Download SRF-M73

SRF-M73
SERVICE MANUAL
US Model
Panama Model
Ver 1.0 1999. 03
SPECIFICATIONS
FM STEREO/AM PLL SYNTHESIZED RADIO
MICROFILM
SECTION 1
SERVICING NOTES
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 2
2.
GENERAL ................................................................... 3
3.
DISASSEMBLY ......................................................... 4
4.
ELECTRICAL ADJUSTMENTS ......................... 6
5.
DIAGRAMS
5-1.
5-2.
5-3.
5-4.
Block Diagram ................................................................
Printed Wiring Boards .....................................................
Schematic Diagram .........................................................
IC Pin Function Description ...........................................
6.
EXPLODED VIEWS ................................................ 19
7.
ELECTRICAL PARTS LIST ............................... 20
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”.
8
10
13
18
–2–
SECTION 2
GENERAL
–3–
This section is extracted from
instruction manual.
SECTION 3
DISASSEMBLY
· This set can be disassembled in the order shown below.
Set
Cabinet (Front) Assy
Key Board
Cabinet (Rear) Assy
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 IF ADJUSTMENT
[AM]
Setting:
Band switch: AM
Adjust for a maximum reading on level meter
T1
AM RF signal
generator
AM VCO VOLTAGE ADJUSTMENT
Put the lead-wire
antenna close to
the set.
level meter
32 Ω
+
–
set
Adjustment Part
Frequency Display
L4
530 kHz (531 kHz)
Reading on Digital Voltmeter
3 ± 0.1V
Confirmation
1710 kHz (1602 kHz)
9 ± 1V (8.5 ± 1V)
AM TRACKING ADJUSTMENT
30% amplitude
2 jack (J1)
modulation by
400 Hz signal
Output level: as low as possible
Adjust for a maximum reading on level meter
[FM]
Setting:
Band switch: FM
L1
580 kHz (621 kHz)
CT1
1,490 kHz (1,395 kHz)
FM VCO VOLTAGE CONFIRMATION
Frequency Display
FM RF signal
generator
MAIN board
TP (FM IN)
0.01 µF
level meter
32 Ω
+
–
set
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
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
2 jack (J1)
(
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer capacitors.
L2
87.5 MHz
CT2
108 MHz
): Panama model
FM Free-Run Adjustment
Setting:
FM RF signal
generator
digital voltmeter
MAIN board
TP (VT)
450 kHz
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
5-1.
Adjustment Location:
– MAIN BOARD (Component Side) –
BLOCK DIAGRAM
– MAIN BOARD (Conductor Side) –
CF1
10.7MHz
B+
VREF
26
CF2
450kHz
14
CT2
L1
AM FERRITE-ROD
ANTENNA
19
AM RF
IN
CT1
AM TRACKING
AM IF
BUFFER
Q4, 5
FM OSC
AM OSC
TP
(VT)
CT1, L1
24
22
15
14
2
IN1
POWER
AMP
OUT1
IN2
POWER
AMP
OUT2
REG
VCC
–1
5
2
IN2
OUT2
13
4
9
7
SWITCH
AM IF AMP/
DET
BAND
SELECT
OUT1
–2
AM
FRONT-END
D1-1
L4
AM VCO Voltage Adjustment
AM
IF IN
R-CH
OUT
IN1
12
PD1
1/2
COUNTER
PD2
1/2
COUNTER
9
3
BASS
BOOST
CONTROL
ST IND
VCO
2
1
29
4
LP
GAIN
MUTE
CONTROL
S2
6
MEGA
BASS
MT/SW
AM IF
CT2, L2
FM TRACKING
TUNING
INDICATOR
T1
D2
(PANAMA)
DECODER
AMP
FM IF AMP/
DISCRI
1
ON
DET
OFF
DET
IN
FM
RF
FM
IF IN
VOL
6
VCO
LOCAL
20
13
L-CH
OUT
PLL
LPF1
L2
FM RF
16
HEADPHONE AMP
IC3
RV1
REGULATOR
PILOT DET
LPF1
DX
FM
FRONT-END
BASS BOOST AMP
IC2
PLL
LPF2
CF3: US
CF4, 5: PANAMA
10.7MHz
7
PILOT DET
LPF2
18
FM/AM
MIX OUT
AFC1/AGC
B.P.F.
BPF1
FM RF
IN
TUNE IND
S1
FM SENS
21
FM DISCRI
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
10
12
27
L4
AM VCO VOLTAGE
L.P.F.
L3
FM OSC
L4
AM OSC
FM/AM BAND
SELECT SWITCH
Q3
D1-2 D3
CT1
AM Tracking Adjustment
5
6
FM VCO
BUFFER
Q1
COMPARATOR
IC4 (2/2)
1
J1
2
(HEADPHONE)
3
VCOH
AM IF IN
BAND
10 – 13
15
14 16
24
52
COM0 – COM3
SEG0 – SEG14
CE
KR0 – KR3
6–9
5
POWER
IF ON
KS0 – KS3
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER,
KEY CONTROL
IC101
53
BEEP
17
XOUT
21
CS
20
CK
19
DATA
TP
(FM IN)
2
VCOL
CT2 
 FM Tracking Adjustment
L2 
7
3
EO
LOW-PASS
FILTER
Q101
COMPARATOR
IC4 (1/2)
XIN
L1
AM Tracking Adjustment
+
RT1
FM FREE-RUN
MUTE
TP
(MPX)
B+
CMP IN
RT1
FM Free-Run Adjustment
25
31 – 34
35 – 49
2 1
50
X101
75kHz
VOLTAGE
DETECT
IC102
4
2
1
CS
KEY MATRIX
S101 – 111, 113 – 116
3
SK
T1
AM IF Adjustment
DO
J1
DI
LIQUID CRYSTAL DISPLAY
LCD101
SYSTEM CONTROLLER (IC101),
EEPROM (IC105) B+
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
2PCS. 3V
FM/AM TUNER (IC1),
HEADPHONE AMP (IC3) B+
EEPROM
IC105
RIPPLE FILTER
Q2
BASS BOOST AMP (IC2) B+
D105
PLL LOW-PASS FILTER CIRCUIT B+
DC/DC
CONVERTER
Q103, T101
AM IF AMP CIRCUIT B+
B+ SWITCH
Q6
• SIGNAL PATH
: FM
: AM
05
–7–
–8–
–9–
B+ SWITCH
Q104
5-3.
SCHEMATIC DIAGRAM
• See page 17 for IC Block Diagrams.
SRF-M73
• Waveforms
– KEY Board –
1 IC101 @¢ XOUT
200 mV/DIV, 10 µs/DIV
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 Ω 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 MΩ).
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
MAIN
Part No.
Description
Remark
Ref. No.
Part No.
Description
R134
R135
R136
R137
1-216-097-00
1-216-097-00
1-216-089-00
1-216-017-00
RES, CHIP
RES, CHIP
RES, CHIP
RES, CHIP
100K
100K
47K
47
5%
5%
5%
5%
1/10W
1/10W
1/10W
1/10W
C22
C23
C24
C25
C26
1-164-004-11
1-164-227-11
1-164-227-11
1-164-346-11
1-164-336-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
0.1uF
0.022uF
0.022uF
1uF
0.33uF
R138
R139
R140
R141
R171
1-216-825-11
1-216-845-11
1-216-833-11
1-216-821-11
1-216-833-11
METAL CHIP
METAL CHIP
RES, CHIP
METAL CHIP
RES, CHIP
2.2K
100K
10K
1K
10K
5%
5%
5%
5%
5%
1/16W
1/16W
1/16W
1/16W
1/16W
C27
C28
C29
C30
C31
1-164-336-11
1-163-021-11
1-164-004-11
1-163-809-11
1-104-912-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
TANTALUM CHIP
0.33uF
0.01uF
0.1uF
0.047uF
3.3uF
R172
R173
R174
R176
R177
1-216-833-11
1-216-833-11
1-216-833-11
1-216-049-11
1-216-049-11
RES, CHIP
RES, CHIP
RES, CHIP
RES, CHIP
RES, CHIP
10K
10K
10K
1K
1K
5%
5%
5%
5%
5%
1/16W
1/16W
1/16W
1/10W
1/10W
C32
C33
C34
C35
C36
1-126-162-11
1-126-157-11
1-164-336-11
1-164-336-11
1-163-229-11
ELECT
ELECT
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
3.3uF
10uF
0.33uF
0.33uF
12PF
5%
50V
16V
25V
25V
50V
C37
C38
C39
C40
C41
1-163-009-11
1-111-253-11
1-163-251-11
1-163-251-11
1-127-569-91
CERAMIC CHIP
TANTALUM CHIP
CERAMIC CHIP
CERAMIC CHIP
TANTALUM CHIP
0.001uF
100uF
100PF
100PF
100uF
10%
20%
5%
5%
20%
50V
6.3V
50V
50V
4V
C42
C43
C44
C45
C46
1-124-434-00
1-164-004-11
1-164-004-11
1-124-584-00
1-124-584-00
ELECT
CERAMIC CHIP
CERAMIC CHIP
ELECT
ELECT
220uF
0.1uF
0.1uF
100uF
100uF
20%
10%
10%
20%
20%
4V
25V
25V
10V
10V
C47
C48
C49
C50
C52
1-163-021-11
1-162-970-11
1-163-021-11
1-162-970-11
1-162-970-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
0.01uF
0.01uF
0.01uF
0.01uF
0.01uF
10%
10%
10%
10%
10%
50V
25V
50V
25V
25V
C54
C55
C56
C57
C58
1-135-259-11
1-126-518-11
1-126-518-11
1-163-009-11
1-164-004-11
TANTALUM CHIP
ELECT
ELECT
CERAMIC CHIP
CERAMIC CHIP
10uF
470uF
470uF
0.001uF
0.1uF
20%
20%
20%
10%
10%
6.3V
4V
4V
50V
25V
C59
C60
C62
C63
C64
1-163-021-11
1-162-927-11
1-162-927-11
1-162-927-11
1-163-251-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
0.01uF
100PF
100PF
100PF
100PF
10%
5%
5%
5%
5%
50V
50V
50V
50V
50V
C65
C73
C74
C75
1-162-927-11
1-162-970-11
1-163-021-11
1-164-004-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
100PF
0.01uF
0.01uF
0.1uF
5%
10%
10%
10%
50V
25V
50V
25V
Ref. No.
Remark
10%
10%
10%
10%
10%
10%
20%
20%
20%
25V
25V
25V
16V
25V
25V
50V
25V
25V
6.3V
< 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
1-163-141-00
1-163-141-00
1-163-092-00
1-162-908-11
1-163-809-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
0.001uF
0.001uF
9PF
3PF
0.047uF
5%
5%
0.25PF
0.25PF
10%
50V
50V
50V
50V
25V
C6
C7
C8
C9
C10
1-163-131-00
1-163-231-11
1-163-251-11
1-163-021-11
1-126-157-11
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
CERAMIC CHIP
ELECT
390PF
15PF
100PF
0.01uF
10uF
5%
5%
5%
10%
20%
50V
50V
50V
50V
16V
C11
C12
C13
C14
C16
1-126-157-11
1-126-162-11
1-113-619-11
1-135-181-21
1-162-970-11
ELECT
ELECT
CERAMIC CHIP
TANTALUM CHIP
CERAMIC CHIP
10uF
3.3uF
0.47uF
4.7uF
0.01uF
20%
20%
16V
50V
10V
6.3V
25V
C17
C18
C19
C20
C21
1-164-156-11
1-135-259-11
1-164-346-11
1-135-181-21
1-124-584-00
CERAMIC CHIP
TANTALUM CHIP
CERAMIC CHIP
TANTALUM CHIP
ELECT
0.1uF
10uF
1uF
4.7uF
100uF
20%
10%
20%
20%
20%
25V
6.3V
16V
6.3V
10V
< 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
– 21 –
8-719-072-59 DIODE SVC347S-TL
SRF-M73
MAIN
Ref. No.
D2
D3
Part No.
Description
Remark
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
< SHORT >
JC1
1-216-296-00 SHORT
0 (Panama)
Ref. No.
Part No.
Description
Remark
R26
R27
1-216-833-11 RES, CHIP
1-216-821-11 METAL CHIP
10K
1K
5%
5%
1/16W
1/16W
R28
R30
R31
R32
R33
1-216-821-11
1-216-073-00
1-216-073-00
1-216-093-00
1-216-825-11
METAL CHIP
METAL CHIP
METAL CHIP
RES, CHIP
METAL CHIP
1K
10K
10K
68K
2.2K
5%
5%
5%
5%
5%
1/16W
1/10W
1/10W
1/10W
1/16W
R34
R35
R36
R37
R38
1-216-825-11
1-216-845-11
1-216-825-11
1-216-809-11
1-216-845-11
METAL CHIP
METAL CHIP
METAL CHIP
METAL CHIP
METAL CHIP
2.2K
100K
2.2K
100
100K
5%
5%
5%
5%
5%
1/16W
1/16W
1/16W
1/16W
1/16W
R39
R40
R41
R43
R44
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
METAL CHIP
RES, CHIP
470
47
100
10
100K
5%
5%
5%
5%
5%
1/16W
1/16W
1/16W
1/16W
1/10W
R45
R46
R47
1-216-095-00 METAL CHIP
1-216-845-11 METAL CHIP
1-216-845-11 METAL CHIP
82K
100K
100K
5%
5%
5%
1/10W
1/16W
1/16W
< JACK >
J1
1-563-298-11 JACK (SMALL TYPE) (DIA. 3.5) (2)
< COIL >
L1
L2
L3
L4
L6
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
L7
L8
L9
1-412-947-11 INDUCTOR
1-412-947-11 INDUCTOR
1-412-959-11 INDUCTOR
< VARIABLE RESISTOR >
4.7uH
4.7uH
47uH
RT1
RV1
1-238-663-11 RES, ADJ, CARBON 4.7K
1-237-352-21 RES, BAR, CARBON 20K/20K (VOL)
< TRANSISTOR >
TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANSISTOR
TRANSISTOR
< SWITCH >
Q1
Q2
Q3
Q4
Q5
8-729-102-07
8-729-120-28
8-729-905-35
8-729-905-35
8-729-905-35
2SC2223-F13
2SC1623-L5L6
2SC4081-R
2SC4081-R
2SC4081-R
Q6
8-729-141-48 TRANSISTOR 2SB624-BV345
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
************************************************************
< RESISTOR >
MISCELLANEOUS
***************
R1
R2
R3
R4
R5
1-216-097-00
1-216-097-00
1-216-073-00
1-216-057-00
1-216-837-11
RES, CHIP
RES, CHIP
METAL CHIP
METAL CHIP
METAL CHIP
100K
100K
10K
2.2K
22K
5%
5%
5%
5%
5%
1/10W
1/10W
1/10W
1/10W
1/16W
R6
R7
R8
R10
R11
1-216-121-00
1-216-813-11
1-216-821-11
1-216-832-11
1-216-827-11
RES, CHIP
METAL CHIP
METAL CHIP
METAL CHIP
METAL CHIP
1M
220
1K
8.2K
3.3K
5%
5%
5%
5%
5%
1/10W
1/16W
1/16W
1/16W
1/16W
R12
R13
R14
R16
R17
1-216-849-11
1-216-825-11
1-216-033-00
1-216-001-00
1-216-827-11
METAL CHIP
METAL CHIP
METAL CHIP
METAL CHIP
METAL CHIP
220K
2.2K
220
10
3.3K
5%
5%
5%
5%
5%
1/16W
1/16W
1/10W
1/10W
1/16W
R18
R19
R20
R21
R22
1-216-827-11
1-216-849-11
1-216-065-00
1-216-101-00
1-216-101-00
METAL CHIP
METAL CHIP
RES, CHIP
METAL CHIP
METAL CHIP
3.3K
220K
4.7K
150K
150K
5%
5%
5%
5%
5%
1/16W
1/16W
1/10W
1/10W
1/10W
R23
R24
R25
1-216-845-11 METAL CHIP
1-216-821-11 METAL CHIP
1-216-833-11 RES, CHIP
100K
1K
10K
5%
5%
5%
1/16W
1/16W
1/16W
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
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)