Service manual

QT-CD131/131C
– 8 –
NOTES ON SCHEMATIC DIAGRAM
1. Tuner
( ): AM mode
Marking except for ( ): FM mode
2. CD
( ): Play mode
Marking except for ( ): Stop state
3. Deck section
( ): Record mode
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
• Schematic diagram and Wiring Side of P.W.Board for this
model are subject to change for improvement without prior
notice.
• Parts marked with “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
• Resistor:
To differentiate the units of resistors, the symbol as K and M
are used: the symbol K means 1000 ohm and the symbol M
means 1000 kohm and the resistor without any symbol is an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means micro-micro-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic capacitor,
the expression “capacitance/withstand voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
SW102 RECODE/PLAYBACK OFF—ON
SW201 FUNCTION/POWER TAPE—TUNER—CD/
OFF—ON
SW203 X-BASS OFF—ON
SW501 BAND OFF—ON
SW502 TUNER DOWN OFF—ON
SW503 TUNER UP OFF—ON
SW504 MEMORY OFF—ON
SW505 PRESET UP OFF—ON
REF. NO DESCRIPTION POSITION
SW506 PRESET DOWN OFF—ON
SW601 TAPE MAIN OFF—ON
SW702 PICKUP IN OFF—ON
SW761 CD LID OPEN/CLOSE OFF—ON
SW771 PLAY/REPEAT OFF—ON
SW772 STOP OFF—ON
SW773 TRACK UP/CUE OFF—ON
SW774 TRACK DOWN/REVIEW OFF—ON
Figure 8 TYPES OF TRANSISTOR
REF. NO DESCRIPTION POSITION
ECB
(S)(G)(D)
(1) (2) (3)
FRONT
VIEW
2SA673-C
2SC1815 GR
2SC1674 K
ECB
FRONT
VIEW
S8050D
EBC
FRONT
VIEW
S9012H