Schematic Diagram; Schematic Diagram Notes - Panasonic SC-AK48 Service Manual

15 Schematic Diagram

15.1. Schematic Diagram Notes

• This schematic diagram may be modified at any time with
the development of new technology.
Notes:
• S1
: Tray position 1 detect switch in OFF position
• S2
: Tray position 2 detect switch in OFF position
• S3
: Tray open detect switch in OFF position
• S4
: Clump switch in OFF position
• S5
: Bottom switch on OFF position
• S501
: Voltage select switch (VOLT ADJ)
• S600
: Sound control jog switch (SOUND CONTROL JOG)
• S601
: TRI-AMP control switch (LOW)
• S602
: Auxiliary input switch (AUX)
• S603
: Deck1 open switch (
• S604
: CD management switch (CD MANAGER)
• S605
: Tuner/band select switch (TUNER/BAND)
• S606
: Tape edit switch (TAPE EDIT)
• S607
: Disc5 direct open/close switch (
• S608
: CD switch (CD)
• S609
: Recording start/stop switch (
• S610
: Disc direct play switch (CD5)
• S611
: Tape/deck select switch (TAPE/DECK1/2)
• S612
: Reverse mode select switch (REV MODE)
• S613
: Disc4 direct open/close switch (
• S614
: EQ down switch (
• S615
: Super woofer switch (S. WOOFER)
• S616
: Disc2 open switch (
• S617
: Disc direct play switch (CD4)
• S618
: EQ left switch (
• S619
: Display select/demonstration mode switch
(-DISPLAY/—DEMO)
• S620
: Playback, tuning, time adjust switch
( , TUNE/TIME ADJ)
• S621
: Play timer/record timer switch (
• S622
: EQ up switch (
• S623
: Disc3 direct open/close switch (
• S624
: Karaoke switch (KARAOKE)
• S625
: Clock/timer select switch (CLOCK/TIMER)
• S626
: EQ right switch (
• S627
: Disc direct play switch (CD3)
• S628
: Eco switch (MODE)
• S629
: Stop/tune mode switch (
• S630
: Disc2 direct open/close switch (
• S631
: Random play switch (RANDOM)
• S632
: FF/skip, memory switch (
• S633
: Disc2 direct play switch (CD2)
• S634
: Playback/pause, tuning, time adjust switch
, TUNE/TIME ADJ
(
• S635
: Disc1 direct open/close switch (
• S636
: Disc direct play switch (CD1)
• S637
: REW/R.skip, FM mode/beat proof switch
( , FM MODE/BP)
• S638
: Standby/on switch (
• S639
: 3D AI EQ switch (3D AI EQ)
• S640
: TRI-AMP control switch (MID)
• S641
: TRI-AMP control switch (HIGH)
• S701
: Rest switch (REST)
• S951
: Deck1 mode detect switch (MODE)
• S952
: Deck1 half detect switch (HALF)
• S953
: Deck1 CrO2 tape detect switch (ATS/CrO2)
• S971
: Deck2 mode select switch (MODE)
• S972
: Deck2 half detect switch (HALF)
• S973
: Deck2 CrO2 tape detect switch (ATS/CrO2)
DECK1 OPEN)
)
REC/STOP)
)
)
DECK2 OPEN)
)
PLAY/ REC)
)
)
)
/TUNE MODE)
)
, MEMORY)
)
)
/I)
• S974
: Deck2 reverse side record prevention tab detect switch
(R. REC. INH)
• S975
: Deck2 forward side record prevention tab detect switch
(F. REC. INH)
• VR600 : Volume control (VOLUME)
• VR601 : Microphone volume control (MIC VOL)
• Indicated voltage values are the standard values for the unit
meaured by the DC electronic circuit tester (high-
impedance) with the chassis taken as standard.
Therefore, there may exist some error in the voltage values,
depending on the internal impedance of the DC circuit
tester.
No mark ............ CD STOP
............... CD playback (1kHz, L+R, 0dB)
............... FM
............... AM
............... DECK2 playback
............... DECK2 record
• Important safety notice:
Components identified
characteristics important for safety.
Furthermore, special parts which have purposes of fire-
retardent (resistors), hight-quality sound (capacitors), low-
noise (resistors), etc. are used.
When replacing any of components, be sure to use only
manufacturers specified parts shown in the parts list.
• Caution!
IC and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during
repair.
Ground the soldering iron.
Put a conductive mat on the work table.
Do not touch the legs of IC or LSI with the fingers directly.
• *L10-L12 are printed coils formed on the P.C.B. and thus
not found in the Replacement Parts list.
• Voltage and signal line
: Positive voltage line
: Negative voltage line
: CD signal line
: FM signal line
: FM OSC signal line
: AM signal line
: AM OSC signal line
: Tape playback signal line
Tape recording signal line
: Front low SP drive signal line
: Front mid/high SP drive signal line
: Mic signal line
39
by mark have special
SA-AK48