Portable Grand DGX-620 User manual

SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. PDF ’06.03
/
PK 001760
CONTENTS
SPECIFICATIONS .................................................................... 3
PANEL LAYOUT........................................................................ 4
CIRCUIT BOARD LAYOUT & WIRING ..................................... 6
BLOCK DIAGRAM .................................................................... 8
DISASSEMBLY PROCEDURE ................................................. 9
LSI PIN DESCRIPTION .......................................................... 20
IC BLOCK DIAGRAM .............................................................. 23
CIRCUIT BOARDS ................................................................. 24
TEST PROGRAM ................................................................... 33
INITIALIZATION ...................................................................... 37
USER DATA BACKUP ............................................................. 38
MIDI IMPLEMENTATION CHART ........................................... 42
MIDI DATA FORMAT ............................................................... 43
PA RTS LIST
OVERALL CIRCUIT DIAGRAM
DGX-620
YPG-625

2
DGX-620/YPG-625
SAVING DATA
Saving and backing up your data
The panel settings and some other types of data are not retained in memory when you turn off the power to the
instrument. Save data you want to keep to the Registration Memory.
Saved data may be lost due to malfunction or incorrect operation.
Save important data to a USB storage device/or other external device such as a computer.
Be sure to
p
erform it
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 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 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 believed 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
Backing up the USB storage device/external media
To protect against data loss through media damage, we recommend that you save your important data onto two
USB storage devices/external media.
Be sure to
p
erform it

3
DGX-620/YPG-625
■ SPECIFICATIONS
Keyboards
• 88 Graded Hammer Standard keys (A-1–C7), with Touch
Response.
Display
• 320 x 240 dots LCD display (backlit)
Setup
• STANDBY/ON
• MASTER VOLUME: MIN–MAX
• LCD CONTRAST
Panel Controls
• SONG, VOICE, STYLE, EASY SONG ARRANGER,
P.A.T. ON/OFF, LESSON L, LESSON R, LESSON START,
METRONOME ON/OFF, PORTABLE GRAND, DEMO,
FUNCTION, MUSIC DATABASE, HARMONY ON/OFF,
DUAL ON/OFF, SPLIT ON/OFF, TEMPO/TAP, [0]–[9], [+],
[-], CATEGORY, Dial, REPEAT & LEARN (ACMP ON/OFF),
A-B REPEAT (INTRO/ENDING/rit.), PAUSE (SYNC START),
START/STOP, REW (MAIN/AUTO FILL), FF (SYNC STOP),
REGIST MEMORY ([MEMORY/BANK], [1], [2]),
SONG MEMORY (REC, [1]–[5], [A]), File Control [MENU],
File Control [EXECUTE], [EXIT], [LYRICS], [SCORE],
[CHORD FINGERING]
Realtime Control
• Pitch Bend Wheel
Voice
• 127 panel voices + 12 drum/SFX kits + 361 XGlite voices
• Polyphony: 32
• DUAL
• SPLIT
Style
• 150 Preset Styles + 1 User Style File
• Style Control: ACMP ON/OFF, SYNC STOP, SYNC START,
START/STOP, INTRO/ENDING/rit.,
MAIN/AUTO FILL
• Fingering: Multi Finger, Full Keyboard
• Style Volume
Music Database
• 267
Education Feature
• Dictionary
• Lesson 1–3, Repeat & Learn
Registration Memory
•8banks x 2 types
Function
• VOLUME: Style Volume, Song Volume
• OVERALL: Tuning, Transpose, Split Point, Touch Sensitiv-
ity, Pitch Bend Range, Chord Fingering
• MAIN VOICE: Volume, Octave, Pan, Reverb Level,
Chorus Level
• DUAL VOICE: Volume, Octave, Pan, Reverb Level,
Chorus Level
• SPLIT VOICE: Volume, Octave, Pan, Reverb Level,
Chorus Level
• EFFECT: Reverb Type, Chorus Type, Master EQ Type,
Sustain
• HARMONY: Harmony Type, Harmony Volume
• Performance assistant technology:
Performance assistant technology Type
• PC: PC Mode
• MIDI: Local On/Off, External Clock, Initial Send,
Keyboard Out, Style Out, Song Out
• METRONOME: Time Signature Numerator, Time Signature
Denominator, Metronome Volume
• SCORE: Quantize
• LESSON: Lesson Track (R), Lesson Track (L), Grade
• UTILITY: Demo Cancel, Language
Effects
• Reverb: 9 types
• Chorus: 4 types
• Harmony: 26 types
Song
•30 Preset Songs + 5 User Songs + Accessory CD-ROM Songs (70)
• Song Clear, Track Clear
• Song Volume
• Song Control: REPEAT & LEARN, A-B REPEAT, PAUSE,
REW, FF, START/STOP
Performance assistant technology
• Chord, Chord/Free, Melody, Chord/Melody
Recording
• Song
User Song: 5 Songs
Recording Tracks: 1, 2, 3, 4, 5, STYLE
MIDI
• Local On/Off • Initial Send • External Clock
• Keyboard Out • Style Out • Song Out
Auxiliary jacks
• PHONES/OUTPUT, DC IN 12V, USB TO HOST,
USB TO DEVICE, SUSTAIN
Ampli er
• 6W + 6W
Speakers
• 12cm x 2 + 3cm x 2
Power Consumption
• 22W
Power Supply
• Adaptor: Yamaha PA-5D AC power adaptor
Dimensions (W x D x H)
•
•
1,398 x 457 x 153 mm (55-1/16" x 18" x 6")
with keyboard stand:
1,405 x 485 x 773 mm (55-1/3" x 19-1/8" x 30-3/8")
Weight
•
•
18.0kg (39 lbs. 11 oz.)
with keyboard stand:
25.5kg (56 lbs. 3 oz.)
Supplied Accessories
•Music Rest • Accessory CD-ROM
•Keyboard Stand • Owner’s Manual • Footswitch FC5
•AC Power adaptor (May not be included depending on your par-
ticular area.)
Optional Accessories
• Headphones: HPE-150

4
DGX-620/YPG-625
q
w
e
r t y
#4
u i o
!0
!1 !2
!6 !7 !8 !9
!3
!4 !5
• Front Panel
q[STANDBY/ON] switch
w[MASTER VOLUME control
eFILE CONTROL [MENU], [EXECUTE] button
r[LYRICS] button
t[SCORE] button
y[CHORD FINGERING] button
u[P.A.T. ON/OFF] button
i[MUSIC DATABASE] button
o
!0
!1
!2
!3
[FUNCTION] button
LESSON [L],[R], [START] buttons
[METRONOME ON/OFF] button
[TEMPO/TAP] button
SONG MEMORY [REC], [1]-[5], [A] buttons
!4 [REPEAT & LEARN]/ [ACMP ON/OFF] button
!5 [A-B REPEAT]/[INTRO/ENDING/rit.] button
!6 [REW]/[MAIN/AUTO FULL] button
!7 [FF]/[SYNC STOP] button
!8 [PAUSE]/[SYNC START] button
!9 [START/STOP] button
@0 [SONG] button
@1 [EASY SONG] ARRANGER] button
@2 [STYLE] button
@3 [VOICE] button
• Front Panel
■ PANEL LAYOUT

5
DGX-620/YPG-625
@3
@4
@5
@6
@7
@8
@9
#0 #1 #2 #3
#5 #6 #7 #8 #9
@0
@1
@2
Rear Panel
• Rear Panel
@4 Dial
@5 CATEGORY[ ] and [ ] buttons
@6 Number buttons [0]–[9],[+] and [-] buttons
@7 [DEMO] button
@8 [EXIT] button
@9 REGIST MEMORY [MEMORY/BANK], [1], [2] buttons
#0 [PORTABLE GRAND] button
#1 [SPLIT ON/OFF] button
#2 [DUAL ON/OFF] button
#3 [HARMONY ON/OFF] button
#4 [PITCH BEND] wheel
#5 CONTRAST knob
#6 USB TO DEVICE, TO HOST terminals
#7 SUSTAIN jack
#8 PHONES/OUTPUT jack
#9 DC IN 12V jack

6
DGX-620/YPG-625
■CIRCUIT BOARDS LAYOUT & WIRING
• Keyboard assembly
< Top view >
GHL88L GHL88M GHL88H
5
PB
PSW DJACK
MVR PNL AM LCD unit
Speaker
(Tweeter (L)) Speaker
(Tweeter (R))
Speaker
(Woofer (R))
Speaker
(Woofer (L))
DM ENC PNR
TW (R)
TW (L)
• Upper case
• Lower case
15
15
10
13
12
791
36
811
24
14
5
Keyboard assembly
< Bottom view >
MKO

7
DGX-620/YPG-625
-- -- Flexible flat cable
Flexible flat cable
Flexible flat cable
Flexible flat cable
Flexible flat cable
Flexible flat cable
DM-CN201 *1 *4 LCD *3 *4 14P
240 WG317700
WG317600
WG317800
WG318100
WG317900
DM-CN301 *1 *4 DJACK-CN301 *1 *4 14P
230 DM-CN601 *1 *4 PNL-CN01 *1 *4 12P
250 DM-CN602 *1 *4 PNR-CN02 *1 *4 15P
2 DM-CN701 *1 *4
GHL88M-CN02 *1 *4 27P
260 DM-CN901 *1 *4 AM-CN104 *1 *4 19P
WH501 (WG45930) AM-CN101 *1 *5 PSW-CN501 *2 *5 4P
290 WB092100 AM-CN102 *1 *5 LCD *3 *6 2P
WH401 (WG46060) AM-CN103 *1 *5 PB-CN401 *2 *5 3P
WH201 (WG46040) TWL AM-CN201 *2 *5 TW(L) *3 *6 2P
WH202 (WG46050) TWR
PSW
AM-CN202 *2 *5 TW(R) *3 *6 2P
30 (WG45880) SP2 AM-CN203 *1 *9 Speaker Lch
Speaker Rch
*3
*3
*9
*10 4P
WH601 (WG46070) MVR
PB
AM-CN204 *1 *5 MVR-CN601 *2 *5 5P
WH901 (WB09270)
X0159A00
ENC PNR-CN03 *1 *5 ENC-CN901 *2 *5 3P
BL
Caution: Be sure to attach the removed filament tape just as it was before removal.
Location Part No. Connector Assembly Destination Remarks
q
w
e
r
t
y
u
i
o
!0
!1
!2
!3
!4
-- -- -- Speaker *11 -- TW *3 *10 2P
!5
No.
* The parts with "( )" in "Part No." are not available as spare parts.
* 1 : Installation
* 2 : Dip soldering
* 3 : Manual soldering
* 4 : The conductor of a cable and the point of contact of a connector are untited.
* 5 : Edge mark is adjusted to Pin 1 (왕) side.
* 6 : Edge mark is connected to + side.
* 7 : Edge mark is connected to + terminal.
* 8 : White wire is adjusted to Pin 1 (왕) side.
* 9 : White wire is connected to + terminal.
* 10 : Red wire is connected to + terminal.
* 11 : Connected

8
DGX-620/YPG-625
BLOCK DIAGRAM
28CA1-2001000277
Keyboard(GHL)
88KEY
with touch response
B[1-15]
N[11-16]
N[21-26]
GHL88L GHL88M GHL88H
(C#5~C7)
(A-1~C2) (C#2~C5)
DJACK
ENC
PNR
PNL
MVR
DM
TW
AM
PSW
TW
(R) (L)
ROTARY
ENCODER
TO HOST
TO DEVICE
USB
SUSTAIN
CONTRAST
DATA ENTRY
BACK LIGHT
STANDBY/ON
SW501
JK201
11
14
Vcc
8
6
1
R
L
IC201(14P)
IC102(3P)
IC101(3P)
PHONES/
OUTPUT
POWER AMP
6W X 2
LA4625
LCD
DISPLAY
320 X 240
STN
L
TWEETER
3cm
TWEETER
3cm
R
WOOFER
12cm
4
WOOFER
12cm
4
JK301 JK303 JK302
VR301
6MHz
X301
USB
CONTROLLER
DC/DC
CONVERTER
+5D
+5D
+21~27V
+29V
CPU
IC701 (44P)
5MHz
SW
MATRIX
LED
SW
MATRIX
LED LED
DRIVER
16.9344
MHz
RESET
3.6V
MA/MD
IC101
(128P)
RXD1 TXD1 SD0
PD1,2
ICN
PD3 *A
*A:24,47,66,90,120
*B:15,46,89,119
*B
+3.3D
IC301
(64P)
ISP1161A
IC202
(8P)
+2.5D
+5D
128M
ROM
PROG
/WAVE
8M
FLASH
ROM
16M
DRAM
DAC
24bit
ADC
8bit
PCM1742K
LPF
MASTER
VOLUME
LCDC
+3.3V
REG.
+2.5V
REG.
+5V
REG.
D101
FZ001
+5D
+3.3D
+5A
+3.3D
+5A
+2.5D
CS0:128M ROM
CS1:LCDC
CS3:8M FLASH
CS5:USBC
+5D
+5A
IC201
(64P)
S1D13700F00A
IC902 (3P)
IC901 (3P)
PB0-7
IN[0-6]
IN[0-6]
PA[4-7]
PA[0-3]
TA601-604
IC102 (5P)
SYSCLK, BCLK, WCLK
BCLK, WCLK
MA0-23
MD0-15
XD0-3
YD,LP
XCSL,WF
PA0-7
IC802(48P)
IC401(16P)
IC501(10P)
IC402(8P)
VR601
IC803(48P) IC804(50P)
PITCH BEND
CN01(12P)
CN02(15P)
CN602(15P)
CN601(12P)
CN2(27P)
CN1(17P)
CN1(17P)
CN3(17P) CN1(17P)
CN03(3P)
CN901(3P)
uPD789022GB
CR701
EC901
22
27
R704
18,3814,15
38
2
7
14
2
8
41
37
38
SDI
8
2
6
16
20
4
5
+3.3D
+3.3D
7,12,22,25
32,40,48,55
+3.3D
37
+3.3D
1,6
25
+3.3D
56,58
37 40
X101
CN301(14P) CN201(14P)
CN301(14P)
CN102(2P)
CN103(3P)
CN204(5P)
CN601(5P)
CN202(2P) CN201
(2P)
CN203(4P)
CN101(4P)
CN501(4P)
CN901(19P) CN104(19P)
DC IN 12V
JK101
YMW767-V
12,13
CPU
1
7
L
R
PITCH BEND
VR401
PB
+5V
3
3
1
1
2
2
REG.
CN401(3P)
PA-5D
(AC Adaptor)
CN701(27P)
■

9
DGX-620/YPG-625
■DISASSEMBLY PROCEDURE
1. Lower Case Assembly
(Time required: About 9 minutes)
1-1 Remove the twenty (20) screws marked [510A].
The bottom boards L and R can then be removed.
(Fig.2)
1-2 Remove the thirty six (36) screws marked [500] and
the forty six (46) screws marked [510B].
The lower case assembly can then be removed. (Fig.3)
Caution: 1) Flat cable’s contacts are visible from the back.
Pay attention not to insert and install the cable to the connector inversely. (Fig.1)
2) Be sure to attach the removed filament tape just as it was before removal.
[510]: Bind Head Tapping Screw-B 4.0X16 MFZN2W3 (WF154100)
(Fig.2)
[500]: Bind Head Tapping Screw-B 4.0X12 MFZN2W3 (WE981200)
[510]: Bind Head Tapping Screw-B 4.0X16 MFZN2W3 (WF154100)
(Fig.3)
Front Side (Printed Side) Back side
(Fig.1)
[510A] [510A]
Bottom Board (L) Bottom Board (R)
<Bottom View>
<Bottom View>
[500] [500] [500]
[500]
[500][500]
[500]
[500]
[500] [500] [510B][510B]

10
DGX-620/YPG-625
[480B]
Speaker
(Tweeter(R))
Speaker
(Tweeter(L))
[480A] [480D] [480E] [480B]
[480C]
Wheel Assembly
PB
DM AM
(R)
TW
(L)
TW
PSW
Upper Case
[480G]
DJACK
2. DM Circuit Board
(Time required: About 10 minutes)
2-1 Remove the lower case assembly. (See procedure 1.)
2-2 Remove the four (4) screws marked [480A].
The DM circuit board can then be removed. (Fig.4)
3. TW Circuit Board, Speaker (Tweeter)
(Time required: About 9 minutes)
3-1 Remove the lower case assembly. (See procedure 1.)
3-2 Remove the two (2) screws marked [480B]. The TW
circuit board and speaker (tweeter) can then be removed.
(Fig.4)
*The left and right speakers (tweeters) can be removed in
the same way.
4. PB Circuit Board, Wheel Assembly
(Time required: About 9 minutes)
4-1 Remove the lower case assembly. (See procedure 1.)
4-2 Remove the two (2) screws marked [480C]. The PB
circuit board and the wheel assembly can then be
removed. (Fig.4)
*Make sure to mount the wheel assembly on the volume
shaft of the PB circuit board by firmly inserting it into the
shaft.
5. AM Circuit Board
(Time required: About 10 minutes)
5-1 Remove the lower case assembly. (See procedure 1.)
5-2 Remove the seven (7) screws marked [480D]. The AM
circuit board can then be removed. (Fig.4)
6. PSW Circuit Board
(Time required: About 9 minutes)
6-1 Remove the lower case assembly. (See procedure 1.)
6-2 Remove the two (2) screws marked [480E].
The PSW circuit board can then be removed. (Fig.4)
7. DJACK Circuit Board
(Time required: About 10 minutes)
7-1 Remove the lower case assembly. (See procedure 1.)
7-2 Remove the three (3) screws marked [480G].
The DJACK circuit board can then be removed. (Fig.4)
(Fig.4)
[480]: Bind Head Tapping Screw-B 3.0X8 MFZN2W3 (WE774300)

11
DGX-620/YPG-625
8. ENC Circuit Board
(Time required: About 10 minutes)
8-1 Remove the lower case assembly. (See procedure 1.)
8-2 Remove the encoder knob from the control panel. (Fig.5)
8-3 Remove the four (4) screws marked [480H]. The ENC
circuit board can then be removed. (Fig.6)
9. PNR Circuit Board
(Time required: About 11 minutes)
9-1 Remove the lower case assembly. (See procedure 1.)
9-2 Remove the twelve (12) screws marked [480I]. The PNR
circuit board can then be removed. (Fig.6)
10. MVR Circuit Board
(Time required: About 10 minutes)
10-1 Remove the lower case assembly. (See procedure 1.)
10-2 Remove the volume knob from the control panel. (Fig.7)
10-3 Remove the three (3) screws marked [480K]. The MVR
circuit board can then be removed. (Fig.6)
11. PNL Circuit Board
(Time required: About 12 minutes)
11-1 Remove the lower case assembly. (See procedure 1.)
11-2 Remove the AM circuit board. (See procedure 5.)
11-3 Remove the ten (10) screws marked [480F]. The PNL
circuit board can then be removed. (Fig.6)
(Fig.5)
Encoder knob
[480H]
[480I]
[480K]
PNR ENC MVR
Upper Case
PNL
LCD Unit
[480J] [480F]
(Fig.6)
[480]: Bind Head Tapping Screw-B 3.0X8 MFZN2W3 (WE774300)
Volume Knob
Cloth
(Fig.7)

12
DGX-620/YPG-625
13. Speaker (Woofer)
(Time required: About 10 minutes)
13-1 Remove the lower case assembly. (See procedure 1.)
13-2 Remove the four (4) screws marked [40]. The speaker
(woofer) can then be removed. (Fig.8)
*The left and right speakers (woofers) can be removed
in the same way.
12. LCD Unit
(Time required: About 11 minutes)
12-1 Remove the lower case assembly. (See procedure 1.)
12-2 Remove the DM circuit board. (See procedure 2.)
12-2 Remove the four (4) screws marked [480J].
The LCD unit can then be removed. (Fig.6)
14. Keyboard Assembly
(Time required: About 13 minutes)
14-1 Remove the lower case assembly. (See procedure 1.)
14-2 Remove the six (6) screws marked [480L], the twelve (12)
screws marked [480M] and the eight (8) screws marked
[560].
[480L] [480L]
[560]
[560][560]
[480M] [480M] [480M]
Upper Case
Keyboard Assembly
(Fig.9)
[480]: Bind Head Tapping Screw-B 3.0X8 MFZN2W3 (WE774300)
[560]: Bind Head Tapping Screw-B 3.0X20 MFZN2W3 (WF489300)
(Fig.8)
[40]: Bind Head Tapping Screw-B 4.0X12 MFZN2W3 (WE981200)
The keyboard assembly can then be removed from the
upper case assembly. (Fig.9)
[40] Speaker
(Woofer(L))
[40]
Speaker
(Woofer(R))
Lower Case

13
DGX-620/YPG-625
15. Disassembling the Keyboard Assembly
15-1 White key assembly and black key assembly
Remove the four (4) screws marked [270A] fixing the
black and white key assembly for one octave (C-B).
To remove the back of the black and white key assembly
of each octave, while pushing the end lug of white keys
rearward and lifting the back of keys, slide the black and
white key assembly towards you. (Fig.10, Fig.11)
Grease
Rubber contact
GHL88M
End lug of white key
[270B]
A-1 Key
B-1 Key
One octave
(C0-B0)
[270A] [270A] [270A] [270A] [270A] [270A] [270A] [270C]
C7 Key
One octave
(C1-B1)
One octave
(C2-B2)
One octave
(C3-B3)
One octave
(C4-B4)
One octave
(C5-B5)
One octave
(C6-B6)
<Top view>
(Fig.11)
15-2 When removing white keys numbered as A-1 and B-1
key and black key, remove two (2) screws marked
[270B] and then lift the back of the keys and slide the
black and white keys towards you. (Fig.10)
15-3 When removing the C7 key, remove a screw marked
[270C] and then lift the back of C7 key and slide it
towards you. (Fig.10)
Note: When removing white key assembly and black key
assembly, be careful not to allow grease to attach to the
circuit board and rubber contacts, etc. (Fig.11)
(Fig.10)
[270]: Bind Head Tapping Screw-P 3.0X16 MFZN2W3 (WE973000)

14
DGX-620/YPG-625
Actuate rubber
Remove in this way.
15-4 Actuate Rubber
Remove the actuate rubber. (Fig.12)
15-5 Rubber Contact
Remove the black and white key assembly for two octaves
related to the subject rubber contact. The rubber contact
can then be removed. (Fig.13, Fig.14)
*Note that the rubber contact has a specific installation
direction.
*One rubber contact fits for C#-C (for C-B keys).
[260A]
Rubber contact
[260B] [260C]
Rubber contact
Rubber contact
Rubber contact
Rubber contact Rubber contact
Rubber contact Rubber contact
GHL88H
GHL88MGHL88L
<Top View>
One octave
(C-B)
One octave
(C-B)
One octave
(C#-C)
Rubber contact Key
To remove the rubber contact for one octave, keys for 2 octaves need to be removed.
(Fig.13)
[260]: Bind Head Tapping Screw-P 2.6X8 MFZN2W3 (WF267300)
(Fig.12)
(Fig.14)

15
DGX-620/YPG-625
15-6 GHL88L Circuit Board
Remove the black and white key assembly (A1-B2).
(See procedure 15-1.)
Remove the six (6) screws marked [260A]. The GHL88L
circuit board can then be removed. (Fig.13)
GHL88M
FFC cable
Frame
FFC cable
Filament tape
CN2 (27P)
GHL88M
CN2
(27P)
Through hole
Filament tape
<Top view> <Side view>
Keyboard assembly
(Fig.15)
15-7 GHL88M Circuit Board
Remove the black and white key assembly (C1-B5).
(See procedure 15-1.)
Remove the seven (7) screws marked [260B]. The
GHL88M circuit board can then be removed. (Fig.13)
Detach the filament tape and disconnect the FFC cable.
(Fig.15)

16
DGX-620/YPG-625
Frame
Hammer, white key
Hammer, black key
Bearing claw
Hammer axis
Bottom side
Push
<Rear view>
Hammer, W1 (white key)
Hammer, B1 (black key)
Bearing claw
Bearing section
15-8 GHL88H Circuit Board
Remove the black and white key assembly (C5-C7).
(See procedure 15-1.)
Remove the five (5) screws marked [260C]. The GHL88H
circuit board can then be removed. (Fig.13)
15-9 Hammer (White Key), (Black Key)
Remove the black and white key assembly for the
related keys.
With the key frame placed upside down, push the
hammer forward from the rear, then a click sound is
heard and the hammer bearing section can be removed
from the hammer axis of the key frame.
Take out the hammer sideways. (Fig.16, Fig.17)
*When removing the hammer, take care not to cause
damage to the hammer bearing and its claw.
(Fig.16)
(Fig.17)

17
DGX-620/YPG-625
16. Assembling the Keyboard Assembly
16-1 Hammer (White Key), (Black Key)
After applying grease to the bearing section of the
hammer, bring the hammer (white key)(black key)
sideways from the rear, fit its bearing section to the
hammer axis of the key frame and pull it forward until a
click sound is heard. (Fig.18)
*There are 8 hammer types differing in weight. Be sure to
check the type of the hammer for correct installation.
(Table 1)
Frame
Hammer, white key
Hammer, black key
Hammer axis
Bottom side
Pull forward
Bearing section
Apply grease
<Rear view>
(Fig.18)
(Table 1)
Part Name Range for Applicable Tone Keys
A-1 - F1
G1 - E3
F3 - D5
E5 - C7
A#-1 - F#1
G#1 - D#3
F#3 - C#5
Hammer, W1
Hammer, W2
Hammer, W3
Hammer, W4
Hammer, B1
Hammer, B2
Hammer, B3
Hammer, B4 D#5 - A#6
White KeyBlack Key

18
DGX-620/YPG-625
16-6 Actuate Rubber
After applying grease to top and bottom faces of the
actuate rubber, fit it to the white key (black key). (Fig.21)
Actuate rubber
Fit in this way.
Apply grease
(Fig.21)
16-2 GHL88L Circuit Board
Tighten the six (6) screws marked [260A] to fix the
GHL88L circuit boards. (Fig.13)
16-3 GHL88M Circuit Board
Connect the FFC cable to CN2 of the GHL88M circuit
board, attach the filament tape. (Fig.15)
Pass the end of the cable into the through hole in the
frame and pull it out from its outlet. (Fig.15)
Tighten the seven (7) screws marked [260B] to fix the
GHL88M circuit board. (Fig.13))
Rubber contact Rubber contact
GHL88L
Triangle mark Triangle mark
Front
Rubber contact Clip
GHL88L
(Fig.19)
(Fig.20)
16-4 GHL88H Circuit Board
Tighten the five (5) screws marked [260C] to fix the
GHL88H circuit board. (Fig.13)
16-5 Rubber Contact
Note that the rubber contact has s specific installation
direction. Be careful not to install it in the wrong
direction.
*A triangle mark (
∆ ) on the rubber contact must face
the front. (Fig.19)
To prevent looseness of the rubber contact, fit it
securely in place using a clip or similar object.
(Fig.20)

19
DGX-620/YPG-625
16-7 White key assembly and black key assembly
After applying grease to the key guide, install the white
key assembly/black key assembly.
At this time, check to make sure that the key guide of the
key frame and inside slit at the front of white key as well
as the contact arm of the hammer and actuate rubber of
the white key assembly/black key assembly are installed
properly. (Fig.22)
Use the four (4) screws marked [270A] to fix 1 octave
white key assembly/black key assembly. (Fig.10)
16-8 Use the two (2) screws marked [270B] to fix the A-1 to
B-1 keys. (Fig.10)
16-9 Use a screw marked [270C] to fix the C7 key. (Fig.10)
Contact arm
Hammer
Actuate rubber Slit
Slit
Contact arm
<Side view>
Apply grease
Key guide
Key guide
Actuate rubber
(Fig.22)

20
DGX-620/YPG-625
Pin Pin
No.
NAME I/O FUNCTION
No.
NAME I/O FUNCTION
1 VSS - VSS 65 VSS - VSS
2TESTN I Input for TEST 66 IOVDD - IOVDD +3.3V
3PLLBPN I PLL bypass select 67 LBN/LWRN/PF6 O External memory lower-byte enable
4PLLVDD - PLLVDD +2.5V 68 UBN/UWRN/PF7 O External memory upper-byte enable
5CIN - Capacitor terminal for PLL 69 RDN/PF4 O External memory read enable
6 PLLVSS - PLLVSS 70 MD00 I/O
7TRSTN I 71 MD08 I/O
8TMS I 72MD01 I/O
9 TCK I JTAG input 73 MD09 I/O External memory data bus
10 TDI I 74 MD02 I/O
11 TD0 O JTAG output 75 MD10 I/O
12 XI I Crystal oscillator 76 MD03 I/O
13 XO O Crystal oscillator 77 VSS - VSS
14 VSS - VSS 78 MD11 I/O
15 VDD - VDD +2.5V 79 MD04 I/O
16 ICN I Hardware reset 80 MD12 I/O
17 ECSN I CPU I/F chip select 81 MD05 I/O
18 EWRN/PD5 I CPU I/F write enable 82 MD13 I/O External memory data bus
19 ERDN/PD4 I CPU I/F read enable 83 MD06 I/O
20 EA3/PD3 I
CPU I/F address bus
84 MD14 I/O
21 EA2/PD2 I 85 MD07 I/O
22 EA1/PD1 I 86 MD15 I/O
23 EA0/PD0 I 87 WRN/PF5 O External memory write enable
24 IOVDD - IOVDD +3.3V 88 VSS - VSS
25 ED0/PC0 I/O
CPU I/F data bus
89 VDD - VDD +2.5V
26 ED1/PC1 I/O 90 IOVDD - IOVDD +3.3V
27 ED2/PC2 I/O 91 MA17 O
28 ED3/PC3 I/O 92 MA16 O
29 ED4/PC4 I/O 93 MA15 O
30 ED5/PC5 I/O 94 MA14 O
31 ED6/PC6 I/O 95 MA13 O
32 ED7/PC7 I/O 96 MA12 O
33 VSS - VSS 97 MA11 O External memory address bus
34 IRQ0N/PH0 I Interrupt input 98 MA10 O
35 TxD0 O Serial output 99 MA09 O
36 RxD0 I serial input 100 MA08 O
37 TxD1/PG2 O Serial output 101 MA07 O
38 RxD1/PH1 I serial input 102 MA06 O
39 SCLK1/PH2 I External synchronization clock 103 MA05 O
40 SD0 O Serial output 104 VSS - VSS
41 SDI/PH3 I serial input 105 MA04 O
42 BCLK O Bit clock output 106 MA03 O External memory address bus
43 WCLK/SY0 O Word clock output 107 MA02 O
44 SYSCLK/PG3 O Clock output 108 MA01 O
45 VSS - VSS 109 CS0N/PG0 O External memory chip select
46 VDD - VDD +2.5V 110 MA18 O
47 IOVDD - IOVDD +3.3V 111 MA19 O
External memory address bus
External memory address bus
48 PA0 I/O
I/O port
112 MA21/PF1 O
49 PA1 I/O 113 MA22/PF2 O
50 PA2 I/O 114 MA20 O
51 PA3 I/O 115 MA23/PF3 O
52 PA4 I/O 116 CS1N/PG1 O External memory chip select
53 PA5 I/O 117 MA00/PF0 O
54 PA6 I/O 118 VSS - VSS
55 PA7 I/O 119 VDD - VDD +2.5V
56 VSS - VSS 120 IOVDD - IOVDD +3.3V
57 PB0 I/O
I/O port
121 CS2N/PE0 O
58 PB1 I/O 122 CS3N/PE1 O
59 PB2 I/O 123 CS4N/CASN/PE2 O
60 PB3 I/O 124 CS5N/PE3 O
61 PB4 I/O 125 CS50RDN/PE4 O External memory chip select
62 PB5 I/O 126 CS51WRN/PE5 O
63 PB6 I/O 127 CS52WRN/PE6 O
64 PB7/SYI I/O 128
CS53WRN/RASN/PE7 O
YMW767-VTZ (X6055A00) CPU
DM: IC101
■ LSI PIN DESCRIPTION
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