Brother DP-525CJ - 7.3.4.4. FDD Write Error Rate Check; Fig. 3.27 FDD Write Error Rate Check Display

REPAIR
Troubleshooting
SERVICE MANUAL
3-42
7.3.4.4. FDD Write Error Rate Check
(1) Without a diskette in the disk drive, select "D" from the Self Test menu. (If a serial
number has not been input before starting the test, the pop-up window will prompt for
the serial number; either enter the serial number and press RETURN, or press
RETURN to start the test.) The display as shown below appears:
FDD ERROR RATE CHECK
**********
Insert disk and press RETURN. Press CANCEL to exit.
WRITE CHECK ERROR TIMES
PASS NO.
TRACK NO.
Fig. 3.27 FDD Write Error Rate Check Display
(2) With paper set, insert a diskette that is not write-protected in the drive and press
RETURN. The screen message changes to "working" during formatting, and 0 is
displayed at PASS NO.; then the Write Error Rate check is started:
a) The diskette is formatted.
b) Data “DB6" is repeatedly written on both sides of a randomly designated track.
c) The data written above is read (PASS NO. and TRACK NO. are printed if an
error occurs).
d) Steps (b) and (c) are repeated for all tracks (should not be repeated twice for
the same track).
e) 1 is added to the PASS NO. counter.
f) Steps (b) through (e) are repeated 500 times.