Technics SL-P250 - Page 45

[E] servo CIRCUIT
Note: Original circuit uses AN8377 for
1103 while the new circuit uses
(TRAVERSE)
SPEED
RA| POSITION
SENSOR
K ey
Ome Om O
od $e
gee
a b
OPTICAL PICKUP
a
(FOCUS)
(TRACKING)
a
820
5 !
S)
0.047
RF vec
O OmO=™=O O
o_o > os
OPTICAL PICK UP
Qiol
2SA1547
AUTO POWER
CONTROL
xroroaoaoad
AN8377N for 1C103. (Refer to
the table below for other
changes.)
16103]
AN8377 AN8377N 1Cl1O3
— AN8377
10104 | LM2940TSM Removed FOCUS/TRACKING
/ TRAVERSE COIL ORIVE
2S812400R
O02, |, -Hemoved Added (BTL DRIVE)
C140 0.01 pF- Removed
C145 6V 100nF Removed
yerioe'| Removed Shorted
2ms: 1V/DIV
1C104
~
LM2940T5M
REGULATOR
8 :
>
: a
2
2SB1240
re
o SWITCHING 2ms-2V/DIV,
CT
1c1o2
AN8374S
10K
cl47 4 jo 008.
RI28
25v47
(OV) 4.9V,
LOvi4-3G5) TRVR
fa COV }49V
m
~e aoca
[| ke
S @)
° z 3 a
ie
Ria 68K Has
9
RQ 22K
h OV
Pl
O5us.o.2w/div.~ 0.5p8. O.1V/D1V.
“VK ey RRR |
SERVO PROCESSOR
Ploy
0.5ys. O.1V/DIV.
05v
p-P
Ploy
2ms.05V/ DIV.
RIO
2.2K
ci20
Play
2ms.0.1V/D1V.
C133 33P
ov)
C110 680P: OV
Clll 0.22
C135 0.22
(Ov)
1c10l
AN8373S
SERVO AMP
(0) PV VRIO6
WaGTSa| 20s
25V ia
Focus gain
adj.
oc
Best eye adj|
Tracking balance
adj.
Play
0.5ps.0.5V/DIV.
ARE pos
_Focus offset adj.
Ploy
2ms.0.1V/DIV
_ eh josver
Play
2ms.0.1V/O1V.
Sys.2V/DIV. as \W/DIV.
0.35V
5.2V
fee ov
CN402
—— =
J
SPINOLE
MOTOR
To Servo Gain
Adjuster
Q402
2SB 1240
MOTOR DRIVE
BA4SS8FTI
MOTOR DRIVE
Q30l
OTCI24EST
SWITCHING
I Swine o7o1
2SD0 1862
CIRCUIT MOTOR DRIVE
LOADING
OPEN/CLOSE
DETECTOR
a
b
c
d
e
CN103 f
: } Q
h
a
b
“.€
9403
2SD 1862
MOTOR ORIVE
i
0404
2SB 1240
MOTOR DRIVE
10
B D/A CONVERTER/AUDIO CIRCUIT
R420 4.7K
[avg
<3) CLOSESW
| Tovey
<6] -8.6v \G00P
ov
~2.0V
SOps 2V/01V
Tee
ov
!O0ms.2V/DIV
2ps.2v/01V
ips. 2VA0IV
< <
a
z
z
R401
220
b
c
d
e
cneoe
4
f
g
h
To
iA]
i
OPERATION
j
CIRCUIT
309 0.01 Fait
a
b
—CN605 +—~ &
~@
0410
MA4033M
O411
DTC 124EST
RESET
R435,
1K
1c302
CXK58 16M
16K RAM