Sharp QT-90W, Service Manual

Page: 9 / 20

QT-90W
– 9 –
NOTES ON SCHEMATIC DIAGRAM
TYPES OF TRANSISTOR AND LED
•
Resistor:
To differentiate the units of resistors, such 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
ohm-type resistor. Besides, the one with “Fusible” is a fuse
type.
•
Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means pico-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
• 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.
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
S101 BAND SELECTOR FM—MW—SW1—SW2
S201 RECORD/PLAYBACK REC—P.B.
S301 FUNCTION/ LINE
BEAT CANCEL
S501 VOLTAGE SELECTOR AC 220-240 V—
AC 110-127 V
SW501 SURROUND OFF—ON
SW601 TAPE MAIN OFF—ON
REF. NO
DESCRIPTION POSITION
VOLTAGE
E C B
FRONT
VIEW
2SC945
SS8550
E B C
FRONT
VIEW
3DA8050
FRONT
VIEW
FRONT
VIEW
CSL-326G3GTH
523HD
IC101: LA1186N [FM]
Pin No.
Voltage
IC201: BA3313L [PLAYBACK]
Pin No.
Voltage
IC102: LA1805 [FM]
Pin No.
Voltage
Pin No.
Voltage
IC102: LA1805 [MW/SW1/SW2]
Pin No.
Voltage
Pin No.
Voltage
IC401/IC402: BA5415A
Pin No.
Voltage
Q603: SS8550
Pin No.
Voltage
Q602: SS8550
Pin No.
Voltage
Q205: 2SC945
Pin No.
Voltage
Q303: 2SC945
Pin No.
Voltage
Q304: 2SC945
Pin No.
Voltage
Q209: 2SC945
Pin No.
Voltage
Q301: 2SC945
Pin No.
Voltage
Q305/Q306: 2SC945
Pin No.
Voltage
Q201: 3DA8050
Pin No.
Voltage
Q601: 3DA8050
Pin No.
Voltage
IC201: BA3313L [REC]
Pin No.
Voltage
1.5V 1.5V 5.5V 2.2V 1.5V 0V 0V 0V 2V 2V 4.8V 0.8V
1 2 3 4 5 6 7 8 9 10 11 12
0.9V 1.5V 5.3V 0V 0V 5.3V 0V 4.7V 5.3V
1 2 3 4 5 6 7 8 9
1.55V 1.55V 6.7V 0.8V 1.55V 0V 0V 0V 2V 2V 6.5V 0.8V
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
2.7V 0.25V 6.6V 0V 6.9V 0V 0V 0V 0V 5.2V 0V 3V
2.8V 0.26V 6.4V 0V 6.8V 0V 0V 0V 0V 0.265V 0V 3V
1 2 3 4 5 6 7 8 9 10 11 12
15V 7.7V 15V 0.6V 5V 5.2V 15V 0V 0.6V 15V 7.8V 0V
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3
E: 17V C: 17V B: 0V
1 2 3
E: 0V C: 3.5V B:0.5V
1 2 3
E: 0V C: 0V B: 5V
1 2 3
E: 0V C: 4V B:0.7V
1 2 3
E: 7V B: 6.7V C:7.6V
1 2 3
E: 17V C: 17V B:17V
1 2 3
E: 0V C: 0V B: 5V
1 2 3
E: 0V C: 0V B: 5V
1 2 3
E: 0V C: 4V B:0.7V
1 2 3
E:7.5V B:17V C:8.2V
0V 1.65V 1.1V 1.2V 1.65V 0.8V 0.55V 6.7V 6.5V 1.6V 1.6V 1.6V
13 14 15 16 17 18 19 20 21 22 23 24
1.1V 1.5V 1.5V 1.2V 2.3V 0.22V 0.12V 5.5V 5.5V 0V 1.6V 0.8V
13 14 15 16 17 18 19 20 21 22 23 24
Q207: SS8550
Pin No.
Voltage
1 2 3
E: 7.5V C: 7.5V B: 0V