Partner A4-1-K - LCD Symptoms

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Refer to the following to prevent incorrect cash drawer status detection by the system:
Port
I/O Port
Address
Bit Condition Note
Cashdrawer A
Control port
0508 0
High(1) → Close
Low(0) → Open
If Bit is set to Low to open
the cash drawer, after it
must be set back to High to
prevent the system as always
detecting the drawer as open.
Cashdrawer A
Status port
0510 1
High(1) → Close
Low(0) → Open
Cashdrawer B
Control port
0498 0
High(1) → Close
Low(0) → Open
Cashdrawer B
Status port
0520 1
High(1) → Close
Low(0) → Open
LCD Symptoms
Symptom Corrective Procedure
• LCD backlight is not working but text is still visible on
screen
• Reseat the LCD cable.
• LCD backlight is working but text is not visible on screen • Reseat the LCD cable.
• Replace the LCD.
• LCD screen is garbled
• Characters are missing pixels
• Screen is distorted
• Screen displays wrong color
• Screen displays extra vertical/horizontal lines
• Reseat the LCD cable.
• Replace the LCD panel.
• Replace the mainboard.