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Brother DP-525CJ Service Manual: Fdd (floppy Disk Drive) Control; Fdd Configuration; Table 2.3 Fdc(#5) And Fdd Module Links (interface Signals)

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THEORY
Electrical
10.

FDD (Floppy Disk Drive) Control

10.1.

FDD Configuration

The FDD consists of two sections: the FDD controller and the FDD module. The FDD
controller circuit controls the contents to be received and stores the data in the FDD
module. The FDD module drives the motors, sensors, and magnetic head. The
interface signals between the FDD and the FDC are shown in Table below:
Table.2.3 FDC(#5) and FDD Module Links (Interface Signals)
Signals
Read/Write
DRIVE SELECT Ø
Circuits
WRITE GATE
WRITE DATA
READ DATA
SIDE1 SELECT
Motor Drive
DC
Circuit
MOTOR
STEP
MOTOR
Status Check
WRITE PROTECT
INDEX
TRACKØØ
DISK CHANGE
Pin No.
10 12
24
22
30
32
MOTOR
16
ON
STEP
20
DIRECTION
18
SELECT
28
8
26
34
2-24
SERVICE MANUAL
Function
This signal is set to LOW when the FDD unit is
opening (except for the DC Motor).
When this signal is set to LOW, data can be written
by the WRITE DATA signal. When this signal is set
to HIGH, the READ and STEP operations are
enabled.
Data is written at the falling edge of this signal while
the WRITE GATE signal is LOW.
This signal indicates the polarity data read by the
head.
This signal is used to select the head:
LOW: Head 1
HIGH: Head 0
This signal becomes LOW, starting the DC motor,
when a disk is set in the drive. Setting this signal to
HIGH or removing the disk stops the DC Motor.
This signal sets the head in the direction designated
by the DIRECTION signal.
This signal designates the movement of the
read/write head:
LOW: Inward to the disk's center
HIGH: Outward from the disk's center.
When this signal is LOW, either there is no disk in
the drive or the disk in the drive is write-protected.
This signal indicates the beginning of a track by
outputting one pulse in each rotation of the disk.
When this signal is LOW, the head is located at track
00 (the outside track).
Otherwise, the signal is HIGH.
When this signal is LOW, there is no disk in the drive.

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  • brian aaron Jan 27, 2017 03:48:
    1-26-2017
    ​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​uno.com