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Brother DP-525CJ Service Manual: Fdd Module; 10.3.1. Read/write Circuit; 10.3.2. Motor Drive Circuit; 10.3.3. Sensor Circuits

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FDD Module

The FDD Module is composed of the motor, sensor, magnetic head, and the IC that
drives them. The FDD Module is controlled by the FDC (#5) of the MAIN PCB.

10.3.1. Read/Write Circuit

In read operation, the circuit amplifies the analog signals picked up by the magnetic
head and converts the analog signal to serial digital pulses. The serial pulses are then
transmitted to the FDC (#5) and decoded to parallel digital data.
In write operation, the circuit controls the current at the magnetic head according to the
serial digital pulses from the FDC #5.

10.3.2. Motor Drive Circuit

The motor drive circuit consists of two parts: a DC motor drive circuit and a stepping
motor drive circuit.
The DC motor drive circuit controls the DC motor, which rotates the spindle according to
the MOTOR ON signal from the FDC. The stepping motor drive circuit controls the
stepping motor, which operates the magnetic head unit according to the "STEP" and
"DIRECTION SELECT" signals from the FDC #5.

10.3.3. Sensor Circuits

The following sensor circuits detect the status of the FDD:
1. Write Protect Sensor
When a write-protect notch on a disk is set to the write-protect position, the "WRITE
PROTECT" signal becomes LOW. A micro-switch is used for detection.
2. Index Sensor
The "INDEX" signal shows the beginning of a track; when the beginning of a track is
detected, the "INDEX" signal becomes LOW. A magnetic sensor is used for
3. Track00 Sensor
When the magnetic head is positioned in track 0 on a disk, the "TRACK 00" signal
becomes LOW. A photo sensor is used for detection.



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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​