Yamaha PortaTone PSR-A300 User manual

PSR-A300
1
Copyright (c) Yamaha Corporation. All rights reserved. PDF-K556 ’05.07
SERVICE MANUAL
HAMAMATSU, JAPAN
CONTENTS
SPECIFICATIONS .................................................................3
PANEL LAYOUT ..................................................................4
CIRCUIT BOARD LAYOUT & WIRING ................................5
BLOCK DIAGRAM ................................................................6
DISASSEMBLY PROCEDURE .............................................7
LSI PIN DESCRIPTION....................................................... 12
IC BLOCK DIAGRAM .........................................................14
CIRCUIT BOARDS ..............................................................15
TEST PROGRAM ...............................................................21
BACKUP & INITIALIZATION .............................................24
TRANSFERRING DATA BETWEEN
THE PSR-A300 and a COMPUTER ...................................25
MIDI IMPLEMENTATION CHART .....................................27
MIDI DATA FORMAT .........................................................28
PARTS LIST
OVERALL CIRCUIT DIAGRAM
PK 001738

2
PSR-A300
WARNING: CHEMICAL CONTENT NOTICE!
The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (Where
applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly
other entities) to cause cancer and/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 under-
stood 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 per-
sonal 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 certifi-
cation, 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.
Components having special characteristics are marked and must be replaced with parts having specification equal to those
originally installed.
WARNING
The panel settings and some other types of data will be lost if the power is turned off before they are saved.
Be sure to save data you want to keep to the internal Flash Memory before turning off the power.
Saved data may be lost due to malfunction or incorrect operation.Save the important data to your computer.
SAVING DATA
Saving and backing up your data

PSR-A300
3
SPECIFICATIONS
Keyboards
• 61 standard-size keys (C1-C6), withTouch Response
Display
• LCD display (backlit)
Setup
• STANDBY/ON
• MASTER VOLUME: MIN-MAX
Panel Controls
• [L]/[REC TRACK 2], [R]/[REC TRACK 1], [LISTEN &
LEARN], [TIMING], [WAITING], [A-B REPEAT]/[ACMP
ON/OFF], [REW]/[INTRO/ENDING/rit.], [FF]/[MAIN/AUTO
FILL], [TEMPO/TAP], [REC], [PAUSE]/[SYNC START],
[START/STOP], [SONG], [STYLE], [VOICE], [FUNCTION],
[PORTABLE GRAND], [SOUND EFFECT KIT], [REVERB
ON/OFF], [DEMO], [METRONOME ON/OFF], [SPLIT ON/
OFF], [DUAL ON/OFF], [HARMONY ON/OFF], [TOUCH
ON/OFF], number buttons [0]-[9], [+/ YES], [–/ NO],
[ORIENTAL SCALE SETTING] C-B, [MEMORY], [PITCH
BEND]
Voice
• 108 panel voices + 12 drum kits + 1 sound effect kit +
359 XGlite voices + 2 XGlite optional voices + 35
Oriental Voices + 6 Oriental Percussion Kits
• Polyphony: 32
•DUAL
• SPLIT
Style
• 135 preset Styles
• 1 flash Style
• Style Control:
ACMP ON/OFF, SYNC START, START/STOP,
INTRO/ENDING/rit., MAIN/AUTO FILL
• Fingering: Multi fingering
• Style Volume
Education Feature
• Chord Dictionary
• Lesson 1-3
Function
• Style Volume, SongVolume,Transpose,Tuning, Pitch Bend
Range, Split Point, Touch Sensitivity, Accompaniment
Tuning, Oriental Scales, Main voice (Volume, Octave,
Chorus Send Level), Dual voice (Voice, Volume, Octave,
Chorus Send Level), Split voice (Voice, Volume, Octave,
Chorus Send Level), Reverb Type, Reverb level, Chorus
Type, Panel Sustain, Harmony Type, Harmony Volume,
Style Registration, PC mode (PC1/PC2/Off), Local On/
Off, External Clock, Initial Setup Send, Time Signature,
Metronome Volume, Lesson Track (R), LessonTrack (L),
Demo Cancel
Effects
• Reverb: 9 types
• Chorus: 4 types
• Harmony: 26 types
Song
• 35 Preset Songs + 5 User Songs + Flash Memory
• Song Clear
• Song Volume
Recording
• Song
User Song: 5 Songs
Recording Tracks: 1, 2
Oriental Scale
• Setting: C-B
• Memory: 1-4
Pitch BendWheel
• Range: ±1 octave
MIDI
• Local On/Off
• Initial Setup Send
• External Clock
• PC mode
Auxiliary jacks
• PHONES/OUTPUT, DC IN 12V, MIDI IN/OUT, SUSTAIN
Amplifier
• 2.5W + 2.5W
Speakers
• 12cm x 2
Power Consumption
• 10W (When using PA-3C power adaptor)
Power Supply
• Adaptor: Yamaha PA-3B/3C AC power adaptor
• Batteries:Six “AA” size, LR6 or equivalent batteries
Dimensions (W x D x H)
• 945 x 370 x 128 mm
(37-1/4" x 14-5/8" x 5-1/16")
Weight
• 5.1kg (11 lbs. 4 oz.) (not including batteries)
Supplied Accessories
• Music Rest
• Owner’s Manual
Optional Accessories
• AC Power Adaptor: PA-3B/PA-3C
• USB-MIDI Interface: UX16
• Footswitch: FC4/FC5
• Keyboard Stand: L-2C/L-2L
• Headphones: HPE-150

4
PSR-A300
GrandPno
001
001
GrandPno
001
001
r
t
!9
y
@6 @7
!3
!2
@5
!1
u
!0
o
i
@0
@8
@9
@4
@3
@2
@1
Voice ListDisplay
#3#2#1#0
Style List
Song List
w
q
e
!4 !5 !7
!6 !8
Front Panel
Rear Panel
PANEL LAYOUT
Front Panel
q[STANDBY/ON] switch
w[MASTER VOLUME] control
When the lesson mode
eLESSON PART
[L] button
[R] button
When the recording mode
e[REC TRACK 2] button
[REC TRACK 1] button
r[LISTEN & LEARN] button
t[TIMING] button
y[WAITING] button
u[FUNCTION] button
i[SONG] button
o[STYLE] button
!0 [VOICE] button
!1 Number buttons [0]-[9], [+/YES], [–/NO]
!2 [DEMO] button
!3 [METRONOME ON/OFF] button
When the Song mode
!4 [A-B REPEAT] button
!5 [REW] button
!6 [FF] button
!9 [PAUSE] button
When the Style mode
!4 [ACMP ON/OFF] button
!5 [INTRO/ENDING/rit.] button
!6 [MAIN/AUTO FILL] button
!9 [SYNC START] button
!7 [TEMPO/TAP] button
!8 [REC] button
@0 [START/STOP] button
@1 [PORTABLE GRAND] button
@2 [SOUND EFFECT KIT] button
@3 [REVERB ON/OFF] button
@4 [SPLIT ON/OFF] button
@5 [DUAL ON/OFF] button
@6 [HARMONY ON/OFF] button
@7 [TOUCH ON/OFF] button
@8 [PITCH BEND] wheel
@9 [ORIENTAL SCALE] buttons
Rear Panel
#0 MIDI IN/OUT terminals
#1 SUSTAIN jack
#2 PHONES/OUTPUT jack
#3 DC IN 12V jack

PSR-A300
5
CIRCUIT BOARD LAYOUT &WIRING
61-L 61-H
2/3
DMLCD
1/3 3/3
!4
!0
u
r
oi
PNAM
PB
Upper case side
Lower case side
Speaker LSpeaker R
t
y
!1
!2 !3 !2 !5
!6
e
q
w
PNAM
PN2 PN1
PNAM
30
40
50
120
230
WA103
WA401
WA403
WA404
WA501
WA502
WA504
WA505
WA601
WH001
150c
*1
*1
*1
*2
*2
*2
*3
*3
*3
*3
*3
*3
*3
*3
*3
*3
*1
*4
*4
*4
*7
*7
*5
*4
*4
*5
*5
*4
*4
*4
*4
*4
*6
*4
*1
*1
*1
*1
*1
*1
*3
*2
*2
*1
*3
*1
*1
*1
*1
*1
*4
*4
*4
*6
*4
*4
*4
*5
*5
*4
*4
*4
*4
*4
*6
*4
q
w
e

r
t
y
u
i
o
!0
!1
!2
!3
!4
!5
!6
MK1
MK2
MK3
BATT
BL
AM
VOL
SPL
SPR
PN1
PN2
ORIPN1
ORIPN2
JACK
PB
61H-CN1
61H-CN2
61L-CN5
Battery terminal A
Battery terminal B
Back light assembly ±
PNAM1/3-CN103
PNAM1/3-CN401
PNAM1/3-CN403
PNAM2/3-CN404
PNAM2/3-CN501
PNAM1/3-CN503
PN1-CN201
PN2-CN301
PNAM2/3-CN601
PB-CN1
61H-CN3
DMLCD-CN831
DMLCD-CN832
DMLCD-CN833
PNAM1/3-CN101
PNAM1/3-CN102
DMLCD-CN131
PNAM3/3-CN402
Speaker-L ±
Speaker-R ±
DMLCD-CN531
PNAM2/3-CN502
PNAM2/3-CN504
PNAM2/3-CN505
DMLCD-CN631
DMLCD-CN901
61L-CN4
12P
5P
3P
3P
2P
11P L=170
5P L=120
2P L=280
2P L=220
16P L=100
10P L=340
11P L=500
9P L=300
9P L=70
3P L=540
12P L=210
WE138500
WE138700
WE138800
(WE15140)
(WE14140)
(WE13910)
(WE13900)
(WE14120)
(WE14130)
(WE14080)
(WE13970)
(WE16450)
(WE16460)
(WE14060)
(WE35540)
V8696200
*The parts with “( )” in “Part No.” are not available as spare parts.
*1: Installation
*2: Manual soldering
*3: Dip soldering
*4: Edge mark is adjusted to Pin 1 mark ( mark).
*5: Edge mark is adjusted to + mark ( + mark).
*6: Red wire is adjusted to Pin 1 mark ( mark).
*7: Battery terminal A (Black wire), Battery terminal B (Red wire)
Location Parts No. Destination Remarks
Connector
Assembly
No.
Caution: Be sure to attach the removed filament tape just as it was before removal.
++
–
–++
–
–

6 PSR-A300
BLOCK DIAGRAM
SUSTAINMIDI
OUTIN
JK602
JK601 JK603
PB0-PB4
PC0-5,PD0-5
PC0-5,PD0-5
PE3-6
PA0-PA4
PB0-PB3
PA6,PA7
PA0-PA5 PB5,PB6 PB5-PB7
PA5-PA7
SW MATRIX
SW501-525
MIDI I / F
IC601
TR601,602
SWL01
YMW767-VT
IC301
(128P)
MASK
64M
ROM
PROG/WAVE
IC201
(48P)
4M
FLASH
ROM
IC202
(48P)
4M
DRAM
IC203
(44P)
OR
74LV32A
16.9344MHz
Crystal SMD-49
F Tolerance±100PPM
RESET
+3.6V 50ms
LCD
DRIVER
24bit
DAC
AK4385ET
BUFFER/
LPF
SW MATRIX
SW526-537
POWER AMP
BA5417
IC401
(15P)
POWER SUPPLY
SELECTOR
REGULATOR
+5V
REGULATOR
+2.5V
REGULATOR
+3.3V
PNAM
PN1 PN2
2/3
PNAM 1/3
DMLCD
PNAM 3/3
CN404
(2P)
CN502
(10P)
CN504
(11P) CN505
(9P)
CN201
(11P) CN301
(9P)
CN501
(16P)
CN601
(9P)
CN631
(9P)
CN832
(5P)
IC831
(16P)
IC302
(5P)
IC204
(14P)
X301
IC832
(16P)
CN831
(12P)
CN1
(12P)
CN833
(7P)
CN901
(3P)
CN1
(3P)
fc=27KHz
Lch
Rch
+5V
+5V
CN531
(16P) CN503
(10P)
CN403
(2P)
CN101
(3P)
CN402
(5P)
VR401
CN401
(5P)
CN131
(11P)
CN103
(11P)
CN102
(2P)
JK101
SW101
JK401
(8P)
SPEAKER R
SPEAKER L
MASTER
VOLUME
PHONES /
OUTPUT
DC IN 12V
+2.5V
+2.5V
+3.3D
+3.3D
+3.3D
+3.3D
+5D
+3.3D
+5D
+5D
+5A1
+5A1
+5A2
+5A2
L
R
L
R
+B
IC101
(3P)
IC132 (3P)
IC431 (16P)
IC901 (6P)
IC432 (8P)
IC701 (80P)
IC131 (3P)
TR101,102
4Ω12cm
4Ω12cm
RXD0
TXD0
SCLK
PF0
IRQ0(Power SS)
PF0(Power Select)
IRQ0(Power SS)
PF0(Power Select)
SDO
SYSCK
BCLK
WCLK
PB0-PB7
PA0-PA7
PE1,PG1
PE1,PG1
PA0-PA7
RS
ENB
MD00-15
MA01-22
/UWR
/CAS
/LWR
/LUAS
/LCAS
MD00-15
MA01-09 MD00-15 MA01-18 MD00-15 MA01-22
BATTERY
1.5V x 6
+
AC adaptor
PA-3B/PA-3C
AA-size,SUM-3,R6 batteries
15,46,89,119
24,47,66,90,120
16
4
12
13
42,43
41
14
1,5,22
30,31
12 1237,47 37,47
5
67,68,123
70-76,78-86
91-103,105-108,110-114
34
117
40,42-44
48-55
116,122
57-64
35,36,
39,117
124-127 18-23,
25-30
1-4
14
5
8
2,3
6,5
11,12
9,10
1
711
12 5
3
4
28CA1-2000001123
–
8bit
ADC
ADCS7478AIMF
+3.3D
1
3
4,6
5
SW MATRIX
SW201~212
LED
LD201~212
TR201~203
TR501,502
TR301
SW MATRIX
SW301~305
LED
LD301~304
XI
XO
SDI
BCLK
WCLK
33
36,38-46
B01-B07
Keybord 61KEY
(16N)
TOUCH RESPONSE
PITCH BEND
B07-B11
CN5
(7P)
61H
CN4
(12P) (12P)
CN3
(5P)
CN2
61L
PB (C4~C6)
SW37-61
(C1~B3)
SW1-36
1
4
2
5
31
4
2
5
3
DECODER
74LV138A
1-3,61-3,516 16
13-15
7,9-15
DECODER
74LV138A
BACK LIGHT
LED: 2PCS(ORANGE)
LCD
DISPLAY
STANDBY/ON
LED
DRIVER
LED
DRIVER
LED
DRIVER
+3.3D

PSR-A300
7
1. Lower Case Assembly
(Time required: About 1 minute)
1-1 Remove the five (5) screws marked [240A], two (2)
screws marked [270A], and two (2) screws marked
[410]. The lower case assembly can then be
removed. (Fig. 1)
2. DMLCD Circuit Board
(Time required: About 3 minutes)
2-1 Remove the lower case assembly.(See procedure 1)
2-2 Remove the eight (8) screws marked [240B].The
DMLCD circuit board can then be removed.(Fig. 2)
∗When installing the DMLCD circuit board, tighten
the screws 1 through 8 in numerical order. (Fig.2)
∗If the DMLCD circuit board is replaced, execute the
“Factory Set” in the test program.
3. LCD (Time required: About 3 minutes)
3-1 Remove the lower case assembly.(See procedure 1)
3-2 Remove the DMLCD circuit board.(See procedure 2)
3-3 Remove the LCD holder and rubber connector.
3-4 Remove the back light assembly. (Fig. 4)
3-5 Remove the LCD. (Fig. 4)
∗When attaching the rubber connector, set the
conductive part to face inside.(Fig. 4)
[270A] [240A] [270A]
Speaker Grille LWheel Speaker Grille R
Knob (Master Volume)
[240A]
[240A]
[410][410]
Bottom view
Top view
Battery Lid AssemblyLower Case Keyboard Assembly
Lower Case Assembly
[240]: Bind Head Tapping Screw-B 3.0X12 MFZN2W3 (WE987400)
[270]: Bind Head Tapping Screw-B 3.0X30 MFZN2W3 (WF491000)
[410]: Bind Head Tapping Screw-B 3.0X20 MFZN2W3 (WF489300)
(Fig.1)
DISASSEMBLY PROCEDURE
Caution: Be sure to attach the removed filament tape just as it was before removal.

8
PSR-A300
4. PNAM Circuit Board (1/3, 2/3, 3/3)
4-1 Remove the lower case assembly.(See procedure 1)
4-2 PNAM Circuit Board 3/3
(Time required: About 2 minutes)
4-2-1 Remove the volume knob from the control panel
surface. (Fig. 1, 3)
4-2-2 Remove the three (3) screws marked [150A].The
PNAM circuit board 3/3 can then be removed.(Fig.2)
4-3 PNAM Circuit Board 1/3
(Time required: About 3 minutes)
4-3-1 Remove the PNAM circuit board 3/3.
(See procedure 4-2)
4-3-2 Remove the twelve (12) screws marked [150B].The
PNAM circuit board 1/3 can then be removed.(Fig.2)
4-4 PNAM circuit board (2/3)
(Time required: About 3 minutes)
4-4-1 Remove the nine (9) screws marked [150C]. The
PNAM circuit board 2/3 can then be removed.(Fig.2)
[30]
[30] [A] [A]
DMLCD
PNAM
2/3 PNAM 1/31/3
3/3
PNAM
[150C] [240B] [150B] [150A] [150B]
[240B][270B] [150B][150C][240C] Lower Case Ke
y
board Assembl
y
[240C]
Bottom view
3
1
4
7
5
8
6
2
[30]: Bind Head Tapping Screw-B 4.0X8 MFZN2W3 (WE974600)
[150]: Bind HeadTapping Screw-B 3.0X8 MFZN2W3 (WE774300)
[240]: Bind Head Tapping Screw-B 3.0X12 MFZN2W3 (WE987400)
[270]: Bind Head Tapping Screw-B 3.0X30 MFZN2W3 (WF491000)
(Fig.2)
Knob
(Master Volume)
(Fig.3)
Conductor side
Rubber Connector
Rubber Connector
DMLCD
LCD
Rubber Connector
Back Light Assembly
LCD Holder
(Fig.4)

PSR-A300
9
5. Speaker (Time required: About 3 minutes)
5-1 Remove the lower case assembly.(See procedure 1)
5-2 Remove the four (4) screws marked [30]. The
speaker can then be removed. (Fig. 2)
∗The right and left speakers can be removed in the
same way.
6. SP Grille (Time required: About 3 minutes)
6-1 Remove the lower case assembly.(See procedure 1)
6-2 Set the four (8) [A]s parallel to the groove in the upper
case assembly and remove the SP grille.(Fig.2)
∗The right and left SP grilles can be removed in the
same way.
7. Lower Case Keyboard Assembly
(Time required: About 2 minutes)
7-1 Remove the lower case assembly.(See procedure 1)
7-2 Remove the two (2) screws marked [240C] and
screw marked [270B]. The lower case keyboard
assembly can then be removed. (Fig. 2)
8. PN1 Circuit Board, PN2 Circuit Board
(Time required: About 3 minutes each)
8-1 Remove the lower case keyboard assembly.
(See procedure 7)
8-2 PN1 Circuit Board
8-2-1 Remove the eight (8) screws marked [150D].The
PN1 circuit board can then be removed. (Fig.5)
8-3 PN2 Circuit Board
8-3-1 Remove the five (5) screws marked [150E].The PN2
circuit board can then be removed.(Fig.5)
9. PB Circuit Board
(Time required: About 3 minutes)
9-1 Remove the lower case keyboard assembly.
(See procedure 7)
9-2 Remove the two (2) screws marked [150F].Then,
while sliding outward the wheel assembly connected
to the PB circuit board, pull the PB circuit board
upward. (Fig. 5)
∗The wheel assembly is not part of the PB circuit
board.When replacing the PB circuit board, remove
the wheel assembly and install it to the new circuit
board.
PN1
[150E]
Bottom view
DMLCD
PNAM
2/3 PNAM 1/31/3
[150D] [150D]
[150F]
PN2
3/3
PNAM
PB
Wheel Assembly
(Fig.5)
[150]: Bind Head Tapping Screw-B 3.0X8 MFZN2W3 (WE774300)

10
PSR-A300
10. Keyboard Assembly
10-1 Remove the lower case keyboard assembly.
(See procedure 7)
10-2 White and black keys for one octave unit are
integrated as a set. There are five sets in total.
Remove the four (4) screws marked [200A]. The
keyboard can then be removed. (Fig. 6) There are
two (2) hooks at the back of the black keys.(Photo.1)
Press the hook for the black key and lift a little, and
pull forward to remove the hook for the black key to
lift it.
10-3 To remove the white key C6, remove the screw
marked [200B], press the hook at the back to lift a
little, and pull forward to remove the hook to lift it.
(Fig. 6)
11. Rubber Contact
11-1 Remove the lower case keyboard assembly.
(See procedure 7)
11-2 Remove the keyboard corresponding to the rubber
contacts to be removed. (See procedure 10)
11-3 Remove the rubber contacts.(Photo.2)
12. Circuit Board 61L, Circuit Board 61H
12-1 Remove the lower case keyboard assembly.
(See procedure 7)
12-2 Circuit Board 61L
(Time required: About 6 minutes)
12-2-1 Remove the keyboards from C1 to B3.
(See procedure 10)
12-2-2 Remove the four (4) screws marked [180A], and
eight (8) screws marked [190A].The circuit board
61L can then be removed.(Fig. 7-1)
∗When installing the circuit board 61L, tighten the
screws 1 through 12 in numerical order.(Fig.7-2)
12-3 Circuit Board 61H
(Time required: About 5 minutes)
12-3-1 Remove the keyboards from C4 to C6.
(See procedure 10)
12-3-2 Remove the three (3) screws marked [180B], and
five (5) screws marked [190B].The circuit board 61H
can then be removed. (Fig. 7-1)
∗When installing the circuit board 61H, tighten the
screws 1 through 8 in numerical order.(Fig.7-2)
[200A]
C1 B2 B3 C4 C6
[200A] [200A] [200A] [200B][200A] [200A]
<Lower case keyboard assembly>
Top view
(Fig.6)
[200]: Bind HeadTapping Screw-P 3.0X20 MFZN2Y (EP600680)
(Photo.1) (Photo.2)
Hook
Rubber Contact

PSR-A300
11
Spring Terminal A Spring Terminal D Spring Terminal B
Hook
Hook
Spring Terminal C
Spring Terminal C Hook
Hook
13. How to Remove SpringTerminals
A SpringTerminal A, SpringTerminal B
13-1 Remove the lower case keyboard assembly.
(See procedure 7)
13-2 Remove the keyboards from C1 to B2.
(See procedure 10)
13-3 Remove the battery connector assembly soldered
to the spring terminal A and spring terminal B.
(Photo. 3)
13-4 Reverse the lower case keyboard assembly and
remove the battery lid assembly. (Fig. 1)
13-5 Lift the spring terminal A a little and slide it in the
upper right direction to remove it. (Fig.8)
13-6 Remove the hook for the spring terminal B to pull it
out from inside.(Fig. 8)
B SpringTerminal C, SpringTerminal D
13-1 Remove the battery lid assembly at the bottom side
of the lower case keyboard assembly. (Fig. 1)
13-2 Remove the hooks to pull out the spring terminal C
and spring terminal D. (Fig. 8, 9)
[180A]
[190A]
[180A] [180A]
[180A] [180B]
[180B] [180B]
[190A] [190B]
61L 61H
Rubber Contact
Rubber Contact
Rubber Contact
Rubber ContactRubber Contact
Top view
[180]: Bind Head Tapping Screw-B 3.0X8 MFZN2Y (EP600250)
[190]: Bind Head Tapping Screw-P SP 3.0X12 MFZNBL (VZ313100)
(Fig.7-1)
(Fig.7-2)
23 4 5 6 7 8 1 1 2345
910 11 126 7 8
61L 61H
Soldering
Spring Terminal A
Spring Terminal B
Battery Connector Assembly
(Fig.8)
(Photo.3) (Fig.9)

PSR-A300
12
■LSI PIN DESCRIPTION
PIN
NO. I/ONAME FUNCTION
YMW767-VTZ(X6055A00) CPU (Central Processing Unit)
PIN
NO. I/ONAME FUNCTION
DMLCD: IC301
1V
SS Ground
2
TESTN (SCMD) I TEST Pin
3 PLLBPN I PLL bypass
4 PLLV
DD Power supply
5 CIN Condenser connect
6 PLLV
SS Ground
7 TRSTN I
8 TMS I
9 TCK I JTAG
10 TDI I
11 TDO O
12 XI I Crystal oscillator
13 XO O
14 V
SS Ground
15 V
DD Power supply
16 ICN I Initial clear
17 ECSN I Chip select
18 EWRN/PD5 I Write enable
19 ERDN/PD4 I Read enable
20 EA3/PD3 I
21 EA2/PD2 I Address bus
22 EA1/PD1 I
23 EA0/PD0 I
24 IOV
DD Power supply
25 ED0/PC0 I/O
26 ED1/PC1 I/O
27 ED2/PC2 I/O
28 ED3/PC3 I/O Data bus /
29 ED4/PC4 I/O
30 ED5/PC5 I/O
31 ED6/PC6 I/O
32 ED7/PC7 I/O
33 V
SS Ground
34 IRQ0N/PH0 I Interrupt request
35 TxD0 O Serial port 0
36 RxD0 I
37 TxD1/PG2 O Serial port 1 /
38 RxD1/PH1 I
39 SCLK1/PH2 I EXT Clock /
40 SDO O Serial data
41 SDI/PH3 I Serial data /
42 BCLK O Bit clock
43 WCLK/SYO O Word clock
44 SYSCLK/PG3 O System clock
45 V
SS Ground
46 V
DD
Power supply
47 IOV
DD
48 PA0 I/O
49 PA1 I/O
50 PA2 I/O
51 PA3 I/O Parallel port A
52 PA4 I/O
53 PA5 I/O
54 PA6 I/O
55 PA7 I/O
56 V
SS Ground
57 PB0 I/O
58 PB1 I/O
59 PB2 I/O
60 PB3 I/O Parallel port B
61 PB4 I/O
62 PB5 I/O
63 PB6 I/O
64 PB7/SYI I/O Parallel port B /
65 V
SS Ground
66 IOV
DD Power supply
67
LBN/LWRN/PF6 O Low byte enable
68
UBN/UWRN/PF7 O Upper byte enable
69 RDN/PF4 O Read enable
70 MD00 I/O
71 MD08 I/O
72 MD01 I/O
73 MD09 I/O Memory data bus
74 MD02 I/O
75 MD10 I/O
76 MD03 I/O
77 V
SS Ground
78 MD11 I/O
79 MD04 I/O
80 MD12 I/O
81 MD05 I/O
82 MD13 I/O Memory data bus
83 MD06 I/O
84 MD14 I/O
85 MD07 I/O
86 MD15 I/O
87 WRN/PF5 O
88 V
SS Ground
89 V
DD Power supply
90 IOV
DD Power supply
91 MA17 O
92 MA16 O
93 MA15 O
94 MA14 O
95 MA13 O
96 MA12 O
97 MA11 O Memory address bus
98 MA10 O
99 MA09 O
100 MA08 O
101 MA07 O
102 MA06 O
103 MA05 O
104 V
SS Ground
105 MA04 O
106 MA03 O Memory address bus
107 MA02 O
108 MA01 O
109 CS0N/PG0 O Chip select /
110 MA18 O Memory address bus
111 MA19 O
112 MA21/PF1 O Memory address bus
113 MA22/PF2 O
114 MA20 O Memory address bus
115 MA23/PF3 O Memory address bus
116 CSIN/PG1 O Chip select /
117 MA00/PF0 O Memory address bus
118 V
SS Ground
119 V
DD Power supply
120 IOV
DD Power supply
121 CS2N/PE0 O Chip select /
122 CS3N/PE1 O Chip select /
123
CS4N/CASN/PE2 O Chip select /
124 CS5N/PE3 O Chip select /
125 CS50RDN/PE4 O Chip select /
126 CS51WRN/PE5 O Chip select /
127 CS52WRN/PE6 O Chip select /
128
CS53WRN/RASN/PE7 O Chip select /

PSR-A300
13
PIN
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
I
O
O
O
O
O
I
I
I
I/O
I/O
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
Vss
OSC1
OSC2
V1
V2
V3
V4
V5
CLK1
CLK2
Vdd
M
D
RS
R/W
E
DB0
DB1
NAME
Segment signal output for LCD
driving
Ground
Oscillator
Oscillator
Power supply
Data latch clock
Data shift clock
Power supply (+5 V)
Altamated signal for LCD driver outout
Display data interface
Read/write
Enable
Data interface
Data interface
FUNCTION PIN
NO.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
DB2
DB3
DB4
DB5
DB6
DB7
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
S40
S39
S38
S37
S36
S35
S34
S33
S32
S31
S30
S29
S28
S27
S26
S25
S24
S23
NAME
Data interface
Common signal output for LCD
driving
Segment signal output for LCD
driving
FUNCTION
NT3881EFG-01 (X6247A00) LCD DRIVER
ML9040A-B01GAZ03A(XZ987A00) LCD DRIVER
NT3881DF-01 (X3148A00) LCD DRIVER
DMLCD: IC701

PSR-A300
14
■IC BLOCK DIAGRAM
HD74LV32AFPEL (IS003200)
Quad 2 Input OR
DMLCD: IC204
1
2
3
1A
1Y
4 2A
5 2B
6 2Y
7 GND
1B
14
13
12
Vcc
4A
11 4Y
10 3B
9 3A
8 3Y
4B
AK4385ET (X6040A00)
D/A Converter
DMLCD: IC431
1
2
3
4
5
6
7
16
15
14
13
12
11
8
7
8
10
9
CSN
CCLK
CCLK
CDTI
CDTI
LRCK
LRCK
BICK
BICK
SDTI
SDTI
PDN
PDN
VDD
MCLK
MCLK
VSS
DZFL
DZFR
AOUTL+
AOUTL-
AOUTR+
AOUTR-
VDD
VSS
DZFL
DZFR
AOUTL+
AOUTL-
AOUTR+
AOUTR-
∆Σ
Modulator
∆Σ
Modulator
µP
Interface
De-emphasis
Control Clock
Divider
Audio
Data
Interface
8X
Interpolator
8X
Interpolator
SCF
SCF
CSN
NJM4580E (X2331A00)
Dual Operational Amplifier
DMLCD: IC432
1
2
3
4-V
8
7
6
5
A Output +V
A+INPUT
V
-
V
+
B Output
B
- INPUT
B +INPUT
A
- INPUT
+-
+-
SN74LV138ANSR (ISO013810)
DECODER
DMLCD: IC831,832
1
2
3
4
5
6
7
A
A
Select
Enable
Output
Output
B
B
C
C
G2A
G2A
G2B
G2B
G1
G1
Y7
Y7 Y5
Y4
Y3
Y2
Y1
Y0
Y6
16
15
14
13
12
11
10
Vcc
YO
Y1
Y2
Y3
Y4
Y5
8
GND
9
Y6
ADCS7478AIMF (X5892A00)
A/D Converter
DMLCD: IC901
1
2
3
6
5
4
V DD
V IN
T/H
CONTROL
LOGIC
SUCCESSIVE
APPROXIMATION
ADC
SDATA
SCLK
GND
CS

PSR-A300
15
to PNAM2/3-CN502
to BATTERY
to SPEAKER L
to DMLCD-CN131
to PNAM3/3-CN402
to LCD BACK LIGHT
PHONES/
OUTPUT
DC IN 12V
LISTEN&LEARN
TIMING
WATING
START/STOP
SYNC
START
CLEAR
TEMPO/TAP
LESSON
PART R
LESSON
PART L
STANDBY
/ON
FFREWA-B REPEAT
PNAM1/3 Circuit Board
2NA-WE00540 2
■CIRCUIT BOARDS
DMLCD Circuit Board (X5910C0) ..........................................................17
PB Circuit Board (X5067A0)...................................................................20
PN1 Circuit Board (X6095A0).................................................................19
PN2 Circuit Board (X6095A0).................................................................20
PNAM 1/3 Circuit Board (X5911C0) ......................................................15
PNAM 2/3 Circuit Board (X5911C0) ......................................................16
PNAM 3/3 Circuit Board (X5911C0) ......................................................16
61H Circuit Board (X2335C0).................................................................18
61L Circuit Board (X2336B0) .................................................................18
Note: See parts list for details of circuit board component parts.
Component side

PSR-A300
16
to PN2-CN301 to PN1-CN201to PNAM1/3-CN503
PORTABLE
GRAND
VOICE
STYLE
SONG FUNCTION
SOUND
EFFECT KIT PEVERB ON/OFF SPLIT
ON/OFF DUAL ON/OFF HARMONY ON/OFF TOUCH ON/OFF
METRONOME
ON/OFF
DEMO
-
7
4
1
0
8
5
2
+
9
6
3
SUSTAIN MIDI
OUT IN
to DMLCD-CN631
to DMLCD-CN531
PNAM2/3 Circuit Board
to PNAM1/3-CN401
MASTER VOLUME
PNAM3/3 Circuit Board
PNAM2/3: 2NA-WE00540 2
PNAM3/3: 2NA-WE00540 2
Component side
Component side

PSR-A300
17
to PNAM2/3-CN601
to PNAM2/3-CN501
to 61H-CN2 to 61H-CN1 to 61L-CN5
to PNAM1/3-CN103
to PB-CN1
DMLCD Circuit Board
Component side
Pattern side
2NA-WE00520 1

PSR-A300
18
B
B’
to DMLCD-CN833 to 61H-CN3
B
B’
to DMLCD-CN831 to 61L-CN4 to DMLCD-CN832
A
A’
A
A’
Component side
Component side
61H: 2NAKB-V869540
61L: 2NAKB-V869520
61H Circuit Board
61L Circuit Board

PSR-A300
19
ORIENTAL SCALE (SETTING)
C
C’
D
D’
C
C’
to PNAM2/3-CN504
D
D’
PN1 Circuit Board
Component side
Pattern side
2NA-WE16730 1

PSR-A300
20
to PNAM2/3-CN505
ORIENTAL SCALE (MEMORY)
1234
PN2 Circuit Board
Component side
Pattern side
PB Circuit Board
Component side
PN2:2NA-WE16730 1
PB: 2NA-WC36570 1
to DMLCD-CN901
PITCH BEND