BASF 6106 - Page 62

4.3.5.
READ/WRITE
ELECTRONICS
—\\-
Jitter
I
i
h
i
r
i
i
i
H
-t-
-
^
1
1
I
4.3.5.1
JITTER CHECK AND
ADJUSTMENT
a. Load
a
BASF Mini
Disk
b. Turn
on
drive motor
c. Step
to
track 39
d. Write
all
"
ones
"
e.
Measure
with oscilloscope
Before
Adjustment
SYNC
INT. POS.
CHI
CHI
AC 200mV/div TJ1-7
CH2 DC
2V/div ID-
9
READ!
f.
Trigger
Oscilloscope so, that the
read
data
signal as
"
cateyes "are
displayed.
.
Measure jitter. If
necessary adjust
poti R 69 for jitter -c
100
nsec.
h.
Step
to track
i.
Check for
jitter ^ 500 nsec
If
this
value
is
exceeded replace
the
R/W- Control PCB