Yamaha-YSTSW-205-Service-Manual电路原理图.pdf

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1、SERVICE MANUAL SUBWOOFER SYSTEM YST-SW205/305 100768 I CONTENTS TO SERVICE PERSONNEL . 1 SPECIFICATIONS. 2 INTERNAL VIEW . 3 REAR PANELS . 45 DISASSEMBLY PROCEDURES . 6 ADJUSTMENTS.78 BLOCK DIAGRAM. 9 PRINTED CIRCUIT BOARD . 1015 SCHEMATIC DIAGRAM . 1617 PARTS LIST . 1831 IMPORTANT NOTICE This manua

2、l 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:

3、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 p

4、erformed 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 rela

5、tionship 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 s

6、ubject 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 th

7、e 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. YST-SW205/305 P.O.Box 1, Hamamatsu, Japan YST-SW205 YST-SW305 YST-SW205/305 YST-SW205/305 1 WALL OUTLET

8、EQUIPMENT UNDER TEST AC LEAKAGE TESTER OR EQUIVALENT INSULATING TABLE 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 b

9、y 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 an

10、d 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. I TO SERVICE PERSONNEL 1. Critical Components Information Components havin

11、g 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 insula

12、ted from supply circuits. GMeter impedance should be equivalent to 1500 ohm shunted by 0.15F. GLeakage current must not exceed 0.5mA. GBe sure to test for leakage with the AC plug in both polarities. YST-SW205/305 YST-SW205/305 I SPECIFICATIONS YST-SW205YST-SW305 TypeAdvanced Yamaha Active Servo Tec

13、hnology Output Power150 W/100 Hz, 5 10% T.H.D.200 W/100 Hz, 5 10% T.H.D. Input Sensitivity INPUT 1 (SP)0.8 V (50 Hz, 150 W/5, L+R)1.0 V (50 Hz, 200 W/5, L+R) INPUT 2 (PJ)40 mV (50 Hz, 150 W/5, L+R)50 mV (50 Hz, 200 W/5, L+R) Input Impedance INPUT 1 (SP)2.2 k INPUT 2 (PJ)12 k Frequency Response23 Hz

14、170Hz20 Hz 160Hz Driver Unit20 cm (8) cone20 cm (8) cone magnetic shielding type x 1magnetic shielding type x 2 Input Section INPUT 1Speaker terminal INPUT 2RCA pin jack Power Supply U, C modelsAC120V, 60Hz A modelAC240V, 50Hz B, G modelsAC230V, 50Hz R, T modelsAC110/120/220/240V, 50/60Hz Power Cons

15、umption70 W80 W Standby Power Consumption0.8 W0.8 W Dimensions (W x H x D)235 x 485 x 402 mm235 x 585 x 445 mm (9-5/16 x 19-1/16 x 15-13/16)(9-5/16 x 23 x 17-1/2) Weight15 kg (33 lbs. 1 oz.)21 kg (48 lbs. 8 oz.) Finish All modelsBlack color / Cherry color AccessoryNonskid Pad x 4 U . U.S.A. modelC.

16、Canada modelA .Australia modelB . British model G. Europe modelR. General modelT.China model Specifications are subject to change without notice due to product improvements. 235 (9-5/16)351 (13-13/16)19 (3/4) 32 (1-1/4) 402 (15-13/16) 485 (19-1/16) DIMENSIONS 2 235 (9-5/16)394 (15-1/2)19 (3/4) 32 (1

17、-1/4) 445 (17-1/2) 585 (23) Unit : mm (inch) YST-SW205 YST-SW305 YST-SW205/305 YST-SW205/305 3 1 2 3 4 5 6 7 8 9 0 I INTERNAL VIEW 1 MAIN (5) P. C. B. 2 MAIN (4) P. C. B. 3 MAIN (10) P. C. B. 4 MAIN (3) P. C. B. 5 MAIN (9) P. C. B. R, T models only 6 MAIN (8) P. C. B. U, C, A, B, G models MAIN (7) P

18、. C. B. R, T models 1 2 3 4 5 6 8 9 0 7 YST-SW205 YST-SW305 7 MAIN (1) P. C. B. 8 MAIN (2) P. C. B. 9 MAIN (6) P. C. B. 0 Power Transformer YST-SW205/305 YST-SW205/305 70 WATTS I REAR PANELS U, C modelsA modelB, G model R modelT model 4 YST-SW205 YST-SW205/305 YST-SW205/305 5 80WATTS 80WATTS U, C mo

19、delsA modelB, G model R modelT model YST-SW305 YST-SW205/305 YST-SW205/305 3 3 44 4 4 4 4 Extension cable CB3 CB9CB9 2 2 Front Panel Assy Main (5) P.C.B. 1 (Remove parts in the order as numbered.) G For exchanging the driver unit 1. Removal of Front Grille The front grille is fixed to the cabinet wi

20、th dowels at 6 locations. As a screwdriver (for slotted head screw) is used for removal, use special care not to cause damage to the cabinet. a. Apply the block to the rear panel so as to avoid damage to the Terminal of the rear panel. b. Use the screwdriver inserted in the gap between the front gri

21、lle and the cabinet (bottom side first), push up the front grille. (Fig. 1) c. Remove the front grille by lifting it up. (Fig. 1) 2. Removal of Driver unit a. Remove 4 (8 when YST-SW305) screws (1) in Fig. 2, and remove the Driver unit. b. Remove the cable cord. G For repairing P.C.B. Repairing P.C.

22、B. is possible without removing front grille. 1. Removal of Front Panel Assy Remove 2 screws (2) and then remove the Front Panel Assy in Fig. 3. *Use an Allen wrench (3 mm) to unscrew the Front Panel Assy. 2. Removal of Rear Panel Remove 4 screws (3) and 12 screws (4) in Fig. 4, and remove the rear

23、panel. At this time, disconnect the connector CB3 of MAIN (2) P.C.B. *When removing the rear panel, replace the packing. 3. P.C.B. Operation Check a. Disconnect the connector CB9 of MAIN (5) P.C.B. b. Connect the connector CB3 of MAIN (2) P.C.B. and CB9 of MAIN (5) P.C.B. by using an extension cable

24、. (Fig. 4) Extension cable : V7278000 (9P, 700 mm) I DISASSEMBLY PROCEDURES Fig. 1 Fig. 2 Fig. 3 Fig. 4 6 YST-SW205/305 YST-SW205/305 7 I ADJUSTMENTS G Confirmation of Power Amp operation For the power amplifier which has been repaired, it is absolutely necessary to confirm that a correct waveform i

25、s obtained at points indicated by A and B in the schematic diagram according to the following procedure. Devices required Signal generator 8 or 6 load resistor Oscilloscope (dual trace type) Connection 1) Connect the output signal from the signal generator to the input terminal of the unit. 2) Disco

26、nnect the connector terminal connected to the speaker unit and reconnect it to the load resistor. 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. 4) Connect the oscilloscope CH2 input to the red side of t

27、he connector cable, which is connected with the load resistor. At this time, the GND terminal of CH2 must be left unconnected. Setting 1) Set the signal generator to the sine wave, 100Hz and minimum output level settings. 2) Set the volume of the unit to the minimum position. 3) Turn on the power to

28、 the unit. 4) Adjust the output level of the signal generator and the volume of the unit so that the output level observed at oscilloscope CH2 is 28Vp-p. Waveform observation With the settings made as described above, observe the waveform obtained at CH1 for judgment. G Idling Adjustment To stabiliz

29、e 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. Adjust VR1 so that the voltage between terminals TP11 and TP12 is 30mV to 200mV. G Confirmation of AUTO STANDBY operation Setting 1) Turn off the power swit

30、ch. 2) In order to shorten the time required for operation check; connect a 10k resistor at both ends of R60 on the MAIN (3) P.C.B. 3) Connect the output signal from the signal generator to the L/MONO terminal of the unit. 4) Set the signal generator for the sine wave of 100Hz, 8mV. 5) Turn on the p

31、ower switch. Confirmation 1) Set the AUTO STANDBY switch to the LOW position. AUTO STANDBY OFFHIGH LOW 2) Turn on the STANDBY/ON switch. The display LED lights up (green) and its color changes to red after 5 to 10 seconds. 3) Turn off the STANDBY/ON switch. The display LED goes off. 4) Set the AUTO

32、STANDBY switch to the HIGH position. AUTO STANDBY OFFHIGH LOW 5) Turn on the STANDBY/ON switch. The display LED lights up (green) and its color remains unchanged even after time have elapsed. 6) Turn off the STANDBY/ON switch. The display LED goes off. After confirmation 1) Turn off the power switch

33、. 2) Disconnect the 10k resistor connected to both ends of R60. Normal Point A(Cathode of D29) V : 20V/divH : 2 msec/div DC range1 : 1 probe Normal Point B(Anode of D31) V : 20V/divH : 2 msec/div DC range1 : 1 probe Abnormal +B or GND level Becomes constant Abnormal -B or GND level Becomes constant

34、0V 0V YST-SW205/305 YST-SW205/305 Schematic Diagram (Ex.: YST-SW205) Test Points (Ex.: YST-SW205) PS AMPPOWER DRIVE -65.5 -66.7 1.8 65.1 -1.6 -4.2 -4.2 -1.0 -1.0 1.2 1.2 1.8 65.5 4.4 -3.6 -66.7 4.4 66.1 66.1 3.3 -1.6 4.9 0 -2.7 -2.7 -2.7 -66.7 -66.0 -66.7 -66.7 -2.7 -66.7 -66.7 66.1 65.9 65.7 65.9 2

35、.7 66.1 0.6 0.1 -2.7 -2.7 3.3 0 66.1 66.1 66.1 3.3 1.8 -1.6 -1.0 1.2 -1.0 0.6 -0.5 -0.5 -3.3-3.6 0.1 66.1 66.0 0.1 66.0 0 2.7 0.1 -66.7 66.1 66.1 66.1 65.5 2.7 2.7 65.5 2.7 2.7 -66.7 -66.3 -66.7 -69.7 IDLING CURRENT ADJ. DC 30 mV to 200 mV B A Main (1) P.C.B. Main (2) P.C.B. DC 30 mV to 200 mV TP11

36、(+) TP12 (-) VR1 D31 D29 Point APoint B 8 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 9 IC11A IC11B IC7A AUTO STANDBY SW3 AUTO POWER ON/OFF CIRCUIT VR3 VOLUME L.P.F. 6dB/oct B.P.F Q3336 L.P.F. 12dB/oct 3 61 5 76 8 IC7B IC3 Q22, 23 4 2 D8 D17 D9 D18 Q15 2 HIGH CUT VR2 PROTECTION H/L OFF PWR R60 C46 TIMER IC5 M

37、USIC SENSOR IC4 8 4 6 3 7 Q12 PWR REGULATOR IC12 Q11 L R + + INPUT 1 L R INPUT 2 L R + + OUTPUT IC1A 4 3 2 SW2 PHASE SELECT IC1B L.P.F. 12dB/oct 6 8 BASS SELECT SW4 + PRE DRIVE Q210 Q2730 POWER DRIVE Q16A/C, 26A/C A.N.I.C LIMITER RY1 IC8, 9 Q25 D12, 13, 19 Q1821 D6, 14, 33, 34 0.1 Q1C, 17C, 24A Q27,

38、 31 PS AMP Q1A, 17A, 24C Q30, 32 PS AMP B +B H.P.F. 12dB/oct + + +12 12 REGULATOR POWER SUPPLY D2 IC6 IC10 F1 POWER SW5 +B B POWER SUPPLY D1 STANDBY/ON SW1 R, T ONLY REGULATOR Q13, 14 D15 SUB POWER SUPPLY D11 RY2 T1 + SPEAKER YST-SW305 SPEAKER SPEAKER YST-SW205 I BLOCK DIAGRAM YST-SW205/305 ABCDE 1

39、2 3 4 5 6 7 YST-SW205/305 MAIN (1) P. C. B. From MAIN (6) RE RE BL -B1 +B1 E TR-E TR-C TR-B From MAIN (2) From MAIN (2) DR1+ OUT DR2+ DR2- DR1- +V1 AYST SPEAKER SP- SP+ + 18 Q16C Q1CQ9Q1A Q17CQ17AQ16A From MAIN (2) IDLING TEST POINT DC 30 mV to 200 mV A B I PRINTED CIUCUIT BOARD (Foil side) YST-SW20

40、5 10 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 11 MAIN (1) P. C. B. From MAIN (6) RE RE BL -B1 +B1 E TR-E TR-C TR-B From MAIN (2) From MAIN (2) DR1+ OUT DR2+ DR2- DR1- +V1 AYST SPEAKERS SP- SP+ + SP- SP+ 18 Q16C Q1CQ9Q1A Q17CQ17AQ16A From MAIN (2) + IDLING TEST POINT DC 30 mV to 200 mV A B I PRINTED CIUCUIT

41、 BOARD (Foil side) YST-SW305 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 YST-SW205/305 I PRINTED CIUCUIT BOARD (Foil side) YST-SW205YST-SW305 MAIN (2) P. C. B. TOVL E MA1 BASS +V2 +12 -12 PWS VCC MA1 E TOVL BASS +12 -12 LIM MA2 From MAIN (3) From MAIN (4) To MAIN (5) VCC E E PWS +V1 To MAIN (1) DR1+ DR2+ OUT

42、DR2- DR1- AYST +V1 To MAIN (1) +B1 E -B1 To MAIN (1) TR-C TR-B TR-E From MAIN (6) BE BL BE 19 19 IDLING CURRENT ADJ. 12 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 13 I PRINTED CIUCUIT BOARD (Foil side) YST-SW205YST-SW305 1818 81 MAIN (4) P. C. B. AUTO STANDBY PHASE LOWHIGH REVNORM OFF OUTPUT / INPUT 1 INPUT

43、2 LR + 19 From MAIN (3) SML SWH2 SWH1 SO From MAIN (2) MA2 LIM -12 +12 BASS TOVL E MA1 MAIN (3) P. C. B. WH BE U, C, A, B, G models: To MAIN (8) R, T models: To MAIN (7) To MAIN (10) GY OR To MAIN (2) +V1 PWS E E VCC To MAIN (4) SWL SWH2 SWH1 SO 1819 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 YST-SW205/305 M

44、AIN (8) P. C. B. MAIN (6) P. C. B. POWER TRANSFORMER (U, C, A, B, G models) WH BE From MAIN (3) To MAIN (2) BE BL BE RE BL RE To MAIN (1) YST-SW205YST-SW305 I PRINTED CIUCUIT BOARD (Foil side) MAIN (5) P. C. B. STANDBY / ONB.A.S.S.HIGH CUTVOLUME From MAIN (2) TOVL E MA1 BASS +V2 +12 -12 PWS VCC 19 M

45、AIN (10) P. C. B. POWER SW5 From MAIN (3) OR GY 14 YST-SW205/305 ABCDE 1 2 3 4 5 6 7 15 YST-SW205YST-SW305 I PRINTED CIUCUIT BOARD (Foil side) MAIN (6) P. C. B. POWER TRANSFORMER MAIN (7) P. C. B. (R, T models) From MAIN (9) WH RE BL YE BR GR BE BE From MAIN (3) To MAIN (2) BE BL BE RE BL RE To MAIN

46、 (1) MAIN (9) P. C. B. (R, T models) To MAIN (7) VOLTAGE SELECTOR YEBE BLBRREGR 240V1-2/5-6 220V2-3/6-7 110V3-4/7-8 120V4-5/8-1 A 1 2 3 4 5 6 7 8 9 BCDEFGHIJKL YST-SW205/SW305 SCHEMATIC DIAGRAM (YST-SW205) E-16/J-12 INPUT 1 PC4570HA 1 9 M51848L PC1237HA 1 8 NJM79M12FA 1: COM 2: IN 3: OUT NJM78M12FA

47、1: OUT 2: COM 3: IN NJM78L08A OUT COM IN x:? NOT USED O:?USED / APPLICABLE NJM4558L2SA970 2SA1015 2SA1145 2SC1815 2SC2240 2SC2705 2SC2878 EC B 2SK304 E CB PIN CONNECTION DIAGRAM OF TRANSISTORS, DIODES AND ICS. BCE 2SA1837 2SC4793 2SC18462SC4688 2SA1695 2SC4468 1SR139? 1SS133 MTZJ3.6B MTZJ12.0C MTZJ2

48、4.0B S2L20U D3SBA20S1NB20 Anode Cathode IC1, 4, 79 : PC4570HA Dual OP-Amp IC6: NJM78M12FA Voltage Regulator VccVo1-Vm1+Vm1VEE+Vm2-Vm2Vo2Vcc 1?2?3?4?5?6?7?8?9 +- 12 INPUT OUTPUT COMMON IC10: NJM79M12FA Voltage Regulator IC11: NJM4558L Dual OP-Amp IC12: NJM78L08A Voltage Regulator COMMON OUTPUT INPUT 87654321 OUT1 Vcc +IN2