Lcd Symptoms; Touch Screen Symptoms; Figure 4.1 Connecting A Cash Drawer - Partner SP-850 Service Manual

Cashdrawer
2. Turn on the machine .
Refer to the following to prevent incorrect cash drawer status detection by the system:
Port I/O Port Address
Cashdrawer A
Control port
Cashdrawer B
Control port
Cashdrawer A
Status port
Cashdrawer B
Status port

LCD symptoms

• LCD backlight is not working but text is still visible on
screen
• LCD backlight is working but text is not visible on screen
• LCD screen is garbled
• Characters are missing pixels
• Screen is distorted
• Screen displays wrong color
• Screen displays extra vertical/horizontal lines

Touch screen symptoms

46 C H A P T E R 4 L O C A T I N G T H E P R O B L E M
Bit
05A8 0
05A8 1
05A8 6
05A8 7
Symptom
Condition
High(1) → Close
Low(0) → Open
High(1) → Close
Low(0) → Open
High(1) → Close
Low(0) → Open
High(1) → Close
Low(0) → Open
1. Reseat the LCD cable.
2. Reseat the inverter cables.
3. Replace the inverter cables.
1. Reseat the LCD cable.
2. Reseat the inverter cables.
3. Replace the LCD.
1. Reseat the LCD cable.
2. Replace the inverter cables.
3. Replace the LCD panel.
4. Replace the mainboard.
Figure 4.1 Connecting a
cash drawer
Note
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.
Corrective Procedure