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Extracted text from sony hcd ep 303 service manual (Ocr-read)
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HCD-EP303
TABLE OF CONTENTS
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna FM lead antenna
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Pan-American model: 530 - 1 710 kHz
(with the interval set at
10 kHz)
531 - 1 602 kHz
(with the interval set at
9 kHz)
European model: 531 -1 602 kHz
(with the interval set at
9 kHz)
Other models: 531 - 1 602 kHz
(with the interval set at
9 kHz)
530 - 1 710 kHz
(with the interval set at
10 kHz)
Antenna Built-in ferrite bar antenna
Intermediate frequency 450 kHz
General
Power requirements
North American model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Australian model: 230 V AC, 50/60 Hz
Mexican model: 120 V AC, 60 Hz
Argentine model: 220 - 230 V AC, 50/60 Hz
Other models: 230 V AC, 50/60 Hz
Power consumption
U.S.A. model: 25 W
Canadian model: 25 W
European model: 30 W
0.5 W (in the standby
mode)
Other models: 30 W
Dimensions (w/h/d):
Approx. 145 × 240 × 252 mm
Mass: Approx. 2.9 kg
Design and specifications are subject to change
without notice.
1. SERVICING NOTES ······················································ 4
2. GENERAL ·········································································· 5
3. DISASSEMBLY ································································ 7
3-1. Front Panel Section ······················································· 7
3-2. MAIN Board ································································· 8
3-3. Tape Mechanism Deck (TCM125-2) ··························· 8
3-4. POWER Board, Power Transformer ···························· 9
3-5. DISPLAY Board, HEADPHONE Board ····················· 9
3-6. CD Cabinet Section ··················································· 10
3-7. CD Mechanism Deck (CS-21SC-1280) ····················· 10
3-8. Cassette Lid ······························································· 11
4. MECHANICAL ADJUSTMENTS ····························· 12
5. ELECTRICAL ADJUSTMENTS ······························· 12
6. DIAGRAMS ······································································ 16
6-1. Circuit Boards Location ·············································· 16
6-2. Block Diagrams ·························································· 18
6-3. Printed Wiring Board MAIN Section ························ 21
6-4. Schematic Diagram MIAN Section (1/2) ·················· 22
6-5. Schematic Diagram MIAN Section (2/2) ·················· 23
6-6. Printed Wiring Board CASSETTE Section ··············· 24
6-7. Schematic Diagram CASSETTE Section ·················· 24
6-8. Printed Wiring Board DISPLAY Section ·················· 25
6-9. Schematic Diagram DISPLAY Section ····················· 26
6-10. Printed Wiring Board POWER Section ····················· 27
6-11. Schematic Diagram POWER Section ························ 28
6-12. IC Pin Function Description ······································· 31
7. EXPLODED VIEWS ······················································ 32
7-1. Cabinet Section ··························································· 32
7-2. Front Panel Section -1 ················································ 33
7-3. Front Panel Section -2 ················································ 34
7-4. CD Cabinet Section ···················································· 35
8. ELECTRICAL PARTS LIST ······································· 36
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To Exposed Metal
Parts on Set
0.15 µF
1.5 k-„¦AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
This appliance is classified as a CLASS 1 LASER product. The
CLASS 1 LASER PRODUCT MARKING is located on the rear
exterior.
The following caution label is located inside the unit.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
HCD-EP303
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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.ATTENTION AU COMPOSANT AYANT RAPPORT
Ã- LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR 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.
Flexible Circuit Board Repairing
-Keep the temperature of soldering iron around 270ËšC
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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, metallized knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth 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).
Leakage 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 a
VOM or battery-operated AC 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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)