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Brother DP-525CJ Service Manual: Cbic And Peripherals; Main Rom (#12, #13); Main Ram (#10, #11); Video Ram (#7)

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CBIC and Peripherals

CBIC (#8) is a Cell-based IC in which logic circuits for controlling peripherals are
integrated with the CPU core. With the functions incorporated in it, CBIC (#8) controls
all the functions of the system including printer control and control of the LCD display.
Main ROM (#11, #12)
Installation of a maximum of 8 Mbytes (32 Mbits x 2 pcs.) of ROM is possible. The
capacity of ROM installed in the machine is determined by whether or not the chip
resistor R71 is installed.
Main RAM (#9, #10)
The following RAM can be installed at #9 and #10.
Note that simultaneous installation of RAM at #9 and #10 is not allowed.
Video RAM (#6)
The capacity of the video RAM used to retain the data to be displayed on the LCD is
256 Kbit. It secures the display area for different sizes of LCDs, from 480 x 64 dots to
640 x 400 dots.
The RAM area not necessary for the LCD display can be used as the work area.
Printer Driver Circuits (#2, #3, Q1 to Q4, and Q23 to Q26)
The printer driver circuits convert the motor phase driver signals output from CBIC (#8)
to +24V drive signals, which are output to the motors and ink cartridge.

FDC (Floppy Disk Controller)

The FDC controls floppy disk drive access through the FDD drive circuit.
R71 installed:
R71 not installed:
16 Mbit DRAM
#10: 4 Mbit DRAM
32 Mbit ROM
16 Mbit ROM



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  • brian aaron Jan 27, 2017 03:48:
    ​I have a brother dp 540cj and it has a built in diskette drive.
    I have a ibm thinkpad latop. I connected a Memorex external usb floppy drive to the ibm thinkpad laptop. i'm copying 3 files from the ibm thinkpap (notepad) to the square 1.44 mb diskette. no problem, the 3 files were copied to the diskette.
    ​I turn on the brother dp 540cj, select file manager, insert the square diskette. the brother dp 540cj open only the file names on the disk. I try to open word text on either of the 3 files on the disk and the brother dp 540cj don't open the word text in any of the 3 files. I have been trying for several days to open the word text on the files using the brother dp 540cj and don't have any further instructio​ns for this problem. I tried saving the file names to all coding - Unicode, ansi utf-8 and can't fix the electronic problem.
    m​y email address is snowwash@j​