BASF 6106 - Page 63

4.3.6 PHOTO TRANSISTORS
AND
LED's
4.3.6.1.
PHOTO TRANSISTOR
REPLACEMENT
a. Disconnect plug of
defect
photo
transistor.
b.
Remove photo
transistor
c. Insert
new
photo
transistor
d.
Reconnect
plug
-
e. Check the function
of the
photo
transistor
d.
Provide
the Index detector
adjust-
ment, if the Index photo
transis-
tor have
been
changed.
4.3.6.2
LED
-
Replacement
a. Solder out the LED
b.
Put in the new LED
c. Check
the function
of the LED
d. Provide
the
index detector
adjust-
ment
if the Index
LED
have
been
changed.
4.3.6.3.
INDEX
DETECTOR ADJUSTMENT
CHECK
a. Load a BASF
-
CE mini disk
b. Start the
drive motor and select
the
mini
disk drive
c. Step
to
track
d. Measure with
oscilloscope:
SYNC
CHI
CH2
MODE
TIME
BASE
EXT. POS.
TJ2-8
AC 100 mV inverted
TJ1-7
AC
TOO mV
TJ1-9
ADD
TOO
/usee
/
Div
e.
Check
the timing between start
of
the sweep
and the data burst
for
450
/usee
*
80
/usee
£. Provide
the index
detector adjust-
ment
(4.4.6.4.) if
necessary.
4-13