(All schematic diagrams may be modified at any time with
the development of new technology)
Note :
S501 Voltage adjust switch
S601 Power switch
S602 Economi mode switch
S603 CD select switch
S604 Tuner select switch
S605 Tape select switch
S606 AUX select switch
S607 6CH discrete input select switch
S608 Play/Rec timer switch
S609 Clock /Timer switch
S611 Random switch
S612 3D AI EQ shift right switch
S613 Display/Demo switch
S614 S. Woofer switch
S615 3D AI EQ select switch
S616 Karaoke effect switch
S617 Karaoke switch
S618 3D AI EQ shift left switch
S619 3D AI EQ shift up switch
S620 3D AI EQ shift down switch
S621 CD manager select switch
S622 Disc 1 select switch
S623 Disc 1 eject switch
S624 Disc 2 select switch
S625 Disc 2 eject switch
S626 Disc 3 select switch
S627 Disc 3 eject switch
S628 Disc 4 select switch
S629 Disc 4 eject switch
S630 Disc 5 select switch
S631 Disc 5 eject switch
S640 FF/Skip switch
S641 Pause/Play switch
S642 Stop switch
S643 Rev play switch
S644 Rew/Skip switch
S645 Low ch control switch
S646 Mid ch control switch
S647 High ch control switch
S648 Tri-Amp control select switch
S649 Set AV effect switch
S651 Deck 2 open switch
S652 Rev mode select switch
S653 Rec/Stop select switch
S655 Tape edit switch
S656 Deck 1 open
S701 Reset switch
S951 Deck 1 mode detect switch
S952 Deck 1 tape detect switch
S953 Deck 1 CrO2 detect switch
S971 Deck 2 mode detect switch
S972 Deck 2 tape detect switch
S973 Deck 2 CrO2 detect switch
S974 Deck 2 record detect switch
S975 Deck 2 record detect switch
SW1 Tray position switch
SW2 Tray position switch
SW3 Tray open switch
SW4 CD offset detect switch
SW5 Spindle bottom position detect switch
• • 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.
No mark : Playback
<< >> : Rec
(( )) : CD
<> :FM
() :AM
• • Importance safety notice :
Components identified by
mark have special
characteristics important for safety. Furthermore, special
parts which have purposes of fire-retardant (resistors), high-
quality sound (capacitors), low-noise (resistors), etc. are
used. When replacing any of components, be sure to use
only manufacturer´s specified parts shown in the parts list.
Caution !
IC, LSI and VLSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during
repair.
• • Cover the parts boxes made of plastics with aluminium foil.
• • Put a conductive mat on the work table.
• • Ground the soldering iron.
• • Do not touch the pins of IC, LSI or VLSI with fingers directly.
14 Schematic Diagram
26
SA-AK78
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