Yamaha disklavier MX-100A, Service Manual

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Test Program
1. STARTING/ENDING THE TEST PROGRAM
Among the two ROMs used for piano player control, ROM B contains the test program. When you
simultaneously hold down the L and R buttons while you turn ON the power, TEST mode is entered.
Upon entering TEST mode, the ROM Version, Table Version, Trimmer Value, and Controller Type are
displayed as shown below.
After the above display appears, use the " + " button to increase the value of the Test No. so that each
test can be executed. (Press the " - " button to return to the previous Test No.) To terminate TEST mode,
turn OFF the power to the controller.
2. DESCRIPTION OF EACH TEST
1) 7-Segment LED Test
The two 7-segment digits change from "0" to "9", the six LEDs light up successively from left to right
next, all LEDs light up then go out. This entire process is repeated.
2) LCD Test
The characters which have been preset at the lower row of the LCD are displayed as flashing characters.
3) Buzzer Test
Along with the flashing display of "EXECUTING!" at the lower row of the LCD, the buzzer is sounded
in alternately long and short intervals.
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