Technics SL-PJ33 - Page 6

Mi SCHEMATIC DIAGRAM (Optical servo circuit) M@ MEASUREMENTS AND
1
2
3
4
5
6
7
ADJUSTMENTS
e Addition of tracking balance adjustment
fees
CN
‘oe
——
Nadie
ae
Tracking
balance
adj.
a
dt
To
L¥
C104
Focus
coil
drive
j
La
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Focus
error
amp.
AN6554NS
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R127
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bh
eniee
LR
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(2)
TRACKING BALANCE ADJUSTMENT
Note: This adjustment must be done after all
previous electrical adjustments have been
done. (VR101, VR102, VR103, VR104 and
VR105)
YOO OOO . Remove the shorting connector from connector
CK EXO) CN105 of the servo P.C.B. and connect the
test fixture for tracking balance adjustment
(SZZP1053F), to it.
. Turn ON the power switch of the player and
insert a test disc (SZZP1014F or SZZP1054C).
. Set the player to the play mode and play track
No. 1
. Connect CH-1 of the oscilloscope to point @
(+) and point (—) of the test fixture as
shown in Fig. A.
Oscilloscope setting: VOLT
Play 2ms 2V/DIV
{ 3Vp-p
RI50 RIS!
8.2K 6.8K
R135 Cus
27 50V 0.22
a
RI63 100K
Cil4 5OVI RI3I 4.7K
x
7 Q102, 104
2SD 1055
racking Tracking coil
O°
1cl1o2 Q103,105 4
offset ad). Nao53Bs 2SB822 drive
1c 104
Focus offset adj.
. Adjust VR106 so that the DC voltage is 0+5mV
as shown in Fig. B.
Disconnect the test fixture, and reinsert the
Resistance shorting connector to CN105.
Unit
50V
C144 0.01
Ri22 clog
27
otis §! To CN105
|
(Servo P.C.B)
Or AA
(M) Test fixture (SZZP1053F)
i Fig. A
RII2 47K
10103 Traverse
ay
servo
C122
eitgert
MN}
AN6554NS
e10s
2508
Traverse
coil
drive
ES 10K a
R110 560K
723° 0.001 ? ;
ers
,
|
e
&
eee 2.2K dia | : ;
Ho pai
a 2.2K
re.
1
4 —----F 516
R114 820K
Pan gain adj.
Play
2ms O.1V/DIV
Q107 ,109 QI06 , 108
mill
fo.
1
639
ark
2SB822
2SD
1055
Focus gain adj. 1 CLOSE
nm
3 i S101
se reYo! * i fe)
ny I1c104 ‘ 27 E Play Ips !V/D1V 3 fe) cN201
ee ror CLOSE ro"
THR a4 r) {ST o.com 16)
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oT a as
N35
~—o Play 2msO.IV/DiV
| 04
Tracking
error amp.
Regulator
;
Kor
epee
1]
DIO1,102 2, aT T SL cose 15)
MA4056
| setae GND eS
<| — 9.5v [x] 95
eee reas 1O
Oats 3}
| est ev 1S
ret Ta rot
Ic1Ol
AN8370S J j 2SB822
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Printed in Japan
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