between terminal 39 and each of the above wires. You have just checked the negative half of the bridge rectifiers.