Service manual

REPAIR
Troubleshooting
SERVICE MANUAL
3-44
7.3.4.5. FDD Read Error Rate Check
(1) Without a diskette in the disk drive, select "E" 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:
Insert disk and press RETURN. Press CANCEL to exit.
READ CHECK ERROR TIMES
PASS NO.
TRACK NO.
FDD ERROR RATE CHECK
**********
Fig. 3.28 FDD Read 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 Read Error Rate check is started:
a) The diskette is formatted.
b) Data “DB6" is written to all daya areas in order, setting with track 0.
c) The data on both sides of a randomly designated track is read (Pass No. and
TRACK NO. are printed if an error occurs.)
d) Written above is read (PASS NO. and TRACK NO. are printed if an error
occurs).
d) Steps (c) is 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.