Yamaha PSR-S750 User manual

HAMAMATSU, JAPAN
PK 001876
SERVICE MANUAL
Copyright (c) Yamaha Corporation. All rights reserved. PDF ’12.08
SPECIFICATIONS .......................................................3
PANEL LAYOUT ..........................................................5
CIRCUIT BOARD LAYOUT & WIRING........................8
DISASSEMBLY PROCEDURE..................................12
LSI PIN DESCRIPTION.............................................22
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
BLOCK DIAGRAM
OVERALL CIRCUIT DIAGRAM
CONTENTS
',*,7$/:25.67$7,21
PSR-S750
PSR-S950

PSR-S750/PSR-S950
2
WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
WARNING: This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/
flux vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.
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.
WARNING : Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury,
destruction of expensive components and failure of the product to perform as specified. For these reasons, we advise
all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the
appointed service representative.
IMPORTANT : This presentation or sale of this manual to any individual or firm does not constitute authorization certification,
recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form.
The data provided is belived to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service
departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in
specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the
distributor’s Service Division.
WARNING : Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated
by grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus.)
IMPORTANT : Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.
■SAVING DATA
• The edited Songs/Styles/Voices/Multi Pads and MIDI settings are lost when you turn off the power of the instrument without
saving. Save the edited data to the instrument (USER tab display) or a USB flash memory (USB tab display). Moreover, it
is safer to save the data to a USB flash memory, because the data in the USER tab display may be lost due to malfunction
or incorrect operation. To protect against data loss through USB flash memory damage, we recommend that you save your
important data onto two USB flash memories.
• Data other than above (edited Songs/Styles/Voices/Multi Pads and MIDI settings) is automatically stored, when you change
the settings in a display page and then exit from that page. However, the data is lost if you turn off the power without properly
exiting from the relevant display.
Be sure to
perform it
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT. The wires in this mains lead are coloured in accor-
dance with the following code:
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may
not correspond with the coloured makings identifying the terminals in
your plug proceed as follows:
The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the termi-
nal which is marked with the letter L or coloured RED.
Making sure that neither core is connected to the earth terminal of
the three pin plug.
(2 wires)

3
PSR-S750/PSR-S950
SPECIFICATIONS
PSR-S950 PSR-S750
Size and Weight 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”)
Weight (without Music Rest) 11.5 kg (25 lbs., 6 oz.) 11 kg (24 lbs., 4 oz.)
Interface
Keyboard
Number of Keys 61
Type Organ
Touch Response Hard 2, Hard 1, Medium, Soft 1, Soft 2
Controllers Pitch Bend Wheel Yes
Modulation Wheel Yes
Display
Type 5.7 inch color LCD
(320 x 240 dots TFT QVGA)
5.7 inch B/W LCD
(320 x 240 dots STN QVGA)
Contrast — Yes
Language English, German, French, Spanish, Italian
Panel Language English
Voices
Tone Generation Tone Generation
Technology AWM Stereo Sampling
Polyphony Number of Polyphony
(Max.) 128
Preset
Number of Voices 786 + 33 Drum/SFX Kits + 480 XG +
GM2 + GS (for GS Song Playback)
678 + 28 Drum/SFX Kits + 480 XG +
GM2 + GS (for GS Song Playback)
Featured Voices
62 Super Articulation, 23 Mega
Voices, 27 Sweet!, 64 Cool!, 39 Live!,
20 Organ Flutes!
38 Super Articulation, 18 Mega
Voices, 24 Sweet!, 46 Cool!, 29 Live!,
10 Organ Flutes!
Expandability Expansion Voice Yes (approx. 64 MB max.)
Editing Voice Set
Compatibility XG, XF, GS, GM, GM2
Part Right 1, Right 2, Left
Styles
Preset
Number of Styles 408 325
Featured Styles 25 +Audio, 1 FreePlay, 350 Pro,
32 Session 295 Pro, 30 Session
Fingering Single Finger, Fingered, Fingered On Bass, Multi Finger, AI Fingered,
Full Keyboard, AI Full Keyboard
Style Control INTRO x 3, MAIN VARIATION x 4, FILL x 4, BREAK, ENDING x 3
Compatibility Style File Format, Style File Format GE
Expandability Expansion Style Yes
Expansion Audio Style Yes (approx. 64 MB max.) —
Other Features Music Finder (Max.) 2,500 Records 1,200 Records
One Touch Setting (OTS) 4 for each Style
Songs
Preset Number of Songs 5
Recording
Number of Songs Unlimited (depending on USB flash memory capacity)
Number of Tracks 16
Data Capacity approx. 300 KB/Song
Recording Function Quick Recording, Multi Recording, Step Recording
Data Format Playback SMF (Format 0 & 1), XF
Recording SMF (Format 0)
Multi Pads Preset Number of Multi Pad
Banks 126 banks x 4 Pads 123 banks x 4 Pads
Audio Audio Link Yes
Functions
Voices
Voice Creator Yes
Harmony/Echo Yes
Panel Sustain Yes
Mono/Poly Yes
Voice Information Yes
Styles
Style Creator Yes
Style Recommender Yes
OTS Information Yes
Songs
Song Creator Yes
Score Display Function Yes
Lyrics Display Function Yes
Lesson/Guide Follow Lights, Any Key, Karao-Key, Your Tempo
Performance Assistant
Technology (P.A.T.) Yes
Multi Pads Multi Pad Creator Yes

PSR-S750/PSR-S950
4
Functions
Registration Memory Number of Buttons 8 presets/bank
(unlimited number of banks, depending on USB flash memory capacity)
Control Registration Sequence, Freeze
USB Audio
Recording .wav
Playback .wav,.mp3 .wav
Time Stretch Yes —
Pitch Shift Yes —
Vocal Cancel Yes —
Demo/Help Demonstration Yes
Overall Controls
Metronome Yes
Tempo 5 – 500, Tap Tempo
Transpose -12 – 0 – +12
Tuning 414.8 – 440 – 466.8 Hz
Octave Button Yes
Scale Type 9 Presets
Miscellaneous
Text Display Function Yes
Wallpaper Customization Main, Lyrics —
Direct Access Yes
Effects
Reverb 44 Presets + 3 User
Chorus 106 Presets + 3 User 71 Presets + 3 User
DSP DSP 1: 295 Presets + 3 User,
DSP 2-4: 295 Presets + 10 User
DSP 1: 295 Presets + 3 User,
DSP 2-4: 128 Presets + 10 User
Master EQ 5 Presets + 2 User
Part EQ 28 Parts (Right 1, Right 2, Left, Multi Pad, Style x 8, Song x 16)
Mic Effects Noise Gate x 1, Compressor x 1,
3Band EQ x 1 —
Vocal Harmony
Number of Presets 44 —
Number of User Settings 60 —
Vocal Effect 23 —
Storage
Internal Memory approx. 6.7 MB approx. 1.9 MB
Internal Memory (for
Expansion Pack) approx. 64 MB
External Drives USB Flash Memory, etc. (via USB TO DEVICE)
Connections
DC IN 16 V
Microphone Yes —
AUX IN Yes
Headphones Yes
OUTPUT R, L/L+R
VIDEO OUT Yes —
FOOT PEDAL (optional) Switch or Volume x 2
USB TO DEVICE Yes
USB TO HOST Yes
MIDI In/Out
Amplifiers and
Speakers
Amplifiers 15 W x 2
Speakers 13 cm + 2.5 cm dome tweeter (x 2) 13 cm + 5 cm (x 2)
Pedals Assignable Functions Volume, Sustain, Sostenuto, Soft, Glide, S. Articulation, Song Play/Pause,
Style Start/Stop, etc.
Power Supply
AC Power Adaptor PA-300C or an equivalent recommended by Yamaha
Power Consumption 16 W 13 W
Auto Power Off Function Yes
Included Accessories
• Owner’s Manual
• Online Member Product Registration
You will need the PRODUCT ID on the sheet in order to fill out the User
Registration form.
• 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.
Optional
Accessories
AC Power Adaptor PA-300C or an equivalent recommended by Yamaha
Headphones HPE-160
USB-MIDI Interface UX-16
Footswitches FC4/FC5
Foot controller FC7
Keyboard Stand
L-6/L-7
(The exterior size of the PSR-S950/S750 is beyond the limits as described in
the L-6 Assembly Instructions. However, we have determined through tests
that the stand can be safely used for the instrument.)
PSR-S950 PSR-S750

5
PSR-S750/PSR-S950
PANEL LAYOUT
■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)
i MIDI [IN]/[OUT] terminals
o [USB TO HOST] terminal
!0 [USB TO DEVICE] terminal
!1 [VIDEO OUT] jack (PSR-S950)
qw e r tyu i o !1!0
PSR-S950 only PSR-S950 only
• Rear Panel

PSR-S750/PSR-S950
6
(PSR-S750)
A
q
w
e
r
io
!2
!6
@0
!7
!8
!9
!3
!4
!0 !1
!5
u
y
t
• Front Panel
■Front Panel
q [ ] (Standby/On) switch
w [MASTER VOLUME] dial
e [DEMO] button
r [MIC SETTING/VOCAL HARMONY] button
(PSR-S950)
t SONG buttons
y STYLE category selection buttons
u [TAP TEMPO]/TEMPO buttons
i TRANSPOSE buttons
o [METRONOME] button
!0 [FADE IN/OUT] button
!1 STYLE CONTROL buttons
!2 [PITCH BEND] wheel
!3 [MODULATION] wheel
!4 [PHONES] jack
!5 [LCD CONTRAST] knob (PSR-S750)
!6 LCD and related controls
!7 [BALANCE] button
!8 [MIXING CONSOLE] button
!9 [CHANNEL ON/OFF] button
@0 [FUNCTION] button
@1 VOICE category selection buttons
@2 [USB AUDIO PLAYER] button
@3 [USB] button

7
PSR-S750/PSR-S950
A
A’
@8
@0
@3
@4
@9 #0
@5
@1 @2
@6
@7
#1
@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

PSR-S750/PSR-S950
8
CIRCUIT BOARD LAYOUT & WIRING
110
100
230 220 280 200 240
250
260
s4OPVIEW0323
s"OTTOMVIEW0323
SPEAKER (TWEETER)SPEAKER (TWEETER) SPEAKER (WOOFER)SPEAKER (WOOFER) LOWER CASE ASSEMBLY
UPPER CASE ASSEMBLY
DM
(0
AJACK
110
100
200 SHIELD COVER 260
AJACK

9
PSR-S750/PSR-S950
110
100
230 220 270 100 110
200
240
250
260
s4OPVIEW0323
s"OTTOMVIEW0323
SPEAKER (TWEETER)SPEAKER (TWEETER) SPEAKER (WOOFER)SPEAKER (WOOFER) LOWER CASE ASSEMBLY
UPPER CASE ASSEMBLY
DM
(0
AJACK
200 SHIELD COVER 260
AJACK

PSR-S750/PSR-S950
10
210
200
s"OTTOMVIEW
AJACK
* This figure shows the PSR-S950.
KEYBOARD ASSEMBLY
S7 S5 S4 S6
MK-H MK-L EMKS61A
480
0"
470 460 450 MOD
PNC PNL
PNR
s500%2#!3%!33%-",9
s#%.4%20!.%,!33%-",9
* This figure shows the PSR-S950.
L60L70
LCD ASSEMBLY
50
PNS PNM
LCD ASSEMBLY 50
L60L10
* This figure shows the PSR-S750.
PNMPNS

11
PSR-S750/PSR-S950
Unit Name Location Parts No. Parts Name Connection Remarks
OVERALL ASSEMBLY
200 (ZA57660) Connector Assembly XH_S DM CN500 - AJACK CN4 6P
210 (ZA57730) Connector Assembly PH-ZH_S AJACK CN9 - PNM CN2 8P
220 (ZA57680) Connector Assembly PH-ZH_S DM CN502 - AJACK CN2 11P
230 (ZA57690) Connector Assembly PH-ZH_S DM CN501 - AJACK CN1 6P
240 (ZA57710) Connector Assembly PH-ZH_S DM CN304 - EMKS61A CN1 7P
250 (ZE57690) Connector Assembly PH-LF_S DM CN303 - PNM CN1 9P
260 (ZA57760) Connector Assembly PH_S AJACK CN10 - HP CN200 5P
280 (ZC82020) Connector Assembly NET-LF_S DM CN504 - AJACK CN6 VH4P/XH5P
UPPER CASE ASSEMBLY
450 (ZA58150) Wiring Assembly FFC_S PNM CN3 - PNL CN1 29P-130
460 (ZA58160) Wiring Assembly FFC_S PNS CN6 - PNC CN4 16P-90
470 (ZE58980) Wiring Assembly FFC_PN PNS CN8 - PNR CN11 14P-115
480 (ZA57890) Connector Assembly PBMOD_S PNL CN3
- PB CN300
4P/3P
- MOD CN301
CENTER PANEL ASSEMBLY
50 (ZA58140) Wiring Assembly FFC_S PNM CN4 - PNS CN7 29P-230
L10 WR339600 LCD DM CN3 - LCD
L60 (ZA58130) Wiring Assembly FFC_S_FL DM CN2 - LCD 20P-150
LOWER CASE ASSEMBLY 100 (ZA58090) Connector Assembly SPR_S AJACK CN8-SP Rch (Wo, Tw) 4P
110 (ZA58100) Connector Assembly SPL_S AJACK CN7-SP Lch (Wo, Tw) 5P
KEYBOARD ASSEMBLY
S4 VU95890R Cable EMKS61A CN2 - MK-L 12P L=190
S5 VU65950R Cable MK-M - MK-L 12P
S6 VU65940R Cable EMKS61A CN4 - MK-L 7P
S7 VU65960R Cable EMKS61A CN3 - MK-H 5P
Unit Name Location Parts No. Parts Name Connection Remarks
OVERALL ASSEMBLY
200 (ZA57660) Connector Assembly XH_S DM CN901 - AJACK CN4 6P
210 (ZA57730) Connector Assembly PH-ZH_S AJACK CN9 - PNM CN2 8P
220 (ZA57680) Connector Assembly PH-ZH_S DM CN801 - AJACK CN2 11P
230 (ZA57690) Connector Assembly PH-ZH_S DM CN3 - AJACK CN1 6P
240 (ZA57710) Connector Assembly PH-ZH_S DM CN602 - EMKS61A CN1 7P
250 (ZA57740) Connector Assembly EBUS_S DM CN601 - PNM CN1 9P/7P
260 (ZA57760) Connector Assembly PH_S AJACK CN10 - HP CN200 5P
270 (ZA57700) Connector Assembly PH-ZH_S DM CN802 - AJACK CN3 3P
UPPER CASE ASSEMBLY
450 (ZA58150) Wiring Assembly FFC_S PNM CN3 - PNL CN1 29P-130
460 (ZA58160) Wiring Assembly FFC_S PNS CN6 - PNC CN4 16P-90
470 (ZE58980) Wiring Assembly FFC_PN PNS CN8 - PNR CN11 14P-115
480 (ZA57890) Connector Assembly PBMOD_S PNL CN3
- PB CN300
4P/3P
- MOD CN301
CENTER PANEL ASSEMBLY
50 (ZA58140) Wiring Assembly FFC_S PNM CN4 - PNS CN7 29P-230
L60 (ZA58120) Wiring Assembly FFC_S_FL DM CN401 - LCD 33P-145
L70 (ZA57880) Connector Assembly LCD-BL_S DM CN904 - LCD 4P
LOWER CASE ASSEMBLY 100 (ZA58080) Connector Assembly SPR_S DM CN903-SP Rch (Wo, Tw) 4P
110 (ZA58110) Connector Assembly SPL_S DM CN902-SP Lch (Wo, Tw) 5P
KEYBOARD ASSEMBLY
S4 VU95890R Cable EMKS61A CN2 - MK-L 12P L=190
S5 VU65950R Cable MK-M - MK-L 12P
S6 VU65940R Cable EMKS61A CN4 - MK-L 7P
S7 VU65960R Cable EMKS61A CN3 - MK-H 5P
●PSR-S750
Caution: Be sure to attach the removed filament tape just as it was before removal.
●PSR-S950
* The parts with “( )” in “Part No.” are not available as spare parts.

PSR-S750/PSR-S950
12
* Disassembly or assembly should be performed on a cloth so as not to damage the LCD.
* Install the filament tape and the harness clamp in the same way as they were before removal.
* Notes on Flat Cable
Contacts are visible from the back. Pay attention not to insert and install the
cable to the connector inversely. (Photo 1)
DISASSEMBLY PROCEDURE
Photo 1
Precautions
Front Side Back Side
1. Bottom Board Assembly
(Time required: About 4 minutes)
Remove the twenty-two (22) screws marked [450]. The
bottom board assembly can then be removed. (Fig. 1)
2. Lower Case Assembly
(Time required: About 4 minutes)
Remove the nine (9) screws marked [400], the five (5)
screws marked [410] and the four (4) screws marked
[420A]. The lower case assembly can then be removed.
(Fig. 2)
Fig. 1
Fig. 2
<Bottom view>
[410] [410]
[400]
[420A][400][420A]
[400]
LOWER CASE ASSEMBLY
<Bottom view>
[450] [450]
BOTTOM BOARD ASSEMBLY

13
PSR-S750/PSR-S950
3. HP Circuit Board
(Time required: About 4 minutes)
3-1. Remove the lower case assembly. (See procedure 2.)
3-2. Remove the three (3) screws marked [430A]. The HP
circuit board can then be removed. (Fig. 3)
4. Wheel Assembly, PB Circuit Board
(Time required: About 4 minutes)
4-1. Remove the lower case assembly. (See procedure 2.)
4-2. Remove the two (2) screws marked [500A]. The PB
circuit board can then be removed with the wheel
assembly. (Fig. 3)
* The wheel assembly is not part of the PB circuit
board. When replacing the PB circuit board, remove
the wheel assembly from the PB circuit board, and
install it on the new circuit board.
5. Wheel, MOD Circuit Board
(Time required: About 4 minutes)
5-1. Remove the lower case assembly. (See procedure 2.)
5-2. Remove the two (2) screws marked [500B]. The MOD
circuit board can then be removed with the wheel.
(Fig. 3)
* The wheel is not part of the MOD circuit board. When
replacing the MOD circuit board, remove the wheel
from the MOD circuit board, and install it on the new
circuit board.
<Rear view>
DM
HP
*1
DM
*1: This figure shows the PSR-S750.
[430A]
[500A]
[500B]
MOD
PB
[440B][440D]
* This figure shows the PSR-S950.
<Bottom view> [440C]
PSR-S950 only
[430B][430B][430B]
AJACK
[430B] [440A] [440A][430B][430B]
AJACK
UPPER CASE ASSEMBLY
Fig. 3

PSR-S750/PSR-S950
14
6. DM Circuit Board
(Time required: About 5 minutes)
6-1. Remove the lower case assembly. (See procedure 2.)
6-2. PSR-S750: Remove the eight (8) screws marked
[440A]. The DM circuit board can then be removed.
(Fig. 3)
6-3. PSR-S950: Remove the screw marked [440B] on the
rear and the six (6) screws marked [440C]. The DM
circuit board can then be removed. (Fig. 3)
7. AJACK Circuit Board
(Time required: About 5 minutes)
7-1. Remove the lower case assembly. (See procedure 2.)
7-2. Remove the two (2) screws marked [440D] on the rear
and the seven (7) screws marked [430B]. The AJACK
circuit board can then be removed. (Fig. 3)
8. Center Panel Assembly
(Time required: About 6 minutes)
8-1. Remove the lower case assembly. (See procedure 2.)
8-2. Remove the screw marked [440E] and the eight (8)
screws marked [510A]. (Fig. 4)
8-3. Remove the encoder knob. (Fig. 5)
8-4. Remove the screw marked [510B]. The center panel
assembly can then be removed. (Fig. 5)
* When installing the center panel assembly, fit claws of
the center panel into the holes in the upper case and
install the center panel in the arrow direction. (Fig. 6)
<Bottom view>
DM
HP
AJACK
DM
AJACK
*2
MOD
PB
[510A][510A]
[510A][510A]
[420B]
[420B]
[440E]
* This figure shows the PSR-S950.
UPPER CASE ASSEMBLY
[440E]
*2: This figure shows the PSR-S750.
KEYBOARD ASSEMBLY
Fig. 4

15
PSR-S750/PSR-S950
LCD ASSEMBLY
FFC_S WIRING ASSEMBLY
●CENTER PANEL ASSEMBLY (PSR-S750)
PNS
PNM
[300A]
[300A]
[300A]
[300A]
x
z
v
c
Fig. 5
Fig. 6
Fig. 7
VOLUME KNOB ENCORDER KNOB
SPEAKER GRILLE ASSEMBLY (L) SPEAKER GRILLE ASSEMBLY (R)
<Top view>
* This figure shows the PSR-S950. CENTER PANEL ASSEMBLY
[510B]
CLAWS
CENTER PANEL ASSEMBLY
UPPER CASE ASSEMBLY

PSR-S750/PSR-S950
16
9. Crystal Display (PSR-S750)
(Time required: About 7 minutes)
9-1. Remove the lower case assembly. (See procedure 2.)
9-2. Remove the center panel assembly. (See procedure 8.)
9-3. Remove the FFC_S wiring assembly. (Fig. 7)
9-4. Remove the four (4) screws marked [300A]. The LCD
assembly can then be removed. (Fig. 7)
* When installing the LCD assembly, tighten screws in
the order of zto vas shown in Fig. 7.
9-5. Remove the two (2) screws marked [L40A]. The LCD
fixture L can then be removed. (Fig. 9)
* When installing the LCD fixture L, tighten screws in
the order of zand xas shown in Fig. 9.
9-6. Remove the two (2) screws marked [L40B]. The LCD
fixture R can then be removed. (Fig. 9)
* When installing the LCD fixture R, tighten screws in
the order of zand xas shown in Fig. 9.
9-7. Remove the sponge. (Fig. 9)
* The sponge is not part of the crystal display. When
replacing the crystal display, remove the sponge
from the crystal display, and install it on the new
crystal display.
10. Crystal Display (PSR-S950)
(Time required: About 7 minutes)
10-1. Remove the lower case assembly. (See procedure 2.)
10-2. Remove the center panel assembly. (See procedure 8.)
10-3. Remove the FFC_S wiring assembly. (Fig. 8)
10-4. Remove the two (2) screws marked [300B]. The LCD
fixture L can then be removed. (Fig. 8)
10-5. Remove the two (2) screws marked [300C]. The LCD
fixture R can then be removed. (Fig. 8)
* When installing the LCD fixture, tighten screws while
pushing it in the arrow direction.
* When installing the LCD fixture, tighten screws in the
order of zto vas shown in Fig. 8.
10-6. Remove the crystal display.
10-7. Remove the FFC_S_LF wiring assembly and the
FFC_S_B wiring assembly. (Fig. 10)
<Bottom view>
●LCD ASSEMBLY (PSR-S950)
FFC_S_LF WIRING ASSEMBLY
FFC_S_B WIRING ASSEMBLY
CRYSTAL DISPLAY
Fig. 9
Fig. 8
Fig. 10
LCD ASSEMBLY
FFC_S WIRING ASSEMBLY
●CENTER PANEL ASSEMBLY (PSR-S950)
PNM
PNS
/&'),;785(/
/&'),;785(5
[300B]
[300B]
[300C]
[300C]
x
z
v
c
<Bottom view>
●LCD ASSEMBLY (PSR-S750)
CRYSTAL DISPLAY
LCD FIXTURE L
LCD FIXTURE R
[L40B] [L40A]
[L40B]
[L40A]
x
z
z
x
SPONGE

17
PSR-S750/PSR-S950
11. PNS Circuit Board
(Time required: About 9 minutes)
11-1. Remove the lower case assembly. (See procedure 2.)
11-2. Remove the center panel assembly. (See procedure 8.)
11-3. Remove the FFC_S wiring assembly.
(Fig. 7, Fig. 8)
11-4. Remove the nineteen (19) screws marked [300D].
The PNS circuit board can then be removed. (Fig. 11)
* When installing the PNS circuit board, fit the PNS
circuit board to the positioning pins at 2 locations
shown in Fig. 11 first, tighten the screws zand xin
that order and then tighten the other screws.
12. PNM Circuit Board (PSR-S750)
(Time required: About 10 minutes)
12-1. Remove the lower case assembly. (See procedure 2.)
12-2. Remove the center panel assembly. (See procedure 8.)
12-3. Remove the FFC_S wiring assembly. (Fig. 7)
12-4. Remove the LCD assembly. (See procedure 9-4.)
12-5. Remove the twenty-seven (27) screws marked [300E].
The PNM circuit board can then be removed. (Fig. 11)
* When installing the PNM circuit board, apply the PNM
circuit board to the positioning marks at 3 locations
shown in Fig. 11 first, tighten the screws zand xin
that order and then tighten the other screws.
13. PNM Circuit Board (PSR-S950)
(Time required: About 10 minutes)
13-1. Remove the lower case assembly. (See procedure 2.)
13-2. Remove the center panel assembly. (See procedure 8.)
13-3. Remove the FFC_S wiring assembly. (Fig. 8)
13-4. Remove the LCD fixture L. (See procedure 10-4.)
13-5. Remove the LCD fixture R. (See procedure 10-5.)
13-6. Remove the twenty-seven (27) screws marked [300E].
The PNM circuit board can then be removed. (Fig. 11)
* When installing the PNM circuit board, apply the PNM
circuit board to the positioning marks at 3 locations
shown in Fig. 11 first, tighten the screws zand xin
that order and then tighten the other screws.
14. Keyboard Assembly
(Time required: About 4 minutes)
14-1. Remove the lower case assembly. (See procedure 2.)
14-2. Remove the screw marked [420B]. The keyboard
assembly can then be removed. (Fig. 4)
Fig. 11
PNM
PNS
[300D] x 19
z
x
[300E] x 27
z
x
Positioning mark (applied to circuit board)Positioning pin (fit to circuit board)
Positioning pin (fit to circuit board)

PSR-S750/PSR-S950
18
15. PNL Circuit Board
(Time required: About 5 minutes)
15-1. Remove the lower case assembly. (See procedure 2.)
15-2. Remove the keyboard assembly. (See procedure 14.)
15-3. Remove the ten (10) screws marked [500C]. The PNL
circuit board can then be removed. (Fig. 12)
* When installing the PNL circuit board, tighten the
screws zand xshown in Fig. 12 in numerical order
and then tighten the other screws.
16. PNC Circuit Board
(Time required: About 5 minutes)
16-1. Remove the lower case assembly. (See procedure 2.)
16-2. Remove the keyboard assembly. (See procedure 14.)
16-3. Remove the ten (10) screws marked [500D].
The PNC
circuit board can then be removed. (Fig. 12)
* When installing the PNC circuit board, tighten the
screws zand xshown in Fig. 12 in numerical order
and then tighten the other screws.
17. PNR Circuit Board
(Time required: About 5 minutes)
17-1. Remove the lower case assembly. (See procedure 2.)
17-2. Remove the keyboard assembly. (See procedure 14.)
17-3. Remove the nine (9) screws marked [500E]. The PNR
circuit board can then be removed. (Fig. 12)
* When installing the PNR circuit board, tighten the
screws zand xshown in Fig. 12 in numerical order
and then tighten the other screws.
Projection [A] x 8 Projection [A] x 8
PB
MOD
s500%2#!3%!33%-",9
[500E] x 9 [500D] x 10 [500C] x 10
zx
zx
0.# 0.,
zx
0.2
* Only the two (2) projections of the
left speaker grille must be bent in
the counterclockwise direction.
Other projections can be bent in
any direction.
30°–40°
Fig. 12

19
PSR-S750/PSR-S950
18. Tweeter
(Time required: About 4 minutes)
18-1. Remove the lower case assembly. (See procedure 2.)
18-2. Remove the two (2) screws marked [210]. The tweeter
can then be removed. (Fig. 13)
* The left and right tweeters can be removed in the
same method.
19. Woofer
(Time required: About 4 minutes)
19-1. Remove the lower case assembly. (See procedure 2.)
19-2. Remove the four (4) screws marked [200]. The woofer
can then be removed. (Fig. 13)
* The left and right woofers can be removed in the
same method.
20. Speaker Grille Assembly
(Time required: About 5 minutes)
20-1. Remove the lower case assembly. (See procedure 2.)
20-2. Restraighten the eight (8) projections marked [A] to
come off the slots of the upper case assembly. (Fig. 12)
20-3. Remove the speaker grille assembly. (Fig. 5)
* The left and right speaker grille assembly can be
removed in the same method.
* Only the two (2) projections of the left SP grille must
be bent in the counterclockwise direction. Other
claws can be bent in any direction.
Fig. 13
s4OPVIEW
SPEAKER (TWEETER)
SPEAKER (TWEETER)
SPEAKER (WOOFER) SPEAKER (WOOFER)
LOWER CASE ASSEMBLY
[200] [200]
[210]
[210]

PSR-S750/PSR-S950
20
21-6. Rubber Contact
21-6-1. Remove the rubber contact. (Fig. 15) (Photo 2)
21-7. White and Black Keys
21-8. Remove the twenty-one (21) screws marked [140K],
then remove the black keys from the lower notes.
(Fig. 16)
21-8-1. Remove the white keys DFA and C’. (Fig. 16)
21-8-2. Remove the while keys CEGB from the higher notes.
(Fig. 16)
* Lift the front portion of the keys and slide them
towards you. The keys can then be removed from
the assembly.
21. Disassembling the Keyboard Assembly
21-1. Remove the lower case assembly. (See procedure 2.)
21-2. Remove the keyboard assembly. (See procedure 14.)
21-3. EMKS61A Circuit Board
(Time required: About 5 minutes)
21-3-1. Remove the two (2) screws marked [30]. The
EMKS61A circuit board can then be removed.
(Fig. 14)
21-4. MK-L Circuit Board
(Time required: About 6 minutes)
21-4-1. Remove the EMKS61A circuit board.
(See procedure 21-3.)
21-4-2. Remove the MK-L circuit board while pressing the
eight (8) hooks A in the direction of the arrow.
(Fig. 15)
21-5. MK-H Circuit Board
(Time required: About 6 minutes)
21-5-1. Remove the MK-H circuit board while pressing the
seven (7) hooks A in the direction of the arrow.
(Fig. 15)
HOOK A
BLACK KEY
RUBBER CONTACT
WHITE KEY
MK-L MK-H,
Fig. 14
Photo 2
Fig. 15
EMKS61A MK-LMK-H [30]
RUBBER CONTACT