Page 1: Service Manual
CIRCUIT BOARDS ............39 PSR-S750 TEST PROGRAM ........56 PSR-S950 TEST PROGRAM ........63 PSR-S750 SYSTEM BOOTING FLOWCHART ..71 PSR-S950 SYSTEM BOOTING FLOWCHART ..73 PSR-S750 DM CIRCUIT BOARD CHECK METHOD ..75 PSR-S950 DM CIRCUIT BOARD CHECK METHOD ..76 DATA BACKUP .............77 SYSTEM RESET............78 PARTS LIST...
Page 2: Saving Data
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
PSR-S750/PSR-S950 SPECIFICATIONS PSR-S950 PSR-S750 Width x Height x Depth (without Music Rest) 1,002 x 148 x 437 mm (39 7/16” x 5 13/16” x 17 3/16”) Size and Weight Weight (without Music Rest) 11.5 kg (25 lbs., 6 oz.) 11 kg (24 lbs., 4 oz.)
Page 4 You will need the PRODUCT ID on the sheet in order to fill out the User Registration form. Included Accessories • Music Rest • AC Power Adaptor (PA-300C or an equivalent recommended by Yamaha) This may not be included depending on your particular area. Please check with your Yamaha dealer. AC Power Adaptor...
Page 5: Panel Layout
PSR-S750/PSR-S950 PANEL LAYOUT • Rear Panel PSR-S950 only PSR-S950 only ■ Rear Panel q DC IN jack w [FOOT PEDAL] jacks e OUTPUT [L/L+R]/[R] jacks r [AUX IN] jack t [MIC/LINE IN] jack (PSR-S950) y [INPUT VOLUME] knob (PSR-S950) u [MIC LINE] switch (PSR-S950)
Page 6 [MASTER VOLUME] dial !3 [MODULATION] wheel e [DEMO] button !4 [PHONES] jack r [MIC SETTING/VOCAL HARMONY] button !5 [LCD CONTRAST] knob (PSR-S750) !6 LCD and related controls (PSR-S950) t SONG buttons !7 [BALANCE] button y STYLE category selection buttons...
Page 7 PSR-S750/PSR-S950 A’ @4 VOICE CONTROL buttons @5 [MUSIC FINDER] button @6 PART SELECT buttons @7 PART ON/OFF buttons @8 REGISTRATION MEMORY buttons @9 MULTI PAD CONTROL buttons #0 ONE TOUCH SETTING buttons #1 UPPER OCTAVE buttons...
Page 8: Circuit Board Layout & Wiring
PSR-S750/PSR-S950 CIRCUIT BOARD LAYOUT & WIRING SPEAKER (TWEETER) SPEAKER (WOOFER) LOWER CASE ASSEMBLY SPEAKER (WOOFER) SPEAKER (TWEETER) AJACK UPPER CASE ASSEMBLY SHIELD COVER AJACK...
Page 9 PSR-S750/PSR-S950 SPEAKER (TWEETER) SPEAKER (WOOFER) LOWER CASE ASSEMBLY SPEAKER (WOOFER) SPEAKER (TWEETER) AJACK UPPER CASE ASSEMBLY SHIELD COVER AJACK...
Page 10 PSR-S750/PSR-S950 AJACK MK-H MK-L EMKS61A * This figure shows the PSR-S950. KEYBOARD ASSEMBLY LCD ASSEMBLY LCD ASSEMBLY * This figure shows the PSR-S750. * This figure shows the PSR-S950.
Page 11 PSR-S750/PSR-S950 ● PSR-S750 Unit Name Location Parts No. Parts Name Connection Remarks (ZA57660) Connector Assembly XH_S DM CN500 - AJACK CN4 (ZA57730) Connector Assembly PH-ZH_S AJACK CN9 - PNM CN2 (ZA57680) Connector Assembly PH-ZH_S DM CN502 - AJACK CN2 (ZA57690)
Page 12: Disassembly Procedure
PSR-S750/PSR-S950 DISASSEMBLY PROCEDURE Precautions * Disassembly or assembly should be performed on a cloth so as not to damage the LCD. * Install the ﬁ lament tape and the harness clamp in the same way as they were before removal.
Page 13 <Rear view> [440D] [440B] PSR-S950 only AJACK <Bottom view> [440C] * This figure shows the PSR-S950. [430B] [430B] [430B] [500A] [430A] [500B] AJACK UPPER CASE ASSEMBLY [430B] [430B] [430B] [440A] [440A] Fig. 3 *1: This figure shows the PSR-S750.
Page 14 Remove the lower case assembly. (See procedure 2.) 8-1. Remove the lower case assembly. (See procedure 2.) 6-2. PSR-S750: Remove the eight (8) screws marked 8-2. Remove the screw marked [440E] and the eight (8) [440A]. The DM circuit board can then be removed.
Page 15 VOLUME KNOB ENCORDER KNOB [510B] * This figure shows the PSR-S950. CENTER PANEL ASSEMBLY Fig. 5 CENTER PANEL ASSEMBLY CLAWS UPPER CASE ASSEMBLY Fig. 6 ● CENTER PANEL ASSEMBLY (PSR-S750) FFC_S WIRING ASSEMBLY [300A] [300A] [300A] [300A] LCD ASSEMBLY Fig. 7...
Page 16 ● CENTER PANEL ASSEMBLY (PSR-S950) FFC_S WIRING ASSEMBLY [300B] [300C] [300C] [300B] LCD ASSEMBLY Fig. 8 Crystal Display (PSR-S750) (Time required: About 7 minutes) ● LCD ASSEMBLY (PSR-S750) 9-1. Remove the lower case assembly. (See procedure 2.) <Bottom view> 9-2.
Page 17 Fig. 11 ﬁ rst, tighten the screws z and x in that order and then tighten the other screws. that order and then tighten the other screws. PNM Circuit Board (PSR-S750) Keyboard Assembly (Time required: About 10 minutes) 12-1.
Page 18 PSR-S750/PSR-S950 PNL Circuit Board PNR Circuit Board (Time required: About 5 minutes) (Time required: About 5 minutes) 15-1. Remove the lower case assembly. (See procedure 2.) 17-1. Remove the lower case assembly. (See procedure 2.) 15-2. Remove the keyboard assembly. (See procedure 14.) 17-2.
Page 19 PSR-S750/PSR-S950 Tweeter Speaker Grille Assembly (Time required: About 4 minutes) (Time required: About 5 minutes) 18-1. Remove the lower case assembly. (See procedure 2.) 20-1. Remove the lower case assembly. (See procedure 2.) 18-2. Remove the two (2) screws marked [210]. The tweeter 20-2.
Page 20 PSR-S750/PSR-S950 21-6. Rubber Contact Disassembling the Keyboard Assembly 21-6-1. Remove the rubber contact. (Fig. 15) (Photo 2) 21-1. Remove the lower case assembly. (See procedure 2.) 21-2. Remove the keyboard assembly. (See procedure 14.) White and Black Keys 21-7. 21-8. Remove the twenty-one (21) screws marked [140K], EMKS61A Circuit Board 21-3.
Page 21 PSR-S750/PSR-S950 22-4. Install the rubber contacts while pulling the keys up. Assembling the Keyboard Assembly (Fig. 17, Fig. 18) 22-1. Install the white keys CEGB from the lower notes. When ﬁ tting the rubber contacts, raise both ends (Fig. 16) of the frame so that keys do not push the rubber 22-2.
Page 22: Table Of Contents
PSR-S750/PSR-S950 LSI PIN DESCRIPTION AK4396VF-E2 (X8324A00) DAC (Digital to Analog Converter) ............36 AK5357ET-E2 (X7585A00) ADC (Analog to Digital Converter) ............36 AK5381VT-E2 (X5219A0R) ADC (Analog to Digital Converter) ............36 BD6590MUV-E2 (YD867A00) DC-DC CONVERTER ................38 BH7236AF-E2 (XS062A00) RGB ENCODER ..................34 ISL85033IRTZ-T (YD766A00) DC-DC CONVERTER ................37 LT3506AEDHD#TRPBF (YC714A00) DC-DC CONVERTER ..............38...
Page 23: R8A77310D333Bg (Yc170A00) Sh7731
PSR-S750/PSR-S950 R8A77310D333BG (YC170A00) SH7731 DM: IC1 (SPR-S950) OUTER OUTER NAME FUNCTION NAME FUNCTION AV33 3.3V power supply for USB reference power supply circuit USB DP pin Ground DG12 1.2V power supply ground for USB driver/receiver XTAL Clock output DG33 3.3V power supply ground for USB driver/receiver...
Page 24 PSR-S750/PSR-S950 OUTER OUTER NAME FUNCTION NAME FUNCTION VCCQ I/O power supply (3.3V) Ground PTM7/LCDD7 Port/LCD data bus Ground PTM5/LCDD5 Port/LCD data bus Internal power supply (1.2V) PTM4/LCDD4 Port/LCD data bus Ground PTM3/LCDD3 Port/LCD data bus HPD56/PTN0 SDRAM upper data bus/port...
Page 25 PSR-S750/PSR-S950 OUTER OUTER NAME FUNCTION NAME FUNCTION HPDQM0 SDRAM interface lower LL side data mask Chip select HPDQM1 SDRAM interface lower LU side data mask Read signal HPDQM3 SDRAM interface lower UU side data mask WE3/ICIOWR D31 to D24 write/PCMCIA IO write...
Page 26: R8A02042Bg (Yc479A00) Swx08
PSR-S750/PSR-S950 DM: IC2 (SPR-S750)
Page 27 PSR-S750/PSR-S950...
Page 28: Μpd800500F1-011-Kn (Yc706A00) Ssp2
PSR-S750/PSR-S950 μPD800500F1-011-KN (YC706A00) SSP2 DM: IC607 (SPR-S950) PIN OUTER NAME FUNCTION PIN OUTER NAME FUNCTION SDO4 Output Buffer (3.3V) 3mA VDD33 Input Buffer (3.3V) Schmitt Oscillator with EN (3.3V) 12.288MHz VDD33 Oscillator with EN (3.3V) 12.288MHz WCLKO Output Buffer (3.3V) 6mA REFCLKO Output Buffer (3.3V) 3mA...
Page 29 PSR-S750/PSR-S950...
Page 30: T6Tj3Xbg-0001 (X8940A00) Swp51L (Tone Generator)
PSR-S750/PSR-S950 DM: IC6 (PSR-S750) T6TJ3XBG-0001 ( X8940A00 ) SWP51L ( Tone Generator ) DM: IC601 (PSR-S950) OUTER OUTER NAME FUNCTION NAME FUNCTION VDDC Power supply +1.5 V Ground VDDC HRD2 Ground HRD0 HRD9 CD14 DRAM data bus HRD11 CD13 Data bus of internal register...
Page 31 PSR-S750/PSR-S950 OUTER OUTER NAME FUNCTION NAME FUNCTION LMD11 VDDC LMD4 Wave memory data bus (Lower 16 bit) VDDC LMD3 AC10 VDDC Power supply +1.5 V Power supply +3.3 V AC11 VDDC VDDS AC12 VDDC AC13 VDDC AC14 VDDS Ground AC15...
Page 32: Μpd720150Gk-9Eu-A (Yd546A00) Usb Controller
PSR-S750/PSR-S950 μPD720150GK-9EU-A (YD546A00) USB CONTROLLER DM: IC406 (PSR-S950) NAME FUNCTION NAME FUNCTION Ground Oscillator in (Separate mode) Address bus Connect to 30 MHz crystal. (Separate mode) Address bus Oscillator out (Separate mode) Address bus Connect to 30 MHz crystal. (Separate mode) Address bus...
Page 33: S1D13700F01A100 (X5422A00) Lcd Controller
PSR-S750/PSR-S950 S1D13700F01A100 (X5422A00) LCD CONTROLLER DM: IC14 (PSR-S750) NAME FUNCTION NAME FUNCTION – Ground – Ground AB12 XCD1 Drain output AB11 XCG1 Gate input AB10 Adorress bus RESET# Reset SCANEN Test mode set up input TESTEN HIOVDD – Power supply...
Page 34: Bh7236Af-E2 (Xs062A00) Rgb Encoder
PSR-S750/PSR-S950 TMP89FW24AFG-7KH4 (YD841B00) E-PNS3a PNM: IC1 NAME FUNCTION NAME FUNCTION PORT96 PORT52 PORT97 PORT53 VDD pin PORT54 PORT00 PORT55 GND pin PORT56 PORT01 PORT57 Reset signal input PORT60 RESET PORT02 PORT61 PORT03 PORT62 MODE Test pin for out-going test (fix to Low level).
Page 35: Ygv628B-Vz (X6356B00) Rgb Controller
PSR-S750/PSR-S950 YGV628B-VZ (X6356B00) RGB CONTROLLER AVDP7 DM: IC407 (PSR-S950) NAME FUNCTION NAME FUNCTION SA13 Video memory address bus Digital power supply +3.3 V CPU address bus SA11 SA12 Digital power supply +3.3 V Video memory address bus CPU address bus...
Page 36: Ak4396Vf-E2 (X8324A00) Dac (Digital To Analog Converter)
PSR-S750/PSR-S950 AK5357ET-E2 (X7585A00) ADC (Analog to Digital Converter) DM: IC510 (PSR-S750) NAME FUNCTION NAME FUNCTION AINR Rch Analog input pin SDTO Audio serial data output pin AINL Lch Analog input pin LRCK Output channel clock pin CKS1 Mode select 1 pin...
Page 37: Isl85033Irtz-T (Yd766A00) Dc-Dc Converter
PSR-S750/PSR-S950 ISL85033IRTZ-T (YD766A00) DC-DC CONVERTER DM: IC902 (PSR-S950) NAME FUNCTION 1, 21 COMP1, COMP2 COMP1/COMP2 is the output of the error amplifier. 2, 20 FB1, FB2 Feedback pin for the regulator. FB is the negative input to the voltage loop error amplifier.
Page 38: Bd6590Muv-E2 (Yd867A00) Dc-Dc Converter
PSR-S750/PSR-S950 LT3506AEDHD#TRPBF (YC714A00) DC-DC CONVERTER DM: IC502 (PSR-S750) NAME FUNCTION 1, 8 BOOST1, BOOST2 The BOOST pins are used to provide drive voltages, higher than the input voltage, to the internal bipolar NPN power switches. Tie through a diode from V...
Page 39: Circuit Boards
PSR-S750/PSR-S950 CIRCUIT BOARDS AJACK Circuit Board (YD887D0) ............44/45 DM Circuit Board (YD855C0) (PSR-S750) .......... 40/41 DM Circuit Board (YD846C0) (PSR-S950) .......... 42/43 EMKS61A Circuit Board (X6637C0)............ 54/55 HP Circuit Board (YD887D0) ..............53 MK-H Circuit Board (XR565C0)..............55 MK-L Circuit Board (XR564C0) ..............54 MOD Circuit Board (YD887D0)..............
Page 40 PSR-S750/PSR-S950 DM Circuit Board (PSR-S750) Component side 2NA-WZ35370...
Page 41 PSR-S750/PSR-S950 DM Circuit Board (PSR-S750) Pattern side 2NA-WZ35370...
Page 42 PSR-S750/PSR-S950 Scale: 90/100 DM Circuit Board (PSR-S950) Component side 2NA-WZ49340...
Page 43 PSR-S750/PSR-S950 Scale: 90/100 DM Circuit Board (PSR-S950) Pattern side 2NA-WZ49340...
Page 44 PSR-S750/PSR-S950 Scale: 90/100 AJACK Circuit Board Component side 2NA-WZ43510...
Page 45 PSR-S750/PSR-S950 Scale: 90/100 AJACK Circuit Board Pattern side 2NA-WZ43510...
Page 46 PSR-S750/PSR-S950 Scale: 70/100 PNM Circuit Board Component side 2NA-WZ50830...
Page 47 PSR-S750/PSR-S950 Scale: 70/100 PNM Circuit Board Pattern side 2NA-WZ50830...
Page 48 PSR-S750/PSR-S950 PNS Circuit Board Component side 2NA-WZ50830...
Page 49 PSR-S750/PSR-S950 PNS Circuit Board Pattern side 2NA-WZ50830...
Page 50 PSR-S750/PSR-S950 Scale: 75/100 PNC Circuit Board Component side Pattern side 2NA-WZ55980...
Page 51 PSR-S750/PSR-S950 Scale: 75/100 PNL Circuit Board Component side Pattern side 2NA-WZ55980...
Page 52 PSR-S750/PSR-S950 Scale: 90/100 PNR Circuit Board Component side Pattern side 2NA-WZ55980...
Page 53 PSR-S750/PSR-S950 HP Circuit Board Component side Pattern side MOD Circuit Board Component side Pattern side PB Circuit Board Component side Pattern side 2NA-WZ43510...
Page 54 PSR-S750/PSR-S950 Scale: 90/100 MK-L Circuit Board I’ I’ J’ J’ Component side EMKS61A Circuit Board Component side EMKS61A: 2NA-WF31010 MK-L: 2NA-VV58380...
Page 55 PSR-S750/PSR-S950 Scale: 90/100 MK-H Circuit Board K’ L’ K’ L’ Component side EMKS61A Circuit Board Pattern side EMKS61A: 2NA-WF31010 MK-H: 2NA-VV58390...
Page 56: Psr-S750 Test Program
PSR-S750/PSR-S950 PSR-S750 TEST PROGRAM If you execute Test No. 43 Factory Set, setting data and user data will be lost. Be sure to save these data for backup in advance. Measurement Conditions 1-1: Measuring Instruments · Level meter (with a JIS-C ﬁ lter).
Page 57 001 : Version Checking the version of the ROM. Change the page with TAB [2] [3] switches. [Page 1] PSR-S750 (E) MAIN PROG ROM : ＊ . ＊＊ MAIN DATA ROM : ＊ . ＊＊ Wave 1 ROM : ＊ . ＊＊...
Page 58 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 009 : Output R Check Checking the R channel output. Set the [MASTER VOLUME] control to the maximum position in advance of testing. * It is not possible to operate the VOLUME control while testing.
Page 59 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 017 : SIOF Check Checking SIOF. Have the sound produced from 2 SIOF signal lines (Line-A, Line-B) using the [TAB 2 3] button to check for correct connection. Line-A [TAB 2]: A3 (441 Hz) sound is produced from L channel. “Line-A” is displayed on the LCD.
Page 60 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 028 : Pitch Bend Wheel Check Checking PITCH BEND. When the test is started, “ Pitch Bend Up 128 ” is displayed. Set the [PITCH BEND] wheel to the maximum position and check that the G3 sound is pro- duced and “...
Page 61 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 038 : Backup ROM Check2 Checking the BACKUP ROM connected to the CPU bus. (Complete check) Check that “Backup ROM Check2 OK” is displayed on the LCD. It will take about 1 minute for the check.
Page 62 PSR-S750/PSR-S950 Switch Test Sequence (PSR-S750) Turn SW Name / Display Note number Turn SW Name / Display Note number Turn SW Name / Display Note number SELECT SYNC STOP CHOIR & PAD SCORE SYNC START ORGAN FLUTES LYRICS/TEXT START/STOP STRINGS...
Page 63: Psr-S950 Test Program
PSR-S750/PSR-S950 PSR-S950 TEST PROGRAM If you execute Test No. 47 Factory Set, setting data and user data will be lost. Be sure to save these data for backup in advance. Measurement Conditions 1-1: Measuring Instruments · Level meter (with a JIS-C ﬁ lter).
Page 64 PSR-S750/PSR-S950 Tests Overview Test No. LCD display Test descriptions, judging conditions, etc. 001 : Version Checking the version of the ROM. Change the page with TAB [2] [3] switches. [Page 1] PSR-S950 (E) : ＊ . ＊＊ MAIN BOOT ROM : ＊...
Page 65 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 009 : Pitch Check Checking sound pitch. Pitch accuracy check: Connect a frequency counter to the [PHONES] jack. (Either L or R) When the test is executed, a sound is produced with 441 ±0.2 Hz sine wave from the L and R channels.
Page 66 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 017 : SIOF Check Checking SIOF. Have the sound produced from 2 SIOF signal lines (Line-A, Line-B) using the [TAB 2 3] button to check for correct connection. Line-A [TAB 2]: A3 (441 Hz) sound is produced from L channel and muted repeatedly at 1-second intervals.
Page 67 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 027 : LCD Backlight Off Check Checking LCD backlight for ON/OFF function. Switch the backlight ON and OFF with the [TAB 2 3] button. 028 : Main Volume Check Checking the main volume.
Page 68 PSR-S750/PSR-S950 Test No. LCD display Test descriptions, judging conditions, etc. 037 : USB to Device/Host Check Checking USB Device/Host. Enter the test with the [START/STOP] button and “Connect Device – Host” will be shown on the LCD. Connect the USB cable to [USB TO DEVICE] and [USB TO HOST] terminals and check that “Device –...
Page 69 PSR-S750/PSR-S950 ● Other Tests AUX IN Check that the output is as shown in the following table when signals are input to the AUX IN. OUTPUT (10 kΩ load) PHONES (33 Ω load) OUTPUT INPUT L/L+R AUX IN L: Sine wave (1 kHz, 0 dBu) +7.4 ±...
Page 70 PSR-S750/PSR-S950 Switch Test Sequence (PSR-S950) Turn SW Name / Display Note number Turn SW Name / Display Note number Turn SW Name / Display Note number SELECT ENDING/rit.Ⅲ TRUMPET SCORE SYNC STOP CHOIR & PAD LYRICS/TEXT SYNC START ORGAN FLUTES...
Page 71: Psr-S750 System Booting Flowchart
PSR-S750/PSR-S950 PSR-S750 SYSTEM BOOTING FLOWCHART If accessing Program Flash doesn’t start, SWX08(IC2) Power ON may be faulty. Accessing Program Flash (IC22) starts. Setting CPU registers. If accessing SDRAM doesn’t start, SWX08 (IC2) may be faulty. Initializing SDRAM for BOOT, 0 clear, setting Accessing SDRAM (IC11, 12) constant.
Page 72 PSR-S750/PSR-S950 For example, power turned off while writing Has Factory Reset Is user drive partially been executed? damaged? Improper power shut down! Backup data and/or Userfiles have been lost. Owner name displayed. User drive repaired. Has clearing system backup If failed to reach here, possible cause may be in;...
Page 73: Psr-S950 System Booting Flowchart
PSR-S750/PSR-S950 PSR-S950 SYSTEM BOOTING FLOWCHART If accessing Program Flash Power ON doesn’t start, SH7731 (IC1) Main program may be faulty. should exist. Accessing Program Main program not found! Setting CPU registers. Flash (IC16) starts. If accessing SDRAM doesn’t Animation starts.
Page 74 PSR-S750/PSR-S950 2nd opening Test mode? Animation to 2nd screen screen displayed. Error Detect pulse output (IC18,1) Has Factory Set been executed? Test mode displayed. Owner name displayed. Data read from NAND (IC202) For example, power turned off while writing. Is user drive...
Page 75: Psr-S750 Dm Circuit Board Check Method
PSR-S750/PSR-S950 PSR-S750 DM CIRCUIT BOARD CHECK METHOD The DM Circuit Board is provided with test points for service check purposes. Check the test points on the DM Circuit Board if the following symptoms appear. Symptoms and check items q No LCD display with Power SW ON --> Check items 1 to 8 sequentially w No sound or distorted sound -->...
Page 76: Psr-S950 Dm Circuit Board Check Method
PSR-S750/PSR-S950 PSR-S950 DM CIRCUIT BOARD CHECK METHOD The DM Circuit Board is provided with test points for service check purposes. Check the test points on the DM Circuit Board if the following symptoms appear. Symptoms and check items q No LCD display with Power SW ON --> Check items 1 to 4 sequentially w No sound or distorted sound -->...
Page 77: Data Backup
This procedure backs up all data saved in USER drive (except Protected Songs and Expansion Voices/Styles) and all settings of the instrument to a USB ﬂ ash memory. Yamaha recommends that you back up important data to a USB ﬂ ash memory since the data in the instrument may be lost on occasion through malfunction or incorrect operation.
Page 78: System Reset
PSR-S750/PSR-S950 SYSTEM RESET There are two reset methods in the SYSTEM RESET display: Factory Reset and Custom Reset. Custom Reset (see page 75) Factory Reset (see below) • Factory Reset—Restoring the Factory Programmed Settings This function lets you restore the status of the instrument to the original factory settings.
Page 79 PSR-S750/PSR-S950 • Custom Reset—Saving and Recalling Your Original Settings as a Single File For the items below, you can save your Original Settings as a Single File for future recall. Make all desired settings on the instrument. Call up the operation display.
Page 80: Parts List
KEYBOARD ASSEMBLY ..........5 UPPER CASE ASSEMBLY ..........6 CENTER PANEL ASSEMBLY .......... 8 LOWER CASE ASSEMBLY ..........10 ELECTRICAL PARTS (PSR-S750)......12–26 ELECTRICAL PARTS (PSR-S950)......27–48 Notes : DESTINATION ABBREVIATIONS A : Australian model M : South African model...
Page 81: Overall Assembly
PSR-S750/PSR-S950 OVERALL ASSEMBLY Upper case assembly : See page 6. PSR-S950 Keyboard assembly 0nly PSR-S950 : See page 5. 0nly PSR-S950 0nly Lower case assembly : See page 10. 280 230 PSR-S750 Bottom board assembly * This figure shows the PSR-S950.
Page 82 PSR-S750/PSR-S950 LOWER CASE ASSEMBLY AJACK UPPER CASE ASSEMBLY * This figure shows the PSR-S950. *1: This figure shows the PSR-S750. AJACK...
Page 83 16M C61-2M-EBUS ボリュームツマミ MASTER VOLUME WZ703600 VOLUME KNOB BLACK エンコーダー成形品 PSR-S750 Data entry ZA304900 ENCODER KNOB BLACK WZ703500 ENCODER KNOB エンコーダーツマミ PSR-S950 Data entry ZA703300 LCD COVER Ｌ...
Page 84: Keyboard Assembly
PART NO. REMARKS REF NO. RANK KEYBOARD ASSEMBLY １６Ｍ鍵盤ＥＭＫＳＡ PSR-S750/PSR-S950 WB91420R KEYBOARD ASSEMBLY 16M C61-2M-EBUS １６Ｍ鍵盤ＥＭＫＳＡ WF266600 BIND HEAD TAPPING SCREW-P 3.0X8 MFZN2B3 Ｐ...
Page 85: Upper Case Assembly
PSR-S750/PSR-S950 UPPER CASE ASSEMBLY Center panel assembly : See page 8. Upper case 300a 300b Wheel assembly * This figure shows the PSR-S950.
Page 86 上ケ − スＡｓｓ ’ ｙ PSR-S950 (WZ89810) WZ898500 UPPER CASE SUB ASSEMBLY 上ケ − スサブＡｓｓ ’ ｙ PSR-S750 WZ898400 UPPER CASE SUB ASSEMBLY 上ケ − スサブＡｓｓ ’ ｙ PSR-S950 上...
Page 87: Center Panel Assembly
PSR-S750/PSR-S950 CENTER PANEL ASSEMBLY Center panel sub assembly L60a L110 L60a L120 L100 L60a L60a L120 LCD assembly LCD assembly PSR-S750 PSR-S950 only PSR-S950 PSR-S950 only * This figure shows the PSR-S950.
Page 88 ＣパネルＡｓｓ ’ ｙ PSR-S950 (WZ89890) WZ899200 CENTER PANEL SUB ASSEMBLY ＣパネルサブＡｓｓ ’ ｙ PSR-S750 WZ899100 CENTER PANEL SUB ASSEMBLY ＣパネルサブＡｓｓ ’ ｙ PSR-S950 Ｃ...
Page 89: Lower Case Assembly
PSR-S750/PSR-S950 LOWER CASE ASSEMBLY PSR-S750 PSR-S750 PSR-S750 only Lower case sub assembly * This figure shows the PSR-S950.
Page 90 名 REMARKS REF NO. RANK LOWER CASE ASSEMBLY 下ケ − スＡｓｓ ’ ｙ PSR-S750/PSR-S950 LOWER CASE ASSEMBLY 下ケ − スＡｓｓ ’ ｙ PSR-S750 (WZ89870) LOWER CASE ASSEMBLY 下ケ − スＡｓｓ ’ ｙ PSR-S950...
Page 91: Electrical Parts (Psr-S750)
PSR-S750 ELECTRICAL PARTS (PSR-S750) AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK ELECTRICAL PARTS 電気部品 PSR-S750 WZ435600 CIRCUIT BOARD AJACK ＡＪＡＣＫシート (WZ43520)(YD887B0) WZ435400 CIRCUIT BOARD Ｈ...
Page 92 PSR-S750 AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK US062100 CERAMIC CAPACITOR (CHIP) 100P 50V J RECT. チップセラ（ＳＬ） US062470 CERAMIC CAPACITOR (CHIP) 470P 50V J RECT. チップセラ（ＳＬ）...
Page 93 PSR-S750 AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD355221 CARBON RESISTOR (CHIP) 220.0 63M J RECT. チップ抵抗 RD358100 CARBON RESISTOR (CHIP) 100.0K 63M J RECT. チップ抵抗 RD357100 CARBON RESISTOR (CHIP) 10.0K 63M J RECT.
Page 94 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK WZ353700 CIRCUIT BOARD ＤＭシート (YD855C0) CN307 WK450700 CONNECTOR USB YKF45-0033N 4P SE ＵＳＢコネクタ TO DEVICE CN307 WH382500 CONNECTOR USB UAR27-4K2J00 Ｕ...
Page 95 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK C626 US662390 CERAMIC CAPACITOR (CHIP) 390P 50V K RECT. チップセラ（Ｂ） -629 US662390 CERAMIC CAPACITOR (CHIP) 390P 50V K RECT. チップセラ（Ｂ）...
Page 96 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK R539 RD45000R CARBON RESISTOR (CHIP) 0.00 63M J RECT. チップ抵抗 R543 RD457150 CARBON RESISTOR (CHIP) 15.0K 63M J RECT. チップ抵抗...
Page 97 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK -140 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ） C141 US662100 CERAMIC CAPACITOR (CHIP) 100P 50V J RECT. チップセラ（ＣＨ）...
Page 98 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK C548 WG888300 MONOLITHIC CERAMIC CAP(CHIP) 10.0 6.3V K TP チップ積層セラコン C549 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ）...
Page 99 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK YD933A00 IC RP131H151D-T1-FE ＩＣ REGULATOR +1.5V X8382A00 IC TC7WH08FK(TE85L,F) ＩＣ YE509A00 IC HD74LV2G08AUSE ＩＣ X3693A01 IC SN74LV245APWR ＩＣ TRANSCEIVER IC14 X5422A00 IC S1D13700F01A100 Ｉ...
Page 100 PSR-S750 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK R110 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 R114 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗...
Page 101 PSR-S750 DM and PNC/PNL/PNR PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK R509 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 R510 RD458100 CARBON RESISTOR (CHIP) 100.0K 63M J RECT. チッ...
Page 102 PSR-S750 PNC/PNL/PNR and PNM/PNS PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK WJ491600 LED (CHIP) AMBER/Y.GREEN BL-HJFGE36J-TRB チップ２色ＬＥＤ INTRO I WJ491700 LED (CHIP) AMBER BL-HJF36J-TRB チップＬＥ...
Page 103 PSR-S750 PNM/PNS PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK LD22 WJ491700 LED (CHIP) AMBER BL-HJF36J-TRB チップＬＥＤ LEFT HOLD (PART ON/OFF) LD23 WJ491700 LED (CHIP) AMBER BL-HJF36J-TRB チップＬＥ...
Page 104 PSR-S750 PNM/PNS PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK WC195200 CONNECTOR FFC/FPC 52808 14P TE ＦＦＣ／ＦＰＣコネクタ WG139300 DIODE KDS4148U-RTK/P TE ダイオード WG139300 DIODE KDS4148U-RTK/P TE ダ...
Page 105 PSR-S750 PNM/PNS and EMKS61A and MK-H and MK-L PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD350001 CARBON RESISTOR (CHIP) 0 63M J RECT. チップ抵抗 RD358470 CARBON RESISTOR (CHIP) 470.0K 63M J RECT.
Page 106: Electrical Parts (Psr-S950)
PSR-S950 ELECTRICAL PARTS (PSR-S950) AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK ELECTRICAL PARTS 電気部品 PSR-S950 WZ435500 CIRCUIT BOARD AJACK ＡＪＡＣＫシート (WZ43510)(YD887D0) WZ435300 CIRCUIT BOARD ＨＰ...
Page 107 PSR-S950 AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK US065100 CERAMIC CAPACITOR (CHIP) 0.100 50V Z RECT. チップセラＦ US065100 CERAMIC CAPACITOR (CHIP) 0.100 50V Z RECT. チップセラＦ US065100 CERAMIC CAPACITOR (CHIP) 0.100 50V Z RECT.
Page 108 PSR-S950 AJACK/HP/MOD/PB PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD356470 CARBON RESISTOR (CHIP) 4.7K 63M J RECT. チップ抵抗 RD355100 CARBON RESISTOR (CHIP) 100.0 63M J RECT. チップ抵抗 RD355100 CARBON RESISTOR (CHIP) 100.0 63M J RECT.
Page 109 PSR-S950 AJACK/HP/MOD/PB and DM PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK UN848220 ELECTROLYTIC CAPACITOR BP 220.00 25.0V RX TP ＢＰケミコン UN848220 ELECTROLYTIC CAPACITOR BP 220.00 25.0V RX TP ＢＰケミ...
Page 110 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK WG888300 MONOLITHIC CERAMIC CAP(CHIP) 10.0 6.3V K TP チップ積層セラコン US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ） US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT.
Page 111 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK C528 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ） C604 US662100 CERAMIC CAPACITOR (CHIP) 100P 50V J RECT. チップセラ（ＣＨ） C606 US662100 CERAMIC CAPACITOR (CHIP) 100P 50V J RECT.
Page 112 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD454330 CARBON RESISTOR (CHIP) 33.0 63M J RECT. チップ抵抗 RD456100 CARBON RESISTOR (CHIP) 1.0K 63M J RECT. チップ抵抗 RD457100 CARBON RESISTOR (CHIP) 10.0K 63M J RECT.
Page 113 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK -444 RD45000R CARBON RESISTOR (CHIP) 0.00 63M J RECT. チップ抵抗 R446 RD45000R CARBON RESISTOR (CHIP) 0.00 63M J RECT. チップ抵抗 -449 RD45000R CARBON RESISTOR (CHIP) 0.00 63M J RECT.
Page 114 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RA237 WH205600 RESISTOR ARRAY 27 X 4 抵抗アレイ RA429 WH211800 RESISTOR ARRAY 10K X 4 抵抗アレイ -432 WH211800 RESISTOR ARRAY 10K X 4 抵...
Page 115 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK -353 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ） C413 US661330 CERAMIC CAPACITOR (CHIP) 33P 50V J RECT. チップセラ（ＣＨ） -417 US661330 CERAMIC CAPACITOR (CHIP) 33P 50V J RECT.
Page 116 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK C801 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT. チップセラ（ＢＪ） C816 WG888300 MONOLITHIC CERAMIC CAP(CHIP) 10.0 6.3V K TP チップ積層セラコン C817 US625100 CERAMIC CAPACITOR (CHIP) 0.100 10V K RECT.
Page 117 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK C922 V 8 0 8 5 4 0 0 CERAMIC CAPACITOR (CHIP) 0.1000 25V K RECT. チップセラ（Ｂ） C923 V 8 0 8 5 4 0 0 CERAMIC CAPACITOR (CHIP) 0.1000 25V K RECT.
Page 118 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK X3693A01 IC SN74LV245APWR ＩＣ TRANSCEIVER IC15 XY806A0R IC TC7WH14FU(TE12L,F) ＩＣ INVERTER IC21 X5825A00 IC SN74LVC1G32DCKR ＩＣ OR GATE IC22 VR90370R PHOTO COUPLER HCPL-M600-500E フォト...
Page 119 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 RD457100 CARBON RESISTOR (CHIP) 10.0K 63M J RECT.
Page 120 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK R483 RD45547R CARBON RESISTOR (CHIP) 470.0 63M J RECT. チップ抵抗 R485 RD45427R CARBON RESISTOR (CHIP) 27.0 63M J RECT. チップ抵抗 R486 RD45427R CARBON RESISTOR (CHIP) 27.0 63M J RECT.
Page 121 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK -681 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 R684 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT. チップ抵抗 R685 RD454680 CARBON RESISTOR (CHIP) 68.0 63M J RECT.
Page 122 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK R919 RD455100 CARBON RESISTOR (CHIP) 100.0 63M J RECT. チップ抵抗 R920 RD455100 CARBON RESISTOR (CHIP) 100.0 63M J RECT. チップ抵抗 R922 RD458100 CARBON RESISTOR (CHIP) 100.0K 63M J RECT.
Page 123 PSR-S950 DM and PNC/PNL/PNR PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK -428 WH205600 RESISTOR ARRAY 27 X 4 抵抗アレイ RA601 WH206600 RESISTOR ARRAY 68 X 4 抵抗アレイ -610 WH206600 RESISTOR ARRAY 68 X 4 抵...
Page 124 PSR-S950 PNC/PNL/PNR and PNM/PNS PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK CN11 WC195200 CONNECTOR FFC/FPC 52808 14P TE ＦＦＣ／ＦＰＣコネクタ WG139300 DIODE KDS4148U-RTK/P TE ダイオー...
Page 125 PSR-S950 PNM/PNS PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK US14510R CERAMIC CAPACITOR (CHIP) 0.1000 25V Z RECT. チップセラ（Ｆ） US063100 CERAMIC CAPACITOR (CHIP) 1000P 50V K RECT. チップセラ（Ｂ） US063100 CERAMIC CAPACITOR (CHIP) 1000P 50V K RECT.
Page 126 PSR-S950 PNM/PNS and EMKS61A and MK-H and MK-L PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK RD356100 CARBON RESISTOR (CHIP) 1.0K 63M J RECT. チップ抵抗 RD354470 CARBON RESISTOR (CHIP) 47.0 63M J RECT. チ...
Page 127 PSR-S950 PART NO. DESCRIPTION 部品名 REMARKS REF NO. QTY RANK YE177A00 SPEAKER 13.0cm 4ohm 35W スピーカ WOOFER YE179A00 SPEAKER 2.5cm 4ohm 20W スピーカ TWEETER WZ590800 CRYSTAL DISPLAY COM57T5M52GSC 液晶ディスプレイ : New Parts RANK: Japan only...
Page 128: Block Diagram
■ PSR-S750 BLOCK DIAGRAM PSR-S750/PSR-S950 61 KEYS 16M KEYBOARD SW & LED SW & LED SW & LED MATRIX MATRIX MATRIX MK-H (7P) MK-L CN300 CN11 (3P) (29P) (16P) (14P) (A#3~C6) (C1~A3) VR300 (29P) (16P) (14P) (12P) (7P) (5P) PITCH BEND...
Page 129: Block Diagram
■ PSR-S950 BLOCK DIAGRAM PSR-S750/PSR-S950 61 KEYS 16M KEYBOARD SW & LED SW & LED SW & LED MATRIX MATRIX MATRIX MK-H MK-L (7P) CN300 CN301 CN11 (A#3~C6) (C1~A3) (3P) (4P) (29P) (16P) (14P) AJACK VR300 VR301 (29P) (16P) (14P)
Page 130: Parts List
<Page 1> PSR-S750 PSR-S750 DM 001 CIRCUIT DIAGRAM (1/11) TRANSCEIVER SWP51L FLASH ROM 128M BACKUP SWX08 SDRAM 256M INVERTER VOLTAGE DETECTOR SDRAM 256M FLASH ROM 256M PROGRAM SWX08 TRANSCEIVER INVERTER SWP51L SWX08 LCDC CONTENTS PSR-S750/PSR-S950 OVERALL CIRCUIT DIAGRAM MOD ......... 10 AJACK ......
Page 131: Parts List
<Page 2> PSR-S750 PSR-S750 DM 002 CIRCUIT DIAGRAM (2/11) SWX08 SWX08 SWP51L SWX08 INVERTER PHOTO COUPLER INVERTER SDRAM 64M not installed not installed INVERTER SWX08 to PNM-CN1 <Page 9: P-1> to EMKS61A-CN1 <Page 10: V-15> SWP51L SWP51L USB HIGH-SIDE POWER SW...
Page 132: Parts List
<Page 3> PSR-S750 PSR-S750 DM 003 CIRCUIT DIAGRAM (3/11) SINGLE SHOT to AJACK-CN1 <Page 10: V-7> SYSTEM RESET not installed OP AMP OP AMP to AJACK-CN2 <Page 10: V-4> OP AMP OP AMP REGULATOR +5V DC-DC CONVERTER to AJACK-CN4 DIGITAL AMP <Page 10: P-9>...
Page 133: Parts List
<Page 4> PSR-S950 PSR-S950 DM 001 CIRCUIT DIAGRAM (4/11) TRANSCEIVER +3.3D 0.1u MA[1] PRA[1] MA[1] BRA[1] R8A77310D333BG MA[2] PRA[2] MA[2] BRA[2] SN74LV245APWR MA[3] PRA[3] MA[3] RA44 BRA[3] FLASH ROM 64M BACKUP RA35 FLASH ROM 64M BOOT PRG. MA[4] PRA[4] MA[4] BRA[4] AC11 A[1]...
Page 134: Parts List
<Page 5> PSR-S950 PSR-S950 DM 002 CIRCUIT DIAGRAM (5/11) R8A77310D333BG RD[63] HPD63/PTN7 RA203 RD[62] HPD62/PTN6 27*4 RD[61] HPD61/PTN5 RD[60] HPD60/PTN4 RD[59] HPD59/PTN3 RA204 RD[58] HPD58/PTN2 27*4 RD[57] HPD57/PTN1 RD[56] HPD56/PTN0 RD[55] HPD55/PTB7 RA205 RD[54] HPD54/PTB6 27*4 RD[53] HPD53/PTB5 +3.3D +3.3D +3.3D +3.3D +3.3D...
Page 135: Parts List
<Page 6> PSR-S950 PSR-S950 DM 003 CIRCUIT DIAGRAM (6/11) +3.3D R464 R465 P1 SDA N2 SCL R541 H1 XTALUSB R545 R528 G1 EXTALUSB VBUS 1/16W C1 DM 2.2K D1 DP R542 F4 VBUS R462 5.6K To Host USB1.1 E1 REFRIN JC0.5 F1 AG33 C450...
Page 136: Parts List
<Page 7> PSR-S950 PSR-S950 DM 004 CIRCUIT DIAGRAM (7/11) SWP51L IC601 T6TJ3XBG-0001 +1.5SW +3.3D R604 SWP51L SWP51L_M 5/6 C623 +3.3D SIOF-SYNC 001:G10 R656 1.5K WCLK1 R605 IC601 WCLK0 005:K2,006:K3,F3 SWP51L WCLK0 R606 C621 T6TJ3XBG-0001 +3.3D ADLR 004:C11,006:K4 0.1u REGULATOR +1.5V ADLR TL601 IC601...
Page 138: Parts List
<Page 9> PSR-S750/PSR-S950 PSR-S750/PSR-S950 PNC, PNL, PNM, PNR, PNS CIRCUIT DIAGRAM (10/11) GUIDE USB AUDIO SW90 SELECT SCORE LYRICS/TEXT SW96 SW35 PLAYER SW17 SW25 S[15] S[16] S[15] S[15] E-IC E-IC S[15] to DM-CN303 (PSR-S750) KDS4148U-RTK/P KDS4148U-RTK/P KDS4148U-RTK/P D120 <Page 2: D-7>...
Page 139: Parts List
<Page 10> PSR-S750/PSR-S950 PSR-S750/PSR-S950 AJACK, EMKS61A, HP, MK-H, MK-L, MOD, PB CIRCUIT DIAGRAM (11/11) NETWORK LINE SSSF122 AJACK PSR-S750 only GAIN:+16.3dB XH6P SW100 LPF:fc=23kHz PSR-S950 only GAIN:+11.9dB 470P to SP Lch (Wo, Tw) (PSR-S750 only) 1/50 LPF:fc=6kHz 3.3/50 1/50 4.7K...

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Psr-s950