Yamaha QL5 Service Manual page 137

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
Input the check result using the dialog box as shown below.
LCD display
With the finished product, perform the following check
separately from this check. After initialization, turn on the
power by pressing the B [SEL] 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. 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
2) SIO Connection (DSP7 → RECORDER)
NG: IC206 [SO08] → IC402 [BDR0]
SIO Connection (RECORDER → DSP7) ...
NG: IC402 [BDX0] → IC201 [SI09]
NG: IC402 [BDX0] → IC203 [SI09]
QL5/QL1
LSB
137