SERVICE MANUAL - Nexo

NXAMP4x43. Operation3-1. Entry of the test programWhile holding down the [SELECT4], [MUTE4] and [A]buttons simultaneously, turn the power switch on. Thestart up screen appears on the LCD.Start Up ScreenThen release your fingers from the buttons.The test program starts and the test menu screen appearson the LCD display.Test Menu Screen3-2. Executing the test and judgment displaySelect the desired test item from the table below usingthe rotary encoder, and press the [B] button to start thetest.Test Items List01 SWITCH02 ENCODER03 LED04 LCD05 RS23206 GPI07 PORT (no use)08 DSP09 WORD CLOCK10 12CAfter executing the test, the display returns to the testmenu screen if the test result is OK. If an error occurs,“ERROR” appears on the LCD and the test program isstopped. In that case, turn the power switch off and onagain as was done above in 3-1.4. Outline of tests4-1. SWITCH testPress the [B] button to start the test. The LCD shows oneby one the switch name to be tested as shown below.11 FLASH12 FAN13 SLOT14 ATTENUATION15 ANALOG16 BRIDGE17 CALIBRATION18 STANDBY19 QUITPress the switch displayed on the LCD as instructed oneby one.If all instructed switches are OK, the display automaticallyreturns to the test menu screen.4-2. ENCODER testPress the [B] button to start the test. The following displayappears.Turn the ENCODER knob clockwise. The 2nd line on thedisplay changes as shown below.TURN RIGHT 0 –> • • • • • –> TURN RIGHT 19The following display appears after the 2nd line on thedisplay reaches TURN RIGHT 19.Turn the ENCODER knob counterclockwise. The 2ndline on the display changes as shown below.TURN LEFT 0 –> • • • • • –> TURN LEFT 19The display returns to the test menu screen after the 2ndline on the display reaches TURN LEFT 19.4-3. LED testPress the [B] button to start the test. The following displayappears.The LEDs automatically light up one by one in a specificorder as shown on the next page.All LEDs will light at the same time after each LED individuallyhas been tested. Confirm that each LED is litnormally. If OK, press the [B] button to return the displayto the test menu screen.65