Mar.2006 MC-808 Test items 3. Output (MIX) test 0. Version check The LCD display will show the following. fig.test03.eps_68 When you enter Test mode, you will start with the Version Check item fig.test00.eps_68 Test the audio signal (L/R) that is output from OUTPUT MIX. The output will be L: 330 Hz sine wave, R: 440 Hz sine wave. If the output is correct, press [CURSOR >] to proceed to the next test item. The program version number will appear in the LCD display and the 7- segment display. 4. Output (DIRECT) test Press [CURSOR >] to proceed to the next test item. * The version number shown may be change; e.g., “1.02” The LCD display will show the following. 1.
Self Check fig.test04.eps_68 This tests various devices. When you enter the Self Check, the LCD display will indicate the following, and will automatically test a total of fourteen items. fig.test01.eps 1 2 3 4 5 6 7 Test the audio signal (L/R) that is output from OUTPUT DIRECT. The output will be L: 660 Hz sine wave, R: 880 Hz sine wave. If the output is correct, press [CURSOR >] to proceed to the next test item. 5. Input test The LCD display will show the following. fig.test05.eps_68 8 9 10 11 12 13 14 If all are “O” (ok), you will automatically proceed to the next test item. If a problem is found, an “X” will be shown to indicate the location of the problem.
(You will not proceed automatically.) Input an audio signal to INPUT L/R. LCD display indication and appropriate service action Slowly turn the INPUT volume toward the MAX position. Compare the audio signal being input to INPUT L/R with the audio signal that is being output from MIX L/R. If there is no problem, turn the INPUT volume toward the MIN position, and then press [CURSOR >] to proceed to the next test item. 6. Mic test The LCD display will show the following. fig.test06.eps_68 Input an audio signal into INPUT L. Slowly turn the INPUT volume toward the MAX position. Compare the audio signal being input to INPUT L with the audio signal that is being output from MIX L.
If there is no problem, press [CURSOR >] to proceed to the next test item. 2. Output (PHONES) test 7. Demo Play/Mute/7-segment test The LCD display will show the following. This tests the mute circuit and the 7-segment display. The LCD display will show the following, and an internal pattern of the MC- 808 will begin playing. fig.test02.eps_68 fig.test07.eps_68 Test the audio signal (L/R) that is output from PHONES. Slowly turn the OUTPUT volume toward the MAX position. Verify that an audio signal is output from the PHONES jack or the OUTPUT MIX L/R jacks. The output will be L: 110 Hz sine wave, R: 220 Hz sine wave. If the output is correct, press [CURSOR >] to proceed to the next test item.
Next, verify that while you hold down [TAP], the LCD display indicates [Mute: ON] and the audio signal is muted. Visually verify that the 7-segment display lights in the order of “top right” - “bottom right” - “bottom” - “bottom left” - “top left” - “top” - “middle” - 27 LCD display indication Service action 1 Version Update the program 2 SubCPU Check that IC1 (PANEL) and the MAIN-PAN- EL wiring are installed correctly. 3 FLASH (NOR) Check that IC2 (MAIN) is installed correctly. 4 SD-RAM (MAIN) Check that IC3 and 6 (MAIN) are installed cor- rectly. 5 MIDI Check that IC7 and JK2 (PS) and the MAIN-PS wiring are installed correctly. 6 WX Check that IC47 (MAIN) is installed correctly.
7 SD-RAM (DSP) Check that IC51 (MAIN) is installed correctly. 8 WAVE ROM Check that IC46 (MAIN) is installed correctly. 9 USBC Check that IC30 (MAIN) is installed correctly. 10 CF Check that CN15 (MAIN) is installed correctly. 11 DIMM Check that CN12 (MAIN) is installed correctly. 12 FLASH (NAND) Check that IC28 and 29 (MAIN) are installed correctly. 13 SD-RAM (SMPL) Check that IC45 and 49 (MAIN) are installed correctly. 14 SLIDER (1-8) Check that the FADER board and the two sets of wiring connecting the FADER board are in- stalled correctly.