Why not to balance an amp: The amp is not responsible for maintaining location. If the slide is not repeating start with tests relating to location such as Ctrl-H and Ctrl-C.

Before balancing the amps perform the Ctrl-E test. This will tell if the amp needs to be balanced - See Below.

When replacing an MC2 card or 12V power supply it is necessary to rebalance the MC2 card first, then the amps. If the MC2 card is out of balance you will will not be able to use the BALANCE pot on the amp to bring the at rest number to 0.

The act of balancing an amp is just that: BALANCING. The amp is in a loop with its motor. If you understand what is going on, then the balancing of the amp should be easier and we won’t get back so many good amps tagged NFG.

Adjustments with servos off

Before turning servos on, connect a Digital Volt Meter to pins X axis (4 -black & 5 -brown ) or Z axis (4-Blue & 5-Green) on the brown connector of the Amp. Set the Motion Card offset voltage to 0V (+-.002V) using the balance pots on the side of the MC2 Card (from left to right, X-Balance Pot, Z-Balance Pot ). See photos below for location of pots on MC2 card (from left to right, X-Balance Pot, Z-Balance Pot ). See photos below for location of pots on MC2 card.

Before you start with the amps:

· The LOOP GAIN pot should be at full CW and left there (20 turns).

· The CURRENT LIMIT should be full CWand left there.

· If the axes are vibrating at all (whistling) turn the COMP pot CWuntil there is no vibration. And then continue for 2 more turns.

Tuning Amps:

In the jog mode. Press Ctrl and E.

Turn the balance pot so that both the x and z numbers are close to 0 (within one or 2).

Press 2 for jog speed 2.

While jogging the slide at 2 speed turn the Tach pot so that the number for the corresponding axis reads no more than 160. -
-If the number stops at 125 the amp is tuned and this pot should be turned back to 100.
-If the number will not go to at least 125 the signal pot needs to be turned up.

Next while jogging at the same speed in either direction turn the Signal pot so that the number for the corresponding axis reads 125.

Now still jogging that same axis in either direction turn the Tach pot so that the number for the corresponding axis reads 100.

After those adjustments are made it may be necessary to adjust the Balance back to 0.