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SRF-H3
SERVICE MANUAL
Ver 1.0 2000. 07
Australian Model
SPECIFICATIONS
Frequency range: FM: 87.6 108 MHz AM: 530 1 710 kHz Power output: 5.0 mW + 5.0 mW (at 10 % harmonic distortion) Headphone type: Dynamic Power requirements: 1.5 V DC, one size AAA (R03) battery Mass: Approx. 132 g (4.7 oz) incl. a battery Design and specifications are subject to change without notice.
FM STEREO/AM HEADPHONE RADIO
SECTION 1 GENERAL
This section is extracted from instruction manual.
A
Head band Light reflector Support band
Getting Started
Installing the Battery
(See Fig. B) While pressing the battery compartment lid, slide it to open. 2 Insert one size AAA (R03) battery (not supplied) with correct polarity. 3 To close the lid, press and slide the lid down until it clicks.
1
FM flexible antenna
Battery compartment Driver units
When to replace the battery
Replace the battery when the sound becomes weak or distorted. Remove the old battery and insert a new one.
TUNE
POWER
Battery life (approximate hours) Sony alkaline size AAA (LR03) FM reception AM reception 80 100 Sony size AAA (R03) 40 50
Dial scale
VOL BAND
Notes on the battery
· Align the battery correctly. · The dry battery cannot be charged. · To avoid damage from possible battery leakage, remove the battery when unit will not be used for a long time.
SENS
Wearing the Radio 1 Pull out the support band fully from
B
AAA (R03) x 1
2
the headband. Adjust the headband and the support band to fit your head.
Note on the support band (See Fig. A)
When the radio not in use, put the support band back by pushing down both ends as illustrated and push it back underneath the headband.
Insert the # side of the battery first.
Note on the light reflector (See Fig. A)
This reflector reflects a car light at night for your safety.
Playing the Radio
1 2
Set POWER to ON. Set BAND to select FM or AM.
For FM, set SENS to LOCAL if interference is prevalent and reception is too strong. Under normal condition, set it to DX.
3 4
Turn TUNE (tuning) to tune in a station. Adjust the volume using VOL.
To turn off the radio
Set POWER to OFF.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer. 1. Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges. Check the interboard wiring to ensure that no wires are "pinched" or contact high-wattage resistors. Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement. Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recommend their replacement. 5. Check the B+ voltage to see it is at the values specified. 6. Flexible Circuit Board Repairing · Keep the temperature of the soldering iron around 270°C during repairing. · Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). · Be careful not to apply force on the conductor when soldering or unsoldering. 4.
2. 3.
--2--
SECTION 2 DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET FRONT (R) ASSY
2 Cabinet front (R) assy
1 Claws
Claws
Cabinet rear (R) assy
2-2. HOLDER (WITH DRIVER)
3 Holder Precision screwdriver
2 Push this portion down.
Cabinet rear (R) assy 1 Unsolder two lead wires.
2-3. GEAR (TUNING) INSTALLATION
Model name (SRF-H3)
Gear (tuning)
2
1 Turn CV1 fully in the direction of arrow.
CV1
Cabinet rear (R) assy
--3--
SECTION 3 ELECTRICAL ADJUSTMENTS
[FM] Setting: BAND switch : FM
FM RF signal generator 0.01 µF 75 kHz frequency deviation by 1 kHz signal. Output level: as low as possible FM lead wire antenna terminal
Carrier frequency: 98 MHz Modulation: no modulation Output level: 0.1 V (100 dB) FM lead wire antenna terminal
FM VCO Adjustment Procedure:
FM RF signal generator 0.01 µF
[AM] Setting: BAND switch : AM signal
AM RF signal generator Put the lead-wire antenna close to the set.
1. Connect the frequency counter to 2 and 1 pins of IC2 as shown the figure right. 2. Tune the set to 98 MHz. 3. Adjust RV1 for 76 kHz Hz reading on frequency counter. Specification Value:
Frequency counter 75,500 76,500 Hz
30% amplitude modulation by 400 Hz signal. Output level: as low as possible
Connection:
frequency counter
level meter 32 set + SP1, SP2 (speakers)
33 k
AUDIO Board IC2 Pin 1 IC2 Pin 2
+
Adjustment Location: · Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.
FM IF ADJUSTMENT Adjust for a maximum reading on level meter T2 10.7 MHz
[AUDIO BOARD] (Component Side)
FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter L4 CT1-3 87.35 MHz 108.05 MHz
IC2
RV1: MPX VCO
FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L3 CT1-2 87.35 MHz 108.05 MHz AM IF ADJUSTMENT Adjust for a maximum reading on level meter T1 455 kHz
[TUNER BOARD] (Component Side)
CT1-4: AM FREQUENCY COVERAGE CT1-1: AM TRACKING CT1-3: FM FREQUENCY COVERAGE
L2: AM TRACKING L5: AM FREQUENCY COVERAGE L3: FM TRACKING T1: AM IF
AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter L5 CT1-4 520 kHz 1,650 kHz
CT1-2: FM TRACKING
T2: FM IF L4: FM FREQUENCY COVERAGE
AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L2 CT1-1 620 kHz 1,400 kHz
--4--
SECTION 4 DIAGRAMS
4-1. BLOCK DIAGRAM
SRF-H3
AM FREQ. COVERAGE B+(R16) CV1-4 L5 4 CT1-4 AM TRACKING B+(R16) CV1-1 ANT1 FM ANT L2 CT1-1 FERRITE-ROD ANTTENA FM TRACKING B+(R16) CV1 TUNE CV1-2 CT1-2 1 FM FREQ. COVERAGE B+(R16) CV1-3 CT1-3 3 L4 FM OSC FM OSC L3 FM RF OUT AM B+ BPF 16 FM RF IN FM MIX S1 SENS DX LOCAL S1-2 AM OSC AM OSC
FM/AM FRONT END IC1(1/3) AM AGC
S2 BAND FM AM VCC1 2 B+ AM B+
BUFFER Q1 13
AM IF AM RF IN AM MIX AM MIX OUT T1 5 CF2 FM MIX OUT 14 CF1 12 FM RF IN 7 AM IF IN AM DET
STEREO MPX IC2 AF OUT 8 FM DET 5 6 MPX 13 STEREO DECODE L OUT R OUT 15 16 R-CH
RV2 VOL 2
POWER AMP IC3
S1-1 DX/LOCAL
9
SP1 SPEAKER
9 MPX T2 B+ FM IF RV1 VCO S3 POWER OFF ON B+ VCO 38k 19k<90º 19k<0º
R-CH
SP2 SPEAKER
11
· Signal path FM: 16 AM:
Note on Printed Wiring Board: · X : parts extracted from the component side. · b : Pattern from the side which enables seeing. 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. f · : internal component. · A : B+ Line. · H : adjustment for repair. · Power voltage is dc 1.5 V and fed with regulated dc power supply from battery terminal. · Voltages are dc with respect to ground under no-signal conditions. · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Signal path. F: FM f: AM
· IC BLOCK DIAGRAMS IC1 TA7792F
POWER SWITCH 1
POWER SWITCH
MUTE CIRCUIT
10 MUTE SWITCH
IN 1 2
Amp1
9 OUT 1
PRE GND 3
8 POWER GND
IN 2 4
Amp2
7 OUT 2
REF 5
BIAS
6 VCC
IC3 LA4537M
PWR 1 R-IN 2 GND 3 L-IN 4
POWER SWITCH AMP
MUTE
10 MUTE 9 R-OUT
BIAS
8 GND 7 L-OUT
AMP REG 5 6 VCC
--5--
--6--
SRF-H3
4-2. SCHEMATIC DIAGRAM
16
--7--
--8--
SRF-H3
4-3. PRINTED WIRING BOARD
· Semiconductor
Location
Ref. No. D1 IC1 IC2 IC3 Q1 Location F-3 E-9 E-3 C-2 D-10
--9--
-- 10 --
SECTION 5 EXPLODED VIEWS
NOTE: · -XX, -X mean standardized parts, so they may have some differences from the original one. · Items marked "*" are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. · · The mechanical parts with no reference number in the exploded views are not supplied. Hardware (# mark) list and accessories and packing materials are given in the last of this parts list.
AUDIO
TUNER
· ·
SECTION 6 ELECTRICAL PARTS LIST
CAPACITORS: uF: µF RESISTORS All resistors are in ohms. METAL: metal-film resistor METAL OXIDE: Metal Oxide-film resistor F: nonflammable COILS uH: µH · SEMICONDUCTORS In each case, u: µ, for example: uA...: µA... , uPA... , µPA... , uPB... , µPB... , uPC... , µPC... , uPD..., µPD...
When indicating parts by reference number, please include the board name.
12 20 18 17 21 13
ANT 1
11 9
10
NOTE: · Due to standardization, replacements in the parts list may be different from the parts specified in the diagrams or the components used on the set. · -XX, -X mean standardized parts, so they may have some difference from the original one. · Items marked "*" are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items. Ref. No. * Part No. Description
·
8
Remarks
Ref. No. *
Part No.
Description
Remarks
A-3670-048-A AUDIO BOARD, COMPLETE ********************** 3-902-546-01 TERMINAL (PLUS), BATTERY < CAPACITOR >
A-3683-222-A TUNER BOARD, COMPLETE ********************** 3-831-441-99 CUSHION 3-902-555-01 SHEET (FERRITE-ROD ANTENNA) < FILTER >
19
15
16 23
22
C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37
1-104-396-11 1-162-637-11 1-163-081-00 1-162-637-11 1-163-275-11 1-163-022-00 1-163-022-00 1-162-638-11 1-162-638-11 1-163-117-00 1-163-117-00 1-124-229-00 1-163-077-00 1-124-635-00 1-163-077-00 1-163-077-00 1-124-635-00 1-124-635-00 1-163-031-11
ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT CERAMIC CHIP ELECT CERAMIC CHIP CERAMIC CHIP ELECT ELECT CERAMIC CHIP < DIODE >
10uF 0.47uF 0.22uF 0.47uF 0.001uF 0.012uF 0.012uF 1uF 1uF 100PF 100PF 33uF 0.1uF 220uF 0.1uF 0.1uF 220uF 220uF 0.01uF
20.00% 16V 16V 25V 16V 5.00% 50V 10% 10% 50V 50V 16V 16V 50V 50V 10V 25V 6.3V 25V
BPF1
1-236-839-11 FILTER, BAND PASS < CAPACITOR >
6 8
SP1 L2
24
C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18
1-163-021-91 1-126-514-11 1-126-117-11 1-126-117-11 1-163-077-00 1-163-129-00 1-162-638-11 1-163-222-11 1-162-638-11 1-163-100-00 1-163-077-00 1-163-021-91 1-163-101-11 1-163-093-00 1-126-154-11
CERAMIC CHIP ELECT ELECT ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT
0.01uF 22uF 330uF 330uF 0.1uF 330PF 1uF 5PF 1uF 20PF 0.1uF 0.01uF 22PF 10PF 47uF
10.00% 20.00% 20.00% 20.00% 10% 5%
50V 6.3V 2V 2V 25V
5% 5% 20% 10% 20.00% 10%
14 1 28 25 5 26
SP2
50V 16V 0.25PF 50V 16V 5% 50V 10% 10.00% 5.00% 5% 20% 25V 50V 50V 50V 6.3V
2 4
3
27
10% 25V 20.00% 6.3V 20.00% 6.3V 50V
D1
8-719-981-95 DIODE MTZJ-2.7B < IC >
1-163-033-91 CERAMIC CHIP 1-163-129-00 CERAMIC CHIP 1-163-014-00 CERAMIC CHIP < FILTER >
0.022uF 50V 330PF 5% 50V 0.0027uF 10.00% 50V
IC2 IC3 Ref. No. * 1 2 3 4 5 6 * 8 9 10 11 12 13 14 15 * 16 17 Part No. A-3683-222-A X-3379-444-1 3-902-544-01 3-902-551-01 3-309-597-31 3-902-555-01 3-902-552-01 3-902-546-01 X-3379-445-1 3-902-542-01 3-902-547-01 3-318-203-51 3-363-940-01 3-902-539-01 A-3670-048-A Description TUNER BOARD, COMPLETE CABINET FRONT (R) ASSY GEAR(TUNING) SCALE(FM/AM), DIAL SCREW(1.4), TAPPING,PRECISION SHEET(FERRITE-ROD ANTENNA) PLATE, CLICK TERMINAL (PLUS), BATTERY CABINET FRONT (L) ASSY KNOB SPRING, BATTERY COIL SCREW (B1.7X12), TAPPING PAD, EAR LID, BATTERY CASE AUDIO BOARD, COMPLETE Remarks Ref. No. 18 19 20 21 22 23 24 25 26 27 28 L2 SP1 SP2 ANT1 Part No. 1-575-829-11 3-902-542-11 3-902-556-11 3-902-537-11 3-902-541-01 3-902-560-01 3-902-538-01 3-902-538-01 3-902-543-01 3-902-540-01 3-902-558-21 1-402-505-11 1-505-114-11 1-505-114-11 X-3379-374-1 Description CORD, CONNECTION KNOB BELT, MAIN BELT (SUB) KNOB (VOLUME) CABINET (REAR) (L) HOLDER HOLDER KNOB (SENS) KNOB (TUNING) CABINET (REAR) (R) ANTENNA, FERRITE-ROD (MW) DRIVER (HEADPHONE) DRIVER (HEADPHONE) ANTENNA ASSY Remarks
8-759-945-89 IC BA1362FST1 8-759-822-48 IC LA4537M < RESISTOR >
CF1 CF2
1-567-097-61 FILTER, CERAMIC 1-578-677-11 FILTER, CRYSTAL < VARIABLE CAPACITOR >
R22 R23 R24 R25 R26 R27
1-216-049-11 1-216-069-00 1-216-296-91 1-216-296-91 1-216-084-00
RES-CHIP METAL CHIP SHORT SHORT METAL CHIP
1K 6.8K 0 0 30K 30K
5% 5%
1/10W 1/10W
CV1
1-151-620-11 CAP, VARIABLE (TUNE) < TRIMMER >
5% 5%
1/10W 1/10W
CT1
1-151-620-11 CAP, VARIABLE < IC >
1-216-084-00 METAL CHIP
< VARIABLE RESISTOR > RV1 RV2 1-228-994-00 RES, ADJ, METAL10K 1-241-130-00 RES, VAR, CARBON 20K/20K (VOL) < SWITCH > S3 1-553-510-11 SWITCH, SLIDE (POWER) ************************************************************
IC1
8-759-230-65 IC TA7792F < COIL >
3-902-549-01 CAP, ANTENNA
L1 L2 L3 L4 L5
1-414-142-61 1-402-505-11 1-428-123-11 1-428-122-11 1-406-390-21
INDUCTOR 1uH ANTENNA, FERRITE-ROD (MW) COIL, AIR-CORE COIL, AIR-CORE COIL (OSC)
-- 11 --
-- 12 --
TUNER
Ref. No. Part No. Description < TRANSISTOR > Q1 8-729-109-44 TRANSISTOR < RESISTOR > R1 R3 R4 R5 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R21 1-216-295-00 1-216-045-00 1-216-295-00 1-216-021-00 1-216-035-00 1-216-017-91 1-216-043-91 1-216-296-91 1-216-295-00 1-216-009-00 1-216-073-00 1-216-295-00 1-216-009-00 1-216-061-00 1-216-049-11 SHORT METAL CHIP SHORT METAL CHIP METAL CHIP RES-CHIP RES-CHIP SHORT SHORT RES-CHIP METAL CHIP SHORT RES-CHIP METAL CHIP RES-CHIP 0 680 0 68 270 47 560 0 0 22 10K 22 3.3K 1K 100 1K 2SK94 Remarks
5% 5% 5% 5% 5%
1/10W 1/10W 1/10W 1/10W 1/10W
5% 5% 0 5% 5% 5% 5% 5%
1/10W 1/10W 1/10W 1/10W 1/10W 1/10W 1/10W
1-216-025-11 RES-CHIP 1-216-049-11 RES-CHIP < SWITCH >
S1 S2
1-554-667-00 SWITCH, SLIDE (SENS) 1-553-510-11 SWITCH, SLIDE (BAND) < TRANSFORMER >
T1 1-404-920-21 TRANSFORMER, IF T2 1-404-921-21 TRANSFORMER, DISCRIMINATOR ************************************************************ MISCELLANEOUS ************** SP1 1-505-114-11 DRIVER (HEADPHONE) SP2 1-505-114-11 DRIVER (HEADPHONE) ANT1 X-3379-374-1 ANTENNA ASSY ************************************************************ ACCESSORIES & PACKING MATERIALS ******************************** 3-049-014-11 MANUAL, INSTRUCTION (ENGLISH)
-- 13 --
SRF-H3
Sony Corporation
9-927-940-31
Audio Entertainment Group
-- 14 --
2000G16024-1 Printed in Japan ©2000.7 Published by PE General Engineering Dept.