Yamaha MU128, Service Manual

Page 1: ...L LAYOUT 3 SPECIFICATIONS 4 CIRCUIT BOARD LAYOUT 6 WIRING BLOCK DIAGRAM 7 DISASSEMBLY PROCEDURE 8 CIRCUIT BOARDS 11 LSI PIN DESCRIPTION 13 IC BLOCK DIAGRAM 15 TEST PROGRAM 18 INITIALIZE 26 ERROR MESSAGES 28 CONNECTING CABLES 29 MIDI IMPLEMENTATION CHART 30 PARTS LIST OVERALL CIRCUIT DIAGRAM ...

Page 2: ...ther 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 REASON WHAT SO EVER 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 enclo...

Page 3: ...IL UTILITY button B EFFECT button C EQ button D MUTE SOLO button E ENTER button F EXITbutton G PART buttons H SELECT buttons I VALUE buttons J Data dial K SELECT button L PART GROUP button M Display N LEDs 1 MIDI terminals 2 HOST SELECT switch 3 TO HOST terminals 4 DC IN terminals 5 Power cord hook 6 OUTPUT L R jacks Left Right 7 INPUT L R jacks Left Right 8 XG Plug in board expansion bay l Front ...

Page 4: ...r MIDI controller 2 COMPONENT Internal Voice Normal Voice Total 1342 XG 1099 TG300B 664 Drum Voice Total 47 XG 37 TG300B 10 Perfomance Programs Up to four Voices plus all effect settings can be memorized to a Performance Preset Programs 100 User Programs 100 Effects Reverb 12 Types Chorus 14 Types Variation 70 Types Insertion 1 2 43 Types Multi EQ 5 Types 3 DISPLAY LCD Custom back lit LCD LED 10 4...

Page 5: ...ard expansion bay 6 POWER SUPPLY Yamaha PA 6 AC Adaptor included 7 DIMENSIONS W X D X H 219 5 W X229 5 D X91 1 H mm 8 5 8 X9 X3 1 2 8 WEIGHT 1 9Kg 4 lbs 3 oz 9 SUPPLIED ACCESSORIES Owner s Manual Sound List Book MIDI Data Book AC Adaptor PA 6 CD ROM XG tools 10 OPTIONAL ACCESSORIES XG Plug in board Virtual Acoustic Plug in Board PLG100 VL Vocal Harmony Plug in Board PLG100 VH Advanced DX TX Plug i...

Page 6: ...MU128 6 CN1 CN2 CN4 CN9 CN5 CN6 CN7 CN8 CN10 CN12 CN11 CN13 2NC V248430 Rear l Bottom View l Front View Front ...

Page 7: ...7 7 7 7 7 MU128 MU128 MU128 MU128 MU128 28C99 8812612 LCD 28CA1 8812501 ...

Page 8: ...Procedure 1 4 2 Remove the two 2 screws marked 30 The front assembly can then be removed Fig 2 4 3 Remove the five 5 screws marked 100 The LEDSW1 circuit board can then be removed Fig 4 4 4 Remove the four 4 screws marked 80A The LEDSW2 circuit board can then be removed Fig 4 4 5 Remove the four 4 screws marked 80B The LED can then be removed Fig 4 4 6 Remove the two 2 screws marked 120 and the en...

Page 9: ...driver to loosen it at first so that it can be fastened and removed simply by using your fingers 3 Remove the XG Plug in board from its protective packaging Before handling the XG Plug in board make sure to discharge any static electricity from your body or clothes by touching a grounded metal surface Also be careful not to touch any parts or connectors of the board 4 Insert the board along the gu...

Page 10: ...over with the screw you removed in step 2 Latch the hinges on the cover to the inside of the expansion bay and secure the cover to the rear panel with the screw Press the cover down with your hand for the sponge cushion on the back of the cover to hold the installed board s securely in place M ID I TH R U O U T IN A IN B H O ST SELEC T M ID I M ac PC 2 PC 1 TO H O ST D C IN O U TPU T IN PU T L R S...

Page 11: ...PMD CN1 CN2 CN9 to LEDSW1 CN8 to LEDSW1 CN10 CN8 to LEDSW2 CN3 CN6 to RE CN9 CN1 4 5 to Plug in board to LCD CN7 CN13 to Power SW Assembly CN11 to PMD CN2 CN12 to ADMVR2 CN5 CN10 to ADVR1 CN7 2NA1 V227130 Note See parts list for details of circuit board component parts Connection of the cable bundles to the CN9 of the DM circuit board is shown right 0 ...

Page 12: ...Organ Guitar Bass Strings MU PLG 1 PLG 2 PLG 3 to DM CN8 Component side Pattern side LEDSW2 Circuit Board A D INPUT ADVR1 Circuit Board 1 to DM CN10 to ADMVR2 CN4 Component side Pattern side 2 ADMVR2 Circuit Board VOLUME Component side Pattern side Pattern side Component side PMD Circuit Board RE Circuit Board to DM CN11 to DM CN2 PHONES MIDI IN A to DM CN6 Dial Component side Pattern side Note Se...

Page 13: ...dress bus 110 PE1 O NC 39 A20 O 111 PE2 O LCD control LCD RS 40 VCC Power supply 112 VCC Power supply 41 A21 O Address bus 113 PE3 O Latch for reset LCREAD 42 VSS Ground 114 PE4 O LCD control LCD E 43 RD O Read 115 PE5 O 1M clock for mac 44 WDTOVF NC 116 PE6 O Clock for PB serial SICLK 45 D31 I O Data bus 117 VSS Ground 46 D30 I O Data bus 118 AN0 I A D input level R 47 WRH O High write 119 AN1 I ...

Page 14: ...ta input 179 LMD7 I O Wave memory data bus Lower 16 bits 60 VDD I Power supply 180 VDD Power supply 61 VSS Ground 181 VSS Ground 62 KONI2 I 182 LMD8 I O 63 KONI3 I 183 LMD9 I O 64 DAC0 O DAC output 184 LMD10 I O 65 DAC1 O 185 LMD11 I O 66 WCLK O DAC0 DAC1 word clock 186 LMD12 I O 67 MELO0 O 187 LMD13 I O 68 MELO1 O 188 LMD14 I O 69 MELO2 O 189 LMD15 I O 70 MELO3 O MEL wave data output 190 VSS Grou...

Page 15: ...ain clock 7 D6 I O 21 RESET I Reset 8 D7 I O 22 DSR I 9 TxCLK I Transmitter clock 23 RTS O MODEM control 10 WR I Write control 24 DTR O 11 CS I Chip select 25 RxCLK I Receive clock 12 C D I 26 VDD Power supply 5V 13 RD I Read control 27 D0 I O Data bus 14 RxRDY O Receive ready 28 D1 I O Data bus PCM1800 XU770A00 A D Converter PIN NO NAME I O FUNCTION PIN NO NAME I O FUNCTION 1 VINL I Analog input ...

Page 16: ...MU128 16 ...

Page 17: ...MU128 17 ...

Page 18: ...RAM 29 PB3 RAM A TEST ENTRY To turn ON the equipment press the STAND BY ON button while pressing the PLAY and MUTE SOLO buttons at one time MU128 TEST MODE Ver Ver shows the version number of the product program ROM Precautions before starting the test Before starting a test immediately after the end of the assembly or battery replacement press STAND BY ON while pressing the UTIL and ENTER buttons...

Page 19: ... finished you will go to the next test If you think that the switch being tested has fails in the test turn OFF the equipment once and restart the test 6 DIAL 06 DIAL Right 0 10 00 Make that the dial is working properly Slowly turn the dial clockwise until a value of 10 is obtained for 00 on the LCD When the value 10 is obtained the next item illustrated below will appear 06 DIAL Left 0 10 00 Slow...

Page 20: ...ance with the host name displayed on the LCD and make sure that the switch is functioning properly Displaying the test result OK 11 HOST SELECT ok NG None 12 TO HOST TX RX 12 TO HOST The test is for factory inspection before shipment The test will not be performed here Testing without a test specific jig will result in an error To eliminate any error refer to B Starting the tests 13 WAVE ROM 13 WA...

Page 21: ...inal connected to the ground terminal When A D INPUT VOLUME is set at maximum make sure that the specified values shown below are obtained for OUTPUT L and R OUTPUT L 65 dBm or less OUTPUT R 4 dBm 2 dB Load 10 k ohm Distortion factor 0 25 or less When A D INPUT VOLUME is set at minimum make sure that the specified value shown below is obtained for OUTPUT R OUTPUT R 70 dBm or less Set A D INPUT VOL...

Page 22: ... that the proper audible signal is heard for each of the 128 channels Also make sure that the sine wave being output has the proper waveform L ch 1 kHz R ch 2 kHz Before starting the test set the master volume at maximum at the time During the test the following information will appear on the LCD 19 128ch OUT Lch xx Rch xx xx Channel number with the audible signal being produced Ending the test Pr...

Page 23: ... kHz 3 Hz 3 2 dBm 2 dBm PLG100 VL 1 kHz 3 Hz 2 0 dBm 2 dBm PLG100 VS 1 kHz 3 Hz 0 8 dBm 2 dBm PLG100 XG Ending the test Press the ENTER button You will then go to the next test When testing the MU128 use PLG100 VH 24 PB2 NAME Note 2 For tests 24 to 27 connect the PB to the CN4 before turning ON the equipment 24 PB2 NAME A request for the board name and version is sent from the MU to the PB through...

Page 24: ...ment 28 PB3 NAME 28 PB3 NAME A request for the board name and version is sent from the MU to the PB through the MU PB communications signal line The information obtained from the PB is then displayed on the LCD Make sure that the communications signal line for the CN 1 of the DM sheet is functioning properly and check the board name and version Displaying the test result OK 28 PB3 NAME PLG100 VL V...

Page 25: ...z 3 2 dBm 2 dBm PLG100 VL 1 kHz 3 Hz 2 0 dBm 2 dBm PLG100 VS 1 kHz 3 Hz 0 8 dBm 2 dBm PLG100 XG 32 FACTORY SETTINGS 32 FACTORY SET When the ENTER button is pressed the individual data will be changed to the factory settings and you will exit the test mode When pressing the EXIT button you will return to the screen for selecting the desired test numbers without changing the data to the factory sett...

Page 26: ...ou sure appears in the display 5 Press the ENTER button to excute the operation When the operation is completed The MU128 will then return to the Initialize menu 3 To cancel the operation press the EXIT button The MU128 will then returns to the Initialize menu l Since the Initialize functions replace existing data you should save any and all important settings to a data storage device or YAMAHA MD...

Page 27: ...res the settings below Multi Part Control Multi All Part Control Multi Part Edit Effect Equalizer Performance mode settings cannot be initialized 4 PFMInit Performance Initialize Its parameter will be available when Sound Module mode PFM is currently selected This restores Performance Edit Buffer Performance internal memory cannot be initialized 5 DrumInit Drum Initialize Its parameter will be ava...

Page 28: ...ta probably because too much data was received too quickly If possible avoid sending unnecessary data and reduce the amount of data sent to the MU128 Rcv CH Is OFF The selected parameter for use with the Show MIDI Data function cannot be converted to a MIDI message value since the Receive Channel for the Part is off Set the Receive Channel to an appropriate value Select BANK Or PGM First This mess...

Page 29: ... Maximum length 2 meters Connecting to an IBM PC AT Serise Computer PC 1 8 pin MINI DIN to D SUB 25 pin cable If your PC 1 type computer has a 9 pin serial port use the PC 2 type cable Maximum length 1 8 meters PC 2 8 pin MINI DIN to D SUB 9 pin cable Maximum length 1 8 meters Connector Pin Number ...

Page 30: ...l 71 74 x o 1 Sound Controller 84 x o 1 Portamento Cntrl Change 91 93 94 x o 1 Effect Depth 96 97 x o 1 RPN Inc Dec 98 99 x o 1 NRPN LSB MSB 100 101 x o 1 RPN LSB MSB Prog x o 0 127 Change True System Exclusive o 3 o 3 Song Pos x x Common Song Sel x x Tune x x System Clock x x Real Time Commands x x Aux All Sound Off x o 120 126 127 Reset All Cntrls x o 121 Mes Local ON OFF x x sages All Notes OFF...

Page 31: ...ecifications equal to those originally installed Note DESTINATION ABBREVIATIONS J Japanese model A Australian model U U S model E European model C Canadian model D German model X General model B British model M South African model I Indonesian model H North European model O Chinese model The numbers in QTY shows quantities for each unit The parts with in Part No are not available as spare parts PA...

Page 32: ...MU128 2 ...

Page 33: ...ver Circuit Board Circuit Board Bind Head Tapping Screw B Rear Shield Contact Tape L Contact Tape S Bottom Board Assembly Bottom Assembly Board Assembly Bind Head Tapping Screw B Bottom board Assembly Bottom cover Cover Sponge Cover Edge Cover A Edge Cover B Edge Cover C Screw Rear Panel Sheet Foot Bind Head Screw Cord Column Bind Head Tapping Screw B Board Assembly Angle Board Guide Rail Rail Spa...

Page 34: ...MU128 4 ...

Page 35: ...ly Circuit Board Rubber Switch Bind Head Tapping Screw B Circuit board Bind Head Tapping Screw B Encoder Assembly Circuit Board Angle Encoder Bind Head Tapping Screw B Button VR Bitton Mode OP Button Key top button Key top button Key top button Key top button Key top button Key top button Key top button Key top button Key top button Cable LCD LCD Sponge ADMVR2 PMD 2 6X6 MFZN2Y SDDLB1216A J U C S 3...

Page 36: ...hic Ceramic Cap Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Electrolytic Cap chip Tantalum Capacitor Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap E...

Page 37: ...ic Cap Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Electrolytic Cap chip Monolithic Ceramic Cap Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monol...

Page 38: ...eramic Cap Electrolytic Cap chip Electrolytic Cap chip Monolithic Ceramic Cap Electrolytic Cap chip Monolithic Ceramic Cap Electrolytic Cap chip Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Electrolytic Cap chip Electrolytic Cap chip Electrolytic Cap chip Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Monolithic Ceramic Cap Electrolytic Cap chip Electro...

Page 39: ...C410T TC74HC4050AF T1 SI 8050S TC7S66F TC74HC14AF TP1 TC7S32F UPC2908T E1 M62021FP TC74HC32F T1 TC74HC14AF TP1 TC74HC126AF TC4W53F MC34051MEL M5M34051FP SC7SU04FEL TC74HCU04AF TP1 TC74HC14AF TP1 M5M51008BFP 70LLT HD6437043E00F NJU7660M T1 M5M51008BFP 70LLT UPD71051GU 10 E2 450V105 TC74HC4051AF TP 450V105 UPC4570G2 UPC4570G2 TC74HC74AF NJM78L05UA UPC4570G2 TC74HC245F T1 SN74HC273NSR UPC4570G2 UPD63...

Page 40: ...istor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resi...

Page 41: ...hip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor ch...

Page 42: ...ip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chip Carbon Resistor chi...

Page 43: ...ble Holder Connector Assembly Connector Assembly Connector Base Post Connector Assembly Cable Holder Cable Holder Cable Holder Encoder DIN Connector Phone Jack Phone Jack Phone Jack LED LED Push Switch Push Switch Push Switch Push Switch Push Switch Push Switch Push Switch Push Switch Rotary Variable Resistor Rotary Variable Resistor Lithium Battery LCD Push Switch 68X4 4 7KX4 4 7KX4 10KX4 10KX4 6...

Page 44: ...MU128 MU128 28CC1 8812500 1 2 4 Note See parts list for details of circuit board component parts ...

Page 45: ...ote See parts list for details of circuit board component parts 28CC1 8812500 2 2 1 ADMVR2 28CC1 8812502 1 RE 28CC1 8812502 1 PMD 28CC1 8812502 1 ADVR1 28CC1 8812502 1 LED SW1 28CC1 8812502 1 LED SW2 28CC1 8812502 1 ...