Yamaha MU15 Service Manual
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Yamaha MU15 Service Manual

Yamaha MU15 Service Manual

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SY
011439
19981225-24800
SERVICE MANUAL
CONTENTS
SPECIFICATIONS
PANEL LAYOUT
CIRCUIT BOARD LAYOUT
BLOCK DIAGRAM
DISASSEMBLY PROCEDURE
LSI PIN DESCRIPITION
IC BLOCK DIAGRAM
CIRCUIT BOARDS
TEST PROGRAM
INITIALIZE
............................................................... 24
MIDI/COMPUTER CONNECTING CABLES
............................................................. 25/26
ERROR MESSAGES
MIDI IMPLEMENTATION CHART .......................................... 29
MIDI DATA FORMAT .............................................................. 30
PARTS LIST
OVERALL CIRCUIT DIAGRAM
................................................... 3
.................................... 4
................. 5
............................ 6
.............................. 7
.............................. 8
................................... 9
....................................... 10
............................ 12/18
....................... 27/28
HAMAMATSU, JAPAN
1.9K-545
Printed in Japan '99.01

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  • Page 1 SERVICE MANUAL CONTENTS SPECIFICATIONS ........... 3 PANEL LAYOUT ........4 CIRCUIT BOARD LAYOUT ....5 BLOCK DIAGRAM ......6 DISASSEMBLY PROCEDURE ......7 LSI PIN DESCRIPITION ......8 IC BLOCK DIAGRAM ........9 CIRCUIT BOARDS ........10 TEST PROGRAM ......12/18 INITIALIZE ...............

  • Page 2: Important Notice

    IMPOR TANT 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 under- stood by the users, and have therefore not been restated.

  • Page 3: Specifications

    1 (not editable, stored in ROM) PC-2 — 38,400 bps Display Power Supply Custom LCD (54.5 mm x 29.4 mm) YAMAHA PA-3B AC Power Adaptor (sold separately). Six “AA” size, SUM-3, R-6 or equivalent batteries Controls (sold separately). PART ; VALUE /NO, /YES;...

  • Page 4: Panel Layout

    MU15 PANEL LAYOUT Front Panel Rear Panel Side Panel Display PART buttons ( VALUE buttons ( /NO], YES) XG BANK button PLAY/EDIT button OCTAVE DOWN and OCTAVE UP buttons Keyboard MIDI OUT and MIDI IN terminals HOST SELECT switch TO HOST terminal...

  • Page 5: Circuit Board Layout

    MU15 CIRCUIT BOARD LAYOUT CN03 CN02 CN01 CN03 CN01 Shield sheet CN02 CN02 CN03 CN01 CN03 CN01 IC10 CN02...

  • Page 6: Block Diagram

    MU15 BLOCK DIAGRAM...

  • Page 7: Disassembly Procedure

    MU15 DISASSEMBLY PROCEDURE Bottom Cover Remove the five (5) screws marked [40]. The bottom cover can then be removed. (Fig. 1) DM Circuit Board Remove the bottom cover. (See Procedure 1.) Remove the two (2) screws marked [160]. The DM circuit board can then be removed.

  • Page 8: Lsi Pin Description

    MU15 LSI PIN DESCRIPTION HG73C205FD (XU947A00) SWX000 TONE GENERATOR IC11 NAME FUNCTION NAME FUNCTION Initial clear CMA3 Program address bus RFCLKI PLL Clock CMA8 Program address bus PLL Control CMA2 Program address bus AVDD_PLL Power supply read signal AVSS_PLL Ground...

  • Page 9: Ic Block Diagram

    MU15 µ PD63200GS-E1 (XP867A00) DAC (Digital to Analog Converter) IC02 (PN Circuit Board) NAME FUNCTION NAME FUNCTION 4/8FS 4/8 Fs selection R. REF Channel R voltage reference D. GND Digital ground L. REF Channel L voltage reference 16/8 BIT 16 bit/8 bit selection L.

  • Page 10: Circuit Boards

    MU15 CIRCUIT BOARDS DM Circuit Board to PN-CN03 to PN-CN01 to PN -CN02 OUT-MIDI-IN HOST SELECT to HOST DC IN ON/STANDBY Component side Pattern side Note: See parts list for detaile of circuit board component parts. 2NA-V291520...
  • Page 11 MU15 PN Circuit Board to DM-CN01 to DM-CN03 to DM-CN02 LINE OUT/ PHONES VOLUME Component side PART NO -1 VALUE +1 YES XG BANK PLAY EDIT MSTR VELO LOCL DUMP INIT NOTE SOLO MUTE TUNE CITY CTRL SHFT DOWN SEND...

  • Page 12: Test Program

    MU15 TEST PROGRAM PREPARATIONS When testing MU15, the following measuring instruments and jigs are required. Measuring instruments: distortion meter (with 20 kHz LPF), frequency counters (input impedance 1 Mohm or more), oscilloscope (input impedance 1 Mohm or more), level meter (JIS-C curve, input impedance of more than 1 Mohm, 0 dBm:1 mW 600 ohm), keyboard amplifier.
  • Page 13 Pressing without selecting the test will start the test from [1. RAM] test. TEST SELECTION WHEN AN ERROR IS DETECTED In each test, if an NG (No Good) error is detected, press the [PLAY/EDIT] button. The MU15 will then wait for the entry of a test number.
  • Page 14 B, [PROCEEDING TROUGH THE TEST]. LCD-ALL DOT “ON” TEST L C D Check that all dots of the LCD change to black. After checking the back light, press the [BANK] button. Then the MU15 will proceed to enter the following test.
  • Page 15 MU15 The switch & LED test proceeds in the order as shown below. 18 17 16 15 14 11 10 9 If the switch is OK, a beep will sound and the test will proceed to the next switch. If the wrong switch is pressed, the program will not proceed and no sound will be heard.
  • Page 16 1 kHz +/-3 Hz, SIN wave, -5.5 +/-2 dBm (33 ohm load), distortion 0.1 % or less (20 kHz LPF ) LINE OUT/PHONES (R): -75 dBm or less Press the [BANK] button. The MU15 will automatically proceed to the next test. 10. 1 kHz SOUND OUTPUT R TEST 1 k H z R...

  • Page 17: Items To Be Checked

    The factory preset data will be restored. If you press [BANK], the factory setting’s will be restored and will then shift to C-12. The MU15 will exit the test mode. To remain in the test program, press [PLAY/EDIT], then the MU15 will wait for a entry of the test number.
  • Page 18 MU15...
  • Page 19 MU15...
  • Page 20 MU15...
  • Page 21 MU15...
  • Page 22 MU15...
  • Page 23 MU15...
  • Page 24 MU15. CAUTION • Using Initialize All will erase whatever settings you’ve made on the MU15. If you have important settings you wish to keep, store them to a MIDI data recorder with the Dump Out function. Operation Simultaneously hold down the PLAY/EDIT button and press the INIT ALL button.

  • Page 25: Midi/Computer Connecting Cables

    MU15 MIDI/COMPUTER CONNECTING CABLES MIDI Standard MIDI cable. Maximum length 15 meters. DIN 5-PIN DIN 5-PIN 2 (GND) Macintosh Apple Macintosh Peripheral cable (M0197). Maximum length 2 meters. 2 (HSK i) MINI DIN MINI DIN 1 (HSK o) 8-PIN 8-PIN 5 (RxD –)
  • Page 26 MU15...

  • Page 27: Error Messages

    MU15 ERROR MESSAGES Errors may occur from time to time, and when they do the MU15 will display a message to indicate the type of problem so that you can rectify it and return to normal operation. “Battery” The battery voltage is too low for proper operation. Replace the old batteries with a set of new ones.
  • Page 28 MU15...
  • Page 29 MU15 YAMAHA [ Tone Generator ] Date:19-OCT-1998 Model MU15 MIDI Implementation Chart Version : 1.0 Transmitted Recognized Remarks Function ... Basic Default 1 - 16 1 - 16 Channel Changed 1 - 16 1 - 16 Default Mode Messages 3, 4 (m=1)

  • Page 30: Midi Data Format

    Sound Note On/Off (Key On/Off) Module mode (XG or TG300B), Part param- These tell the MU15 which notes to play and eters, effect types and parameters, and various how long they are to be played. Velocity values other settings.
  • Page 31 MU15 < MIDI TRANSMIT/RECEIVE FLOW > (1)TRANSMIT FLOW <CHANNEL VOICE MESSAGE> MIDI OUT [SW1] NOTE ON/OFF <SYSTEM EXCLUSIVE MESSAGE> <XG PARAMETER CHANGE> XG SYSTEM F0H 43H 10H 4CH ggH mmH llH ssH...F7H MULTI EFFECT1 F0H 43H 10H 4CH ggH mmH llH ssH...F7H MULTI PART F0H 43H 10H 4CH ggH mmH llH ssH...F7H...
  • Page 32 MU15 AEG RELEASE TIME BnH 63H 01H 62H 66H 06H mmH DRUM INST FILTER CUTOFF FREQ. BnH 63H 14H 62H rrH 06H mmH FILTER RESONANCE BnH 63H 15H 62H rrH 06H mmH AEG ATTACK RATE BnH 63H 16H 62H rrH 06H mmH...

  • Page 33: Channel Messages

    MU15 1. Channel messages •Effect1 Parameter 7. MW VARIATION CONTROL DEPTH This device transmits only NOTE ON and NOTE OFF. (Valid when Variation Effect is assigned to a part as Insertion) 1.1 Note on/note off By default, an LFO Pitch Modulation (PMOD) effect will apply.
  • Page 34 MU15 •Rcv SOFT PEDAL= OFF With a value of 0 there will be no sound, and with a value of •PART MODE=DRUM,DRUMS1,2 127 the volume will be maximum. 1.2.12 Harmonic Content 1.2.8 Hold1 This message adjusts the resonance of the filter that is This message controls sustain pedal on/off.
  • Page 35 MU15 1.2.16 Portamento Control NRPN Data Entry *1 MSB LSB MSB LSB Parameter name and value range This message specifies the portamento source key number (the 01H 08H mm – – *2 Vibrato rate key number at which portamento will begin).
  • Page 36 MU15 1.2.22 RPN (Registered parameter number) 1.3.1 All Sound Off This message is used to specify part parameters such as Pitch This message silences all currently-sounding notes on the Bend Sensitivity or Tuning etc. as an offset value. corresponding channel.

  • Page 37: System Exclusive Messages

    (Valid when Variation Effect is assigned to a part as settings of the MU15 from an external MIDI device. Insertion) The device number of the MU15 is fixed to “All”. And when By default, the Pitch Control effect is applied. sending these messages, it is fixed to “0”.
  • Page 38 This device will transmit this message when it receives the 2.1.2.1 General MIDI System On Identity Request message of 2.1.2.2. This system exclusive message causes the MU15 to function as a tone generator that is compatible with GM System Level 2.1.3 XG parameter change This message sets XG-related parameters.
  • Page 39 Address Low 0000mmmm Master Tune MSB Chorus effect type to “Flanger1”. 0000llll Master Tune LSB * Any number is OK, since the device number for the MU15 is 0xxxxxxx don’t care fixed to “All”. 11110111 End of Exclusive Be sure to allow enough time for the procedure to take...

  • Page 40: Realtime Messages

    MU15 3. Realtime messages 2.2.1.3 Multi Effect1 bulk dump 3.1 Active sensing This message sets the MULTI EFFECT1 block (refer to tables <1 - 1>, <1 - 4>). This message is used to prevent problems which could occur if a MIDI cable were to be disconnected or broken 2.2.1.4 Multi Part bulk dump...
  • Page 41 MU15 < Table 1 -1 > Parameter Base Address MODEL ID = 4C Parameter Description Remarks Address XG SYSTEM System Drum setup Reset Receives parameter changes only XG System On Receives parameter changes only All Parameter Reset Receives parameter changes only...
  • Page 42 MU15 < Table 1 - 4 > MIDI Parameter Change table ( EFFECT 1) Address Size Data Parameter Description Default value 00 - 7F REVERB TYPE MSB refer to Effect Type List 01(=HALL1) 00 - 7F REVERB TYPE LSB refer to Effect Type List...
  • Page 43 MU15 Address Size Data Parameter Description Default value 00 - 7F VARIATION PARAMETER 9 MSB refer to Effect Parameter List 00(depends on variation type) 00 - 7F VARIATION PARAMETER 9 LSB refer to Effect Parameter List 00(depends on variation type)
  • Page 44 MU15 < Table 1 - 6 > MIDI Parameter Change table ( MULTI PART ) Address Size Data Parameter Description Default value 00 - 20 ELEMENT RESERVE 0...32 part10 = 0 other parts =2 00 - 7F BANK SELECT MSB 0...127...
  • Page 45 MU15 Address Size Data Parameter Description Default value 00 - 7F SCALE TUNING C -64...0...+63[cent] 00 - 7F SCALE TUNING C# -64...0...+63[cent] 00 - 7F SCALE TUNING D -64...0...+63[cent] 00 - 7F SCALE TUNING D# -64...0...+63[cent] 00 - 7F SCALE TUNING E -64...0...+63[cent]...
  • Page 46 -64...0...63 TOTAL SIZE n:Drum Setup Number(0 - 1) rr:note number(0D - 5B) In the following cases, the MU15 will initialize all Drum Setups. XG SYSTEM ON received GM SYSTEM ON received DRUM SETUP RESET received (when in XG mode) NOTE When a part to which a Drum Setup is assigned receives a program change, the assigned Drum Setup will be initialized.
  • Page 47 PARTS LIST CONTENTS OVERALL ASSEMBLY ..........2 ELECTRICAL PARTS ......... 4~7 Notes : DESTINATION ABBREVIATIONS : Australian model M : South African model : British model O : Chinese model C : Canadian model Q : South-east Asia model D : German model : Taiwan model : European model U : U.S.A.

  • Page 48: Overall Assembly

    MU15 OVERALL ASSEMBLY...
  • Page 49 MU15 PART NO. DESCRIPTION REMARKS REF NO. RANK OVERALL ASSEMBLY MU15 (V325330) V 3 2 5 9 7 0 0 Top Cover V 3 2 5 9 8 0 0 Bottom Cover V 3 2 5 9 9 0 0...

  • Page 50: Electrical Parts

    MU15 ELECTRICAL PARTS PART NO. DESCRIPTION REMARKS REF NO. RANK ELECTRICAL PARTS MU15 V 2 9 1 5 3 0 0 Circuit Board (XV393B0) V 3 2 5 5 7 0 0 Circuit Board (XV392B0) V 2 9 1 5 3 0 0...
  • Page 51 MU15 PART NO. DESCRIPTION REMARKS REF NO. RANK RD256100 Carbon Resistor (chip) 1.0K 0.1 J RD255150 Carbon Resistor (chip) 150.0 0.1 J RD254680 Carbon Resistor (chip) 68.0 0.1 J RD257470 Carbon Resistor (chip) 47.0K 0.1 J RD258100 Carbon Resistor (chip) 100.0K 0.1 J...
  • Page 52 MU15 PART NO. DESCRIPTION REMARKS REF NO. RANK IC01 XV492A00 UPC2905T-E1 REGULATOR +5V IC02 XP883A00 NJU7201U32TE1 REGULATOR +3.2V IC03 XU965A00 UPC29M33T-E1 REGULATOR +3.3V IC04 X I 2 9 7 A 0 0 TC74HCT04AF-T1 INVERTER  IC05 XV103A00 M5M34051FP LINE TRNSCEIVER ...
  • Page 53 MU15 PART NO. DESCRIPTION REMARKS REF NO. RANK RD257220 Carbon Resistor (chip) 22.0K 0.1 J RD257220 Carbon Resistor (chip) 22.0K 0.1 J RD257100 Carbon Resistor (chip) 10.0K 0.1 J RD257220 Carbon Resistor (chip) 22.0K 0.1 J RD256100 Carbon Resistor (chip) 1.0K 0.1 J...
  • Page 54 MU15 MU15 OVERALL CIRCUIT DIAGRAM HOST SELECT INVERTER INVERTER BLM31A700SPT LINE TRANSCEIVER BLM31A700SPT BLM31A700SPT BLM31A700SPT BLM31A700SPT BLM31A700SPT INVERTER Photo Coupler SYSTEM RESET BK2125HS 601-T INVERTER BK2125HS 601-T SRAM 256K ON/STANDBY REGULATOR DC IN Battery+ Battery- (shield sheet) SRAM 1M REGULATOR...

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