Yamaha CL3 Service Manual page 145

5) – 9) Have the entire screen covered in white, red, green
blue and black each time (the example below shows the
screen in green) and check that there is no dot that is
black or in any other color.
1-19. TOUCH PANEL Test
Contents: Checks the input of the touch panel.
As the LCD is touched, the touch point scale appears
at the top and left of the LCD.
Also, at every touch of the LCD, the LCD luminance
changes between low and high.
After checking, select [OK] or [NG] as the check
result using the dialog box of the test program.
Example of executing screen
LCD display
With the finished product, perform the following check
separately from this check. After initialization, turn on
the power by pressing the [STORE] key, select [TOUCH
SCREEN CALIBRATION] from MENU, and press 4 corners
of the square sequentially. As a cross cursor appears, check that
its position is the same as the pressed position.
This check should be performed while sitting. If performed while
standing, the cursor will look to appear at slightly higher position.
1-20. HAAD Test
This function is unused.
1-21. RECORDER Test
Contents: C h e c k s t h e c o n d i t i o n o f t h e D a t a B U S a n d
AddressBUS by writing/reading the register of the
RECORDER IC (MP3 Decoder/Encoder).
C h e c k s t h e S I O c o n n e c t i o n w i t h D S P 7 b y
transmitting and receiving signals.
Also, checks the CPU connection between DSP7
and SH7724 by transmitting and receiving signals.
Example of executing screen
Display in case the check result is NG
1) CPU Interface (Data Bus) ...
NG: IC402 0000 XXXX 0000 0000 0000 X00X X = Error bit
MSB
CL3/CL1
LSB
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