Sony SRF-M73 Operating Instructions (primary... User manual

MICROFILM
SERVICE MANUAL
FM STEREO/AM PLL SYNTHESIZED RADIO
US Model
Panama Model
SPECIFICATIONS
SRF-M73
Ver 1.0 1999. 03

– 2 –
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 2
2. GENERAL ................................................................... 3
3. DISASSEMBLY ......................................................... 4
4. ELECTRICAL ADJUSTMENTS......................... 6
5. DIAGRAMS
5-1. Block Diagram ................................................................ 8
5-2. Printed Wiring Boards..................................................... 10
5-3. Schematic Diagram ......................................................... 13
5-4. IC Pin Function Description ........................................... 18
6. EXPLODED VIEWS................................................ 19
7. ELECTRICAL PARTS LIST ............................... 20
Forced Reset
The system microprocessor can be reset in the following proce-
dure.
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”.
SECTION 1
SERVICING NOTES

– 3 –
SECTION 2
GENERAL This section is extracted from
instruction manual.

– 4 –
CABINET (FRONT)/(REAR) ASSY
KEY BOARD
·This set can be disassembled in the order shown below.
SECTION 3
DISASSEMBLY
Set
Key Board Main Board Knob (A
)
Cabinet (Rear) Assy
Cabinet (Front) Assy
2 three screws
(B1.7 × 8)
2 two screws
(B1.7 × 8)
1 Remove the battery case lid
of the arrow.
3 cabinet (front) assy
4 cabinet (rear) assy
1 three claws
2 Open the key board
to direction of the arrow.
1 four claws
Note: Follow the disassembly procedure in the numerical order given.

– 5 –
MAIN BOARD
KNOB (A)
Note: Check that two switch (S1,
S2) is latched with two
adaptors when carrying
out installation.
2 screw
(B1.7
× 8)
1 Remove two solders.
3 knob (vol)
4 two claws
S1
S2
5 main board
2 two knobs (A)
1 claw
1 claw
3 two adaptors

– 6 –
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1 450 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4 530 kHz (531 kHz) 3 ± 0.1V
Confirmation 1710 kHz (1602 kHz) 9 ± 1V (8.5 ± 1V)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1 580 kHz (621 kHz)
CT1 1,490 kHz (1,395 kHz)
FM VCO VOLTAGE CONFIRMATION
Frequency Display Reading on Digital Voltmeter
87.5 MHz 3 ± 0.3V
108 MHz Less than 11 ± 1V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2 87.5 MHz
CT2 108 MHz
( ): Panama model
SECTION 4
ELECTRICAL ADJUSTMENTS
0 dB = 1 µV
[AM]
Setting:
Band switch: AM
[FM]
Setting:
Band switch: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
Adjustment Location: Main Board (See page 7)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
2 jack (J1)
set
MAIN board
TP (FM IN) 32
Ω
0.01 µ F
+
–
digital voltmete
r
MAIN board
TP (VT)
FM Free-Run Adjustment
Setting:
Procedure:
1. Connect the frequency counter toTP (MPX) as shown the fig-
ure 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
Adjustment Location: MAIN board (See page 7)
0.01 µ F
MAIN boar
d
TP (FM IN)
set
FM RF signal
generator
Carrier frequency : 98 MHz
Modulation : no modultion
Output level : 0.1 V
(
100 dB
)
+
–
MAIN board
TP (MPX)
+
1 µ F
frequency
counter
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
32 Ω
2
jack (J1)

SRF-M73
– 7 – – 8 – – 9 –
– MAIN BOARD (Component Side) –
Adjustment Location:
– MAIN BOARD (Conductor Side) –
L4
AM VCO Voltage Adjustment
RT1
FM Free-Run Adjustment
CT1
AM Tracking Adjustment
L1
AM Tracking Adjustment
T1
AM IF Adjustment
FM Tracking Adjustment
CT2
L2
TP
(MPX)
TP
(FM IN)
TP
(VT)



J1
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM
18
20
16 13
19
24 22
FM
FRONT-END FM IF AMP/
DISCRI DECODER
AMP
SWITCH
BASS
BOOST
CONTROL
POWER
AMP
DET
REGULATOR
1/2
COUNTER
1/2
COUNTER
AM IF AMP/
DET
TUNING
INDICATOR
PD1
VCO
PD2
AM
FRONT-END
14
FM RF
IN FM/AM
MIX OUT
CF3: US
CF4, 5: PANAMA
10.7MHz
CF1
10.7MHz
BASS BOOST AMP
IC2
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER,
KEY CONTROL
IC101
EEPROM
IC105
CF2
450kHz
FM
RF
26
FM DISCRI
FM
IF IN 6
721
5
1
2
14
13
L-CH
OUT
R-CH
OUT
4
27
29
123
ST IND
AM
IF IN
PILOT DET LPF2
12
TUNE IND
9
AFC1/AGC
15
BAND
SELECT
PILOT DET LPF1 PLL LPF1
PLL LPF2
VCO AM OSC FM OSC
AM RF
IN
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
RT1
FM FREE-RUN
L4
AM VCO VOLTAGE
CT2, L2
FM TRACKING
S1
FM SENS
T1
AM IF
CT1, L1
AM TRACKING
L.P.F.
B.P.F.
BPF1
FM VCO
BUFFER
Q1
FM/AM BAND
SELECT SWITCH
Q3
COMPARATOR
IC4 (1/2)
LIQUID CRYSTAL DISPLAY
LCD101
VOLTAGE
DETECT
IC102
B+ SWITCH
Q104
DC/DC
CONVERTER
Q103, T101
B+ SWITCH
Q6
AM IF
BUFFER
Q4, 5
LOW-PASS
FILTER
Q101
• SIGNAL PATH
: FM
: AM
05
POWER
AMP
MUTE
CONTROL
RIPPLE FILTER
Q2
KEY MATRIX
S101 – 111, 113 – 116
KS0 – KS3 KR0 – KR3
X101
75kHz
SYSTEM CONTROLLER (IC101),
EEPROM (IC105) B+
FM/AM TUNER (IC1),
HEADPHONE AMP (IC3) B+
BASS BOOST AMP (IC2) B+
PLL LOW-PASS FILTER CIRCUIT B+
AM IF AMP CIRCUIT B+
D105
–1
–2
IN1
IN2
HEADPHONE AMP
IC3
2
4
IN1
IN2
OUT1
OUT2
9
7
OUT1
OUT2
LP
GAIN
B+
VREF
5
67
COMPARATOR
IC4 (2/2)
3
21
B+
CT1
D1-1
L1
AM FERRITE-ROD
ANTENNA
L2
FM RF
(PANAMA)
POWER XOUT XIN
IF ON
CE
DET IN
MT/SW
REG
VCC
AM IF IN
EO
VCOL
VCOH
BAND
CMP IN
24
DATA
15
CK
14
2 1
CS
SK
3
DI
4
DO
CS
16 25 2 1 50
6
12
10
53
MUTE
5
BEEP
52
3
17212019
DX
LOCAL
S2
MEGA
BASS
ON
OFF
D1-2 D3
CT2
D2
L4
AM OSC L3
FM OSC
RV1
VOL
J1
(HEADPHONE)
2
+
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
2PCS. 3V
10 – 136 – 9
COM0 – COM3
31 – 34
SEG0 – SEG14
35 – 49

SRF-M73
– 13 – – 14 – – 15 – – 16 –
• Waveforms
– KEY Board –
1IC101 @¢ XOUT
200 mV/DIV, 10 µs/DIV
5-3. SCHEMATIC DIAGRAM • See page 17 for IC Block Diagrams.
2Q103 Base-1, Collector-2
(RADIO ON mode)
200 mV/DIV, 100 ns/DIV
3Q103 Collector-1 (RADIO ON mode)
2 V/DIV, 100 ns/DIV
208 m Vp-p
13.3
µ s
616 m Vp-p
243 ns
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 Ωand 1/4W 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
• Voltagesaretakenwith aVOM(Inputimpedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
f: AM
FM FREE-RUN

– 21 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
R134 1-216-097-00 RES, CHIP 100K 5% 1/10W
R135 1-216-097-00 RES, CHIP 100K 5% 1/10W
R136 1-216-089-00 RES, CHIP 47K 5% 1/10W
R137 1-216-017-00 RES, CHIP 47 5% 1/10W
R138 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R139 1-216-845-11 METAL CHIP 100K 5% 1/16W
R140 1-216-833-11 RES, CHIP 10K 5% 1/16W
R141 1-216-821-11 METAL CHIP 1K 5% 1/16W
R171 1-216-833-11 RES, CHIP 10K 5% 1/16W
R172 1-216-833-11 RES, CHIP 10K 5% 1/16W
R173 1-216-833-11 RES, CHIP 10K 5% 1/16W
R174 1-216-833-11 RES, CHIP 10K 5% 1/16W
R176 1-216-049-11 RES, CHIP 1K 5% 1/10W
R177 1-216-049-11 RES, CHIP 1K 5% 1/10W
< SWITCH >
S113 1-572-499-11 SWITCH, TACTIL (POWER)
S114 1-572-499-11 SWITCH, TACTIL (HOLD)
S115 1-572-499-11 SWITCH, TACTIL (STRT/STOP)
S116 1-572-499-11 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 1-163-141-00 CERAMIC CHIP 0.001uF 5% 50V
C2 1-163-141-00 CERAMIC CHIP 0.001uF 5% 50V
C3 1-163-092-00 CERAMIC CHIP 9PF 0.25PF 50V
C4 1-162-908-11 CERAMIC CHIP 3PF 0.25PF 50V
C5 1-163-809-11 CERAMIC CHIP 0.047uF 10% 25V
C6 1-163-131-00 CERAMIC CHIP 390PF 5% 50V
C7 1-163-231-11 CERAMIC CHIP 15PF 5% 50V
C8 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C9 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C10 1-126-157-11 ELECT 10uF 20% 16V
C11 1-126-157-11 ELECT 10uF 20% 16V
C12 1-126-162-11 ELECT 3.3uF 20% 50V
C13 1-113-619-11 CERAMIC CHIP 0.47uF 10V
C14 1-135-181-21 TANTALUM CHIP 4.7uF 20% 6.3V
C16 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C17 1-164-156-11 CERAMIC CHIP 0.1uF 25V
C18 1-135-259-11 TANTALUM CHIP 10uF 20% 6.3V
C19 1-164-346-11 CERAMIC CHIP 1uF 16V
C20 1-135-181-21 TANTALUM CHIP 4.7uF 20% 6.3V
C21 1-124-584-00 ELECT 100uF 20% 10V
C22 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C23 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C24 1-164-227-11 CERAMIC CHIP 0.022uF 10% 25V
C25 1-164-346-11 CERAMIC CHIP 1uF 16V
C26 1-164-336-11 CERAMIC CHIP 0.33uF 25V
C27 1-164-336-11 CERAMIC CHIP 0.33uF 25V
C28 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C29 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C30 1-163-809-11 CERAMIC CHIP 0.047uF 10% 25V
C31 1-104-912-11 TANTALUM CHIP 3.3uF 20% 6.3V
C32 1-126-162-11 ELECT 3.3uF 20% 50V
C33 1-126-157-11 ELECT 10uF 20% 16V
C34 1-164-336-11 CERAMIC CHIP 0.33uF 25V
C35 1-164-336-11 CERAMIC CHIP 0.33uF 25V
C36 1-163-229-11 CERAMIC CHIP 12PF 5% 50V
C37 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C38 1-111-253-11 TANTALUM CHIP 100uF 20% 6.3V
C39 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C40 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C41 1-127-569-91 TANTALUM CHIP 100uF 20% 4V
C42 1-124-434-00 ELECT 220uF 20% 4V
C43 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C44 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C45 1-124-584-00 ELECT 100uF 20% 10V
C46 1-124-584-00 ELECT 100uF 20% 10V
C47 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C48 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C49 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C50 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C52 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C54 1-135-259-11 TANTALUM CHIP 10uF 20% 6.3V
C55 1-126-518-11 ELECT 470uF 20% 4V
C56 1-126-518-11 ELECT 470uF 20% 4V
C57 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C58 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
C59 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C60 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C62 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C63 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C64 1-163-251-11 CERAMIC CHIP 100PF 5% 50V
C65 1-162-927-11 CERAMIC CHIP 100PF 5% 50V
C73 1-162-970-11 CERAMIC CHIP 0.01uF 10% 25V
C74 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C75 1-164-004-11 CERAMIC CHIP 0.1uF 10% 25V
< FILTER >
CF1 1-760-237-11 FILTER, CERAMIC
CF2 1-579-638-11 FILTER, CERAMIC
CF3 1-760-237-11 FILTER, CERAMIC (US)
CF4 1-760-237-11 FILTER, CERAMIC (Panama)
CF5 1-760-233-71 FILTER, CERAMIC (Panama)
< TRIMMER >
CT1 1-141-298-11 CAP, TRIMMER 10PF
CT2 1-141-298-11 CAP, TRIMMER 10PF
< DIODE >
D1 8-719-072-59 DIODE SVC347S-TL
KEY MAIN

– 22 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
D2 8-713-100-11 DIODE 1T362
D3 8-713-100-11 DIODE 1T362
< IC >
IC1 8-752-062-48 IC CXA1238M-T6
IC2 8-759-380-15 IC LA3550MTP-1
IC3 8-759-802-75 IC LA4533M
IC4 8-759-510-73 IC BA10393F-E2
< SHORT >
JC1 1-216-296-00 SHORT 0 (Panama)
< JACK >
J1 1-563-298-11 JACK (SMALL TYPE) (DIA. 3.5) (2)
< COIL >
L1 1-754-057-11 ANTENNA, FERRITE-ROD (AM)
L2 1-416-444-11 COIL, AIR-CORE
L3 1-414-690-21 INDUCTOR 82nH
L4 1-406-269-11 COIL (OSC)
L6 1-412-947-11 INDUCTOR 4.7uH
L7 1-412-947-11 INDUCTOR 4.7uH
L8 1-412-947-11 INDUCTOR 4.7uH
L9 1-412-959-11 INDUCTOR 47uH
< TRANSISTOR >
Q1 8-729-102-07 TRANSISTOR 2SC2223-F13
Q2 8-729-120-28 TRANSISTOR 2SC1623-L5L6
Q3 8-729-905-35 TRANSISTOR 2SC4081-R
Q4 8-729-905-35 TRANSISTOR 2SC4081-R
Q5 8-729-905-35 TRANSISTOR 2SC4081-R
Q6 8-729-141-48 TRANSISTOR 2SB624-BV345
< RESISTOR >
R1 1-216-097-00 RES, CHIP 100K 5% 1/10W
R2 1-216-097-00 RES, CHIP 100K 5% 1/10W
R3 1-216-073-00 METAL CHIP 10K 5% 1/10W
R4 1-216-057-00 METAL CHIP 2.2K 5% 1/10W
R5 1-216-837-11 METAL CHIP 22K 5% 1/16W
R6 1-216-121-00 RES, CHIP 1M 5% 1/10W
R7 1-216-813-11 METAL CHIP 220 5% 1/16W
R8 1-216-821-11 METAL CHIP 1K 5% 1/16W
R10 1-216-832-11 METAL CHIP 8.2K 5% 1/16W
R11 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R12 1-216-849-11 METAL CHIP 220K 5% 1/16W
R13 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R14 1-216-033-00 METAL CHIP 220 5% 1/10W
R16 1-216-001-00 METAL CHIP 10 5% 1/10W
R17 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R18 1-216-827-11 METAL CHIP 3.3K 5% 1/16W
R19 1-216-849-11 METAL CHIP 220K 5% 1/16W
R20 1-216-065-00 RES, CHIP 4.7K 5% 1/10W
R21 1-216-101-00 METAL CHIP 150K 5% 1/10W
R22 1-216-101-00 METAL CHIP 150K 5% 1/10W
R23 1-216-845-11 METAL CHIP 100K 5% 1/16W
R24 1-216-821-11 METAL CHIP 1K 5% 1/16W
R25 1-216-833-11 RES, CHIP 10K 5% 1/16W
R26 1-216-833-11 RES, CHIP 10K 5% 1/16W
R27 1-216-821-11 METAL CHIP 1K 5% 1/16W
R28 1-216-821-11 METAL CHIP 1K 5% 1/16W
R30 1-216-073-00 METAL CHIP 10K 5% 1/10W
R31 1-216-073-00 METAL CHIP 10K 5% 1/10W
R32 1-216-093-00 RES, CHIP 68K 5% 1/10W
R33 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R34 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R35 1-216-845-11 METAL CHIP 100K 5% 1/16W
R36 1-216-825-11 METAL CHIP 2.2K 5% 1/16W
R37 1-216-809-11 METAL CHIP 100 5% 1/16W
R38 1-216-845-11 METAL CHIP 100K 5% 1/16W
R39 1-216-817-11 METAL CHIP 470 5% 1/16W
R40 1-216-805-11 METAL CHIP 47 5% 1/16W
R41 1-216-809-11 METAL CHIP 100 5% 1/16W
R43 1-216-797-11 METAL CHIP 10 5% 1/16W
R44 1-216-097-00 RES, CHIP 100K 5% 1/10W
R45 1-216-095-00 METAL CHIP 82K 5% 1/10W
R46 1-216-845-11 METAL CHIP 100K 5% 1/16W
R47 1-216-845-11 METAL CHIP 100K 5% 1/16W
< VARIABLE RESISTOR >
RT1 1-238-663-11 RES, ADJ, CARBON 4.7K
RV1 1-237-352-21 RES, BAR, CARBON 20K/20K (VOL)
< SWITCH >
S1 1-570-675-11 SWITCH, SLIDE (FM SENS)
S2 1-570-675-11 SWITCH, SLIDE (MEGA BASS)
< TRANSFORMER >
T1 1-404-444-31 TRANSFORMER, IF
************************************************************
MISCELLANEOUS
***************
2 1-771-677-21 SWITCH, RUBBER KEY
************************************************************
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
MAIN
SRF-M73
Sony Corporation
Personal A&V Products Company
9-926-979-11
99C0539-1
Printed in Japan © 1999. 3
Published by Quality Engineering Dept.
(Shinagawa)