Brother DP-550CJ, Руководство по обслуживанию

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THEORY
SERVICE MANUAL
Electrical
2-21
9.1. LCD Control
The CBIC (#8) controls the LCD control signals and the SRAM access.
The display data written to the SRAM (#6) is read by the CBIC (#8) in regular intervals,
converted into the 4-bit parallel data by the CBIC (#8) and then sent to the LCD module.
Black and white of the display data are inverted by connecting the R55 (#8 REV
terminal). Connect the R55 if the transmission type LCD is used.
The timing of display control signals differs according to the LCD type. The timing is set
by the status of the DMODE (3:0) terminal in the CIBC (#8) in the reset state and by the
setting in the program after the reset is canceled. An example of the control signal
timing chart is shown in Fig. 2.22.
Fig. 2.22 Example of Control Signal Timing Chart
9.2. LCD Module
The LCD modules used in the respective models are shown in Table 2.2. The control
signal timing and drive voltage (VEE) differ according to the LCD module.
Table 2.2 Table of LCD Modules
Model Name
Specification No. of Horizontal
Dots No. of
Vertical Dots Panel Type Backlight VEE (V)
DP-525CJ LW-800ic 480 64 Reflective no –17.5 to –14.5
DP-530CJ LW-810ic 480 128 Reflective no –17.5 to –14.5
LW-810icBL 480 128 Transflective yes –17.5 to –14.5
DP-540CJ 640 400 Reflective no +22 to +30
DP-550CJ LW-840ic 640 400 Transmissiv
e yes +26 to +37
Note: VEE voltage is the values measured at connectors CN7 and CN8.