SONY SONY SA-WM250 ACTIVE SUBWOOFER. free download

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SA-WM250 SERVICE MANUAL Ver 1.0 2004.03 US Model Canadian Model AEP Model UK Model E Model SPECIFICATIONS AUDIO POWER SPECIFICATIONS POWER OUTPUT AND TOTAL HARMONIC DISTORTION: With 6 ohm loads, from 28 ­ 200 Hz; rated 100 watts, minimum RMS power, with no more than 0.8 % total harmonic distortion from 250 milliwatts to rated output. System Type Active Subwoofer (magnetically shielded design) Speaker unit Woofer: 20 cm dia. (8 in.), cone type RMS output 100 W (6 Ohms, 40 Hz, 10% THD) Frequency range 28 Hz ­ 200 Hz High frequency cut-off frequency 50 Hz ­ 200 Hz Phase selector NORMAL, REVERSE Inputs Input jacks Output jacks General Power requirements INPUT: input pin jack SPEAKER IN: input terminals SPEAKER OUT: output terminals Power consumption Dimensions Mass Supplied accessories Taiwan models: 110 V AC, 50 Hz USA and Canada models: 120 V AC, 60 Hz Other models: 230 V AC, 50/60 Hz 100 W Approx. 290 Ч 355 Ч 387 mm (11 3/8 Ч 14 Ч 15 1/4 in.) (w/h/d) 11.5 kg (25 lb 6 oz) Foot pads (4) Audio connecting cord (1 phono ­ 1 phono), 2 m (6 ft 6 1/2 in.) (1) Speaker cords, 2.5 m (8 ft 2 1/2 in.) (2) Design and specifications are subject to change without notice. ACTIVE SUBWOOFER 9-877-696-01 2004C04-1 © 2004.03 Sony Corporation Home Audio Company Published by Sony Engineering Corporation 1 SA-WM250 SAFETY CHECK-OUT After correcting the original service problem, perform the following safety check 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 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 lowvoltage 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 2 V AC range are suitable. (See Fig. A) To Exposed Metal Parts on Set TABLE OF CONTENTS 1. GENERAL Location of Controls ... 3 2. DIAGRAMS 2-1. Note for Printed Wiring Boards and Schematic Diagrams ... 3 2-2. Circuit Boards Location ... 3 2-3. Printed Wiring Boards ­ Main Section ­ ... 4 2-4. Printed Wiring Board ­ Input Control Section ­ ...