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Before Troubleshooting
SECTION 3
TROUBLESHOOTING
SECTION 3 describes the methods of trouble-
shooting.
3-2 refers to several errors specfied in a
system level.
3-3 describes normal operations and
the check points for abnormal operations. These des-
criptions define the Error Spot under operating
conditions.
3-1.
BEFORE TROUBLE SHOOTING
The following procedures are recommended to see
if the drive is really faulty or not:
1)
Incorrect operational procedure
2)
program error of host system
3) Poor connection with host system (esp. GND-
related connection, frame GND, etc.)
4)
Defective disk. Check that same trouble occurs
with other disks.
5)
Environmental conditions (where electrical noise
easily jumps into signal)
6) Influence of strong magnetic field
7) Wrong supply voltage
3·2.
TYPES OF ERROR ON A SYSTEM LEVEL
3·2·1. Soft Error
Soft error are caused by;
1)
Dirty head
2)
Electrical noise
3) Tracking error
4)
Poor connection with system
(GND-related connection)
5) Incorrect motor speed
6) Incorrect head compliance
Clean the head first. Check for index pulse interval
and head compliance and then read error spot more
than several times. If not readable, move the head to
the adjacent track in the same direction as before,
then return to the desired track, and read. If readable
this time, check radial alignment.
(Refer to 5-4)
If not readable yet, the error is not recoverable.
-15-
3·2·2. Write Error
To determine whether the disk or the drive is
failing. the disk should be replaced by other disks and
check that there still exists write error. If write error
does not exist any more, remove the old one. If write
error exists with use of any rlisk, drive might cause
write error.
3·2·3. Seek Error
Seek error comes from:
1)
Head movement is incorrect because ellectrical
noise jumps into signal.
2)
Head driving system might be at fault. If it is not
re-readable after re-calibration, drive might be at
fault.
3·2-4. Interchange Error
If data written on one drive is readable correctly
on another drive, but not by other drives, interchange
error exists.
Interchange errors are caused by;
I)
Head is not properly positioned.
2)
Motor speed is not correct.
3) Optimum head output level and offset and head
compliance are not obtained.
4) Chucking mechanism does not work.
3·3.
FAULT DIAGNOSIS BY MFD CHECKER
II
3-3-1
describes
check
method
for
normal
operations
in
accordance with the predetermined
procedUres.
3-3-2 describes check points for abnormal opera-
tions which come out in accordance with the above
procedures.
3·3·1. Normal Operation
Pre-setting:
1) Refering to Fig. 2-1 (Micro Floppydisk Drive
Connection), connect the drive to MFD Checker
II.
2)
Set the slide switch (SI01) on the disk drive to
"}".
3) Set all switches in the MFD Checker II to "OFF".
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