Technics SL-PJ28 - Page 17

SL-PJ28 |
Hi SCHEMATIC DIAGRAM (Parts list on pages 42~45.)
(This schematic diagram may be modified at any time with development of new technology.)
Note:
¢
Important
safety
notice:
¢
$601
:
Disc
holder
open/close
(A
OPEN/CLOSE)
switch.
Components
identified
by
A,
mark
have
special
e
$602
:
Stop
(J
STOP)
switch.
characteristics
important
for
safety.
When
replacing
e
$603
:
Pause
(9
PAUSE)
switch.
any
of
these components,
use
only
manufacturer's
~
°
$604
:
Play
(>
PLAY)
switch.
specified
parts.
hea}
2
_
9
$605,
606
=
Skip
(Hdd
SKIP
PD)
switches.
.......
The
supply.
part
number
is
described
alone in
the
Ta
(8805:
Kad,
S606:
DPI]
~o
replacement
parts
list.
““e $607, 608 : Search (<< SEARCH PP) switches.
[S607: <4, S608: PP]
Original Part No. Supply Part No.
¢ $609 : Repeat play (REPEAT) switch.
¢ $610 : Soma (PROGRAM) switch.
° $611 _ 1: Power (STANDBY © /ON) switch.
© $612 : Edit mode (NORMAL, TAPE LENGTH) switch.
¢ $613 : Tape side select (SIDE A/B) switch. . -- ws CC _——ee {| seems : Positive voltage lines and
2 5614 : Random play (RANDOM) switch. = - : negative voltage lines. . bas, A Sa ge
"
“©
$701
:
Rest
detector
switch
in
“off”
position:
—
~~
|_>
TS
guveme.
audio
signal
lines.
©.
0
0.)
““eS701A ~~ 2 Voltage adj. switch in “240V” position. ~ ED oe ween
[For (GC) area only.] Caution! os
(110V
+
127V
+
220V
—
240V)
IC
and
LSI
are
sensitive
to
static
electricity.
¢ $790 : Disc holder “close” detector switch. Secondary trouble can be prevented by taking care during
e $791 : Disc holder “open” detector switch. repair.
¢ Cover the parts boxes made of plastics with aluminum
foil.
© Ground the soldering iron.
¢ Put a conductive mat on the work table.
¢ Do not touch the pins of IC or LSI with fingers directly.
© 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. a
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.
¢ Terminal guide of IC’s, transistors and diodes
BA4558FT1 AN8800SCE2
2SC3311QRSTA
MN1554PKL1
UN4112TA
2SD2144STA
2SB1238QSTV6
MN187204PKX
UN4212TA
DTA114ESTP
2SD1862QRTV6
DTC144ESTP
.
.
Wa
Cc
B
Ce
MA700ATA
SVDMTZ8R2B
MA4039HTA
MA4330MTA
1SS254TA
MA4062MTA
SVD1SR35200V
Ca
e
MA4082MTA
Ca
Cathode
<4 Cathode
SS
Ce.
cathode
54
lla
ya
ea
wo
ea
A
A
Anode
Anode
: Anode
Anode
TRate
eyneor ,MAT10TW
Cothode
Anode a
A