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Yamaha Clavinova CLP-955 Service Manual

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SERVICE MANUAL
CONTENTS
SPECIFICATIONS .................................................................... 3
PANEL LAYOUT ........................................................................ 4
UNIT LAYOUT ........................................................................... 6
UNIT LAYOUT and WIRING ..................................................... 7
DISASSEMBLY PROCEDURE ................................................. 8
LSI PIN DESCRIPTION .......................................................... 19
IC BLOCK DIAGRAM .............................................................. 21
CIRCUIT BOARDS ................................................................. 22
TEST PROGRAM ................................................................... 30
INSPECTIONS ........................................................................ 32
MIDI IMPLEMENTATION CHART ........................................... 33
PARTS LIST
OVERALL CIRCUIT DIAGARAM
BLOCK DIAGRAM
This document is printed on chlorine free (ECF) paper with soy ink.
CL
001646
1.33K-2721 I. T
Printed in Japan '00.9

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  Summary of Contents for Yamaha Clavinova CLP-955

  • Page 1: Table Of Contents

    SERVICE MANUAL CONTENTS SPECIFICATIONS ..............3 PANEL LAYOUT ................ 4 UNIT LAYOUT ................6 UNIT LAYOUT and WIRING ............. 7 DISASSEMBLY PROCEDURE ..........8 LSI PIN DESCRIPTION ............19 IC BLOCK DIAGRAM .............. 21 CIRCUIT BOARDS ..............22 TEST PROGRAM ..............30 INSPECTIONS ................
  • 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: Specifications

    CLP-955 SPECIFICATIONS KEYBOARD 88 KEYS (A-1 ~ C7) POLYPHONY 64 NOTES MAX. VOICE SELECTORS 12 voices REVERB ROOM, HALL 1, HALL 2, STAGE EFFECT CHORUS, PHASER, TREMOLO, DELAY TOUCH SENSITIVITY HARD, MEDIUM, SOFT, FIXED SONG CONTROLS TRACK 1, TRACK 2, SONG [START/STOP], REC SOFT, SOSTENUTO, DAMPER PEDAL CONTROLS MASTER VOLUME, BRILLIANCE, DEMO, TRANSPOSE, FUNCTION,...
  • Page 4: Panel Layout

    CLP-955 PANEL LAYOUT Front Panel MASTER VOLUME BRILLIANCE VOICE GRAND GRAND E. PIANO E. PIANO HARPSI- VIBRA- DEMO REVERB EFFECT TOUCH PIANO 1 PIANO 2 CHORD PHONE BRIGHT ROOM CHORUS HALL 1 PHASER HARD HALL 2 TREMOLO MEDIUM STAGE DELAY SOFT TRANS- CHURCH...
  • Page 5 CLP-955 Pedals SONG TEMPO/FUNCTION/SONG METRO- FUNC- TRACK TRACK PRESET TION SONG NOME TEMPO SONG START/ STOP SELECT – FUNCTION / NO / YES Soft pedal Damper pedal Sostenuto pedal Bottom Panel MIDI THRU MIDI PC-1 PC-2 L/L+R L/L+R AUX OUT AUX IN TO HOST HOST SELECT...
  • Page 6: Unit Layout

    CLP-955 UNIT LAYOUT ¡Top View Music rest assembly Top board assembly (big) Top board assembly (small) Side cover assembly Key cover assembly Panel assembly End block assembly Keyboard assembly ¡Front View Front rail assembly Log assembly Pedal box assembly...
  • Page 7: Unit Layout And Wiring

    CLP-955 UNIT LAYOUT and WIRING ¡Top Inside View W-SP-L W-SP-R T-SP-L T-SP-R NET1 CN730 CN610 MA120 CN220 CN710 CN520 CN810 CN240 CN720 CN510 A-JACK CN200 D-JACK CN210 PEDAL FU120L CN101 PN-L PN-R CN301 CN201 CN202 CN302 KSN2 AEXL88-L AEXL88-H Headphones assembly MA120 assembly Jack unit FU120 L assembly...
  • Page 8: Disassembly Procedure

    CLP-955 DISASSEMBLY PROCEDURE Speaker Grill Assembly and Top Board (Small) Assembly 1-1. Put up and set the music stand. (Fig. 1) 1-2 Open the top board (big) assembly and remove the speaker grille assembly. (Fig. 1) 1-3 Remove the five (5) screws marked [89] with the top board (big) assembly open.
  • Page 9 CLP-955 Circuit Board & Unit Remove the speaker grille assembly and top board (small) assembly and then the following screws. Each circuit board and unit can then be removed. Circuit Board & Unit Ref.No. Description Parts No. DM Circuit Boatd [85] Bind Head Tapping Screw-1 3.5X12 MFZN2BL EP030340...
  • Page 10 CLP-955 A-JACK Circuit Board 3-1 Remove the speaker grille assembly and the top board (small) assembly. (See Procedure 1.) 3-2 Remove the JACK unit. (See Procedure 2.) 3-3 Remove the four (4) screws marked [4A]. The A-JACK circuit board can then be removed. (Fig. 3) D-JACK Circuit Board 4-1 Remove the speaker grille assembly and the top board (small) assembly.
  • Page 11 CLP-955 MA120 Circuit Board 6-1 Remove the speaker grille assembly and the top board (small) assembly. (See Procedure 1.) 6-2 Remove the MA120 assembly. (See Procedure 2.) 6-3 Remove the five (5) screws marked [1B], the four (4) screws marked [2], and the one (1) screw marked [3]. The MA120 circuit board can then be removed.
  • Page 12 CLP-955 Panel Assembly 10. PNL Circuit Board 8-1 Remove the speaker grille assembly and the top board (small) assembly. (See Procedure 1.) 10-1 Remove the speaker grille assembly and the top board 8-2 Remove the key cover assembly (See Procedure 7.) (small) assembly (See Procedure 1.) 8-3 Remove the four (4) screws marked [88] and the two 10-2 Remove the key cover assembly.
  • Page 13 CLP-955 14. HP JACK Assembly 14-1 Remove the speaker grille assembly and the top board (small) assembly. (See Procedure 1.) 14-2 Remove the key cover assembly. (See Procedure 7.) 14-3 Remove the panel assembly. (See Procedure 8.) 14-4 Remove the end block assembly (Left). (See Procedure 12.) 14-5 Remove the two (2) screws marked [85].
  • Page 14 CLP-955 17. FRONT RAIL Assembly 18. PL Circuit Board 17-1 Remove the speaker grille assembly and the top board 18-1 Remove the speaker grille assembly and the top board (small) assembly. (See Procedure 1.) (small) assembly. (See Procedure 1.) 17-2 Remove the key cover assembly. (See Procedure 7.) 18-2 Remove the key cover assembly.
  • Page 15 CLP-955 20. BLOCK TOP 20-1 Remove the speaker grille assembly and the top board 20-6 Remove the front rail assembly. (See Procedure 17.) (small) assembly. (See Procedure 1.) 20-7 Remove the side cover assembly. (See Procedure 19.) 20-2 Remove the key cover assembly. (See Procedure 7.) 20-8 Remove the eight (8) screws marked [81] and the eight 20-3 Remove the panel assembly.
  • Page 16 CLP-955 A Pattern B Pattern [89] Partition board assembly [89] SP Connector assembly SP Connector assembly [89]: Truss Head Tapping Screw 4.0 × 18 MFZN2BL (V6696000) (Fig. 15) 24. PEDAL Assembly 24-1 Remove the four (4) screws marked [4] at the bottom PK connector assembly [4] ×...
  • Page 17 CLP-955 25. LEG Assembly (Note) 25-1 Remove the pedal box assembly together with the pedal Two or more persons should be involved in the removal pillars. (See Procedure 25.) of the leg assembly. 25-2 Remove the one (1) screw marked [5]. Then remove For removal of the leg assembly, lay a soft cloth over the leg assembly C.
  • Page 18 CLP-955 White key Spring Hammer white key Stopper L88 Spring Round Hook (Rod: TX00670) (Fig. 21) (Fig. 22) (Fig. 23) Hammer white key 27. Reassembling the GH Keyboard Assembly 27-1 Hammer white key (hammer black key) Stopper L88 Insert the hammer white (black) key into the frame on the back of the GH key board assembly and attach the stopper L88.
  • Page 19: Lsi Pin Description

    CLP-955 LSI PIN DESCRIPTION HG73C205AFD (XU947C00) SWX00B DM: IC101, 210 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 CMA1 Program address bus MODE0...
  • Page 20 CLP-955 PCM1716E (XU829A00) DAC (Digital to Analog Converter) DM: IC610 NAME FUNCTION NAME FUNCTION LRCK Vcc1 Analog power supply (+5V) DATA Data input VOUTL Lch, analog voltage output Bit clock CLKO Clock input EXTL Lch, analog output Clock input AGND2L Analog ground clock out Vcc2L...
  • Page 21: Ic Block Diagram

    CLP-955 IC BLOCK DIAGRAM LA6517M-TE-R (XT131A00) SN74AHCT139NSR (XZ525A00) MM74HC00SJX (XW105A00) Dual Low Voltage Operational Amplifier TC74ACT139FEL (XZ519A00) TC74HCT00AF(EL) (XY120A00) A-JACK: IC140 DEMULIPLEXER Duad 2 Input NAND DM:IC450 DM: IC340 Inverting Output A Input A Non-Inverting Input A Inverting Output B Input B Non-Inverting Input B...
  • Page 22: Test Program

    CLP-955 TEST PROGRAM 1. Measuring Condition The following measuring instruments/ jigs are required for testing the main unit. Measuring instruments : Level meter (IHF-C curve) : Frequency counter NOTE 1: Input impedance should be 1M or more. NOTE 2: Unless otherwise specified, connect 33 ohm load using a stereo plug and measure at PHONES terminal.
  • Page 23 CLP-955 LED display (Initial) Test functions and judgement criteria T13:PIT Checks PITCH. Carrying out the test produces sine waves (441 +/- 0.2 Hz). T14:Output R Checks output. (1KHz) AUX OUT L/L+R:- 60 dBm or less AUX OUT R:- 5 dBm +/- 2 dB PHONES L:- 40 dBm or less, PHONES R:- 11 dBm +/- 2 dB T15:Output L Checks output.
  • Page 24: Inspections

    CLP-955 INSPECTIONS 1. Checking PHONES and AUX OUT 1- 1 With 1 kHz, - 20 dBm sine wave in AUX IN L / L +R, check that AUX OUT output is as follows with no signals on AUX R. AUX OUT L / L +R - 10 dBm +/- 2 dB AUX OUT R - 60 dBm or less PHONES L - 14 dBm +/- 2 dB PHONES R - 40 dBm or less...
  • Page 25: Midi Implementation Chart

    CLP-955 MIDI INPLEMENTATION CHART YAMAHA [Clavinova] Date: 1 March, 2000 Model: CLP-955 Version: 1.0 Function Transmitted Recognized Remarks Basic Default Channel Changed 1-16 1-16 Default Poly Mode only Mode Messages Altered ***************** Note 9-120 0-127 Number: True voice ***************** 21-108...