Stimmen - 3, Durchschnittliche Bewertung: 3
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Anleitung Zusammenfassung
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 return to chassis, must not exceed 0.5 mA (500 microampers). 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) Fig. A. Using an AC voltmeter to check AC leakage. 0.15.F To Exposed Metal Parts on Set 1.5kW AC voltmeter (0.75V) Earth Ground TABLE OF CONTENTS 1. GENERAL ........................................................................... 3 2. ELECTRICAL ADJUSTMENT .................................... 5 3. DIAGRAMS 3-1. Circuit Boards Location ........................................................ 5 3-2. Schematic Diagram – Main Section (1/3) – .......................... 6 3-3. Schematic Diagram – Main Section (2/3) – .......................... 7 3-4. Schematic Diagram – Main Section (3/3) – .......................... 8 3-5. Printed Wiring Board – Main Section – ................................ 9 3-6. Schematic Diagram – Power Section – ............................... 10 3-7. Printed Wiring Board – Power Section – ............................ 11 4. EXPLODED VIEWS 4-1. Top Plate and Back Panel Section ....................................... 12 4-2. Front Panel Section ............................................................. 12 4-3. Bottom Plate Section .......................................................... 13 5. ELECTRICAL PARTS LIST ................................... 14 MODEL IDENTIFICATION — BACK PANEL — Parts No. 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. ATTENTION AU COMPOSANT AYANT RAPPORT A LA SECURITE!! LES COMPOSANTS IDENTIFIES PAR UNE MARQUE !SUR LES DIAGRAMMES SCHEMATIQUES ET LA LISTE DES PIECES SONT CRITIQUES POUR LA SECURITE DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIECES SONY DONT LES NUMEROS SONT DONNES DANS CE MANUEL OU DANS LES SUPPLEMENTS PUBLIES PAR SONY. PARTS No. MODEL 4-214-526-1. US , CND 4-214-526-2. AEP, UK, E, AUS • Abbreviation CND : Canadian model AUS : Australian model SECTION 1 GENERAL This section is extracted from instruction manual. SECTION 2 ELECTRICAL ADJUSTMENTS IDLING ADJUSTMENT AND OFFSET VOLTAGE BALANCE OUTPUT LEVEL ADJUSTMENT CHECK • Perform this adjustment when replacing CP102. • Perform this adjustment after replacing CP103 and CP104. • Perform this adjustment after the idling adjustment • Perform this adjustment more than 10 minutes after supplying the power. Connection: Connection: AF OSC Digital voltmeter MAIN board BALANCED-OUT 23 pin LINE1 input Set attenuator Oscilloscope TP501 (L-CH), TP502 (R-CH) TP503 (L-CH), TP504 (R-CH) Procedure: Procedure: 1. Connect as shown above. 1. Connect the digital voltmeter as shown above. 2. Rotate the to LINE 1 . INPUT SELECTOR knob, and set the input source so that the digital voltmeter reads 50 mV ±5 mV. (Idling adjustment) 2. Adjust RV501 (L-CH) and RV502 (R-CH) of the MAIN board 3. Set the input level so that the oscilloscope waveform level becomes approx 3 V. Measuring Adjusting Adjusting Point Point Value L-CH TP501 to TP503 RV501 50 mV ± 5 mV R-CH TP502 to TP504 RV502 50 mV ± 5 mV 4. Adjust RV401 (L-CH) and RV402 (R-CH) so that the two waveform levels on the oscilloscope become equal and their phases are reversed. 3. Measure the voltage of both terminals of R221 (L-CH) and R222 (R-CH) of the MAIN board, and check that the voltage is within 2 mV. (Offset voltage check) Adjusting Point Adjusting Value L-CH Pin 2 (CH1) and Pin 3 (CH2) of CN203 RV401 R-CH Pin 2 (CH1) and Pin 3 (CH2) of CN203 RV401 Measuring Point Specified Value L-CH Both terminals of R221 Within 2 mV R-CH Both terminals of R222 Within 2 mV Adjusting Value: Waveform of Pin 2 (CH1) Waveform of Pin 3 (CH2) Phases of waveforms of Pins 2 and 3 should be reversed Adjustment Location: [MAIN board] (Component Side) OFFSET VOLTAGE R222 R221 RV401 BALANCE OUT LEVEL L CH RV402 BALANCE OUT LEVEL R CH RV501 IDLE L CH TP503 RV502 IDLE R CH TP501 TP504 TP502 5 SECTION 3 DIAGRAMS 3-1. CIRCUIT BOARDS LOCATION MAIN board SW L board AC J board LED A board LED B board SW P board PS board VOL board THIS NOTE ...