Yamaha-YSTRSW-300-Service-Manual电路原理图.pdf

I CONTENTS TO SERVICE PERSONNEL . 2 REAR PANELS . 34 SPECIFICATIONS. 45 INTERNAL VIEW . 5 DISASSEMBLY PROCEDURES . 67 CHECKS AND ADJUSTMENTS. 89 BLOCK DIAGRAM. 10 PRINTED CIRCUIT BOARDS. 1112 SCHEMATIC DIAGRAM . 13 REPLACEMENT PARTS LIST . 1519 IMPORTANT NOTICE This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are already known and understood by the users, and have therefore not been restated. WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive components, and failure of the product to perform as specified. For these reasons, we advise all YAMAHA product owners that any service required should be performed by an authorized YAMAHA Retailer or the appointed service representative. IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certification or recognition of any applicable technical capabilities, or establish a principle-agent relationship of any form. The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research, engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products. Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division. WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss). IMPORTANT:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to the unit. P.O.Box 1, Hamamatsu, Japan YST-RSW300 2007 All rights reserved. This manual is copyrighted by YAMAHA and may not be copied or redistributed either in print or electronically without permission. Status indicator 101052 SERVICE MANUAL SUBWOOFER SYSTEM YST-RSW300 07.04 YST-RSW300 2 YST-RSW300 WALL OUTLET EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE 1. Critical Components Information Components having special characteristics are marked s and must be replaced with parts having specifications equal to those originally installed. 2. Leakage Current Measurement (For 120V Models Only) When service has been completed, it is imperative to verify that all exposed conductive surfaces are properly insulated from supply circuits. GMeter impedance should be equivalent to 1500 ohms shunted by 0.15F. For U model “CAUTION” “F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 6A, 125V FUSE.” For C model CAUTION F1:REPLACE WITH SAME TYPE 6A, 125V FUSE. ATTENTION F1:UTILISER UN FUSIBLE DE RECHANGE DE MME TYPE DE 6A, 125V. GLeakage current must not exceed 0.5mA. GBe sure to test for leakage with the AC plug in both polarities. I TO SERVICE PERSONNEL WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REA- SON WHATSOEVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food. All of the P.C.B.s installed in this unit and solder joints are soldered using the lead free solder. Among some types of lead free solder currently available, it is recommended to use one of the following types for the repair work. Sn + Ag + Cu (tin + silver + copper) Sn + Cu (tin + copper) Sn + Zn + Bi (tin + zinc + bismuth) Caution: As the melting point temperature of the lead free solder is about 30C to 40C (50F to 70F) higher than that of the lead solder, be sure to use a soldering iron suitable to each solder. About lead free solder YST-RSW300 3 YST-RSW300 I REAR PANELS U, C modelsR model K modelA model YST-RSW300 4 YST-RSW300 B, G modelsL model I SPECIFICATIONS Type. Advanced Yamaha Active Servo Technology II Output Power (100 Hz, 5 ohms, 10% T.H.D.) . 250 W Dynamic Power (5 ohms). 270 W Input Sensitivity (50 Hz, 250 W/5 ohms, L+R) INPUT1 (SP) . 1.0 V INPUT2 (PJ). 50 mV Input Impedance INPUT1 (SP) . 2.2 k-ohms INPUT2 (PJ). 12 k-ohms Frequency Response . 20 Hz to 160 Hz Driver.25 cm (10) cone woofer, Magnetic shielding type Input Section INPUT1 .Speaker terminal INPUT2 . RCA pin jack Operation Section Front panel. STANDBY/ON key VOLUME control HIGH CUT control Status indicator Rear panel . POWER ON/OFF key AUTO STANDBY (HIGH / LOW / OFF) key PHASE (NORM / REV) key VOLTAGE SELECTOR key (R, L models) Power Supply U, C models . AC 120 V, 60 Hz R, L models.AC 110/120/220/230-240 V, 50/60 Hz K model . AC 220 V, 60 Hz A model . AC 240 V, 50 Hz B, G models . AC 230 V, 50 Hz Power Consumption. 80 W Standby Power Consumption . 0.5 W (Reference data) Dimensions (W x H x D) . 372 x 400 x 428.2 mm (14-5/8 x 15-3/4 x 16-7/8) Weight . 20 kg (44 lbs. 1oz.) Finish Cherry color . U, C, R, K, A, B, G, L models Black color . U, C, R, K, A, B, G, L models Accessories. Nonskid pad x 4 * Specifications are subject to change without notice due to prod- uct improvements. U . U.S.A. modelC . Canadian model R . General modelK . Korean model A . Australian modelB . British model G . European modelL . Singapore model YST-RSW300 5 YST-RSW300 DIMENSIONS 400 (15-314) 372 (14-5/8) 428.2 (16-7/8) 372 (14-5/8) 26.6 (1-1/16) 29.6 (1-3/16) Unit: mm (inch) I INTERNAL VIEW 123 78A09 6541 2 3 4 5 6 7 8 9 0 A MAIN (8) P.C.B. MAIN (4) P.C.B. MAIN (2) P.C.B. MAIN (1) P.C.B. MAIN (10) P.C.B. MAIN (3) P.C.B. MAIN (6) P.C.B. POWER TRANSFORMER MAIN (11) P.C.B. (U, C, K, A, B, G models) MAIN (7) P.C.B. (R, L models) MAIN (9) P.C.B. (R, L models) MAIN (5) P.C.B. Advanced YST II Advanced Yamaha Active Servo Technology II is a unique system to let the speaker unit have a perfectly linear motion by the speaker and amplifier combination. YST-RSW300 6 YST-RSW300 I DISASSEMBLY PROCEDURES Fig. 1 1. Removal of Front Grille Assy *The front grille assy is fixed to the cabinet with dow- els at 5 locations. As a flatblade screwdriver is used for removal, use special care not to cause damage to the cabinet assy. a. Using the flatblade screwdriver inserted in the gap be- tween the front grille assy and the cabinet assy (bot- tom side first), push up the front grille assy. (Fig. 1) b. Remove the front grille assy by lifting a metalblade up. (Fig. 1) *When installing the front grille assy, apply quick-dry- ing bond or the like to dowels and then fit them into dowel holes for secure installation. (The front grille assy will come off easily if its dowels are fitted into dowel holes without applying quickdrying bond or the like.) 2. Removal of Driver a. Remove 4 screws (1)and then remove the driver. (Fig. 1) b. Disconnect the connector connected to the terminal of the driver. (Fig. 1) Rubber sheet and cloth Cabinet assy Bottom side Bottom side TerminalTerminalTerminal 1 Driver Front grille assy Connector Dowels Dowels Metalblade Flatblade screwdriver (Remove parts in the order as numbered.) Disconnect the power cable from the AC outlet. Spread a rubber sheet and cloth, then place the main unit upside down on it. YST-RSW300 7 4Knob Front panel Front panel CB9 Switch cover assy Knob hole L-shaped metal part or the like 5 Cable Bush When Checking the P.C.B.: Connect all the connectors removed during disassem- bly back to the original positions. Spread cloth first and place the rear panel assy and switch cover assy on it. (Fig. 4) Fig. 4 4. Removal of Front Panel Assy *The front panel once removed cannot be reused. Be sure to use a new front panel for replacement. Before installing the new front panel, be sure to remove the double sided adhesive tape remaining from the old front panel completely. a. Remove 2 knobs (4). (Fig. 3) b. Insert L-shaped metal parts or the like into the volume knob hole and high-cut knob hole in the front panel and pull the panel gradually away from the cabinet to re- move it. Fig. 3 c. Remove 2 screws (5). (Fig. 3) d. Pull out the switch cover assy. (Fig. 3) e. Remove bush. (Fig. 3) *The bush once removed cannot be reused. Be sure to use a new bush for replacement. f. Remove the switch cover assy together with the cable/ CB9. (Fig. 3) 3. Removal of Rear Panel Assy a. Remove 8 screws (2). (Fig. 2) *Screws (2) are identified with arrow marks (). b. Pull out the rear panel assy together with the cover. (Fig. 2) c. Remove bush. (Fig. 2) *The bush once removed cannot be reused. Be sure to use a new bush for replacement. Fig. 2 d. Remove 2 screws (3). (Fig. 2) *Screws (3) are identified with arrow marks (). e. Remove the cover. (Fig. 2) f. Disconnect the connectors (CB9 and CB10). (Fig. 2) Rear panel assy 2 3 3 2 to CB4 Bush Cover to CB10 to CB9 Bottom side Rubber sheet and cloth Rubber sheet and cloth Rear panel assy Switch cover assy YST-RSW300 8 I CHECKS AND ADJUSTMENTS Devices required Signal generator 8-ohm or 6-ohm load resistor Oscilloscope (dual trace type) Connection 1) Connect the output signal from the signal genera- tor to the input terminal of the main unit. 2) Disconnect the connector terminal connected to the speaker unit and reconnect it to the load resis- tor. 3) Connect the HOT side of the oscilloscope CH1 probe to the point A or B indicated in the figure and the GND side to the GND of the main unit. (Fig. 1) 4) Connect the oscilloscope CH2 input to the red side of the connector cable, which is connected with the load resistor. At this time, the GND terminal of CH2 must be left unconnected. V: 20 V/divH: 2 msec/div DC range1 : 1 probe G Confirmation of power amplifier operation For the power amplifier which has been repaired, it is absolutely necessary to confirm that a correct waveform is obtained at points indicated by A and B in the schematic diagram according to the following procedure. Setting 1) Set the signal generator to the sine wave, 100 Hz and minimum output level settings. 2) Set the volume of the main unit to the minimum po- sition. 3) Turn on the power to the main unit. 4) Adjust the output level of the signal generator and the volume of the main unit so that the output level observed at oscilloscope CH2 is 26 Vp-p to 28 Vp-p. Waveform observation With the settings made as described above, observe the waveform obtained at CH1 for judgment. Point A (Cathode of D29/D30) V: 20 V/divH: 2 msec/div DC range1 : 1 probe Point B (Anode of D27/D28) G Idling adjustment To stabilize operation of the amplifier, turn ON the power with no input signal and wait for 2 to 3 minutes in non loaded condition before the adjustment. Confirm that the voltage across the terminals TP1 and TP2 is 20 mV to 350 mV. If it exceeds 350 mV, open (cut off) R136. Attention: If the idling current exceeds 350 mV after a power amplifier repair, check for a defective component before cutting the resistor. DRIVER WOOFER PS AMP PS AMP POWER DRIVE POWER DRIVE PS AMP PS AMP A D29 D30 D29 D30 D28 D27 D28 D27 R136 TP2 DC 20 mV to 350 mVDC 20 mV to 350 mV B TP1 D30 D29 D30 GND D29 D27 D28 D27 D28 TP2 R136 TP1 B DC 20 mV to 350 mV A Fig. 1 MAIN (1) P.C.B. 26-28 Vp-p 26-28 Vp-p YST-RSW300 9 G Confirmation of AUTO STANDBY operation setting 1) Turn off the “POWER ON/OFF” key located on the rear panel. 2) In order to shorten the time required for operation check; connect a 10 k-ohms resistor at both ends of R45 on the MAIN (2) P.C.B. (Fig. 2) 3) Connect the output signal from the signal generator to the INPUT 2 / L/MONO terminal of the main unit. 4) Set the signal generator for the sine wave of 100 Hz, 8 mV. 5) Turn on the “POWER ON/OFF” key located on the rear panel. 2) Turn on the “STANDBY/ON” key. The status indicator lights up (green) and its color changes to red after 2 to 8 seconds. 3) Turn off the “STANDBY/ON” key. The status indicator goes off. 5) Turn on the “STANDBY/ON” key. The status indicator lights up (green) and its color remains unchanged even after time have elapsed. 6) Turn off the “STANDBY/ON” key. The status indicator goes off. Confirmation 1) Set the “AUTO STANDBY” key to the LOW posi- tion. 4) Set the “AUTO STANDBY” key to the HIGH posi- tion. After confirmation 1) Turn off the “POWER ON/OFF” key. 2) Disconnect the 10 k-ohms resistor connected to both ends of R45. R45 10 k-ohms R45 10 k-ohms 2 ABCDEFGHIJ 1 3 4 5 7 YST-RSW300 6 10 + + PROTECTION Q26-28 F1 RY2 RY2 R60 (U, C, K, A, B, G models) POWER ON/OFF SW5 SUB POWER SUPPLY D3 T1 (R, L models) REGULATOR Q5, Q8 REGULATOR IC202 STANDBY/ON SW4 Q13 +12 -12 IC6 IC1 REGULATOR +B -B POWER SUPPLY D25 POWER SUPPLY D2 PROTECTION D201 D202 D203 RG RY1 0.1 DRIVER WOOFER POWER TRANSFORMER AC IN STATUS INDICATOR -B +B PS AMP PS AMP Q22C, Q24A Q22A, Q24C POWER DRIVE Q17A, Q17C PRE DRIVE Q3-15 + A.N.I.C. IC8 LIMITER Q10, Q12 AUTO STANDBY CIRCUIT C27 8 4 6 7 3 + Q1 TIMER IC201 MUSIC SENSOR IC4 OFF OFF LOW HIGH LOW HIGH AUTO STANDBY SW2 INPUT 2 OUTPUT L/ MONO R