Technics SL-HD301 - 9 Schematic Diagram Notes; 9.1. Scheamtic Diagram Notes; 9.2. Type Illustration of ICs, Transistors and Diodes

SL-HD301 / SL-HD501
9 Schematic Diagram Notes
9.1. Scheamtic Diagram Notes
This schematic diagram may be modified at any time with the Important safety notice:
development of new technology. Components identified by A\ mark have special
characteristics important for safety.
Notes: Furthermore, special parts which have purpose of
e S701 : Rest position detect switch. fire-retardant (resistors), high-quality sound
(capacitors), low-noise (resistors), etc. are used.
$790 :C itch.
. Ey Sey: openewito When replacing any of components, be sure to use
¢ S791 : CD tray close switch. only manufacture’s specified parts shown in the
e S801 : Stop (fH) switch. parts list.
e $802 : Play (> ) switch. Caution!
e S803 : Pause (ff) switch. iC and LSI are sensitive to static electricity.
e S804 : CD tray open/close (4 OPEN/CLOSE) Secondary trouble can be prevented by taking
switch. care during repair.
e S805 : F. skip/ search ( >> / PP) switch Cover the parts boxes made of plastics with
e S806 : R. skip/ search (H@<q / <q) switch. aluminum foil.
e S807 : CD text select (CD TEXT) switch. Ground the soldering iron.
e S808 : Al edit (Al EDIT) switch. Put a conductive mat on the work table.
e $809 : Scroll (SCROLL) switch. Do not touch the legs of IC or LS! with the fingers
e Indicated voltage values are the standard values for directly.
the unit measured by the DC electronic circuit tester Voltage and signal line
(high-impedance) with the chassis taken as =p== =: Positive voltage line
standard. Therefore, there may exist some errors in <> : CD signal line
the voltage values, depending on the _ internal
impedance of the DC circuit tester.
No mark: CD STOP
(): CD play [1kHz, L+R, 0dB]
9.2. Type Illustration of IC’s, Transistors and Diodes
LC66358C4K97 MN662790RSA TA7291S
AN8739SBE2 TC74HCT7007A
AN8839NSBE2
24
LM2940T5SM UPC29M33T TOTX178
2SB709STX
é 28C4081STX
SP DTA143XUT106
LE DTC114YUT106
'
A
DTC143EUT106
DTC143XUA106
MA8082MTX
MA8039LTX
Cathode
&
A
SPR-30SMDTF
Anode
A_ Cathode Anode