Nov.2002 fig.test121_70 14. Switch2 test This tests the operation of the MC-909’s switches. This will test the switches that were not tested by the Switch1 & LED test. When you enter the Switch2 test, the LCD display will show as follows. fig.test141_70 One at a time, operate all controls (except for the [VOLUME OUTPUT] knob and the [VOLUME INPUT] knob) from the MAX through MIN range. Verify that the indication of the corresponding knob becomes dim in the LCD display. When the indication of all knobs has become dim and the test result is OK, you will automatically proceed to the next test item. One at a time, press the switches that are shown in the LCD display. 13.
Switch1 & LED test Verify that in the LCD display, the indication of the corresponding switch becomes dim. When the indications of all switches has become dim and the test result is OK, you will automatically proceed to the next test item. When you enter the Switch1 & LED test, the LCD display will show as follows. This tests the operation of the MC-909’s LEDs and switches. fig.test131_70 15. LCD test This tests the operation of the LCD display. When you enter the LCD test, the LCD display will show as follows. fig.test151_70 One of the panel switches with an LED will light. When you press that switch, the next switch with LED will light.
Repeat this until all of the switches produce a result of OK, and you will automatically proceed to the next test. Press the [F6] button to proceed to the four-level test. The LCD display will show as follows. It is not valid to press two or more switches simultaneously. fig.test152_70 Switches with an LED window will produce the OK result when you press them once. However, a switch with an LED window that is adjacent to directly exposed LEDs will produce the OK result when pressed the same number of times as the number of directly exposed LEDs. For the [V-LINK] button, verify that the LED color is blue and that the key top color is white.
(Shown in the LCD display.) For the [SAMPLING/RESAMPLING] button, verify that the key top color is red. (Shown in the LCD display.) For the [MIX IN] button, verify that the key top color is white. (Shown in the LCD display.) For the [ENTER] button, verify that the LED color is blue. (Shown in the LCD display.) The [TAP] button also includes the 7-segment LED test. Verify that when you press the [TAP] button, the 7-segment LED lights successively from the left digit. Press the button four times to obtain the OK result. The [PLAY] button has a dual-color LED. Verify that the LED color alternates between red and green.
Turn the [LCD CONTRAST] knob, verify that four levels are displayed, and adjust the contrast to the optimal setting. 28