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 ................
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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.
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...
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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...
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.
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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...
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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.
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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.
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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.
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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].
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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.
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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.
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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] ×...
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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.
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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.
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...
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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...
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.
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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.
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...