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Technics SX-PR950P Service Manual
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Technics SX-PR950P Service Manual

Technics SX-PR950P Service Manual

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ORDER NO. EMID0309005C1
A4
Digital Ensemble
SX-PR950P
Colour
(K) ...................Black
SPECIFICATIONS
SPECIFICATIONS

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Summary of Contents for Technics SX-PR950P

  • Page 1 ORDER NO. EMID0309005C1 Digital Ensemble SX-PR950P Colour (K) ....Black SPECIFICATIONS SPECIFICATIONS...
  • Page 2 88 KEYS KEYBOARD SOUND GENERATOR 64 NOTES MAX.POLYPHONY SOUNDS NUMBER OF SOUNDS: 1025 SOUNDS ( 990 SOUNDS + 2 ORGAN DRAWBARS + 33 DRUM KITS) PIANO GROUP: GRAND, UPRIGHT, ELECTRIC, MODERN SOUND GROUP: STRINGS, VOCAL, GUITAR & HARPSI,BRASS, SAX & WOODWIND, ORGAN &...
  • Page 3 Supported MUSIC STYLE ARRANGER Supported SOUND ARRANGER Supported PIANO STYLIST Supported ONE TOUCH PLAY Supported TECHNI-CHORD 3 BANKS X 8 PANEL MEMORY SEQUENCER 16 TRACKS RESOLUTION: 1/96 PER BEAT STRAGE CAPACITY: APPROX.40000 NOTES (10 SONGS MAX.) INPUT MODES: EASY RECORD, REALTIME RECORD, STEP RECORD FUNCTIONS: RECORD &...
  • Page 4 EASY EDIT, TONE, PITCH, SOUND EDIT FILTER, AMPLITUDE, LFO, EFFECT, CONTROLLER MEMORY: 40,1 USER DRUM KIT PART SETTING, CONTROL MIDI MESSAGES, REALTIME MESSAGES, COMMON SETTING, INPUT/OUTPUT SETTING, MIDI PRESETS, MODE SETTING DISPLAY LCD: PAGE, CONTRAST, EXIT, DISPLAY HOLD, OTHER PARTS/ Supported HELP Supported...
  • Page 5 precautions, and also those listed in the Owner'sManual. 2. Parts which have a mark in the circuit diagram or in the parts list are essential for safety. When replacing these parts, be sure to use only the specified parts. 3. Use the specified types for internal wiring (double-insulated wiring, etc.).
  • Page 6 4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. 5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the customer from being exposed to a shock hazard. 2.2.
  • Page 7 7. Parts location Fig-3 Fig-4...
  • Page 8 8. Disassembly instructions 8.1. Removing the top cover 1. Remove the top cover A fixing pin as shown in Fig-5 2. Lift up the top cover A. 3. Remove the top cover B mounting screws (A × 4 pcs.) as shown Fig-5 4.
  • Page 9 screws (A. × 3 pcs.). 3. Remove the guide rail lids from the guide rails. 4. Match the gears of the keyboard cover with the notches in the guide rail, and lift up the keyboard cover as shown in Fig-6 Fig-6 8.3.
  • Page 10 1. Remove the control panel (see step “Removing the control panel 2. Remove the keyboard assembly mounting screws located on the bottom of the cabinet (A × 10 pcs.) as shown in Fig-8 Fig-8 8.5. Key(s) Disassembly 1. Remove the keyboard assembly (see step “Removing the keyboard assembly ”).
  • Page 11 Assembly 1. Insert the front part of the key into the chassis. 2. Insert the plate spring into the hammer notch as shown in Fig-10 3. While slowly lowering the key into the chassis, insert the plate spring into the notch at the rear of the key. 4.
  • Page 12 1. Remove the LCD mounting screws (B × 4 pcs.). CPL P.C.B. 1. Remove the CPL P.C.B. mounting screws (C × 17 pcs.). INV P.C.B. 1. Release the claws of the 3 P.C.B. holder. CPR P.C.B. 1. Remove the CPR P.C.B. mounting screws (D × 14 pcs.). Fig-12 8.8.
  • Page 13 3. Remove the headphone jack mounting nuts (E x 3 pcs.). 4. Remove the MIC VOL knob. 5. Remove the MIC VOL mounting nuts (F x 1 pc.). 8.9. Removing the Disk Drive unit 1. Remove the keyboard cover (see step “Removing the keyboard cover ”).
  • Page 14 8.10. Removing the Speaker boxes, woofer speakers and tweeter speakers - Remove the keyboard cover (see step “Removing the keyboard cover ”). Removing speaker box 1. Remove the speaker box mounting screws (I x 6 pcs.). Removing woofer speaker 1. Remove the speaker box . 2.
  • Page 15 The service diagnostic function makes it possible to determine whether the various test modes pass or fail. The test modes are completely independent of one another. Select a test mode as necessary, and run the test. To set to the service diagnostic mode: 1.
  • Page 16 - The test result (OK or NG) is displayed within twenty seconds. If the test result is NG, not only the respective IC, but also a break or short circuit in the ADDRESS/DATA BUS as well as in any of the strobe signal lines may be the causeof thefailure.(refer to Fig.17 9.2.
  • Page 17 Fig.20 - Insert a formatted floppy disk into the Disk Drive. Press the START button to begin the test. - The test is carried out repeatedly. Data is saved and loaded, and then the two data sets are compared. The number of times that the test results in OK or NG are counted and displayed on the LCD.
  • Page 18 - After all the buttons have been pressed, all the PANEL MEMORY LEDs light. If all switches are OK, “ALL DEVICE OK” is shown on the LCD. (If a switch is defective, nothing is shown.) (refer to Fig.21 - To light all the LEDs, press and hold the DEMO button. If an LED fails to light, the LED may be defective or there may be a break in the surrounding circuit.
  • Page 19 9.7. In & Out interface test Fig.23 - The operation status of each input action part can be confirmed. If the part is operating properly, “OK” is shown, excluding the Expression Pedal. (refer to Fig.23 - When a keyboard key is pressed, the corresponding pitch and velocity aftertouch is displayed (only as long as the key is depressed).
  • Page 20 are compared and the MIDI terminal operation is indicated as being OK or NG. (refer to Fig.24 - If NG is shown, check both the IN and OUT terminals, as well as the circuit. 9.9. WAVE ROM test Fig.25 - Press the EXECUTE button to start the test. - The test result (OK or NG) is displayed within thirty seconds.
  • Page 21 1. Generate a full amplitude sine wave in the pitch of each key. (No touch, fixed stereo center). If no sound is generated or if the sound is distorted, the sound generator ROM corresponding to the key position is defective. 2.
  • Page 22 diagnostic function ”). The WAVE ROM output will then be output asasine wave to facilitate the servicing check. 10.2. Important safety notice - Components identified by a mark have special characteristics important for safety. - When replacing any of these components, use only manufacture’s specified parts.
  • Page 23 Electrolytic Capacitors. (ECEA-type, ±20% Tolerance) Table-2 SYMBOL SPECIFICATION TYPE Non-Polarized Electrolytic ECEA_KN_type Capacitors Non-Polarized Electrolytic (for ECEA_Y_type Network system) Tantalum Solid Electrolytic ECS_type Capacitors Metallized Plastic Film Capacitors ECQV_type (TF Series) Temperature Compensating ECC_type Ceramic Capacitors High-Dielecytric Constant Ceramic ECK_type, ECR_type Capacitors Axial Lead Ceramic Capacitors ECB_type...
  • Page 24 11.2. Measuring condition of AS P.C.B. Check Point 3 - 8 Set to the Self-diagnostic Mode followings. - While pressing two E keys simultaneously, turn on the power switch. - SOUND: BRASS - MAIN VOLUME: Max. - Keyboard: C4 Check Point 1,2 Set to the Initial mode (refer to “Owners manual ”).
  • Page 25 12. Schematic diagram 13. Printed circuit board 14. Block diagram 15. Wiring connection diagram 16. Replacement parts list Notes: *Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc.
  • Page 26 Ref. No. Part No. Part Name & Description Remarks SBNG7050A KNOB QKWG028AC LCD PANEL QMRG2052AA COVER QGPG0118ED CONTROL PANEL QMFG1283AA FELT QGUG1347BA BUTTON A QGUG1348CA BUTTON B QGUG1349BA BUTTON C QGUG1350BA BUTTON D QGUG1351BA BUTTON E QGUG1352DA BUTTON F QGUG1352EA BUTTON G QGUG1353DA BUTTON H...
  • Page 27 Ref. No. Part No. Part Name & Description Remarks T984167L7RIC SLIDE COVER <PASC>*1 51-1 QGKG0095AD ORNAMENT 51-2 QMFG1258AA FELT 51-3 QMRG7031EC PROTECTOR(L) 51-4 QMRG7032EC PROTECTOR(R) 51-5 QMFG1259AA FELT 51-6 XTB4+10B SCREW 51-7 XTT4+12AFZ SCREW 51-8 XTT4+10A SCREW 51-9 QXQG007AA AXLETREE 51-10 QMRG7056AA HOLDER...
  • Page 28 Ref. No. Part No. Part Name & Description Remarks QMWG1041AA WHITE KEY(FIRST OCT A KEY QMWG1042AA WHITE KEY(B KEY) QMWG1043AA WHITE KEY(C KEY) QMWG1044AA WHITE KEY(D KEY) QMWG1045AA WHITE KEY(E KEY) QMWG1046AA WHITE KEY(F KEY) QMWG1047AA WHITE KEY(G KEY) QMWG1048AA WHITE KEY(A KEY) QMWG1049AA WHITE KEY(TOP OCTAVE C KE...
  • Page 29 Ref. No. Part No. Part Name & Description Remarks 925330193 SCREW 3.5X30(BLACK) <PASC>*1 5396082L7 SUPPORT FOR TOP COVER <PASC>*1 150029C HINGE <PASC>*1 925316297 SCREW <PASC>*1 150042 HINGE FOR TOP COVER <PASC>*1 925335193T SCREW 3.5X35(BLACK) <PASC>*1 92541629D SCREW 4X16(GOLD COLORED) <PASC>*1 92532529D SCREW <PASC>*1...
  • Page 30 Ref. No. Part No. Part Name & Description Remarks ECJ1VG1H101J 100P ECJ1VB1C104K 0.1U ECJ1VB1A224K 0.22U C4-10 ECJ1VB1C104K 0.1U ECJ1VB1H103K 0.01U C12-15 ECJ1VB1C104K 0.1U ECJ1VG1H030C ECJ1VB1C104K 0.1U ECJ1VG1H030C C19-22 ECJ1VB1C104K 0.1U C23-26 ECJ1VG1H101J 100P ECJ1VG1H221J 220P C28-32 ECJ1VB1C104K 0.1U C35,36 ECJ1VB1C104K 0.1U ECJ1VB1C104K 0.1U...
  • Page 31 Ref. No. Part No. Part Name & Description Remarks C230,31 ECJ1VB1C104K 0.1U C232 EEVHB0J101P 6V 100U C233 ECJ1VB1C104K 0.1U C234,35 EEVHB1H1R0R 50V 1U C236 ECJ1VB1H222K 2200P C238,39 ECJ1VB1A224K 0.22U C241 ECJ1VG1H102J 0.001U C242 ECJ1VG1H101J 100P C243,44 ECJ1VG1H470J C245,46 ECJ1VB1C104K 0.1U C247 EEEFK1J470P 63V 47U...
  • Page 32 Ref. No. Part No. Part Name & Description Remarks C0JBAN000098 MN103002A 32BIT MICRO CONTROLLER TC7SH02FU C0JBAD000071 C0JBAE000140 C0ZBZ0000667 SPECTRAM IC C0JBAA000255 T74VHC08FTL C0JBAA000117 IC10,11 C3ABMG000166 16MDRAME IC12,13 RFKFXPR950 FLASH ROM IC14 C3ZBP0000006 64M FLASH ROM IC18 TC7W32FUTL C0JBAE000098 IC21,22 C0JBAF000232 IC23 C3EBDC000020 EEPROM(2K)
  • Page 33 Ref. No. Part No. Part Name & Description Remarks Q206 2SB0709ARL TRANSISTOR Q207 2SD0601AQL TRANSISTOR Q208 2SB0709ARL TRANSISTOR Q209 2SB14400RL TRANSISTOR Q210 2SD21850HL TRANSISTOR Q211 2SD0601AQL TRANSISTOR Q212 2SB0709ARL TRANSISTOR R1,R2 ERJ3GEYJ101 D0GB101JA002 ERJ3GEYJ102V ERJ3GEYJ472V 4.7K ERJ3GEYJ104 100K ERJ3GEYJ102V ERJ3GEYJ104 100K ERJ3GEYJ472V 4.7K...
  • Page 34 Ref. No. Part No. Part Name & Description Remarks R134,35 ERJ3GEYJ472V 4.7K R137 ERJ3GEYJ472V 4.7K R139 ERJ3GEYJ222V 2.2K D0GB222JA002 R140 ERJ3GEYJ103V D0GB103JA002 R141 ERJ3GEYJ223V D0GB223JA002 R142 ERJ3GEYJ473V D0GB473JA002 R143 ERJ3GEYJ222V 2.2K D0GB222JA002 R144 ERJ3GEYJ331V R145 ERJ3GEYJ472V 4.7K R201-04 ERJ3GEYJ221V R205 ERJ3GEYJ105V R206,07 ERJ3GEYJ101...
  • Page 35 Ref. No. Part No. Part Name & Description Remarks R276,77 ERJ3GEYJ102V R301 ERJ3GEYJ105V R302-06 ERJ3GEYJ470V R307 ERJ3GEYJ472V 4.7K R308 ERJ3GEYJ221V R309,10 ERJ3GEYJ470V R311 ERJ3GEYJ221V R312 ERJ3GEYJ470V R313-19 ERJ3GEYJ221V R321-26 ERJ3GEYJ221V R328,29 ERJ3GEYJ221V R330,31 ERJ3GEYJ103V D0GB103JA002 H0J800400015 OSCILATOR X101 H0J240500016 24MHZ OSCILATOR X201 H0J250500016 25MHZ OSCILATOR...
  • Page 36 Ref. No. Part No. Part Name & Description Remarks ECQB1H223JF3 0.022U ECQG1H102KZT 0.001 F0A1H102A025 ECQB1H682JF3 50V 0.0068U ECQG1H102KZT 0.001 F0A1H102A025 ECQB1H682JF3 50V 0.0068U ECQB1H333JF3 0.033U ECQB1H223JF3 0.022U C25,26 ECCR1H100D5 50V 10P ECA1VM472E 35V 4700 ECA1VM332 35V 3300U C36,37 ECRR1H104ZF1 0.1U F1E1H1040023 ECEA1CKS101 16V 100...
  • Page 37 Ref. No. Part No. Part Name & Description Remarks 2SD0592ARA TRANSISTOR 2SB621A-R TRANSISTOR 2SB0621AH Q5,Q6 2SA1015TPE2 TRANSISTOR B1ACCF000016 2SC1815TPE2 TRANSISTOR B1AACF000023 Q11,12 2SC1815TPE2 TRANSISTOR B1AACF000023 2SA1015TPE2 TRANSISTOR B1ACCF000016 2SC1815TPE2 TRANSISTOR B1AACF000023 2SA1015TPE2 TRANSISTOR B1ACCF000016 B1BAEJ000008 TRANSISTOR B1BCEJ000004 TRANSISTOR 2SC1815TPE2 TRANSISTOR B1AACF000023 2SA1015TPE2 TRANSISTOR...
  • Page 38 Ref. No. Part No. Part Name & Description Remarks R78,79 ERDS2T0 ERDS2FJ103 ERDS2FJ104 100K ERDS2FJ103 ERDS2FJ473 ERDS2FJ332 3.3K ERDS2FJ684 680K ERDS2FJ103 ERDS2FJ102 R91,92 ERDS2FJ222 2.2K ER0S2TKF1691 1.69K R94,95 ER0S2CKF1001 EROS2CKF1001 R96,97 ERD2FCG101 100 FUSE TYPE R98,99 ERDS2FJ331 R100 ERDS2FJ4R7 R101 ERDS2FJ684 680K R104...
  • Page 39 Ref. No. Part No. Part Name & Description Remarks D130 B3ABA0000360 D131 B3AAA0000471 D132,33 B3ABA0000360 D135 B3ABA0000360 D136 B3AAA0000471 D137 B3ABA0000360 D140,41 B3AAA0000471 D142-44 B3ABA0000360 D149-54 B3AAA0000471 D155 B3ABA0000360 ESW1 QSRGT002AA ENCODER SWITCH K9AA015B0034 M37471M2196S C2BBDB000023 HD74LS07P C0JACB000006 Q1-Q6 2SA830STPB TRANSISTOR Q7,Q8 2SB621A-R...
  • Page 40 Ref. No. Part No. Part Name & Description Remarks D1-D5 MA165TA5 DIODE MA2C16500E D9-15 MA165TA5 DIODE MA2C16500E D17-54 MA165TA5 DIODE MA2C16500E D57-72 MA165TA5 DIODE MA2C16500E D100-02 B3AAA0000471 D103-06 B3ABA0000360 D107 B3AAA0000471 D110-13 B3AAA0000471 D114 B3ABA0000360 D116,17 B3AAA0000471 D120-26 B3AAA0000471 D127 B3ABA0000360 D130-37 B3AAA0000471...
  • Page 41 Ref. No. Part No. Part Name & Description Remarks C0JAAN000078 <MKB2 P.C.B.> PCB6 SXPG231111B MKB2 P.C.B. [RTL] ECRR1H104ZF1 0.1U F1E1H1040023 ECRR1H104ZF1 0.1U F1E1H1040023 QJTG01812AA CONNECTOR(12P) QEUGQ8H08BCZ WIRE D89-76 MA165TA5 DIODE MA2C16500E IC2,C3 C0JAAN000078 <PKB P.C.B.> PCB7 SXPG218221 PKB P.C.B. [RTL] ECRR1H104ZF 50V 0.1U QJTG016050AA...
  • Page 42 Ref. No. Part No. Part Name & Description Remarks XBA1C40NB100 FUSE,4A 125V SVIGTLP513 PHOTO COUPLER VJJ0544 PEDAL IN K1CB104B0017 JK3,K4 K1CB103B0008 MIDI SJSD16-1 AC IN K2AB2K000003 K2HB102J0037 LINE OUT L K2HB102J0037 LINE OUT R/R+L K2HB102J0037 AUX L JK10 K2HB102J0037 AUX R/R+L L2,L3 QLQGT3T131TA COIL...
  • Page 43 Ref. No. Part No. Part Name & Description Remarks F1E1H104A001 0.1U ECEA1HSN010 50V 1U ECEA0JKS470 6V 47U ECBT1C682MR5 0.0068U F1D1C682A002 F1E1H104A001 0.1U ECEA1HSN010 50V 1U F1E1H104A001 0.1U F1D1H471A012 470P QJUG00703AA CONNECTOR(3P) SJPG2JS060A CONNECTOR(6P) SJPG2JS050A CONNECTOR(5P) MA165TA5 DIODE MA2C16500E SEL4214RLC05 C0AABB000054 JK1,K2 QJJG010AA JACK(HEADPHONE)
  • Page 44 CN606 QJUG00210AA CONNECTOR(10P) Ref. No. Part No. Part Name & Description Remarks D601 MA2062LF DIODE MAZ2062000LF D602 MA2051LF DIODE MAZ2051000LF FP601 K5G102AA0003 FUSE IC601 C0AABB000054 R601,02 ERDS2FJ153 R603 ERDS2TJ392 3.9K R604 ERDS2FJ332 3.3K R605 ERDS2TJ392 3.9K R606 ERDS2FJ332 3.3K R607 ERDS2FJ563 R608,09 ERDS2FJ223...
  • Page 48 18. Packaging...
  • Page 49 19. Schematic Diagram for printing with A4 / Printed in Japan / S030900000 HM/AM...
  • Page 50 Digital Ensemble [ SX-PR950 ] Function Transmitted Recognized Remarks Default 1 - 1 6 1 - 1 6 Assigned to the part. Basic Channel Changed 1 - 1 6 1 - 1 6 Default OMNI OFF , POLY MODE M o d e 3 Messages M=1 only Mode...
  • Page 51 LCD BACKLIGHT SWITCHES & LEDS SWITCHES & LEDS Q1-6 Q1-6 Q7,Q8 Q7-Q9 FLOPPY +5IP DISK POWER BUFFER BUFFER +5IP DRIVE DRIVER DRIVER TRANSFORMER ESW1 RHYTHM ENCODER VOLUME SWITCH SEG0-SEG7 CM0-CM5 SW0-SW7 SEG0-SEG8 CM0-CM5 SW0-SW7 ROTA 8BIT MICROCOMPUTER 8BIT MICROCOMPUTER DATA,SCK DATA,SCK ROTB MIAM...
  • Page 52 MKB1 MKB2 DECODER RELAY SWITCHES FP601 CN603 & DIODES DECODER DECODER CN606 SWITCHES & DIODES CN302 CN201 CN601 Q283 +VCC REGULATOR +VOP Q289 D284 REGULATOR -VOP D285 IC601A Q282 +3.3D IC601B +3.3D REGULATOR IC206 +3.3D Q206 D206 MEMORY +3.3B BACK UP D209 D207 CN604...
  • Page 53 JACK (2/2) D4,6 +15V POWER REGULATOR TRANSFORMER POWER SWITCH D7,9 -15V AC CORD REGULATOR +15HM +VCC -VCC +15M SPTR 6.5cm; 8 -15M SPTL 6.5cm; 8 IC10 CN10 Q14-Q17 IC7,8 14cm; 6 IC5,6 Q18-Q21 14cm; 6 EQUALIZING POWER AMPLIFIER HP/MIC POWER INDICATOR IC9B Q1,2...
  • Page 54 MAIN P.C.B. (A SIDE) C233 C242 C260 R234 D201 Q202 D209 Z301 C215 D207 C220 R214 R220 C303 Z205 R275 R217 C257 R276 R328 R269 R311 C251 R267 R232 R231 R230 R313 C256 R257 Q207 R314 C245 C246 IC205 D210 R315 C254 JP102...
  • Page 55 MAIN P.C.B. (B SIDE) CN302 CN201 TG CLOCK C310 C213 Z304 Z305 C210 Z303 R251 Z302 R225 C238 X301 C306 C239 R302 R307 C307 R303 R301 C305 R308 C214 R312 R227 Z310 L201 C250 C247 C217 R222 R254 R318 C248 L202 R319 C223...
  • Page 56 CPL P.C.B. J123 J124 J28J27 D114 APC/ TEMPO/ SEQUENCER AUTO PLAY CHORD VOLUME R30 R31 R29 PROGRAM ONE TOUCH SOUND FUNK& PLAY D130 MODE OFF/ON FADE IN FADE OUT ARRANGER MAIN SOUL POP BALLAD D100 J115 VOLUME J106 SPLIT D136 D137 D135 D110...
  • Page 57 MKB1 P.C.B. D72 D70 D25 J6 SW24 SW21 SW19 SW18 SW16 SW15 SW14 SW13 SW12 SW11 SW44 SW43 SW42 SW41 SW40 SW39 SW38 SW37 SW36 SW35 SW34 SW33 SW32 SW31 SW30 SW29 SW28 SW27 SW26 SW25 SW23 SW22 SW20 SW17 SW10 (SXPG231111A) MKB2 P.C.B.
  • Page 58 AS P.C.B. JACK P.C.B. R201 AMPL PMUT AMPL R202 R54 R55 AUX IN LINE OUT PEDAL IN MIDI IN MIDI OUT AUX IN L R/MONO LINE OUT L R/MONO AC IN J24 J23J22 J18 L6 JK10 (SXPG239931C) R118 J163 R114 R116 R112 J100...
  • Page 59 SCHEMATIC DIAGRAM-1 MAIN 1/4 CIRCUIT IORST A(0-25) D(0-31) +3.3D SELF LED FDC.TC 4.7K 2SB0709ARL PMUT 4.7K 100P 100K 2SD0601AQL MIDI.TX 0.22 MIDI.RX CP GATE CP.CLK 4.7K CP.DATA JIGU.CS MA2J11100L MA2J11100L EEP.SDA A(0) A(1) +3.3D +3.3D A(2) Z8 4.7Kx4 Z15 4.7Kx4 A(3) A(0) A(16)
  • Page 60 +3.3D +3.3D +3.3D +3.3D Z14 4.7Kx4 Z20 4.7Kx4 C28 0.1 D(0) D(16) D(1) D(17) D(2) D(18) D(3) D(19) Z16 4.7Kx4 Z21 4.7Kx4 D(4) D(20) D(5) D(21) D(6) D(22) D(7) D(23) C0JBAA000255 T74VHC08FTL Z18 4.7Kx4 Z22 4.7Kx4 D(8) D(24) +3.3D D(9) D(25) D(10) D(26)
  • Page 61 SCHEMATIC DIAGRAM-2 +3.3D +3.3D C29 0.1 C31 0.1 VCC VCC BYTE LCAS RESET BCAS RY/BY A(22) A(21) A(20) A(19) D(31) A(18) D(31) D(30) A(17) D(30) D(29) A(16) D(29) D(28) A(15) D(28) A(13) D(27) A(14) D(27) A(12) D(26) A(13) D(26) A(11) D(25) A(12) D(25)
  • Page 62 PORT.EX2 +3.3D C32 0.1 BYTE D(21) D(20) RESET RY/BY A(22) D(19) DSP.INT3 A(21) D(18) DSP.CS A(20) D(17) DSP.RST A(19) D(16) DSP.INT A(18) RESET A(17) D(31) CLOCK A(16) D(30) A(15) D(29) IC18 A(14) D(28) TC7W32FUTL A(13) D(27) IC21 A(12) D(26) C0JBAF000232 A(11) D(25) +3.3D...
  • Page 63 SCHEMATIC DIAGRAM-3 MAIN 2/4 CIRCUIT CN107 +3.3D R104 +3.3D CN101 C101 Z103 1Kx4 C115 24 23 22 21 20 19 18 17 16 15 14 13 R101 R102 SIDE R103 Z107 100x4 WPRT MEDIA IO0 D(23) TRKO MEDIA IO1 D(22) VDATA D(21) VGATE...
  • Page 64 JACK CIRCUIT CPL, CPR CIRCUIT (CN2) ON SCHEMATIC (CN1) ON SCHEMATIC DIAGRAM-14 DIAGRAM-8, 9 CN107 CN105 FDC DRQ FDC TC IC105 FDC INT C0JBAZ001264 FDC DACK C129 DUAL 3 STATE +3.3D FDC CS C124 BUFFER R122 R123 R126 R127 R120 4.7K 4.7K 4.7K...
  • Page 65 SCHEMATIC DIAGRAM-4 MAIN 3/4 CIRCUIT DSP.CS DSP.RST CKOUT C208 0.001 MIC.SNS IORST C207 LRCKR SDDR1 BCKR 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 DAC.ML DAC.MC DAC.MD EA(6) SDD1 EA6/ED18 EA(7)
  • Page 66 Z205 D218 D219 4.7Kx4 MA2J11100L MA2J11100L +20V -VOP2 C251 Q203 D214 C247 2SB970-Q MAZ82000HL 63V47 R221 G1C101K00032 Q205 R224 L202 2SD0601AQL 2.2K D204 R254 Q209 MA2QD0100L 1W0.33 Q201 C216 2SB14400RL 2SD0601AQL 6V47 D210 R243 R216 R255 R256 D205 MA2QD0100L Q212 MA2QD0100L 2SB0709ARL C223...
  • Page 67 SCHEMATIC DIAGRAM-5 C233 R234 R247 100K C243 C229 C226 16V10 C234 R238 50V1 C232 6V100 IC209 28 27 26 25 24 23 22 21 20 19 18 17 16 15 M5218AFPE3 IC207 PCM1716ET2 R248 C0FBBK000009 100K (DAC) C244 R239 C235 50V1 Z204 C227...
  • Page 69 SCHEMATIC DIAGRAM-6 MAIN 4/4 CIRCUIT SDIE(0-2) SDOE(0-1) C311 100P KB(0) KB(1) C312 100P +3.3D KB(2) C313 100P KB(3) C314 100P +3.3D KB(4) C315 100P C310 CN302 +3.3D D301-D304 MA2J11100L Z307 4.7Kx4 D301 KF(2) D302 KS(2) KF(3) D303 D304 KS(3) Z308 4.7Kx4 +3.3D KF(0) D305...
  • Page 70 +3.3D C322 R321 R330 BYTE RESET RY/BY IC301 WP/ACC AWAY(21) C1BB00000709 AWAY(20) MASTER TONE AWAY(19) GENERATOR LSI AWAY(18) AWAY(17) +3.3D AWAY(16) AWAY(15) AWD(15) AWAY(14) AWD(14) AWAY(13) AWD(13) AWAY(12) AWD(12) AWAY(11) AWD(11) WCEV1 AWAY(10) AWD(10) R324 WCEV0 AWAY(9) AWD(9) R325 AWAY(0) AWAY(8) AWD(8) R326...
  • Page 71 SCHEMATIC DIAGRAM-7 AS CIRCUIT POWER M5F78M15L +VCC TRANSFORMER (+15 VOLTAGE REGULATOR) 220V BLUE 240V MA4180TA BLACK SVDS3V40 SVDS3V40 35V4700 16V100 120V BLUE 35V3300 16V330 SVDS3V40 ERA1502V5 ERA1502V5 R118 MA4180TA SVDS3V40 -VCC M5F79M15L (-15 VOLTAGE REGULATOR) +VCC +VCC 100K PMUT 1/4W2 2SA1015TPE2 PMUT 1/4W2...
  • Page 72 +15M 1/4W22 330K 2SA1015TPE2 4.7K 330K 2SD0592ARA R201 1/4W4.7 +15HM 2SA1015TPE2 2SA1015TPE2 2SB621A-R +VCC +15HM 4.7K 2.2K EK04W -VCC 2SC1815TPE2 C0AABB000054 (EQUALIZING) 3.3K -15M 2SD0592ARA R202 2SC1815TPE2 1/4W4.7 2SB621A-R 2SC1815TPE2 330K 2.2K 1/4W22 MA165TA5 330K R104 R101 680K 0.47 +VCC +15M R114 1/4W100...
  • Page 73 SCHEMATIC DIAGRAM-8 CPL CIRCUIT +5IP M37471M2196S (8BIT MICROCOMPUTER) PANEL L PANEL L +5IP PANEL L PANEL L EF0MC4004T5 PANEL L XOUT HELP 0.022 OTHER PARTS/ TRACKS +5IP VREF 2SA830STPB 6V100 D100 B3AAA0000471 METRONOME 2SA830STPB +5IP D110 +5IP B3AAA0000471 DATA SOUT FADE IN 2SA830STPB D120...
  • Page 74 SW41 SW25 SW33 SYNCHRO VARIATION1 METRONOME FADE IN BREAK SW10 SW18 SW26 SW34 SW42 VARIATION2 START/STOP 8 BEAT FADE OUT SW11 SW19 SW35 SW43 SW27 SOUND 16 BEAT ROCK ARRANGER VARIATION3 TEMPO SW12 SW20 SW28 SW44 FUNK& TRANSPOSE- VARIATION4 SOUL SW21 SW13 SW29...
  • Page 75 SCHEMATIC DIAGRAM-9 SW49 DEMO SW50 MUSIC STYLE ARRANGER SW51 PROGRESSIVE PIANIST SW52 PIANO STYLIST SW53 SPLIT POINT SW54 APC MODE SW55 APC ON/OFF SW56 ONE TOUCH PLAY D106 D107 B3AAA0000471 B3AAA0000471 BALLAD BALLROOM& SHOW D116 B3AAA0000471 SPLIT POINT C2 D126 D127 B3AAA0000471 B3AAA0000471...
  • Page 76 CPR CIRCUIT +5IP M37471M2196S (8BIT MICROCOMPUTER) PLAY EASY REC +5IP FAVORITES PROGRAM MENUS EFOEC4004T3 DISC XOUT +5MI 0.022 +5IP VREF 2SA830STPB D100 B3AAA0000471 TECHNI- CHORD 2SA830STPB +5IP D110 +5IP B3AAA0000471 GRAND DATA SOUT PIANO 2SA830STPB D120 B3AAA0000471 +5MI CPRST BASS CNTR1 6V47 2SA830STPB...
  • Page 77 SCHEMATIC DIAGRAM-10 SW17 SW33 SW41 SW25 LEFT TECHNI- STARTING BASS SELECT CHORD GRAND PIANO SW26 SW34 SW18 SW10 SW42 UPRIGHT MALLET& BANK RIGHT 2 VOCAL PIANO ORCH PERC SW27 SW35 SW11 SW19 SW43 ELECTRIC WORLD RIGHT 1 PIANO GUITAR&HARPSI SW12 SW20 SW28 SW36...
  • Page 78 SW57 SW65 SW49 MUTE MUTE PANEL R DOWN 3 DOWN 1 SW58 SW66 SW50 MUTE MUTE PANEL R UP 3 UP 1 SW59 SW67 SW51 MUTE MUTE PANEL R DOWN 2 DOWN 4 SW60 SW68 SW52 MUTE MUTE PANEL R UP 4 UP 2 SW61...
  • Page 79 SCHEMATIC DIAGRAM-11 MKB1 CIRCUIT C0JAAN000070 +VCC (3 TO 8 DECODER) 6.3V47 UNLESS OTHERWISE SPECIFIED: DIODES ARE MA165TA5.
  • Page 80 SX-PR950 MKB1 (1/2) SCHEMATIC DIAGRAM...
  • Page 81 SCHEMATIC DIAGRAM-12 MKB2 CIRCUIT UNLESS OTHERWISE SPECIFIED: DIODES ARE MA165TA5.
  • Page 82 C0JAAN000070 (3 TO 8 DECODER) +VCC SX-PR950 MKB1 (2/2), MKB2 (1/2) SCHEMATIC DIAGRAM...
  • Page 83 SCHEMATIC DIAGRAM-13 C0JAAN000070 (3 TO 8 DECODER) +VCC...
  • Page 84 SX-PR950 MKB2 (2/2) SCHEMATIC DIAGRAM...
  • Page 85 SCHEMATIC DIAGRAM-14 JACK CIRCUIT QLQGT3T131TA 4.7K SOSU 4.7K SUST 4.7K SOFT PEDAL IN MRXD QLQGT3T131TA MTXD 0.1P QLQGT3T131TA MIDI OUT MA165TA5 220P MA165TA5 SVIGTLP513 QLQGT3T131TA MIDI IN 0.1P MA165TA5 0.047P 0.1P 0.1P 2200P LINE OUT L QLQGT3T131TA AUXL 0.1P AUXR 2200P LINE OUT R/R+L 2200P...
  • Page 86 PKB CIRCUIT PEDAL CORD CN1 +5 PEDAL QSTGT001AA QSTGT001AA QSTGT001AA 4.7K 4.7K 4.7K HP/MIC CIRCUIT C5 47P R10 68K R8 100K QLQGT3T131TA C0AABB000054 2.2K 4.7K 50 1 470P 50 1 100K C0AABB000054 C0AABB000054 MICROPHONE 50 1 R12 3.3K MA165TA5 B1AACF000068 6V47 QRVG09A02B54 MSNS...
  • Page 87 SCHEMATIC DIAGRAM-15 RELAY CIRCUIT +3.3D 3.3GC CN601 D601 D602 C607 MA2062LF MA2051LF 5V1F -VOP2 +3.3D 3.3GC CN603 FP601 K5G102AA0003 C613 35V47 C612 0.047 R611 PMUT MSNS CN604 +VOP +VOP MSNS -VOP -VOP -VOP -15A +VOP +15A AMPL AMPR CN605 C601 50 1 AUXR C602...
  • Page 89 SCHEMATIC DIAGRAM-1 MAIN 1/4 CIRCUIT IORST A(0-25) D(0-31) +3.3D +3.3D +3.3D +3.3D +3.3D Z14 4.7Kx4 Z20 4.7Kx4 C28 0.1 SELF LED D(0) D(16) FDC.TC 4.7K D(1) D(17) 2SB0709ARL PMUT D(2) D(18) 4.7K D(3) D(19) 100P 100K Z16 4.7Kx4 Z21 4.7Kx4 D(4) D(20) D(5)
  • Page 90 SCHEMATIC DIAGRAM-2 PORT.EX2 +3.3D +3.3D +3.3D C29 0.1 C31 0.1 C32 0.1 VCC VCC BYTE BYTE D(21) D(20) LCAS RESET RESET RY/BY A(22) D(19) BCAS RY/BY DSP.INT3 A(22) A(21) D(18) DSP.CS A(20) A(21) D(17) DSP.RST A(20) A(19) D(16) DSP.INT A(19) A(18) RESET A(17)
  • Page 91 JACK CIRCUIT CPL, CPR CIRCUIT SCHEMATIC DIAGRAM-3 (CN2) ON SCHEMATIC (CN1) ON SCHEMATIC DIAGRAM-14 DIAGRAM-8, 9 MAIN 2/4 CIRCUIT CN107 CN105 +3.3D R104 FDC DRQ FDC TC IC105 FDC INT C0JBAZ001264 FDC DACK C129 +3.3D DUAL 3 STATE +3.3D CN101 C101 Z103 1Kx4 C124...
  • Page 92 SCHEMATIC DIAGRAM-4 MAIN 3/4 CIRCUIT DSP.CS Z205 D218 D219 DSP.RST 4.7Kx4 MA2J11100L MA2J11100L +20V -VOP2 CKOUT C208 C251 Q203 0.001 D214 C247 MIC.SNS 2SB970-Q MAZ82000HL 63V47 IORST C207 LRCKR SDDR1 R221 BCKR 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 DAC.ML G1C101K00032 Q205...
  • Page 93 SCHEMATIC DIAGRAM-5 R234 C233 R247 100K C243 C229 C226 16V10 C234 R238 50V1 C232 6V100 IC209 28 27 26 25 24 23 22 21 20 19 18 17 16 15 M5218AFPE3 IC207 PCM1716ET2 R248 C0FBBK000009 100K (DAC) C244 R239 C235 50V1 Z204 C225...
  • Page 94 SCHEMATIC DIAGRAM-6 MAIN 4/4 CIRCUIT SDIE(0-2) SDOE(0-1) C311 100P KB(0) KB(1) C312 100P +3.3D KB(2) C313 100P KB(3) C314 100P +3.3D KB(4) C315 100P +3.3D C310 CN302 C322 R321 +3.3D R330 BYTE RESET RY/BY D301-D304 IC301 WP/ACC MA2J11100L AWAY(21) C1BB00000709 Z307 4.7Kx4 AWAY(20) D301...
  • Page 95 SCHEMATIC DIAGRAM-7 AS CIRCUIT POWER M5F78M15L +15M TRANSFORMER +VCC (+15 VOLTAGE REGULATOR) 220V BLUE 1/4W22 330K 240V 2SA1015TPE2 4.7K MA4180TA BLACK SVDS3V40 330K SVDS3V40 35V4700 16V100 2SD0592ARA 120V R201 1/4W4.7 +15HM 2SA1015TPE2 BLUE 2SA1015TPE2 2SB621A-R 35V3300 16V330 SVDS3V40 +VCC +15HM 4.7K 2.2K ERA1502V5...
  • Page 96 SCHEMATIC DIAGRAM-8 CPL CIRCUIT +5IP M37471M2196S (8BIT MICROCOMPUTER) SW25 SW33 SW41 PANEL L SYNCHRO METRONOME FADE IN VARIATION1 BREAK SW10 SW18 SW26 SW34 SW42 PANEL L START/STOP 8 BEAT FADE OUT VARIATION2 SW11 SW19 SW35 +5IP SW43 SW27 16 BEAT SOUND PANEL L VARIATION3...
  • Page 97 SCHEMATIC DIAGRAM-9 CPR CIRCUIT +5IP M37471M2196S (8BIT MICROCOMPUTER) PLAY SW49 DEMO SW50 MUSIC STYLE EASY REC ARRANGER +5IP SW51 FAVORITES PROGRESSIVE PIANIST SW52 PROGRAM PIANO STYLIST MENUS SW53 EFOEC4004T3 SPLIT DISC POINT SW54 APC MODE XOUT SW55 APC ON/OFF +5MI 0.022 SW56 ONE TOUCH PLAY...
  • Page 98 SCHEMATIC DIAGRAM-10 SW17 SW33 SW41 SW57 SW65 SW25 SW49 LEFT TECHNI- STARTING MUTE BASS MUTE GRAND PIANO PANEL R SELECT CHORD DOWN 3 DOWN 1 SW26 SW34 SW58 SW66 SW50 SW18 SW10 SW42 UPRIGHT MALLET& MUTE MUTE PANEL R RIGHT 2 BANK PIANO ORCH PERC...
  • Page 99 SCHEMATIC DIAGRAM-11 MKB1 CIRCUIT C0JAAN000070 +VCC (3 TO 8 DECODER) 6.3V47 UNLESS OTHERWISE SPECIFIED: DIODES ARE MA165TA5. SX-PR950 MKB1 (1/2) SCHEMATIC DIAGRAM...
  • Page 100 SCHEMATIC DIAGRAM-12 MKB2 CIRCUIT C0JAAN000070 (3 TO 8 DECODER) +VCC UNLESS OTHERWISE SPECIFIED: DIODES ARE MA165TA5. SX-PR950 MKB1 (2/2), MKB2 (1/2) SCHEMATIC DIAGRAM...
  • Page 101 SCHEMATIC DIAGRAM-13 C0JAAN000070 (3 TO 8 DECODER) +VCC SX-PR950 MKB2 (2/2) SCHEMATIC DIAGRAM...
  • Page 102 SCHEMATIC DIAGRAM-14 PKB CIRCUIT JACK CIRCUIT PEDAL CORD CN1 +5 QLQGT3T131TA 4.7K SOSU 4.7K PEDAL SUST 4.7K SOFT PEDAL IN MRXD QLQGT3T131TA MTXD QSTGT001AA QSTGT001AA QSTGT001AA 4.7K 4.7K 4.7K 0.1P QLQGT3T131TA MIDI OUT MA165TA5 220P MA165TA5 HP/MIC CIRCUIT SVIGTLP513 QLQGT3T131TA MIDI IN 0.1P MA165TA5...
  • Page 103 SCHEMATIC DIAGRAM-15 RELAY CIRCUIT +3.3D 3.3GC CN601 D601 D602 C607 MA2062LF MA2051LF 5V1F -VOP2 +3.3D 3.3GC CN603 FP601 K5G102AA0003 C613 35V47 C612 0.047 R611 PMUT MSNS CN604 +VOP +VOP MSNS -VOP -VOP -VOP -15A +VOP +15A AMPL AMPR CN605 C601 50 1 AUXR C602...
  • Page 104 PKB P.C.B. JACK P.C.B. K1EA04DD0002 QEXGZA34086C CORE CORE QEXGSS14040A QEXGSS08040A MAIN P.C.B. RELAY P.C.B. AS P.C.B. AC CORD CN603 AC IN CN101 POWER CN107 CN605 CORE TRANSFORMER CN606 CN201 CN601 QEXGVH03120B POWER SWITCH CORE CN302 QEXGVH04170B QEUGMWW10C QEXGSS16105A 6.5cmSPR 6.5cmSPL CN105 CN103 CN604...
  • Page 105 PIANO STYLIST AUTO PLAY CHORD RHYTHM GROUP You can choose to have Add an automatic Various rhythm patterns are all the settings of this available for each rhythm accompaniment to your instrument automatically group. selected rhythm. set. FADE AUTO PLAY CHORD RHYTHM GROUP TEMPO / PROGRAM APC/SEQUENCER...
  • Page 106 FAVORITES Fashion a customized display in which all your favorite sounds, rhythms and styles etc. are assembled. DISPLAY Displays performance information, SOUND GROUP SEQUENCER function settings and other messages. Various sounds are Record and play available for each back your Use the CONTRAST buttons to sound group.
  • Page 107 This instrument has many settable functions and storable memories. However, you can return the settings and memory to the factory-preset status. Press the PROGRAM MENUS button to turn it Use the buttons to select the desired type of initialization. • PERFORMANCE includes all the items which are listed PROGRAM below it.
  • Page 108 (on the rear panel) MIDI PEDAL IN LINE OUT AUX IN AUX IN Other instruments such as a sound generator can be connected to this terminal, and the sound will be output from this instrument’s speakers. To receive monaural sound, connect the other instrument to the R/MONO terminal.
  • Page 109 Phenomenon Remedy The buttons, keys, etc. malfunction. • Turn off the POWER button once, then turn it on again. If this procedure is not successful, turn off the POWER button once. Then, while pressing the three lower left buttons in the RHYTHM GROUP section (8BEAT, 16BEAT and USA) at the same time, turn the POWER button on again.
  • Page 110 Phenomenon Remedy Storage is not possible. • The remaining memory capacity of the COMPOSER is Setting the time signature is not possible. The time signature cannot be changed for a pattern • which is currently recorded in the COMPOSER. If you wish to change the time signature, first follow the pro- cedure to clear the memory.
  • Page 111 Contents Contents The data on the disk that you are It is only possible to copy melody using is for a different product. tracks. Tracks such as rhythm, chord and An error has occurred while the disk control cannot be copied. was loading.
  • Page 112 Contents AUTO PUNCH recording has been unsuccessful because SEQUENCER operation was interrupted before the PUNCH OUT measure was reached. The song that you have tried to load exceeds this instrument’s available memory and cannot be loaded. The selected song memory has been cleared.
  • Page 113 How to open the top cover Care and maintenance You can open the cover and lift the support into an upright Care of the finished surfaces position. To dust the piano, use a feather duster or wipe gently with a soft cloth. Top cover To avoid scratching the surface, refrain from applying too much pressure when dusting the piano.
  • Page 114 Follow the steps below to assemble your Technics piano. Make sure you are using the correct parts and that they are in the correct direction. At least 2 people are required for assembly. To disassemble the piano, reverse the procedure.