JCM Part No . 960 - 000102R _ Rev . 2 © 2006, JCM - American Corporation 3 - 4 Section 3 Optipay™CC Design from JCM and simply exchanged in the assembly (See Figure 3 - 6 [ 1 ] ) . Firmware may require an upgrade depending on the cassette con - figuration . This can be accomplished in the field with the use of a Palm Pilot ® handheld device con - taining the appropriate application software . Payout Module Change is dispensed by two motors installed at the bottom of the Payout Set (See Figure 3 - 1 [ 7 ] ) . The left motor is responsible for dispensing coins from the left “ Tube L ( 5 )” and middle left “ Tube ML ( 4 )” coin tubes, and the right motor is responsi - ble for dispensing coins from the right “ Tube R ( 2 )” and middle right “ Tube MR ( 3 )” coin tubes . Filling Level Sensors The coin level in each tube is monitored by four sets of independent sensors: •   An empty sensor is positioned at the height of 8 to 10 coins •   A 50% sensor is located approximately half way up the cassette •   A 75% sensor is located near the top •   A full sensor is positioned at the top rim of each tube . In order for the tube counters to work correctly, the tubes have to be filled by inserting coins through the Coin Validator . If the cassette is removed to fill or remove coins from it, the coin count recorded by the counters would be inaccurate . In this case, the Coin Changer uses the coin thickness and level sensors to recalculate the correct amount of coins in the tubes . If a tubes "full" sensor displays the message " Tube Full ", all further coins for this tube will be auto - matically directed to the Cash Box . Only when coins have been dispensed again from this tube, will more coins be allowed into the tube . MDB Harness The MDB Harness (See Figure 3 - 1 [ 10 ] ) is installed at the top left corner of Coin Changer . For details on how to install the Coin Changer into a Vending Machine, see Section 5 "Installation" . Figure 3 - 6 Tube Cassette Removal/Replacement