Sony hcd ep 303 service manual
This is the 44 pages manual for sony hcd ep 303 service manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from sony hcd ep 303 service manual (Ocr-read)
Page 1
2 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
Page 2
3 To Exposed Metal Parts on Set 0.15 µF 1.5 kΩAC 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 À 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 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. 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)