Crown XLS1000 - Page 85

Figure 3: Flowchart for troubleshooting LCD issues
Figure 4: Toggling on LCD_EN
ERROR
CODE
0X12?
BAD U706
(MICROPROCESSOR)
INTERMITTENT
CONNECTION
LCD_EN
(LCD PIN6)
TOGGLE?
OPEN/SHORT
U706 PIN 53
LCD_RW
(LCD PIN5)
TOGGLE?
LCD_D4-D7
(LCD PINS
11-14)
TOGGLE?
LCD_RS
(LCD PIN4)
TOGGLE?
BAD
LCD
Y
N
Y
Y
Y
Y
N
N
N
N
N
Y
OPEN/SHORT
U706 PIN 52
OPEN/SHORT
U706 PINS 33-36
OPEN/SHORT
U706 PIN 51
ERROR
CODE
0X11?