Yamaha MS300 Service Manual Download Page 11 | Manualshive

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MS300

11

CIRCUIT BOARDS

AMP Circuit Board

Component side

3LP-X0155A0

Notes: VR201, VR202: Idling Adjustment VR.

Note: See parts list for details of circuit board component parts.

CN203: to Woffer (1,2pin)

CN201: to MIX 1/3-CN103

CN202: to Transformer

CN203: to Tweeter (3,4pin)

www. xiaoyu163. com

QQ 376315150

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TEL 13942296513

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TEL 13942296513 QQ 376315150 892498299

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

http://www.xiaoyu163.com

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Summary of Contents for MS300

Page 1: ...OCK DIAGRAM 4 PANEL LAYOUT 5 CIRCUIT BOARD LAYOUT 6 WIRING 7 DISASSEMBLY PROCEDURE 8 IC BLOCK DIAGRAM 10 CIRCUIT BOARDS 11 INSPECTIONS 14 OVERALL CIRCUIT DIAGRAM 17 PARTS LIST MS300 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiao...

Page 2: ...ly power to the unit 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 E...

Page 3: ...IC 50 dB Input impedance LINE 30 kΩ MIC 5 kΩ Controls LEVEL MASTER MIC LINE EQ LOW 0 Max 8 dB Min at 55 Hz HIGH 3 dB HF Power switch On Off Connectors all balanced LINE in out XLR 3 31 XLR 3 32 phone They are all connected in parallel and can be used as line outputs MIC in XLR 3 31 POWER indicator Green LED Power Requirement USA and Canada 120 V 60 Hz Europe 230 V 50 Hz Others 240 V 50 Hz Power Co...

Page 4: ... LF HF SPEAKER SPEAKER Line Input Output LOW EQ HIGH EQ Phone Jack HPF MIX 2 3 MIX 1 3 AMP IC102 Q101 Q102 2 1 3 2 1 3 2 1 3 3 1 2 IC101 CN101 CN103 VR105 VR103 VR104 VR102 VR101 CN201 CN203 CN102 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 co...

Page 5: ...connector MIC control MASTER LEVEL control POWER indicator EQ control Rear Panel www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 6: ...3 3 MIX 2 3 MIX www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 7: ...rmer CN104 AC IN V824770 V824760 AMP MIX MIX 3 3 MIX 6P 6P 6P 6P 3P www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 8: ...1 To remove the horn driver remove the four 4 screws marked 110 Then remove the speaker with the bracket Fig 1 3 3 2 Remove the two 2 screws marked 100 The horn driver can then be removed from the bracket Fig 1 3 4 Remove the three 3 screws marked 80b The diaphrage assembly can then be removed Fig 1 70 Hexagonal Bolt 5 0 X 35 MFZN2BL V6389200 100 Bind Head Screw 1 4 2ouncx 3 8 V6289600 110 Bind He...

Page 9: ... amplifier assembly See Procedure 1 4 2 Remove the screws and the knob from each circuit board which can then be removed Fig 2 5 Power transformer Time required 7 min 5 1 Remove the amplifier assembly See Procedure 1 5 2 Remove the four 4 screws marked 100 The power transformer can then be removed Fig 2 100 Bonding Tapping Screw B 4 0 X 12 MFZN2BL V7242900 110 Bonding Head Tapping Screw B 3 0 X 12...

Page 10: ... assembly See Procedure 1 7 2 Remove the AMP circuit board See Step 4 2 7 3 Remove the three 3 screws marked 140 The heat sink can then be removed Fig 2 NJM2068L D XM356A00 NJM4580L XF195A00 Operational Amplifier MIX IC101 IC103 IC104 IC105 IC106 IC107 IC108 MIX IC102 1 A 2 3 4 5 6 7 8 IN V IN OUT A A A V IN IN OUT B B B B 10g 10f www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9...

Page 11: ...rcuit board component parts CN203 to Woffer 1 2pin CN201 to MIX 1 3 CN103 CN202 to Transformer CN203 to Tweeter 3 4pin www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 12: ...n side www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 13: ...Q HIGH POWER 3LP X0367A0 MIX1 3 Circuit Board MIX2 3 Circuit Board Component side MIX3 3 Circuit Board Component side Component side www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 14: ...gnal is applied It should be within 70mV both at LF between Pins 1 and 2 and at HF between Pins 3 and 4 4 Gain Efficiency Input a 500Hz 1dBu signal to the input terminal Line INPUT XLR and check that the output voltage at the output terminal LF is 25 1dBu Also check that the primary side power consumption at this time is 110 20W 5 Full harmonic distortion Input a 500Hz signal to the input terminal...

Page 15: ...osition as standard 0dB MAX 3 2 5dB 1dB MIN 3 3 2dB 1dB 9 EQ low change characteristic Input a 50kHz 20dBu signal to the input terminal LINE INPUT XLR move the EQ low VR and check that the output voltage measured at the output terminal LF then is as follows using the output voltage when the VR is at the MAX position as standard 0dB MIN 10 7 5dB 1dB 10 MIC input Input a 500Hz 55dBu signal to the in...

Page 16: ...ation noise occurs Next input music signals to the input terminal LINE INPUT XLR move each VR knob and check that the sound volume and tone quality change smoothly without producing noise 2 Phase of speaker output Check that the output at LF is in positive phase with respect to the input signal and the output at HF is in negative phase with respect to the input signal www xiaoyu163 com QQ376315150...

Page 17: ...21567 MS300 OVERALL CIRCUIT DIAGRAM 1 2 AMP MS300 MS300 MS300 Note See parts list for details of circuit board component parts Mylar Capacitor Ceramic Capacitor Mica Capacitor Metal Film Resistor Metal Oxide Film Resistor Flame ProofC Resister Capacitor w w w x i a o y u 1 6 3 c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 1394...

Page 18: ...OW HIGH POWER LINE OUT LINE IN PHONE LINE IN X0169A00 X0170A00 X0171A00 X0172A00 6 5 4 3 1 2 H A B G F C D E A H G B C F E D MS300 OVERALL CIRCUIT DIAGRAM 2 2 MIX 1 3 2 3 3 3 MS300 MS300 MS300 w w w x i a o y u 1 6 3 c o m Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 8...

Page 19: ...T Taiwan model U U S A model V General export model 110V W General export model 220 N X General export model Y Export model A Australian model B British model C Canadian model D German model E European model F French model H North European model I Indonesian model J Japanese model POWERED SPEAKER MS300 Components having special characteristics are marked and must be replaced with parts having spec...

Page 20: ...10h 70 60 40 160 190 220 170 180 10i 190d 190c 190a 190b 10e 10g 10c 10d OVERALL ASSEMBLY www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 21: ...Holder V608620 100 Bind Head Screw 1 4 20UNCX3 8 2 01 110 Bind Head Tapping Screw P 5 0X30 MFZN2BL 4 01 120 I Bolt 6 MFZN2Y 04 130 Connector Assembly SP V792590 150 Bind Head Tapping Screw P 5 0X50 MFZN2BL 16 01 160 Bind Head Screw 4X16 MFZN2BL 20 01 170 Felt A V791820 180 Felt B V791830 2 190 Front Grille Assembly J 190a Front Grille V789710 190b Badge 190c Push Nut SPN 4 2 01 190d Cushion V70545...

Page 22: ...00 110 200 50 160 30 150 130 20 3 3 20 2 3 20 1 3 90 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 23: ...3 0X12 MFZN2BL 12 01 120 Bind Head Screw SP 3 0X8 MFZN2Y 4 01 130 Bonding Tapping Screw B 3 0X8 MFZN2BL 8 01 140 Bonding Tapping Screw B 4 0X8 MFZN2BL 3 01 150 Bind Head Screw A4 0X8 MFZN2BL 01 160 Rear Panel J 160 Rear Panel U V 160 Rear Panel H B W 160 Rear Panel A 170 Knob MX GREEN D GRAY EQ LOW HIGH 2 01 180 Knob ORANGE D GRAY LEVEL LINE MIC 2 01 190 Knob RED D GRAY MASTER LEVEL 01 200 Power S...

Page 24: ...apacitor 0 1 50V J C250 Mylar Capacitor 0 1000 100V M 01 C251 Mylar Capacitor 0 1000 100V M 01 C252 Electrolytic Cap 6800 80V 08 C253 Electrolytic Cap 6800 80V 08 C254 Mylar Capacitor 3 3000 250V K 05 C255 Mylar Capacitor 3 3000 250V K 05 C256 Mylar Capacitor 0 1 50V J C257 Mylar Capacitor 0 1 50V J C260 Electrolytic Cap 4 7 100 0V C261 Electrolytic Cap 4 7 100 0V C262 Mylar Capacitor 0 33 250V M ...

Page 25: ...istor A1492C3856 Z 210 06 Q229N Pair Transistor A1492C3856 Z 210 06 Q229P Pair Transistor A1492C3856 Z 210 06 Q230 Transistor 2SC5395 E F 01 236 Transistor 2SA1371 D E 01 Q237N Pair Transistor A1859A C4883A 04 Q237P Pair Transistor A1859A C4883A 04 Q238N Pair Transistor A1492C3856 Z 210 06 Q238P Pair Transistor A1492C3856 Z 210 06 Q239N Pair Transistor A1859A C4883A 04 Q239P Pair Transistor A1859A...

Page 26: ... 0K 1 4 J 01 R292 Carbon Resistor 5 6K 1 4 J 01 R293 Carbon Resistor 5 6K 1 4 J 01 R294 Flame Proof C Resistor 22 0 1 4 J 01 R295 Flame Proof C Resistor 22 0 1 4 J 01 R296 Flame Proof C Resistor 2 2K 1 4 J 01 R297 Flame Proof C Resistor 2 2K 1 4 J 01 R298 Flame Proof C Resistor 150 0 1 4 J 01 R299 Flame Proof C Resistor 150 0 1 4 J 01 R300 Flame Proof C Resistor 2 2 1 4 J 01 303 Flame Proof C Resi...

Page 27: ...0V J C138 Mylar Capacitor 0 012 50V J 01 C139 Ceramic Capacitor F 0 0100 50V Z 01 C140 Ceramic Capacitor F 0 0100 50V Z 01 C141 Mylar Capacitor 3300P 50V J 01 C142 Ceramic Capacitor F 0 0100 50V Z 01 C143 Ceramic Capacitor F 0 0100 50V Z 01 C144 Mylar Capacitor 0 015 50V J 01 C145 Ceramic Capacitor F 0 0100 50V Z 01 C146 Ceramic Capacitor F 0 0100 50V Z 01 C147 Monolithic Mylar Capacitor 0 27 50V ...

Page 28: ...al Film Resistor 3 3K 1 4 F R134 Metal Film Resistor 11K 1 4 F 05 R135 Metal Film Resistor 20K 1 4 F 05 R136 Metal Film Resistor 10K 1 4 F 01 R137 Metal Film Resistor 3K 1 4 F 01 R138 Carbon Resistor 18 0 1 4 J 01 R139 Metal Film Resistor 15K 1 4 F 01 R140 Metal Film Resistor 15K 1 4 F 01 R141 Metal Film Resistor 680 0 1 4 F 01 R142 Metal Film Resistor 120K 1 4 F R143 Metal Film Resistor 1K 1 4 F ...

Page 29: ...Variable Resistor B 50 0K RD09F113 EQ HIGH 01 Power Transformer J Power Transformer UL U V Power Transformer CEE H B W Power Transformer A Speaker 30cm 4ohm Horn Driver 5cm 16ohm 22 Diaphragm Assembly 16 V5521500 V5521500 V6062600 V5521500 V5521600 X0169A00 X0170A00 X0171A00 X0172A00 X0539A00 JAY20610 NBE20610 www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 ...

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