Yamaha ACD1 Service Manual page 41

3-8. RTC test (NO. 09)
Contents: Indicates Real Time Clock.
Check if the clock is working.
Example of executing screen
*** 09. RTC
2000. 1. 15(SUN) 3:21:38
OK:[ENTER], NG:[0]
[RTC test screen]
Operation
・ Press the [ENTER] key in case of no error or press the [0] key in case of an error.
Check items
・ Check if the RTC (CPU circuit board: IC013) is installed properly.
・ Check signals between the RTC and CPU (CPU circuit board: IC002).
3-9. LCD test (NO. 10)
Contents: Check visually if the LCD backlight lights in the order of blue, red, white, OFF and blue.
Check visually if all the dots in the LCD screen repeat ON/OFF.
Example of executing screen
*** 10. LCD
Start LCD Test OK:[ENTER]
Back Light Test:
OK:[ENTER], NG:[0]
Full Dot Test:
OK:[ENTER], NG:[0]
[LCD test screen]
Operation
1. Press the [ENTER] key to start the LCD test.
2. Check that the backlight lights in the order of blue, red, white, OFF and blue. Press the [ENTER] key in case of no error or
press the [0] key in case of an error.
3. Check that there is no dot missing throughout the screen. Check also that all the dots repeat ON/OFF. Press the [ENTER]
key in case of no error or press the [0] key in case of an error.
Check items
・ Check the LCD module and FFC connector (BRG circuit board: CN401) peripheral devices in case of NG.
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ACD1
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