Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 315)

Troubleshooting & Repair Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 295
8.7. FRONT PANEL/DISPLAY INTERFACE ELECTRONICS
Users can input data and receive information directly through the front panel touch-
screen display. The LCD display is controlled directly by the CPU board. The touch
screen is interfaced to the CPU by means of a touch screen controller that connects to
the CPU via the internal USB bus and emulates a computer mouse.
Figure 8-25: Front Panel and Display Interface Block Diagram
8.7.1. FRONT PANEL INTERFACE PCA
The front panel interface PCA controls the various functions of the display and touch
screen. For driving the display it provides connection between the CPU video controller
and the LCD display module. This PCA also contains:
 power supply circuitry for the LCD display module
 a USB hub that is used for communications with the touch screen controller
and the two front panel USB peripheral device ports
 the circuitry for powering the display backlight