TABLE OF CONTENTS
1. SERVICE NOTESááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááSAFETY CHECK-OUT3
2. GENERALááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááAfter correcting the original service pr4oblem, perform the following
safety checks before releasing the set to the customer:
3. DISASSEMBLYCheck the antenna terminals, metal trim, Ometallized� knobs, screws,
3-1. Front Cabinet, Control (1) Board, Control (2) Board,and all other exposed metal parts for AC leakage. Check leakage as
Headphone Board ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááádescribed below.9
3-2. Upper Cabinetááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 9
3-3. Optical Pick-up áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááLEAKAGE10
3-4. Mechanism Deck, Rec sw Board, Main Board,
Power Board, Primary Board, Batt Board ááááááááááááááááááááááááThe AC leakage from any exposed metal part to ear10th ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
4. ADJUSTMENTS
Leakage current can be measured by any one of three methods.
4-1. Mechanical Adjustment áááááááááááááááááááááááááááááááááááááááááááááááááááá 11
4-2. Electrical Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááááááá 11
1. A commercial leakage tester, such as the Simpson 229 or RCA
4-3. Tuner Sectionáááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 12
WT-540A. Follow the manufacturersO instructions to use these
4-4. Reference áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 15
instruments.
5. DIAGRAMS
2. A battery-operated AC milliammeter. The Data Precision 245
5-1. Circuit Board Location ááááááááááááááááááááááááááááááááááááááááááááááááááááá 17
digital multimeter is suitable for this job.
5-2. IC Pin Function áááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 18
5-3. Block Diagram ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 20
3. Measuring the voltage drop across a resistor by means of a
5-4. Printed Wiring Board áááááááááááááááááááááááááááááááááááááááááááááááááááááááá 23
VOM or battery-operated AC voltmeter. The Olimit� indication
5-5. Schematic Diagram � Tuner/System Section � áááááááááááááááá 27
is 0.75 V, so analog meters must have an accurate low-voltage
5-6. Schematic Diagram � Power Section � áááááááááááááááááááááááááááá 31
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
5-7. Schematic Diagram � CD Section � ááááááááááááááááááááááááááááááááá 35
a passive VOM that is suitable. Nearly all battery operated
5-8. IC Block Diagrams ááááááááááááááááááááááááááááááááááááááááááááááááááááááááááá 38
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
6. EXPLODED VIEWS
6-1. Front Cabinet Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááá 39
6-2. Upper Cabinet Section áááááááááááááááááááááááááááááááááááááááááááááááááááááá 40
6-3. Rear Cabinet Section ááááááááááááááááááááááááááááááááááááááááááááááááááááááááTo Exposed Metal 41
Parts on Set
6-4. Mechanism Deck Setion (1) (MF-V10-117) áááááááááááááááááááá42
6-5. Mechanism Deck Setion (2) (MF-V10-117) áááááááááááááááááááá 43
6-6. Optical Pick-up Section (KSM-213CDM/C2NP) áááááááááááá 44
7. ELECTRICAL PARTS LISTááááááááááááááááááááááááááááááááááááááá45
AC
Voltmeter
0.15 ?F1.5 k1
(0.75 V)
Earth Ground
Battery lifeFor CD radio cassette-corder:
Fig. A. Using an AC voltmeter to check AC leakage.
FM recording
Sony R20P : approx. 13.5 h
Sony alkaline LR20 : approx. 19 hSAFETY-RELATED COMPONENT WARNING!!
Tape playback
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
Sony R20P : approx. 7.5 hMARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
Sony alkaline LR20 : approx. 15 hLIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
CD playback
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
Sony R20P : approx. 2.5 hPUBLISHED BY SONY.
Sony alkaline LR20 : approx. 6 h
DimensionsApprox. 425 ´ 160 ´ 246 mm (w/h/d)
(16 3/4 ´ 6 3/8 ´ 9 3/4 inches) (incl. projectingATTENTION AU COMPOSANT AYANT RAPPORT
� LA S?CURIT?!
parts)
LES COMPOSANTS IDENTIF?S PAR UNE MARQUE ! SUR LES
MassApprox. 4.2 kg (9 lb. 4 oz) (incl. batteries)
DIAGRAMMES SCH?MATIQUES ET LA LISTE DES PIéCES SONT
Supplied accessoriesAC power cord (1)
Remote controller (1)CRITIQUES POUR LA S?CURIT? DE FONCTIONNEMENT. NE
Design and specifications are subject to change without noticeREMPLACER CES COMPOSANTS Q.UE PAR DES PIéSES SONY
DONT LES NUM?ROS SONT DONN?S DANS CE MANUEL OU
Optional accessoriesDANS LES SUPP?MENTS PUBLI?S PAR SONY.
Sony MDR headphones series
N 2 N |
ACEC
