Sony SA-IF70 User manual

— 1 —
SPECIFICATIONS
TRANSMITTER EMT-70
REAR SPEAKER SA-IF70S
SA-IF70
US Model
Canadian Model
AEP Model
E Model
SERVICE MANUAL
MICROFILM
WIRELESS SPEAKER SYSTEM
• TRANSMITTER • REAR SPEAKER
• This set consist of the following units.

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ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LESCOMPOSANTSIDENTIFIÉSPAR UNEMARQUE !SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINE
WITH MARK !ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Checkthe antennaterminals, metal trim,“metallized” knobs,screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
returnto chassis, mustnotexceed0.5mA (500 microampers).Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of aVOM
or battery-operatedAC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
AC
voltmeter
(0.75V)
1.5k
Ω
0.15 µ F
Earth Ground
To Exposed Metal
Parts on Set
TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 3
2. ELECTRICAL ADJUSTMENTS ................................. 3
3. DIAGRAMS
3-1. Printed Wiring Board — Transmitter Section —.................. 5
3-2. Schematic Diagram — Transmitter Section — .................... 7
3-3. Printed Wiring Board — Receiver Section — ...................... 9
3-4. Schematic Diagram — Receiver Section — ....................... 11
3-5. IC Block Diagrams.............................................................. 13
4. EXPLODED VIEWS
4-1. Speaker Section................................................................... 14
4-2. Transmitter Section (EMT-70) ............................................ 15
5. ELECTRICAL PARTS LIST ........................................ 16

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4-2. TRANSMITTER SECTION (EMT-70)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
51 4-991-626-01 SPRING, CLICK
52 4-991-621-01 HOLDER, STAND
53 4-991-624-01 CASE (BOTTOM)
54 4-991-627-01 COVER (FRONT)
55 4-991-623-01 CASE (TOP)
*56 A-4403-194-A TRANSMITTER BOARD, COMPLETE
*57 1-666-726-11 LED BOARD
58 4-991-622-01 STAND
59 1-782-270-11 CORD, CONNECTION
not supplied
#3
#3
#3
#3
51 52
53
54
55
59
56
57
58

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SECTION 5
ELECTRICAL PARTS LIST
• SEMICONDUCTORS
In each case, u: µ , for example:
uA...: µ A..., uPA...: µ PA..., uPB...: µ PB...,
uPC...: µ PC..., uPD...: µ PD...
• CAPACITORS
uF : µ F
• COILS
uH : µ H
• Abbreviation
CND : Canadian model
• 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.
• RESISTORS
All resistors are in ohms
METAL: Metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F : nonflammable
Note:
Les composants identifiés par une
marque !sont critiques pour la
sécurité.
Ne les remplacer que par une
piéce portant le numéro spécifié.
The components identified by
mark !or dotted line with mark
!are critical for safety.
Replace only with part number
specified.
When indicating parts by reference
number, please include the board
name.
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
*A-4398-846-A AMPLIFIER BOARD, COMPLETE
**************************
< CAPACITOR >
C301 1-162-294-31 CERAMIC 0.001uF 10% 50V
C302 1-104-664-11 ELECT 47uF 20% 25V
C303 1-128-560-11 ELECT 22uF 20% 100V
C304 1-126-965-11 ELECT 22uF 20% 50V
C305 1-126-965-11 ELECT 22uF 20% 50V
C306 1-136-165-00 FILM 0.1uF 5% 50V
C307 1-126-933-11 ELECT 100uF 20% 16V
C308 1-126-960-11 ELECT 1uF 20% 50V
C309 1-104-664-11 ELECT 47uF 20% 25V
C310 1-126-955-11 ELECT 4700uF 20% 35V
C311 1-126-955-11 ELECT 4700uF 20% 35V
C312 1-126-942-61 ELECT 1000uF 20% 25V
C313 1-126-935-11 ELECT 470uF 20% 16V
C314 1-104-664-11 ELECT 47uF 20% 25V
C315 1-136-165-00 FILM 0.1uF 5% 50V
C316 1-136-165-00 FILM 0.1uF 5% 50V
C317 1-136-165-00 FILM 0.1uF 5% 50V
C318 1-137-372-11 FILM 0.022uF 5% 50V
C320 1-162-282-31 CERAMIC 100PF 10% 50V
< CONNECTOR >
CN301 1-691-768-11 PLUG (MICRO CONNECTOR) 6P
CN302 1-580-230-31 PIN, CONNECTOR (PC BOARD), 2P
CN303 1-564-505-11 PLUG, CONNECTOR 2P
< DIODE >
D301 8-719-028-23 DIODE D3SBA20-4101
D302 8-719-987-63 DIODE 1N4148M
D303 8-719-987-63 DIODE 1N4148M
D304 8-719-987-63 DIODE 1N4148M
D305 8-719-200-82 DIODE 11ES2
D306 8-719-200-82 DIODE 11ES2
D307 8-719-200-82 DIODE 11ES2
D308 8-719-200-82 DIODE 11ES2
D309 8-719-987-63 DIODE 1N4148M
D310 8-719-987-63 DIODE 1N4148M
< FUSE >
!F301 1-532-389-51 FUSE TIME-LAG (T0.5AL/250V) (AEP,E)
!F301 1-576-100-11 FUSE (1A/250V) (US,CND)
< FUSE HOLDER >
FH301 1-533-293-11 FUSE HOLDER
FH302 1-533-293-11 FUSE HOLDER
< IC >
IC301 8-759-467-10 IC LM4700TF
IC302 8-759-111-68 IC uPC1237HA
IC303 8-759-604-40 IC M5F78M15
< RESISTOR >
R301 1-249-429-11 CARBON 10K 5% 1/4W
R302 1-247-863-91 CARBON 22K 5% 1/4W
R303 1-249-417-11 CARBON 1K 5% 1/4W F
R304 1-247-863-91 CARBON 22K 5% 1/4W
R305 1-249-393-11 CARBON 10 5% 1/4W F
R306 1-249-441-11 CARBON 100K 5% 1/4W
R307 1-247-807-31 CARBON 100 5% 1/4W
R308 1-249-429-11 CARBON 10K 5% 1/4W
R309 1-249-435-11 CARBON 33K 5% 1/4W
R310 1-249-429-11 CARBON 10K 5% 1/4W
R311 1-249-441-11 CARBON 100K 5% 1/4W
!R312 1-215-865-11 METAL OXIDE 220 5% 1W F
R313 1-249-381-11 CARBON 1 5% 1/4W F
R314 1-247-863-91 CARBON 22K 5% 1/4W
R315 1-247-863-91 CARBON 22K 5% 1/4W
< RELAY >
RY301 1-755-142-11 RELAY
< TRANSFORMER >
!T301 1-431-342-11 TRANSFORMER, POWER (AEP,E)
!T301 1-431-343-11 TRANSFORMER, POWER (US,CND)
***************************************************************
*1-666-726-11 LED BOARD
*********
< DIODE >
D401 8-719-992-14 DIODE LIR5BEA
D402 8-719-992-14 DIODE LIR5BEA
D403 8-719-992-14 DIODE LIR5BEA
D404 8-719-992-14 DIODE LIR5BEA
D405 8-719-992-14 DIODE LIR5BEA
AMPLIFIER LED