5-7
Resolution Check
a)
Insert and clamp
a
black
diskette.
b) Move
the heads
to
track
39,
write
1 F and 2F by the
top
head and measure the average output
level of each
frequency.
c)
Write 1 F and 2F by the bottom head and measure the average output
level of each frequency.
d)
The resolution is higher than
55%,
and calculation shall be made as
follows:
Resolution
=
2F output (mV)/1 F output (mV) x 100
e)
Move the heads
to
trackOO, write 1
F
and
2F by
the
top
head and measure the average output
level of each
frequency.
f)
Write 1 F and
2F by
the bottom head and measure the average output level
of each frequency.
g)
The
resolution is lower than 95%.
Measuring condition
Channel 1 -TP1 (10mv/div)
Channel 2 -TP2 (10mv/div), invert
Mode -ADD
Sweep -20ms/div
Trigger -TP6
5-8
Symmetry Check.
a)
Insert
and clamp a
blank
diskette.
b)
Move the heads
to
trackOO
and
write 1
F by
the
top
and bottom heads.
c) Check
the symmetry
as
described in Fig.
5-8.
d)
Exchange the head assembly if the symmetry is
out
of the range as
described in Fig.
5-8
on only one
head
side.
e)
Exchange the printed circuit board if symmetry is out of
the range on both heads.
f) If the symmetry is still out of the range, exchange head
assembly or printed circuit
board that was not
exchanged on the previous step.
•
4
TP5
(Read data)
Trigger
-»i-U-
T=400"s or
less
*
,
Fig.
5-8
Symmetry
Check
Measuring condition
Channel 1 -TP1 (0.1V/div)
Channel
2 -NC
Mode -CH1
Sweep
-0.5
us/div
Trigger -INTERNAL, Slope
=
(+)
5-9
Write Protect Sensor
Check
a) Load and unload a blank diskette which is not write protected,
and check that write protect sensing
is
definitely made using Brian.
b)
If the write protect sensing
does
not work well, exchange lever frame
assembly according to
4-7.
c)
Repeat from
(a).
5-10
Head
Cleaning
a) If you
tend
to
clean the heads,
use
the special diskette which is
sold
as
"cleaing diskette". We would
recommend the wet
type
cleaning diskette that
uses
"cleaning
liquid".
14
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