Sram (#7) Access; Fig. 2.22 Example Of Control Signal Timing Chart; Table 2.2 Table Of Lcd Modules - Brother DP-525CJ Service Manual

SERVICE MANUAL
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.
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.
Specification
Model Name
DP-525CJ LW-800ic
DP-530CJ LW-810ic
LW-810icBL
DP-540CJ
DP-550CJ LW-840ic
Note: VEE voltage is the values measured at connectors CN7 and CN8.

Fig. 2.22 Example of Control Signal Timing Chart

Table 2.2 Table of LCD Modules

No. of Horizontal No. of
Dots Vertical Dots
480
480
480
640
640
Panel Type
64 Reflective
128 Reflective
128 Transflective yes
400 Reflective
400 Transmissiv
e
2-21
THEORY
Electrical
Backlight VEE (V)
no –17.5 to –14.5
no –17.5 to –14.5
–17.5 to –14.5
no +22 to +30
yes +26 to +37