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SRF-M73
SERVICE MANUAL
Ver 1.0 1999. 03
US Model Panama Model
SPECIFICATIONS
FM STEREO/AM PLL SYNTHESIZED RADIO
MICROFILM
SECTION 1 SERVICING NOTES
TABLE OF CONTENTS 1. 2. 3. 4. 5.
5-1. 5-2. 5-3. 5-4. Forced Reset The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be worked normally due to the overrunning of the microprocessor, etc. Procedure: 1. Set to radio OFF. 2. While pressing the [SCAN] button, press two buttons of [START/ STOP] and [BAND] simultaneously for 5 seconds. 3. The unit is reset, and display blinking "AM 12:00".
SERVICING NOTES ............................................... 2 GENERAL ................................................................... 3 DISASSEMBLY ......................................................... 4 ELECTRICAL ADJUSTMENTS ......................... 6 DIAGRAMS
Block Diagram ................................................................ Printed Wiring Boards ..................................................... Schematic Diagram ......................................................... IC Pin Function Description ........................................... 8 10 13 18
6. 7.
EXPLODED VIEWS ................................................ 19 ELECTRICAL PARTS LIST ............................... 20
2
SECTION 2 GENERAL
This section is extracted from instruction manual.
3
SECTION 3 DISASSEMBLY
· This set can be disassembled in the order shown below.
Set
Cabinet (Front) Assy
Cabinet (Rear) Assy
Key Board
Main Board
Knob (A)
Note: Follow the disassembly procedure in the numerical order given.
CABINET (FRONT)/(REAR) ASSY
2 three screws (B1.7 × 8)
1 Remove the battery case lid of the arrow.
2 two screws (B1.7 × 8)
4 cabinet (rear) assy
3 cabinet (front) assy
KEY BOARD
1 three claws
2 Open the key board to direction of the arrow.
1 four claws
4
MAIN BOARD
Note: Check that two switch (S1, S2) is latched with two adaptors when carrying out installation.
3 knob (vol)
5 main board 4 two claws
S2
S1
2 screw (B1.7 × 8)
1 Remove two solders.
KNOB (A)
2 two knobs (A) 1 claw
1 claw
3 two adaptors
5
SECTION 4 ELECTRICAL ADJUSTMENTS
0 dB = 1 µV
[AM] Setting: Band switch: AM
AM RF signal generator Put the lead-wire antenna close to the set. 32 set 30% amplitude 2 jack (J1) modulation by 400 Hz signal Output level: as low as possible + level meter
T1 AM IF ADJUSTMENT Adjust for a maximum reading on level meter 450 kHz AM VCO VOLTAGE ADJUSTMENT Adjustment Part L4 Confirmation Frequency Display 530 kHz (531 kHz) 1710 kHz (1602 kHz) Reading on Digital Voltmeter 3 ± 0.1V 9 ± 1V (8.5 ± 1V)
AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L1 CT1 580 kHz (621 kHz) 1,490 kHz (1,395 kHz) FM VCO VOLTAGE CONFIRMATION Frequency Display Reading on Digital Voltmeter 3 ± 0.3V Less than 11 ± 1V
[FM] Setting: Band switch: FM
FM RF signal generator 0.01 µF set 22.5 kHz frequency deviation by 400 Hz signal Output level: as low as possible
2 jack (J1)
MAIN board TP (FM IN) 32
level meter +
L2 CT2 (
87.5 MHz 108 MHz
FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter 87.5 MHz 108 MHz
): Panama model
· Repeat the procedures in each adjustment several times, and the tracking adjustments should be finally done by the trimmer capacitors.
digital voltmeter MAIN board TP (VT)
FM Free-Run Adjustment Setting:
FM RF signal generator 0.01 µF MAIN board TP (FM IN) set Carrier frequency : 98 MHz Modulation : no modultion Output level : 0.1 V (100 dB)
+
Adjustment Location: Main Board (See page 7)
Procedure: 1. Connect the frequency counter to TP (MPX) as shown the figure below. 2. Tune the set to 98 MHz. 3. Adjust RT1 for 76 kHz reading on the frequency counter. Specification: 75.8 kHz to 76.2 kHz
frequency counter MAIN board TP (MPX) 1 µF
+ +
Adjustment Location: MAIN board (See page 7)
6
SRF-M73 SECTION 5 DIAGRAMS
Adjustment Location: MAIN BOARD (Component Side) MAIN BOARD (Conductor Side)
CF1 10.7MHz 26 FM DISCRI FM/AM FRONT-END, FM/AM DET, MPX IC1 FM RF IN FM/AM MIX OUT CF3: US CF4, 5: PANAMA 10.7MHz 16 13 FM IF IN
5-1.
BLOCK DIAGRAM
VREF 21 REG 7 VCC
B+
BASS BOOST AMP IC2 RV1 L-CH OUT DECODER AMP VOL 6 1 IN1 OUT1 14 1 5 2 IN2 OUT2 2
HEADPHONE AMP IC3
S1 FM SENS B.P.F. BPF1 DX LOCAL (PANAMA) L2 FM RF D2 CT2, L2 FM TRACKING L1 AM FERRITE-ROD ANTENNA D1-1 CT2 19 20 18
REGULATOR
IN1
FM FRONT-END
FM IF AMP/ DISCRI
POWER AMP
OUT1
9
R-CH OUT
FM RF
T1 AM IF CF2 450kHz 14 AM IF IN
TUNING INDICATOR 1/2 COUNTER 1/2 COUNTER PILOT DET LPF1
13 2
4
IN2
POWER AMP MUTE CONTROL
OUT2
7
SWITCH PD1 BASS BOOST CONTROL ST IND VCO PLL LPF1 PLL LPF2 VCO DET DET IN LP GAIN 6 ON OFF S2 MEGA BASS MT/SW 10
AM RF IN
AM IF AMP/ DET
AM FRONT-END AM OSC FM OSC AM IF BUFFER Q4, 5 AFC1/AGC TUNE IND
PD2 PILOT DET LPF2
4
L4 AM VCO Voltage Adjustment
TP (VT)
CT1, L1 AM TRACKING
CT1 L4 AM VCO VOLTAGE
BAND SELECT 15
12
24
22
12
9
3
2
1 L.P.F.
29
27
RT1 FM Free-Run Adjustment CT1 AM Tracking Adjustment L1 AM Tracking Adjustment CT2 FM Tracking Adjustment L2
TP (MPX)
L4 AM OSC D1-2 D3
L3 FM OSC
B+ FM/AM BAND SELECT SWITCH Q3 5 6 COMPARATOR IC4 (1/2) RT1 FM FREE-RUN
+
7
LOW-PASS FILTER Q101
FM VCO BUFFER Q1
J1 2 (HEADPHONE)
3 2 COMPARATOR IC4 (2/2) 1
19 EO
20 VCOL
21 VCOH
17 AM IF IN
3 BAND
53 CMP IN
5 MUTE
52 BEEP 50 VOLTAGE DETECT IC102 CE DRY BATTERY SIZE "AAA" (IEC DESIGNATION R03) 2PCS. 3V B+ SWITCH Q104
TP (FM IN)
KS0 KS3 69
KR0 KR3 10 13
COM0 COM3 31 34
SEG0 SEG14 35 49
15
14 16
24
25
X101 75kHz LIQUID CRYSTAL DISPLAY LCD101
J1
T1 AM IF Adjustment
KEY MATRIX S101 111, 113 116
POWER IF ON 2 1
SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL IC101
XOUT
DATA
XIN
CK
CS
3 DI
4 DO
2 SK
1 CS
SYSTEM CONTROLLER (IC101), EEPROM (IC105) B+ FM/AM TUNER (IC1), HEADPHONE AMP (IC3) B+
EEPROM IC105
BASS BOOST AMP (IC2) B+
RIPPLE FILTER Q2 D105 DC/DC CONVERTER Q103, T101
PLL LOW-PASS FILTER CIRCUIT B+
AM IF AMP CIRCUIT B+
B+ SWITCH Q6
· SIGNAL PATH : FM : AM
05
7
8
9
5-3.
SCHEMATIC DIAGRAM
· See page 17 for IC Block Diagrams.
· Waveforms KEY Board
1 IC101 @¢ XOUT 200 mV/DIV, 10 µs/DIV
SRF-M73
208 m Vp-p
13.3 µs
2 Q103 Base-1, Collector-2 (RADIO ON mode) 200 mV/DIV, 100 ns/DIV
616 m Vp-p
FM FREE-RUN
243 ns
3 Q103 Collector-1 (RADIO ON mode) 2 V/DIV, 100 ns/DIV
4.9 Vp-p
243 ns
Note on Schematic Diagram: · All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums. · All resistors are in and 1/4 W or less unless otherwise specified. ¢ · : internal component. · C : panel designation. · U : B+ Line. · H : adjustment for repair. · Power voltage is dc 3 V and fed with regulated dc power supply from battery terminal. · Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : FM ( ) : AM · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. · Circled numbers refer to waveforms. · Signal path. F : FM f : AM
13
14
15
16
KEY
Ref. No. R134 R135 R136 R137 R138 R139 R140 R141 R171 R172 R173 R174 R176 R177 Part No. 1-216-097-00 1-216-097-00 1-216-089-00 1-216-017-00 1-216-825-11 1-216-845-11 1-216-833-11 1-216-821-11 1-216-833-11 1-216-833-11 1-216-833-11 1-216-833-11 1-216-049-11 1-216-049-11 Description RES, CHIP RES, CHIP RES, CHIP RES, CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP RES, CHIP RES, CHIP RES, CHIP RES, CHIP RES, CHIP RES, CHIP < SWITCH > S113 S114 S115 S116 1-572-499-11 1-572-499-11 1-572-499-11 1-572-499-11 SWITCH, TACTIL (POWER) SWITCH, TACTIL (HOLD) SWITCH, TACTIL (STRT/STOP) SWITCH, TACTIL (LAP/RESET) < TRANSFOMER > T101 1-449-138-71 TRANSFORMER, DC-DC CONVERTER < VIBRATOR > X101 1-767-517-11 VIBRATOR, CRYSTAL (75kHz) ************************************************************ * * A-3663-262-A MAIN BOARD, COMPLETE (US) A-3663-288-A MAIN BOARD, COMPLETE (Panama) ********************* 3-033-937-01 HOLDER (BAR ANT) < BAND PASS FILTER > BPF1 1-235-171-00 FILTER, BAND PASS < CAPACITOR > C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C16 C17 C18 C19 C20 C21 1-163-141-00 1-163-141-00 1-163-092-00 1-162-908-11 1-163-809-11 1-163-131-00 1-163-231-11 1-163-251-11 1-163-021-11 1-126-157-11 1-126-157-11 1-126-162-11 1-113-619-11 1-135-181-21 1-162-970-11 1-164-156-11 1-135-259-11 1-164-346-11 1-135-181-21 1-124-584-00 CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT ELECT ELECT CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP TANTALUM CHIP ELECT 0.001uF 0.001uF 9PF 3PF 0.047uF 390PF 15PF 100PF 0.01uF 10uF 10uF 3.3uF 0.47uF 4.7uF 0.01uF 0.1uF 10uF 1uF 4.7uF 100uF 5% 5% 0.25PF 0.25PF 10% 5% 5% 5% 10% 20% 20% 20% 20% 10% 50V 50V 50V 50V 25V 50V 50V 50V 50V 16V 16V 50V 10V 6.3V 25V 25V 6.3V 16V 6.3V 10V C59 C60 C62 C63 C64 C65 C73 C74 C75 1-163-021-11 1-162-927-11 1-162-927-11 1-162-927-11 1-163-251-11 1-162-927-11 1-162-970-11 1-163-021-11 1-164-004-11 CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP < FILTER > CF1 CF2 CF3 CF4 CF5 1-760-237-11 1-579-638-11 1-760-237-11 1-760-237-11 1-760-233-71 FILTER, CERAMIC FILTER, CERAMIC FILTER, CERAMIC (US) FILTER, CERAMIC (Panama) FILTER, CERAMIC (Panama) < TRIMMER > CT1 CT2 1-141-298-11 CAP, TRIMMER 10PF 1-141-298-11 CAP, TRIMMER 10PF < DIODE > D1 8-719-072-59 DIODE SVC347S-TL 0.01uF 100PF 100PF 100PF 100PF 100PF 0.01uF 0.01uF 0.1uF 10% 5% 5% 5% 5% 5% 10% 10% 10% C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C52 C54 C55 C56 C57 C58 1-163-009-11 1-111-253-11 1-163-251-11 1-163-251-11 1-127-569-91 1-124-434-00 1-164-004-11 1-164-004-11 1-124-584-00 1-124-584-00 1-163-021-11 1-162-970-11 1-163-021-11 1-162-970-11 1-162-970-11 1-135-259-11 1-126-518-11 1-126-518-11 1-163-009-11 1-164-004-11 CERAMIC CHIP TANTALUM CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP ELECT CERAMIC CHIP CERAMIC CHIP ELECT ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP ELECT ELECT CERAMIC CHIP CERAMIC CHIP 0.001uF 100uF 100PF 100PF 100uF 220uF 0.1uF 0.1uF 100uF 100uF 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF 10uF 470uF 470uF 0.001uF 0.1uF 10% 20% 5% 5% 20% 20% 10% 10% 20% 20% 10% 10% 10% 10% 10% 20% 20% 20% 10% 10% 100K 100K 47K 47 2.2K 100K 10K 1K 10K 10K 10K 10K 1K 1K 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% Remark 1/10W 1/10W 1/10W 1/10W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/10W 1/10W Ref. No. C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 Part No. 1-164-004-11 1-164-227-11 1-164-227-11 1-164-346-11 1-164-336-11 1-164-336-11 1-163-021-11 1-164-004-11 1-163-809-11 1-104-912-11 1-126-162-11 1-126-157-11 1-164-336-11 1-164-336-11 1-163-229-11 Description CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP TANTALUM CHIP ELECT ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP 0.1uF 0.022uF 0.022uF 1uF 0.33uF 0.33uF 0.01uF 0.1uF 0.047uF 3.3uF 3.3uF 10uF 0.33uF 0.33uF 12PF 10% 10% 10%
MAIN
Remark 25V 25V 25V 16V 25V 25V 50V 25V 25V 6.3V 50V 16V 25V 25V 50V 50V 6.3V 50V 50V 4V 4V 25V 25V 10V 10V 50V 25V 50V 25V 25V 6.3V 4V 4V 50V 25V 50V 50V 50V 50V 50V 50V 25V 50V 25V
10% 10% 10% 20% 20% 20%
5%
20% 20% 20%
21
SRF-M73 MAIN
Ref. No. D2 D3 Part No. Description Remark Ref. No. R26 R27 R28 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R43 R44 R45 R46 R47 Part No. Description 10K 1K 1K 10K 10K 68K 2.2K 2.2K 100K 2.2K 100 100K 470 47 100 10 100K 82K 100K 100K 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% Remark 1/16W 1/16W 1/16W 1/10W 1/10W 1/10W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/10W 1/10W 1/16W 1/16W 8-713-100-11 DIODE 1T362 8-713-100-11 DIODE 1T362 < IC > IC1 IC2 IC3 IC4 8-752-062-48 8-759-380-15 8-759-802-75 8-759-510-73 IC IC IC IC CXA1238M-T6 LA3550MTP-1 LA4533M BA10393F-E2 1-216-833-11 RES, CHIP 1-216-821-11 METAL CHIP 1-216-821-11 1-216-073-00 1-216-073-00 1-216-093-00 1-216-825-11 1-216-825-11 1-216-845-11 1-216-825-11 1-216-809-11 1-216-845-11 1-216-817-11 1-216-805-11 1-216-809-11 1-216-797-11 1-216-097-00 METAL CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP
< SHORT > JC1 1-216-296-00 SHORT < JACK > J1 1-563-298-11 JACK (SMALL TYPE) (DIA. 3.5) (2) < COIL > L1 L2 L3 L4 L6 L7 L8 L9 1-754-057-11 1-416-444-11 1-414-690-21 1-406-269-11 1-412-947-11 ANTENNA, FERRITE-ROD (AM) COIL, AIR-CORE INDUCTOR 82nH COIL (OSC) INDUCTOR 4.7uH 4.7uH 4.7uH 47uH 0 (Panama)
1-216-095-00 METAL CHIP 1-216-845-11 METAL CHIP 1-216-845-11 METAL CHIP
< VARIABLE RESISTOR > 1-412-947-11 INDUCTOR 1-412-947-11 INDUCTOR 1-412-959-11 INDUCTOR RT1 RV1 1-238-663-11 RES, ADJ, CARBON 4.7K 1-237-352-21 RES, BAR, CARBON 20K/20K (VOL) < SWITCH > S1 S2 1-570-675-11 SWITCH, SLIDE (FM SENS) 1-570-675-11 SWITCH, SLIDE (MEGA BASS) < TRANSFORMER > T1 1-404-444-31 TRANSFORMER, IF ************************************************************ MISCELLANEOUS *************** 100K 100K 10K 2.2K 22K 1M 220 1K 8.2K 3.3K 220K 2.2K 220 10 3.3K 3.3K 220K 4.7K 150K 150K 100K 1K 10K 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 1/10W 1/10W 1/10W 1/10W 1/16W 1/10W 1/16W 1/16W 1/16W 1/16W 1/16W 1/16W 1/10W 1/10W 1/16W 1/16W 1/16W 1/10W 1/10W 1/10W 1/16W 1/16W 1/16W 2 1-771-677-21 SWITCH, RUBBER KEY
< TRANSISTOR > Q1 Q2 Q3 Q4 Q5 Q6 8-729-102-07 8-729-120-28 8-729-905-35 8-729-905-35 8-729-905-35 TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR TRANSISTOR 2SC2223-F13 2SC1623-L5L6 2SC4081-R 2SC4081-R 2SC4081-R
8-729-141-48 TRANSISTOR 2SB624-BV345 < RESISTOR >
R1 R2 R3 R4 R5 R6 R7 R8 R10 R11 R12 R13 R14 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25
1-216-097-00 1-216-097-00 1-216-073-00 1-216-057-00 1-216-837-11 1-216-121-00 1-216-813-11 1-216-821-11 1-216-832-11 1-216-827-11 1-216-849-11 1-216-825-11 1-216-033-00 1-216-001-00 1-216-827-11 1-216-827-11 1-216-849-11 1-216-065-00 1-216-101-00 1-216-101-00
RES, CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP
************************************************************ ACCESSORIES & PACKING MATERIALS ******************************* 3-035-159-01 STRAP, HAND 3-866-487-11 MANUAL, INSTRUCTION (ENGLISH, SPANISH) (Panama) 3-866-487-21 MANUAL, INSTRUCTION (ENGLISH) (US) 8-953-142-90 HEADPHONE MDR-W14G//K SET
1-216-845-11 METAL CHIP 1-216-821-11 METAL CHIP 1-216-833-11 RES, CHIP
Sony Corporation
9-926-979-11
Personal A&V Products Company
22
99C0539-1 Printed in Japan © 1999. 3 Published by Quality Engineering Dept. (Shinagawa)