RQ-SX79GK, RQ-SX79GD - Panasonic Audio Service Manual (repair manual). Page 11

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7 Block Diagram
IC2
JK1
HEADPHONE
IC3
SYSTEM
CONTROL
IC1
MOTOR
DRIVE
MOTOR
M
BATT.
PRE
AMP
PLAYBACK
HEAD
POWER
AMP
SOLENOID
SOLENOID
DRIVE
Q5,6
VDD
IC5
REGULATOR
Q1,3
Z1
TAPE
END
DET .
VR3
(VOLUME)
VR2
(TAPE SPEED ADJ.)
TP17
VOLT.
COMP.
POWER
SUPPLY
Q4
TP37
TP33,34
(
TP35,36
)
IC4
RESET
REM
RQ-SX79(GK/GD) Block Diageram
Vcc
Notes
   (      ):Indicates pin No. Right channel.
:Playback signal line.
8 Check Point of Signal
9 Schematic Diagram Notes
     ·    This schematic diagram may be modified at any time
with the development of new technology.
Notes:
SW1:
Cassette half detect switch. (IN...ON, OUT...OFF)
SW2:
S-XBS /A-B repeatswitch.
SW3:
FWD/REV/STOP detect switch in “FWD” position.
SW4:
HOLD/BATT CHK switch.
SW5:
Stop,Playback/direction switch (
/
)
SW6:
REW/- switch.(REW)
SW7:
FF/+ switch. (FF)
VR1:
Tape speed adjustment VR.
VR2:
Volume control VR. (VOLUME)
     ·    DC voltage measurements are taken with electronics
voltmeter
     ·    From negative terminal of battery. No mark...Fast Forward
(FF) mode.
Current consumption of tape playback (FWD)
     ·    Volume VR MAX......49mA.
Volume VR MIN.......43mA.
     ·    Signal line
: Positive voltage line
: Playback signal line
11
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