Service Mode; Display; Touch Panel - GE PANDA Service Manual

Chapter 1: Functional Description
System Functions

1.3.7 Service Mode

A series of restricted service menu screens allow a technician to change system defaults, perform
diagnostics and view the unit's PCB and software revision levels. The service mode is initiated by holding
both the Help and Alarm Silence keys during power up.

1.3.8 Display

The color VGA display is driven and powered by the Control Board. The Control Board includes a dedicated
graphics controller with on-board memory. The LCD is backlit with two low voltage LED strings. The LCD
backlit driver is located on the Control Board.

1.3.9 Touch Panel

The touch panel has membrane switches and is wired to the Control Board. (Refer to
from the switches are received by the main application processor.
1-16
LCD Display
Backlight
Digital RGB
Intensity
Control
J1
LED Driver VGA
Controller
PWM
Main Application
Processor
FIGURE 1-10. Touch Panel and Display
Touch Panel
PB0 - 11
DGND
Control Board
J5
Video
RAM
IO
Figure 1-10.) Signals
Service Manual