How to Tune a Mars TRC Series Coin Changer

        Although the MARS ELECTRONICS TRC Series Coin Changers are factory preset to

maximize valid coin acceptance, the unit may require periodic tuning--particularly to

correct the frequency differences that can result when the Acceptor/Gate Assembly and/or

the Control Board/Backplate Assembly are replaced. Because of a special TRC Series Changer

feature, only coins are required for tuning purposes. Normally, the TRC Series Models are

factory tuned for the U.S. coin set only. When tuned for the U.S./Canadian set, the

changer will have a "6XXX-C" label.

Preparing for Tuning

Before performing either of the tuning procedures, follow these steps:

1. Power off the Coin Mech.

2. Hinge down the Acceptor/Gate Assembly.

3. Set a price on the price switch.

4. Set the option switches as follows:

     a. Switch #1--up

     b. Switch #2--down

     c. Switch #3--any position

     d. Switch #4--any position

5. Short the two pins of J9 by touching both

  simultaneously with the tip of a screwdriver

6. Hit Tune Mode

7. Push Start then 110 Volt or 24 Volt

8. Instate power to the changer, then remove the

   screwdriver.

9. Press the Acceptor/Gate Assembly back into

   position.

10. The changer is now in the tuning mode.

Tuning

1. Drop 1 .05 Nickel

2. Hit Coin Return

3. Drop 1 .10 Dime

4. Hit Coin Return

5. Drop 1 .25 Quarter

6. Hit Coin Return

7. Drop 1 Dollar Coin

8. Hit Coin Return 2 Times

9. Drop 20 Nickels

10. Drop 20 Dimes

11. Drop 20 Quarters

12. Hit Start/Stop Button to End Session