Preventive Maintenance; Specifications - Panasonic JU-475-4 Service Manual
Flexible disk storage drive
Hide thumbs
Also See for JU-475-4:
- Service manual (33 pages) ,
- Service manual (34 pages) ,
- Service manual (33 pages)
Table of Contents
Advertisement
7. PREVENTIVE MAINTENANCE
No preventive maintenance is necessary fo r any FDD under normal conditions.
However if adjustments are necessary, the procedures in this manual must be follow ed.
•
Adjustments (Refer to Table 8-1)
(1) Make a read/write head radial adjustment at the specified track. (Sides 0,1)
(2) Make an index burst adjustment a t the specified track. (Sides 0,1)
(3) Make an azimuth measurement a t the specified track. (Sides 0,1)
CAUTION
Do not w rite when using alignm ent diskette. Check th a t w rite protect sensor is properly operating
w ith a data diskette.
Note:
Section9 describes the adjustment procedure in detail.
8. SPECIFICATIONS
• MINI (a) type
Drive m otor is dual speed type. (300 rpm o 360 rpm)
Item
Parameter
1
Index period
2
O utput level
3
M odulation
4
Resolution
5
Radial A liqnm ent
6
A zim uth
7
Index burst
8
Track 0
Asymmetry
9
10
Head load tim e
• MINI (ß) type
Drive m o tor is fixed speed type. (360 rpm)
Item
Parameter
1
Index period
2
O utput level
3
M odulation
4
Resolution
5
Radial A liqnm ent
6
A zim uth
7
Index burst
8
Track 0
9
Asymmetry
10
Head load tim e
Table 8-1
Specifications
M lN U a) • mode
TRACK
VALUE
32
2ÖÖ ± 3.0ms
79
18QmV o r m ore
00
20% or less
79
.... 79
% o r more
60
32
±
'"""""""± "1 ? ........." i i i i l l l l l l
68
250
From track 0 to
Q ,6xVrc
track 2 and back
TH £ S.9m$
79
< 500ns
00
< 50ms
79
M IN I {ß) - mode
''
''' '""" '''''''''
t r a c k
v a l u e
32
166.7
18QmV or more
79
00
20% or less
79
79
60% or more
32
t
68
± 18'
68
208 + 125us
From track 0 to
0.6xVcc
tra c k 2 and back
TH S $+ 9ms
' " " ' "79 ..........
' ' < 500ns......
'00
<
79
6
-
-
JU - 475 - 4AEG
MAXI - m ode
TRACK
32
79
O O
79
...........7 9 ...........
—
70%
I50us
±
8 !!!ll!l!l:|l!i8 !!!lll!ll
79
JU *475»4A<36
MAXI • mode
'''.....
TRACK
± 3.4ms
—
79
00
79
79
— *
70%
—
—
............ ....... < 350ns
........
79
50ms
v a l u e
166.7 ± 3.4rrts
IBOmVor more
20% o r less
60% o r more
—
—
< 350ns
—
VALUE
—
180 mV or more
20% or less
60% o r more
—
—
—
—
Advertisement
Table of Contents
