Lcd Display Pwba And Contrast Control Pwba - Xerox DocuColor 12/DCCS50 Service Manual

LCD Display PWBA and Contrast Control PWBA

The LCD PWBA, shown in Figure 1, contains the 640 by 240 pixel LCD display as well as its
drive circuitry. All data and timing signals to the LCD are generated by the LCD Display Micro-
controller on the UI Base PWBA and routed through the Contrast Control PWBA. Two DC volt-
ages, V-EE (+28 VDC) and V-LCD (0 to +5 VDC adjustable), control the brightness and
contrast of the LCD display. V-LCD can be adjusted by a variable resistor located on the Con-
trast Control PWBA and accessible to user.
Principles of Operation
LCD Display PWBA and Contrast Control PWBA
1/05
10-30
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