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Yamaha Disklavier MX-100A Service Manual

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  Summary of Contents for Yamaha Disklavier MX-100A

  • Page 1 MX-100A...
  • Page 2 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.
  • Page 3: Table Of Contents

    CONTENTS The Disklavier Design Specifications Names and Functions • Front Panel • Remorte Control Unit • Connectors How to Format Disks MIDI Data Format MIDI Implementation Chart MIDI Troubleshooting and know-how Warning Displays and error messages Error number meaning Block Diagram Disassembly Procedure Adjustment Procedure •...
  • Page 4: The Disklavier Design

    The Disklavier Design The Disklavier consists of a control unit and a drive unit comprising of a sensor unit, solenoid units, power source unit and I/O control unit. Specifications Design • Key switches Control unit Dot matrix (16 characters x 2 lines) •...
  • Page 5: Names And Functions

    Names and Functions Power Switch Liquid Crystal Display (LCD) Pressing this switch turns power on, shown by The LCD displays a variety of information such the power indicator and the Volume button as the music title, adjustment values, the time that indicator lighting up.
  • Page 6 Rec. button Repeat buttons Pressing this button causes its indicator to light Operate these buttons when you desire repeated up, entering record stand-by mode. Recording can playback of certain pieces of music or sections now be started by pressing the Start/Pause button. within them.
  • Page 7 Part Cancel buttons Trans/Beat When you want to transpose (change) the key It is possible to cancel either the left-hand or of a piece of music for playback, press this button right-hand part by pressing the corresponding Part in stop mode, during playback or playback pause, Cancel button when playing back music recorded making sure that the button's indicator lights up.
  • Page 8: Front Panel

    Remote Control Unit Remote control signal window Start/Pause button Please operate the remote control while making Has the same functions as the Start/Pause sure that this infrared signal transmission window button on the front panel. is aimed at the corresponding reception window on the front panel.
  • Page 9: Connectors

    Return-FF buttons Connectors These buttons are for fast forward and rewind. They can be operated in stop mode or during playback. Fast forward or rewind continues until the respective button is pressed again. Volume buttons These buttons adjust playback volume level. They can be operated in stop mode, during playback or playback pause.
  • Page 10: How To Format Disks

    How to Format Disks After inserting a disk, press the Rec. button while keeping the Stop button depressed. You can release these buttons when the display reads "FORMAT OK?". In answer to the above message, press the Start/Pause button. (If you should decide not to proceed with formatting, remove the disk instead.) Reconfirm the above question by again pressing the Start/Pause button.
  • Page 11: Midi Data Format

    MIDI Data Format Transmission Conditions Transmission Data • CHANNEL INFORMATION 1) CHANNEL VOICE MESSAGES Key On/Off Status 1 0 0 1 n n n n (9n) n = channel number (0~15) Note No. 0 k k k k k k k k = 21 (A ) ~108 (C ): Note 1...
  • Page 12 • SYSTEM INFORMATION 1) SYSTEM REALTIME MESSAGES Note 3: When the preferred data, including active sensing, has been transmitted, if data is not transmitted within an interval of approximately 80 milli seconds, the main clock is transmitted. * The system realtime messages Timing Clock, Start, Continue, and Stop can be transmitted only when the metronome function is ON.
  • Page 13 Reception Conditions Reception Data • CHANNEL INFORMATION 1) CHANNEL VOICE MESSAGES Key Off Status 1 0 0 0 n n n n (8n) n = channel number (0~15) 0 k k k k k k k Note No. k = 21 (A )~108 (C Velocity 0 v v v v v v v...
  • Page 14: Midi Implementation Chart

    MIDI Implementation Chart ( D I S K L A V I E R Date : 2/4, 1986 Model M X 1 0 0 A M I D I I m p l e m e n t a t i o n Chart Version : 1.0...
  • Page 15: Midi Troubleshooting And Know-How

    MIDI Troubleshooting and Know-how When MIDI Is connected, there are a few mistakes and problems that occur frequently. A sound source instrument has been connected to the MIDI OUT terminal, but no sound is produced by the external instrument. • Are you sure the MIDI cable is firmly connected between the MIDI OUT terminal of the Disklavier and the MIDI IN of the external instrument? •...
  • Page 16 Split, transposition functions do not work on the external instrument. • Is the MIDI OUT set to DELAY OUT? (If it is not set to KEYBOARD OUT, these functions will not operate.) • Does the transmission channel of the Disklavier match the reception channel of the external instrument? When playing ensemble music, the external instrument receives all parts.
  • Page 17: Warning Displays And Error Messages

    Warning Displays and Error Messages This Disklavier will display warnings and error messages on its LCD when operation has been incorrect or other problems have arisen. Should this happen, please take the appropriate measures after having found out what the trouble is by referring to the table below. Please note that some of these problems are easy to mistake for malfunctions though they are actually very easy to solve by yourself.
  • Page 18 Error Number and Description in Details When error occurred, the error number will be indicated on the 7 segment LED with pushing the L and R buttons at a time.
  • Page 19: Block Diagram

    Block Diagram...
  • Page 20: Disassembly Procedure

    Disassembly Procedure 1. Removing the Case Parts and Action When tuning: 1) Open and lock the Top Board. 2) Loosen the screws and securing fasteners on the inside of the left Side Board. (See Figure 1.) 3) Remove the Upper Front Board. 4) Remove the Fall Board.
  • Page 21 2. Removing the Electrical Unit: *lf necessary, cut the binding tie. * For connector numbers, refer to the circuit diagram. * Before removing each unit, be sure to disconnect the AC plig. Removing the Control Unit: 12) Remove the following screws shown in Figure 5: the four at (A), the six at (B), the one at (C) and Figure 5.
  • Page 22 Removing the Key Sensor Unit: 19) Remove the Keyboard. 20) Disconnect the three connectors to the unit (CN8, 9, 4). 21) Remove the six screws shown at (A) on Figure 8, and remove the unit. Figure 8. Removing the Key Drive Unit: 22) Remove the fourteen connectors of the I/O Circuit Board (CN8, CN10~22) and the connector of the power source unit (CN8).
  • Page 23 Removing the Pedal Sensor Unit: 28) Remove the connector of the Sensor Circuit Board (CN3). 29) Remove the screws shown in Figure 11, and take out the unit. Figure 11 . Removing the I/O and Sensor Circuit Boards: 30) Remove all of the connectors. 31) Remove the six screws of the Sensor circuit board and the seven screws of the I/O circuit board., and take out the two units.
  • Page 24: Adjustment Procedure

    Adjustment Procedure 1-1. Adjustment of the Key Drive Unit The key drive unit is mounted as shown in the figure below. • Adjustment-Front and Back Fit the unit against the front surface of the key back rail. • Adjustment-Right and Left Instal Keys 2, 50, and 87 (black keys), then align the key drive unit so that each solenoid is at the center of its corresponding key.
  • Page 25: Pedal Drive Unit

    • Height Adjustment Use the mounting screws to adjust the gap between the top of the black keys and the bottom surface of the key stop rail to 0 (visually). 1-3. Adjustment of the Pedal Drive Unit Adjust the wire length so that the gap at section (A) is: 5mm: For the soft pedal 3mm: For the loud pedal After performing adjustment using the ©...
  • Page 26: Pedal Cushion Unit

    1-4. Adjustment of the Pedal Cushion Unit Adjustment of the pedal cushion unit is as folows. Cushion unit is too high···Pedal rebound noise can occur. Cushion unit is too low···Pedal may not disengage.
  • Page 27: Sensor Units

    1-5. Adjustment Procedure for the Sensor Units 1) Settings When Adjusting the Sensors: • Connect MIDI OUT on the DISKLAVIER to MIDI IN on the external sound source and set individual each unit so that transmission and reception of signals is possible. •...
  • Page 28 3) Adjusting the Key Sensor Unit: Depress a white key making sure sound is being produced on the tone generation system. Slowly release the white key and adjust the height adjustment screws (4 locations). The sound source should stop at a height of 4.5±0.5mm (half of key depth) from normal key level. Sound stop timing is too fast···Loosen the screw (counterclockwise) Sound stop timing is too slow···Tighten the screw (clockwise) 4) Adjusting the Pedal Sensor Unit:...
  • Page 29 Operation Test of Each Unit Using The Test Disk [TEST 1] Minimum-pressure single-note scale of 1 to 88 keys. Tests whether the keys are played back when the minimum touch pressure is applied. If a note is not sounded (although the keyboard operates normally):...
  • Page 30 [TEST 2] Standard-pressure single-note scale of 1 to 88 keys. Tests the operation of the key solenoid unit (for noise, etc.). If noise is generated:...
  • Page 31 [TEST 3] Applies pressure onto 5 consecutive keys. Tests the sound generation while playing trills (check for noise, etc.) If sound generation is faulty: If noise is generated: See [TEST 2] [TEST 4] Turns ON the Damper Pedal/Soft Pedal five times for one second each time. Tests the efficacy of the Damper Pedal and Soft Pedal.
  • Page 32 [TEST 5] Turns ON the Damper Pedal ten times for one second each time. Tests the operation of the Damper Pedal (for noise, etc.) If noise is generated: [TEST 6] Demonstration performance. Comprehensively tests all units in the playback system. Re-confirms [TEST 1 ] through [TEST 5] .
  • Page 33 [TEST 7] Recording and playback test. Tests the operation of the units in the recording system (using a disk for recording). Records then plays back the scale of Keys 1 to 88, pedal ON/OFF, and so on. The location of the defect can be determined by the error symptom that occurs, as listed below. •...
  • Page 34: Error Display Leds On The I/O Board

    Error Display LEDs on the I/O Board As shown in the figure below, the I/O board is mounted with LEDs that indicate abnormal operation in the driving system. If an error occurs, the pertinent LED lights up next, after the solenoid power supply is turned OFF, the other LEDs also gradually light up.
  • Page 35: Adjusting The Trimmer

    Adjusting the Trimmer The operating efficiency of the piano action and keyboard will vary slightly according to the piano model. Even if two pianos have the same model number, minute differences may occur due to humidity, adjustment procedures, and other factors. When a person plays the piano, she/he listens to the sound and feels the key touch, then plays while making the necessary compensations.
  • Page 36: Test Program

    Test Program 1. STARTING/ENDING THE TEST PROGRAM Among the two ROMs used for piano player control, ROM B contains the test program. When you simultaneously hold down the L and R buttons while you turn ON the power, TEST mode is entered. Upon entering TEST mode, the ROM Version, Table Version, Trimmer Value, and Controller Type are displayed as shown below.
  • Page 37 4) Switch Test The 7-segment LEDs display the number corresponding to each switch. Foot Switch=40 5) RAM Test Write, Read, and Verify operations are conducted, then the result is displayed. ( O K ! ! / N G ! ! ) 6) ROM Test The checksum of ROM B is calculated, and the result is displayed.
  • Page 38 8) PIANO Test For the play back system, single keys are successively pressed during approximately 0.5 seconds from Key 1. After Key 88 is pressed, the Loud Pedal and Soft Pedal are operated, then the sequence returns to Key 1 and is repeated. During playback, the START/PAUSE, Fast Forward (1-Key Skip), and Fast Reverse can be used.
  • Page 40 * Example 1: "AA" was written to Address $1234, but "00" was read back. * Example 2: During the test, the Track No., Side, and Sector No. being tested are displayed at the lower row of the LCD. • If an error occurs, its description and location are alternately displayed. Error Description Display DISK NOT READY...
  • Page 41: Program Flow-Chart And Memory Map Of Disklavier

    Program Flow-chart & Memory Map of Disklavier...
  • Page 42: Explanation Of Sensor System

    Explanation of Sensor System The sensors on the DISKLAVIER are as follows: • Key Sensor Unit···Optical Sensor···Detects key information. • Hammer Sensor Unit···Optical sensor···Detects key information. • Pedal Sensor Unit···Mechanical sensor···Detects pedal information. 1. Key Sensor Unit, Hammer Sensor Unit: The Key Sensor, Hammer Sensor Units include the following equipment: •...
  • Page 43 This sensor system is used to obtain the key information listed below: Detection contents Detection method Which key is (Key Assign)? OR of K and M1 (see Note 1) When is (Note On Timing)? How strong is (Touch Data)? Time from M1 to M2 (see Note 2) How long is (Note Off Timing)? AND for K and M1 (see Note 3) Note 1: OR···Time during which either key sensor K or hammer sensor M1 has its light blocked by the...
  • Page 44: Lsi Data Table

    LSI Data Table YM5205 (PMAC: Memory Access Controller) 1. OVERVIEW The PMAC contains the CPU peripheral circuit in a 64-pin OIL LSI. It selects addresses in and refreshes the dynamic RAM and also makes communication between the dynamic RAM and the FDC possible in the DMA mode.
  • Page 45 2. CONSTITUENT PARTS The internal circuit in PMAC consists roughly of six parts: DRAM controller···Controls address switching, timing, and memory refreshing DMA controller···Controls DMA transfers between FDC and DRAM Timer control···Controls interrupts generated by the internal timer and external triggers Address decoder···Decodes the addresses from the CPU and generates the address decode signals FDC support circuit···Generates clock signals for FDC and carries out write data precompensation for the disks...
  • Page 46 3. LIST OF PMAC TERMINALS...
  • Page 48 MB8877 (FDC: Floppy Disk Controller) To enter data on a floppy disk, 8 bits of serial data that is sent from the computer, must be converted into the corresponding parallel data. To this, again, the clock pulses must be applied. When reading data from a disk, the same procedure must be repeated, but the reverse order.
  • Page 49 LIST OF MB8877 TERMINALS...
  • Page 50 YM3802 MCS (MIDI Communication & Service Controller) LIST OF YM3802 TERMINAL YM3802 Pin assignment...
  • Page 51 YM2019 KAPP (Key Assigner for Piano Player) 1. OVERVIEW This LSI detects the operation being executed (keys, hammers and pedals) while a piano is being played. Its offers the features listed below: 1) Detects the ON/OFF timing of keys in eight octaves (96keys) and the hammer speed. (For up to 16 concurrently sounded notes.) 2) Detects the ON/OFF status of the damper and shift pedals.
  • Page 52 3. Block Diagram 3-1. Key Scanner Scanning is beginning from the C # note of Octave 0 to detect the status of the hammers within the octave for witch Pin K is "1" (the octave in which a key is being pressed). Key scanning is then stopped for 16µSec.
  • Page 53 3-2. Key Assignor and Level Counter The data from the Key Scanner is assigned to an empty channel among the 16 channels. The operation conforms to the table as shown below, depending to the status of Pins K, M1, and M2. Based on the conversion curve selected by Pins , the Level Counter accumulates in 48µSec.
  • Page 54 3-4. Memory The Memory records the data listed below: The key address (note and octave) and Level Counter value of a Key-On event. The Key address of a Key-Off event. The number (SP1 or SP2) of a special function (pedal). 3-5.
  • Page 55 Description of the Data DO D1 D2 D3 D4 D5 D6 D7 Data Name EV="1" when an event has occurred. INDEX ————INDEX——————0 1 EV EV="0" when no event has occurred. When a Key ON event occurs, key data Key-On Event ——NOTE—————BLOCK———1 and l e v e l data are sent as a p a i r .
  • Page 56 3-7. Timing Chart of , CLK, and DATA...
  • Page 57 YM2020 PKD2 1. OVERVIEW This LSI is an addressable PWM which uses 8-bit data to output pulses having the duty ratio set by data to the specified output pin. This PWM output permits the current flowing to the solenoids to be controlled, thereby allowing control of the piano's key touch.
  • Page 58 YM2020 Pin assignment ADDRESS DATA TABLE When CE is "0", output is enabled when D6 is "0". When CE is "1", output is enabled when D6 is "1".
  • Page 59 • DE (Touch Data Enable) This signal latches the latch information within the data. It modulates the pulse width of the output according to the data (00~7E) during DE = "0" status. D7 represents the Key ON/OFF data. ADDRESS DATA TABLE •...
  • Page 60: Cpu Circuit Board

    CPU Circuit Board...
  • Page 61: I/O Circuit Board

    I/O Circuit Board...
  • Page 62: Sensor, Hammer, Key, M1, K, M2 Circuit Board

    Sensor,Hammer,Key,M1,K and M2 Circuit Board Sensor Circuit Board Hammer LED Drive Circuit Board M1, K Detect Circuit Board M2 Detect Circuit Board Key LED Drive Circuit Board...
  • Page 63: Drive Unit, Midi, Power Supply Circuit Board

    Drive Unit,MIDI and Power Supply Circuit Board MIDI External Circuit Board Power Supply Circuit Board Drive Circuit Board...
  • Page 64 PARTS LIST CONTENTS 1. Electrical Parts 2. Control Unit 3. Key Stop Rail Assembly 4. Key Drive Unit 5. Key Sensor Unit 6. Hammer Sensor Unit, Air Damper Unit 7. Pedal Drive Unit, Pedal Sensor Unit, Pedal Cushion Unit 8. I/O Unit, Power Supply Unit, MIDI Unit...
  • Page 65: Electrical Parts

    1. Electrical Parts Part No. IG136200 IF000040 IF008730 IF008740 VB352400 JX550050 KX550100 KX550640 JX550060 VE470300 iT200200 iT520520 XA591001 XA457001 iG132700 IG057300 iG1 37800 XA513002 iG067210 iG068100 iG096700 iG057400 iG044200 iG049900 iG060000 iG044600 iG050100 iG044000 iG060200 iG050300 iG044400 iG049600 iG049800 iG043700 iG027010 iG026910 iG050000...
  • Page 66 1. Electrical Parts Part No. HZ003350 HZ002940 HZ003370 HZ003380 FZ004100 FP336220 FP336470 iC181520 VA106500 HT370010 KA000240 QU001400 QU003500 FZ006970 VB353000 VB835000 VB293400 KA501760 LB604730 LB021030 LB021050 LB021070 LB916070 LB021110 LB021140 LB021150 LB604400 VB316200 LB932030 LB932040 LB202930 LB500520 LB917080 VE470200 iT202000 iG027010 iG043700 iG049800...
  • Page 67 1. Electrical Parts Part No. iF001840 iF001220 FZ004100 FP337100 FZ000680 iF003940 VB293300 VB293400 iK000420 LB932020 LB932030 LB932040 LB932050 LB932060 LB916030 LB916090 LB916100 LB916110 LB916150 VE470400 iT201900 iG027010 iG043700 iG052800 HZ004700 HL313470 HL314120 HL315470 FZ413680 FZ005030 iC134540 iB059630 iG127300 iF000040 iF001840 VB434900 FZ006970 VB293300...
  • Page 68 1. Electrical Parts 1. Electrical Parts Part No. LB918130 LB918140 VE471200 iG036100 VB434400 VB433900 H2003190 HV753470 FZ005030 CB502590 LB918090 LB918110 VE471300 iG036100 VB434400 VB433900 HZ003190 HV753470 FZ005030 CB502590 LB918090 LB918110 VE471400 VB434100 CB502580 LB918060 LB918070 NB137040 VD617900 IG083400 IG094300 IC181520 IC223840 1X603810 IX554290...
  • Page 69 2. Control Unit 2. Control Unit Part No. VE513200 VF593400 VF610900 VF156400 AA503110 VE513700 VB496400 CX558110 CX558120 CX557810 CX557820 CX557830 CX557840 CX557850 CX557860 CX557870 CX557880 CX557890 CX557900 CX557910 CX557920 CX557930 CX557940 CX558420 CX558450 CX558430 CX558460 CX558440 CX558470 CX558010 CX558020 CX558030 CX558040 CX558050 CX558060...
  • Page 70: Control Unit

    2. Control Unit Part No. EV303046 EI330056 EA026056 VE514700 MZ501260 VE479800...
  • Page 71: Key Stop Rail Assembly

    3. Key Stop Rail Assembly Part No. NB513830 EC050300 AA504060 EV200066 AA504050 AA504040 AA504130 EX600170 EH034020...
  • Page 72: Key Drive Unit

    4. Key Drive Unit Part No. VE479600 CX558200 CX558210 BX550110 BX550120 AX550340 AX550350 CX558220 EA040550 EX550050...
  • Page 73: Key Sensor Unit

    5. Key Sensor Unit Part No. VE479300 CB502790 AA503970 CB502800 CB502650 CB502700 EA330046 ED330306 EV203036 ED330056 ED330086 ED330166 ED330186 BB500690 EH340120 VE471400 VE471200...
  • Page 74: Hammer Sensor Unit, Air Damper Unit

    6. Hammer Sensor Unit, Air Damper Unit 6. Hammer Sensor Unit, Air Damper Unit Part No. VE479200 CB502790 CB502700 CB502600 EA030036 EV200036 ED030046 EA030086 ED030056 BB500670 EA040106 EA040206 EV200046 EA030046 EV200036 NX509820 EH040100 VE470900 VE471200 VE471300...
  • Page 75: Pedal Drive Unit, Pedal Sensor Unit, Pedal Cushion Unit

    7. Pedal Drive Unit, Pedal Sensor Unit, Pedal Cushion Unit 7. Pedal Drive Unit, Pedal Sensor Unit, Pedal Cushion Unit Part No. VE479700 AA504080 AA504590 EV100046 EV300046 NB513260 NB137040 EA030046 EV200036 ED030126 NB513620 EK940406 EX801360 EX600170...
  • Page 76: I/O Unit, Power Supply Unit, Midi Unit

    8. I/O Unit, Power Supply Unit, MIDI Unit...
  • Page 77 8. I/O Unit, Power Supply Unit, MIDI Unit Part No. VE470200 VE470400 EA030066 EV200036 EV300036 EK365020 VD617900 GX550670 MG000820 FX551610 EA040066 EA030066 EA030186 EA030106 EA050066 ED030046 EV200036 EV200056 EV300036 EV300056 EV100036 EH040168 EH040126 VE545200 VE545100 VE512700 AA831250 LB500520 LB202930 EA330066 VE555800 VE545300...
  • Page 78 SM8549...