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3. Diffraction grating
While adjusting the refraction grid, be
grids are completely misaligned,
o W h i l e i n t h e t e s t m o d e * l , p r e s s C H E C K
only the focusing servo ON.
*1 Test mode :
To enter this mode, short-circuit connector CN10 of the CD
Player unit {X32-1090-1 1l |"4'l4l , and turn Power switch OFF then
ON again.
*2 CHECK key :
For details, refer to Table 1.
ADJUSTMENT
sure that the
key"2 to set
Difiraction grid adjustment error
(reverse direction)
C h e c k t h e d i f f r a c t i o n g r i d .
A d j u s t t h e p i c k u p ' s d i -
f f r a c t i o n g r i d f o r t h e
m a x i m u m a m p l i t u d e
5 . 0 ( V p - p ) ?
A d j u s l t h e p i c k u P ' s d i '
f f r a c t i o n g r i d f o r t h e
m a x i m u m a m p l i t u d e
ls swelling observed
w i t h T . E i n a p p r o x . 1 2 g s
a f t e r R F t r i g g e r i s a p p l i e d a t
the upper side of the
( + ) s l o p e ?
T h e p i c k u p ' s d i f f r a c t i o n g r i d m a y b e
largely erroneous: Turn the diffraction
grid ad.justing driver to maximize the
amplitude at the position where the
swelling is observed 12ps alter triggering
l s t h e R F w a v e f o r m
undistorted when the
C L E A R k e y i s
The pickup's diffraction grid may be
erroneous in the reverse direction:
L a r g e l y t u r n t h e d i f f r a c t i o n g r i d a d j u s t -
t i n g d r i v e r t o m a x i m i z e t h e a m P l i t u d e a t
the position where swelling is observed
12ps after triggering
Press the CHECK
k e y a g a i n
T h e d i l f r a c t i o n g r i d a d -
j u s t m e n t i s c o m P l e t e .
nLl
" u
n
l l n
l l 0
l l
,d
NU
bf|l
llou
unE
f l U n
4il
llctl
tld
fl un
Procced to the
n e x t a d j u s t m e n t
Y E S
(Photo. 1
Y E S
(Photo.
U L
w
& , ^
$3
W h e n d i f f r a c t i o n g r i d a d j u s t m e n t i s
complete
Diffraction grid adjustment error
(large error in f orward-di rectionl
Fis. 1
23
ixf
, . '
'
j
|.1::
,".:l
li
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