Schematic Diagram - Technics SL-PS740A Service Manual

m SCHEMATIC DIAGRAM
(Parts list on pages 34~37)
Notes:
eS601~612 : Numeric(>10, O~10) switches
©S613
©S614
©S615
0S616
©S617
eS618
eS619
°S620
0S621
©S622
©S623
©S624
©S625
©S626
©S627
©S628
eS629
S630
S631
© S632
© S633
©S634
eS635
eS651
°S1001
parts list.
lines.
/
: Play (» PLAY) switch
: Skip (K4< SKIP) switch
: Search (<< SEARCH) switch
: Program (PROGRAM) switch
: Disc link (DISC LINK) switch
: Skip (>| SKIP) switch
: Search (> SEARCH) switch
: Recall (RECALL) switch
: Tape side select (SIDE A/B) switch
: Random (RANDOM) switch
: Time fade (TIME FADE) switch
: Disc tray open/close (4 OPEN/CLOSE) switch
: Pause (ff! PAUSE) switch
: Repeat (REPEAT) switch
: Clear (CLEAR) switch
: Tape length (TAPE LENGTH) switch
: Time mode select (TIME MODE) switch
: Peak search (PEAK SEARCH) switch
: Level control (LEVEL +) switch
: Level control (LEVEL —) switch
: Auto cue (AUTO CUE) switch
: Power "STANDBY(Q)/ON"
: Tray open/close switch
This schematic diagram may be modified at any time with the
development of new technology.
¢ The voltage value and waveforms are the reference voltage of this
unit measured by DC electronic voltmeter (high impedance) and
oscilloscope on the basis of chassis.
Accordingly, there may arise some error in voltage values and
waveforms depending upon the internal impedance of the tester or
the measuring unit.
*The parenthesized are the values of voltage generated during
playing (Test disc 1kHz, L+R, 0dB), others are voltage values in
stop mode.
¢ Important safety notice:
Components identified by AV mark have special characteristics
important for safety. When replacing any of these components,
use only manufacturer's specified parts.
¢ The supply part number is described alone in the replacement
AOPTICAL PICKUP
FOCUS
coiL
RADIAL
MOTOR
$601: 0, S602: 1,S603: 2
S604: 3, S605: 4, S606: 5
$607: >10, S608: 10, S609: 9
S610: 8, S611: 7,S612: 6 SERVO
CIRCUIT en3se Lt __
(4)
96502 482213044121
(BC338)
IC650! NN
482220973234 Bo
(TDA8808T) So
PHOTO DICDE SIGNAL PROCESSOR
m
0
cS)
R3G22 22 (ravinay
w
nv
om ov
prep retes Pro
FOCUS
NORMALIZING |, RASER.
CIRCUIT suPP
a ae
R3565 27
(C6501
aoe
SiRCUIE
EQUALIZER
be
p_d
Sms. O.5V/DIV.
VR3569
PaK
c2sil
togoP
C2809
47P
FOCUS
OFFSET
ADJ.
(POWER, STANDBY (!) = ON) switch in "ON" position
PLAY
5 ev J
P-P
Sms 2Vv/DIV
p-P p-p (TDA8809T)
sms. 0.2V/ DIV dms Somv/piv RADIAL ERROR
s
R3559
16k
SIGNAL PROCESSOR
"fv D capse 5
16V33 BS
¥
a 7 a
' &. nx m H (TRAY)
§c oz
go
$1001
(2v) (2 sv) (2.3 (26vI 42ivi (Jive feeo,
24v 24av av tiv 06V 06v 4ev 3s6V
@ @ GC
|
|
i
PLAY PLAY 1€6503 E —_}———_
NVV\. ig 5v
wedi {!50mv 482220973235
D o"
a
C2536
0.033
033
0.
2 pemmenees | 2 ed ro
1C6503
e
c2540
50V0.68
1c6504
482220972587
(TCAO372DP2)
FOCUS/RADIAL DRIVE
-—-—-- : Positive voltage lines and negative voltage
Audio signal lines.
O.5ms. 2V/DIV.
-9 4v—
sits : -18-
To main circuit
on page 20
To main circuit
on page 20