Yamaha AvantGard N3 Manual

MHB31
HYBRID PIANO
N3, N2, N1
NU1
MAINTENANCE HANDBOOK
September 2012 Ver.1

2
INTRODUCTION
This booklet is the service technician manual for the AvantGrand N3, N2, N1 and NU1.
It contains technical service information needed for providing product after-service mainly
by piano service personnel.
Please also refer to the service manual if there any areas not covered by the service
information in this manual.
CONTENTS
INTRODUCTION ....... 2
SERVICE CHECK POINTS ....... 3
PIANO ACTION ADJUSTMENT POINTS & STANDARD DIMENSIONS ....... 5
KEY SENSOR MEASUREMENT & SENSOR HEIGHT ADJUSTMENT ....... 6
N1 AND NU1 KEY SHUTTER INSTALLATION PROCEDURE ....... 10
EXTERNAL PART FINISHING LIST ....... 11
N3 PARTS LIST ....... 12
N2 PARTS LIST ....... 13
N1 PARTS LIST ....... 14
NU1 PARTS LIST ....... 15
N3 DISASSEMBLY PROCEDURE ....... 16
N2 DISASSEMBLY PROCEDURE ....... 20
N1 DISASSEMBLY PROCEDURE ....... 24
NU1 DISASSEMBLY PROCEDURE ....... 27
N3, N2 KEY COVER ASSEMBLY-REPLACEMENT PROCEDURE ....... 30
N3 TOP BOARD (F) ASSEMBLY-REPLACEMENT PROCEDURE ....... 33
N1 KEY COVER REPLACEMENT PROCEDURE ....... 35
N1 ARM LOWER ASSEMBLY REPLACEMENT PROCEDURE ....... 41
N1 ARM UPPER ASSEMBLY REPLACEMENT PROCEDURE ........ 43
Q&A ........ 44

3
N3, N2, N1, NU1
SERVICE CHECK POINTS
CATEGORY CHECKPOINT MODELS
During
assembly
During reassembly after servicing, check that wiring bundle connectors for all electrical
circuits are securely connected inside.
N3, N2, N1,
NU1
During
assembly-
disassembly
Be careful not to damage the key shutter when removing the keys. Scratch marks on the
shutter might cause faulty operation.
N3, N2, N1,
NU1
During
assembly-
disassembly
Do not touch the key shutter with bare hands when removing or installing it. Touching it
with bare hands will cause fingerprint stains and debris to adhere and possibly cause faulty
operation.
N3, N2, N1
During
assembly
Never remove the center rails. N3, N2
During
assembly-
disassembly
Be careful not to bend the angle of hardware for the TW speaker or crush or dent the TW
speaker itself.
N3, N2
Other The upper unit and lower unit on the N1 each have their own separate production No.
When contacting us about them, report each of their production No. on the following
sections (upper unit: shelf-lower switch box lower-surface; lower unit: speaker box lower-
surface, inner-left).
N1
: N2: N3
Center rails

4
N3, N2, N1, NU1
CATEGORY CHECKPOINT MODELS
During
assembly
Check and set the DIP switches on the board when replacing the DM circuit board, and
always execute the factory set of the test program.
N3, N2, N1,
NU1
During
disassembly
Never remove the NU1 side boards and arms. NU1
Side board L
Arm L
Side board R
Arm R

5
N3, N2, N1, NU1
PIANO ACTION ADJUSTMENT POINTS & STANDARD DIMENSIONS
12
58
9.8
The N3, N2, N1, and NU1 have the same piano action as an acoustic piano but utilize shank stoppers instead of strings.
The shank stoppers are positioned so that the timing that the hammer shank contacts the stopper matches the timing that the hammer
head would contact the string in an acoustic piano. Methods for finding if dimensions match standard criteria for the shank stopper such
as hammer let-off and hammer stop are given below. Other standard dimensions and techniques for making adjustments are the same as
for a typical acoustic piano.
Hammer let-off 1 mm
Check the gap between the shank and shank stopper via Silent let-off.
N3 N2 N1
NU1
Hammer head tip position when hammer shank is lightly touching
the cushioning material.
46
12
12
10
64
Above 1 mmAbove 1 mm
Hammer stop 12 mm
Use a ruler or scale to measure the distance in standard units from the top of the
hammer head with the hammer shank lightly contacting the cushioning material,
to the top of the hammer head when caught by the back check after tapping the key.
Space is limited here so after finding the dimensions remove the hammer sensor
unit and shank stopper if necessary.
Hammer leveling (striking distance) 46 mm
Set the striking distance to about 46 mm after checking the movement strength.
With the hammer shank lightly contacting the cushioning material the same as for
checking the hammer stop, use a ruler or scale to measure the distance from the top
of the hammer head and find the dimensions in standard units. The shank stopper
moves in a straight line so a hammer height with a low pitch will be the same for
other pitch ranges.
Hammer let-off 1 mm Hammer stop 8 mm
The distance from hammer let-off to hammer stop is
the distance between the shank stopper lower edge and
the hammer shank.

6
N3, N2, N1, NU1
KEY SENSOR MEASUREMENT & SENSOR HEIGHT ADJUSTMENT
YES
YES
NO
NO
Problem occurs
Make the key sensor measurements
Repair is complete
Is part damaged?
Or is keyboard action mechanism
defective?
Replace parts, adjust keyboard & action,
adjust sensor height
Is problem eliminated
or improved?
Make the key sensor measurements
The following cases require N3, N2, N1, and NU1 keyboard and action adjustment.
1. When playing performance is not satisfactory due to lack of evenness of action/keyboards movement and control.
2. When a problem was found in generation of electronic sounds and required to be checked along with other problems.
3. When the keyboard or key action has been damaged.
Always perform key sensor measurement after making these repairs and adjustments.
KEYBOARD RELATED PROBLEM REPAIR FLOW: HYBRID PIANOS
Sensor system overview
Sensor unit overview and adjustment methods
Definition of term
· REST : Position when the keyboard is not pressed.
· END : Position when the keyboard is lightly pressed to the bottom of the key.
· K1/K2/K3/K4 : Four threshold values between the REST position and END position when a key is pressed. While the value
of the END is 10 mm, the threshold values are K1 = 2.7 mm, K2 = 4.5 mm, K3 = 6.3 mm and K4 = 8.1 mm.
· M1/M2 : Two threshold values between the REST position and END position when a hammer is in motion. The
distance between the M1 and M2 is 10 mm while that between the M2 and END is 1 mm.
The AvantGrand N3, N2, N1 detect keyboard play information via key sensors and hammer sensor, and on the NU1 only via key
sensors. Pedal play information is detected in all cases by pedal sensors. Keyboard movement data detected by each sensor is converted
into keyboard speed (volume) & sounding timing data & muting timing data on the sensor circuit board and then sent to the DM circuit
board as an electronic sound source to produce music sounds.
Though constant height adjustments are not normally required, if the sensor unit was replaced or if the sensor and keyboard positions
have drastically changed due to key or keyboard adjustments then the sensor unit height must be checked and adjusted.

7
N3, N2, N1, NU1
Key sensor unit adjustment (N3, N2)
Hammer sensor adjustment (N3, N2, N1)
Position check
Gap between the lower edge of key and the upper
edge of key sensor unit chassis, when a black key
is depressed to the bottom
Reference dimensions Gap of 3.8 mm to 4.0mm (a)
Adjustment method
Adjust the back-and-forth adjustment screws
(1 each) for the 4 bracket positions on the sensor
unit. (※1)
Position check M2 ON timing in hammer sensor test mode (check buzzer tone sound)
Reference dimensions Gap between hammer shank and stopper at M2 ON timing: 0.5 mm to 1.75 mm
Adjustment method On the N2, N3: adjust by using the hammer sensor adjustment gear
Hammer sensor
adjustment gear
Locking screw
Hammer sensor
adjustment gear
Locking screw
Loosen the hammer sensor adjustment gear and loosen the locking screw.
Adjust the height with the hammer sensor adjustment gear.
Tighten the locking screw and then tighten the hammer sensor adjustment gear.
<Adjustment procedure>
1.
2.
3.
Hammer sensor adjustment gear
Locking screw
* On the N1 and NU1 there is no need to adjust the key sensor unit height.
* The NU1 has no hammer sensor unit.
N1: Adjust by adding hammer sensor height adjuster spacers
Wid
er
th
an
1
.
75
mm
:Loosen the spacer locking screw.
@Loosen the bracket locking screw.
.Add one spacer.
;Tighten the bracket locking screw.
=Tighten the spacer locking screw.
Narrower than 0.5 mm
:Loosen the spacer locking screw.
@Loosen the bracket locking screw.
.Remove one spacer.
;Tighten the bracket locking screw.
=Tighten the spacer locking screw.
Spacerlockingscrew
Spacer
Bracketlockingscrew

8
N3, N2, N1, NU1
Key sensor measurement (keyboard measurement or key sensor calibration) (N3, N2, N1, NU1)
[Setup]
1) Check that the cables and power cords are connected
2) Turn off the power
3) Wear headphones
4) Startup the maintenance mode
While in this state, check on the headphones that sound is emitted in “C chord” for 2 seconds each time showing the
maintenance mode has started.
* In the NU1, no alarm tone is generated but “AG1” is displayed on the LED screen.
5) Let stand idle for 30 seconds to 1 minute (aging for sensor calibration)
[Key sensor measurement]
6)
Measure the “rest value” and “end value” on all keys from 1key to 88key in the following measurement sequence.
[Key sensor measurement start-up method]
Key sensor measurement consists of 2 types. One type is “All key measurement” that rewrites all key measurement values; and the other
type “1 key measurement” that rewrites measurement values only for a specific key.
[All key measurement mode]
* The operating guide tones in the NU1 are generated electronically, and an operating guide appears on the panel LED screen.
* If measurement fails, then the 78[D4] and 76[C4] keys are trilled and the tone for the applicable error key is generated (*NU1: key
no. displayed).
Measure the “rest value” Measure the “end value”
Key sensor measurement mode operating procedures
All key
measurement mode
N3, N2, N1 10[F#0]+12[G#0]+14[A#0]+[POWER ON](release key after about 7 seconds)
NU1 [DEMO/SONG]+[+]+[PLAY/STOP]+[POWER ON]
1 key
measurement mode
N3, N2, N1 9[F0]+11[G0]+[POWER ON] (release key after about 7 seconds)
NU1 [DEMO/SONG]+[PIANO/VOICE]+[PLAY/STOP]+ [POWER ON]
Content Task Description
(N3,N2,N1)
Operating guide tones
(N3,N2,N1)
Task Description
(NU1)
Screen display
(NU1)
1Refer to start-up methods Start measurement mode Chord; 1 time/2 seconds Start measurement mode Displays "AG1"
2
Do not touch anything
(sensor aging)
Let stand 30 seconds to
1 minute
Let stand 1 minute to
2 minutes
Displays "AG1"
3Start measurement Depress damper pedal 1 time Chord: Change to 2 taps Not necessary (Auto)
Change to display "rSt"
4Measure the “rest value” Set in state where all keys are
not up and are depressed
Chord: 2 taps Set in state where all keys are
not up and are depressed
Displays "rSt"
5Load data into RAM Depress damper pedal 1 time Chord: Change to 3 taps Push the [PLAY/STOP] button
Change to display "En"
6Measure the “end value” Play keys 1 – 88 to the end
value
Chord: 3 taps Play keys 1 – 88 to the end
value
Displays "En"
7Load data into RAM Depress damper pedal 1 time Chord: Change to 1 time/
2 seconds
Push the [PLAY/STOP] button
Change to display
"n_y"
8Save data and write into
Flash memory
Depress soft pedal 1 time 76[C] tone, sounds at
consecutive taps
Push the [PLAY/STOP] button Displays "PAS"
9End measurement Power OFF Power OFF

9
N3, N2, N1, NU1
Definition of term
· REST : Position when the keyboard is not pressed.
· END : Position when the keyboard is lightly pressed to the bottom of the key.
· K1/K2/K3/K4 : Four threshold values between the REST position and END position when a key is pressed. While the value
of the END is 10 mm, the threshold values are K1 = 2.7 mm, K2 = 4.5 mm, K3 = 6.3 mm and K4 = 8.1 mm.
· M1/M2 : Two threshold values between the REST position and END position when a hammer is in motion. The
distance between the M1 and M2 is 10 mm while that between the M2 and END is 1 mm.
Startup method
N3, N2, N1: [A-1]+[B-1]+[C0]+Power ON Jrelease keys after 7 seconds
NU1: [METRONOME]+[RECORD]+[PLAY/STOP]+Power ON
Select Test mode No. 27 with [+]/[-] and execute [PLAY/STOP]
Checking method
Check that the K1 through K4 key positions detected by the key sensor are
heard as a sine wave (A5) tone on the headphones.
Startup method
N3, N2, N1: [A-1] + [B-1] +Power ON Jrelease keys after 7 seconds
Check that the M1 ON and M2 ON positions detected by the hammer sensor
are heard as a sine wave (A5) tone on the headphones.
* The NU1 has no hammer sensor unit.
10 mm
Continuous
sound
Continuous
sound
M2
END
REST
M1
Continuous
sound
Discontinuous
sound
Short-cycle
discontinuous
sound
K1 (2.7 mm)
K2 (4.5 mm)
K3 (6.3 mm)
K4 (8.1 mm)
END (10 mm)
REST
Continuous
sound
[1 key measurement mode]
* The operating guide tones in the NU1 are generated electronically, and an operating guide appears on the panel LED screen.
* If measurement fails, then the 78[D4] and 76[C4] keys are trilled and the tone for the applicable error key is generated (*NU1: key
no. displayed).
[Key sensor test mode (N3, N2, N1, NU1)]
[Hammer sensor test mode (N3, N2, N1)]
Sensor test mode
Content Task Description
(N3,N2,N1)
Operating guide tones
(N3,N2,N1)
Task Description
(NU1)
Screen display
(NU1)
1Refer to start-up methods Start measurement mode Chord; 2 taps Start measurement mode Displays "1Ky"
2
Do not touch anything
(sensor aging)
Let stand 30 seconds to
1 minute
Let stand 1 minute to
2 minutes
Displays "1Ky"
3
Make measurement key
setting and start measurement
Play only keys measured Change measurement key
tone to 2 taps
Play only keys measured Displays key no.
Set measurement key Not necessary (Auto)
Push the [PLAY/STOP] button Change to display "rSt"
4Measure the “rest value” Set in state where all keys
are not up and are depressed
2 tap measurement key
tone
Set in state where all keys
are not up and are depressed
Displays "rSt"
5Load data into RAM Depress damper pedal 1 time Change to 3 taps
Push the [PLAY/STOP] button Change to display "En"
6Measure the “end value” Play measurement key to the
end value
3 taps Play measurement key to the
end value
Displays "En"
7Load data into RAM Depress damper pedal 1 time
Change to 1 time/2 second tone Push the [PLAY/STOP] button Change to display "n_y"
8Save data and write into
Flash memory
Depress soft pedal 1 time
76[C] tone, sounds at
consecutive taps
Push the [PLAY/STOP] button Displays "PAS"
9End measurement Power OFF Power OFF

10
N1, NU1
N1 AND NU1 KEY SHUTTER INSTALLATION PROCEDURE
1. Remove the key and both adjacent keys from the piano. (Photo 1) When exchanging the highest note key or the lowest note key of
the keyboard, the key and the two closest keys are also removed.
2. Take the replacement keys in hand, turn them over, and align the front and back position of the key on the 3 keys by way of the
key grooves. (Photo 2)
3. Peel the film from the key shutter part. (Photo 3) Pay attention to prevent dirt and damage to the key shutter.
4. Put the key shutter onto the key. The key shutter should be placed at even intervals between each of the 3 key shutters. (Photo 4)
5. Use the staple gun to lock the key shutter in place. (Photo 5) Check that the staples are securely mated to the key shutter.
6. Reinstall the key onto the piano.
7. After replacing the keys, repeatedly tap and release each key several times, and check that the key shutter does not bind on the key
sensor bracket.
8. Execute the maintenance program ‘Key Measurement’. Make sure to inspect that the key works properly using the key sensor test
mode.
Place at even intervals.
Place at even intervals.
Photo 3 (N1) Photo 4 (N1)
Photo 5 (N1)
Photo 5 (NU1)
Photo 3 (NU1) Photo 4 (NU1)
Photo 1 (N1) Photo 1 (NU1)
Film
Film
STAPLE(Stainless)
8mm or 10mm
STAPLE(Stainless)
8mm or 10mm
Gray scale block
Key Shutter
Photo 2
View of using the staple gun
STAPLE GUN : TP-M (TX500250: Piano Service Parts)
STAPLE : MAX8080FC 8x8mm (TX500330: Piano Service Parts)
Installation with a staple gun (shown below) is needed only for keyboard replacement of N1. The gray scale shutter can
individually be replaced, in the same way as N3 and N2, for the key shutter replacement.
Be sure to perform related keyboard and action adjustments and key sensor measurement, in addition to shutter installation,
when you repair or replace the keyboard.

11
N3, N2, N1, NU1
EXTERIOR PART FINISHING LIST
Surface finishing of main exterior parts is summarized by model in the tables below.
Repair coatings can be applied to polyester coated parts needing refinishing. Other part sections should simply be replaced.
The parts finished with asterisked (*) polyester paint can be repaired by painting as well in the same way as the other parts with
normal polyester paint. However, there could be slight difference in the shine of the finish between the paint currently supplied as
a service parts and the original paint because these paints were produced in different locations. In this reason, replacing the part is
recommended when it is possible. Refer to the parts list (page 14 for N1 and page 15 for NU1) for replaceable parts.
N3 Part Surface treatment types
TOP BOARD REAR Polyester coating
TOP BOARD FRONT Polyester coating
TOP BOARD FRONT RAIL Polyester coating
TOP STICK Polyester coating
FRONT TOP RAIL Polyester coating
BACK TOP RAIL Polyester coating
MUSIC REST Polyester coating
MUSIC STOPPER UV coating
MUSIC SHELF Polyester coating
FRONT RAIL Polyester coating
KEY COVER Polyester coating
KEY BLOCK Polyester coating
LEG (FRONT, REAR) Melamine baking finish
PEDAL UNIT Polyester coating
N2 Part Surface treatment types
TOP BOARD REAR Polyester coating
TOP BOARD FRONT Polyester coating
FRONT TOP RAIL Polyester coating
MUSIC REST Polyester coating
MUSIC SHELF Acrylic urethane coating
FRONT RAIL Polyester coating
KEY COVER Polyester coating
KEY BLOCK Polyester coating
CENTER BOARD Polyester coating
ARM UPPER Polyester coating
ARM LOWER Polyester coating
SIDE BOARD PET film attached
LEG Melamine baking finish
N1 Part Surface treatment types
TOP BOARD Polyester coating
FRONT BOARD Polyester coating
MUSIC REST Polyester coating
MUSIC STOPPER Lacquer coating
FRONT RAIL Polyester coating *
KEY COVER Polyester coating
KEY BLOCK Uncoated ABS resin
LEG (FRONT) Polyester coating
LEG (REAR) Urethane coating
REAR LEG ANGLE Electro-deposition coating
PEDAL BOX Side surface: PVC sheeting, upper surface: lacquer coating
NU1 Part Surface treatment types
TOP BOARD Polyester coating
SIDE BOARD Polyester coating *
ARM Polyester coating *
UPPPER BOARD Polyester coating
KEY COVER Polyester coating *
MUSIC REST Lacquer coating
KEY STOPPER RAIL Polyester coating
FRONT RAIL Polyester coating *
KEY BLOCK Uncoated ABS resin
LOWER BOARD Polyester coating
LEG Polyester coating *
END RAIL Polyester coating *

12
N3, N2, N1, NU1
MUSIC SHELF ASSEMBLY
TOP BOARD ASSEMBLY
KEY COVER ASSEMBLY
PEDAL UNIT
MUSIC REST ASSEMBLY
FRONT BOARD ASSEMBLY
LEG ASSEMBLY
FRONT RAIL ASSEMBLY
N3 PARTS LIST
DESCRIPTION PART NO. REMARKS
Exterior
TOP BOARD FRONT ASSEMBLY ZE082300 Replacement set (service parts kit)
TOP BOARD FRONT replacement adjuster part set ZE082400 Replacement set (service parts kit)
TOP STICK ASSEMBLY WQ253000
FRONT TOP RAIL ASSEMBLY WQ249200
MUSIC REST ASSEMBLY WQ249600
Including music sheet retainer to Prod No. JAQI01000
MUSIC REST ASSEMBLY WQ249601 Including music sheet retainer Prod No. JAQI01000 onwards
MUSIC SHELF ASSEMBLY L WQ249400
MUSIC SHELF ASSEMBLY R WQ249500
FRONT RAIL ASSEMBLY WQ248900
KEY COVER ASSEMBLY ZE082500 Replacement set (service parts kit)
KEY COVER replacement adjuster part set ZE082600
Must be simultaneously procured when replacing key cover
NONWOVEN KEYBOARD WQ824700
ROTARY DAMPER L WQ253300
ROTARY DAMPER R WQ253400
LEG ASSEMBLY L WQ255700
LEG ASSEMBLY R WQ255800
LEG ASSEMBLY REAR WQ255900
LEG SCREW SET WR724300
CASTER WQ256100
PEDAL UNIT WQ266700
PEDAL LEVER UNIT L WQ256200 For SOFT PEDAL
PEDAL LEVER UNIT R WQ256300 For DAMPER PEDAL
Interior
KEY ASSEMBLY KEY #1 WR824800 With shutter
KEY ASSEMBLY KEY #88 WR833500 With shutter
HAMMER SHANK ASSEMBLY A1 WR822400 K1 - K8 All come with shutter
HAMMER SHANK ASSEMBLY A2 WR822500 K9 - K16
HAMMER SHANK ASSEMBLY A3 WR822600 K17 - K24
HAMMER SHANK ASSEMBLY A4 WR822700 K25 - K32
HAMMER SHANK ASSEMBLY A5 WR822800 K33 - K40
HAMMER SHANK ASSEMBLY A6 WR822900 K41 - K48
HAMMER SHANK ASSEMBLY A7 WR823000 K49 - K56
HAMMER SHANK ASSEMBLY A8 WR823100 K57 - K64
HAMMER SHANK ASSEMBLY A9 WR823200 K65 - K72
HAMMER SHANK ASSEMBLY A10 WR823300 K73 - K80
HAMMER SHANK ASSEMBLY A11 WR823400 K81 - K88
SUPPORT ASSEMBLY FELT A1 WR823900 K1 - K30
SUPPORT ASSEMBLY FELT A2 WR824000 K31 - K60
SUPPORT ASSEMBLY FELT A3 WR824100 K61 - K88
KEY SHUTTERS GRAY SCALE V797780R
KEY SHUTTERS BLOCK V797790R
Electrical
Section
HAMMER SENSOR UNIT WB492500
HAMMER SENSOR CIRCUIT BOARD WS316400
HAMMER EMISSION CIRCUIT BOARD VZ14190R
KEY SENSOR UNIT WQ531300
KEY SENSOR CIRCUIT BOARD WQ532300
DM CIRCUIT BOARD WN854300 to Prod No. JAQH01000
DM CIRCUIT BOARD WN854301 Prod No. JAQH01001 onwards *with SW5
ACDC CIRCUIT BOARD WP946500
DCDC CIRCUIT BOARD WM942900
MAD CIRCUIT BOARD WP942500 to Prod No. JAPO01000
MAD CIRCUIT BOARD WT608700 Prod No. JAQH01001 onwards

13
N3, N2, N1, NU1
FRONT RAIL ASSEMBLY
PEDAL ASSEMBLY
LEG ASSEMBLY CENTER BOARD ASSEMBLY
WO GRILL ASSEMBLY
MUSIC REST ASSEMBLY FRONT BOARD ASSEMBLY
KEY COVER ASSEMBLY
ARM UPPER ASSEMBLY
ARM LOWER ASSEMBLY
SIDE BOARD ASSEMBLY
N2 PARTS LIST
DESCRIPTION PART NO. REMARKS
Exterior
FRONT TOP RAIL ASSEMBLY WQ976700
MUSIC REST ASSEMBLY WQ976800
FRONT RAIL ASSEMBLY WQ248900
KEY COVER ASSEMBLY ZE082500 Replacement set (service parts kit)
KEY COVER replacement adjuster part set ZE082600
Must be simultaneously procured when replacing key cover
NONWOVEN CLOTH KEY WR261800
ROTARY DAMPER L WQ253300
ROTARY DAMPER R WQ253400
CENTER BOARD ASSEMBLY WR118600
SIDE BOARD L ASSEMBLY WR118700
SIDE BOARD R ASSEMBLY WR118800
WO GRILL L ASSEMBLY WR128100
WO GRILL R ASSEMBLY WR128200
LEG ASSEMBLY L WQ946300
LEG ASSEMBLY R WQ946400
PEDAL ASSEMBLY WP009900
Interior
KEY ASSEMBLY Key #1 WR824800 With shutter
KEY ASSEMBLY Key #88 WR833500 With shutter
HAMMER SHANK ASSEMBLY A1 WR822400 K1 - K8
The following all come with hammer shutter
HAMMER SHANK ASSEMBLY A2 WR822500 K9 - K16
HAMMER SHANK ASSEMBLY A3 WR822600 K17 - K24
HAMMER SHANK ASSEMBLY A4 WR822700 K25 - K32
HAMMER SHANK ASSEMBLY A5 WR822800 K33 - K40
HAMMER SHANK ASSEMBLY A6 WR822900 K41 - K48
HAMMER SHANK ASSEMBLY A7 WR823000 K49 - K56
HAMMER SHANK ASSEMBLY A8 WR823100 K57 - K64
HAMMER SHANK ASSEMBLY A9 WR823200 K65 - K72
HAMMER SHANK ASSEMBLY A10 WR823300 K73 - K80
HAMMER SHANK ASSEMBLY A11 WR823400 K81 - K88
SUPPORT ASSEMBLY A1 WR823900 K1 - K30
SUPPORT ASSEMBLY A2 WR824000 K31 - K60
SUPPORT ASSEMBLY A3 WR824100 K61 - K88
KEY SHUTTERS GRAY SCALE V797780R
KEY SHUTTERS BLOCK V797790R
Electrical
Section
HAMMER SENSOR UNIT WB492500
HAMMER SENSOR CIRCUIT BOARD WS316400
HAMMER EMISSION CIRCUIT BOARD VZ14190R
KEY SENSOR UNIT WQ531300
KEY SENSOR CIRCUIT BOARD WQ532300
DM CIRCUIT BOARD WR067700
ACDC CIRCUIT BOARD WR135300
DCDC CIRCUIT BOARD WM942910
MAD CIRCUIT BOARD WT608700

14
N3, N2, N1, NU1
TOP BOARD ASSEMBLY
LEG ASSEMBLY FRONT
LEG ASSEMBLY REAR
FRONT RAIL ASSEMBLY
REAR LEG ANGLE LOWER
PEDAL ASSEMBLY
KEY COVER ASSEMBLY
FRONT BOARD ASSEMBLY
KEY BLOCK
MUSIC REST ASSEMBLY
DESCRIPTION PART NO. REMARKS
Exterior
TOP BOARD ASSEMBLY WU186200 Including music sheet retainer
FRONT BOARD ASSEMBLY WU184700
Front top rail height adjuster spacer 0.5mm WU820400 1 spacer
Front top rail height adjuster spacer 1,0mm WU899200 1 spacer
MUSIC REST ASSEMBLY WU185000
FRONT RAIL ASSEMBLY WU183800
KEY COVER ASSEMBLY WY612200 Replacement set (service parts kit)
ROTARY DAMPER L WV422900
ROTARY DAMPER R WV423000
ARM UPPER ASSEMBLY L WY614000
ARM UPPER ASSEMBLY R WY614100
ARM LOWER ASSEMBLY L WU183600
ARM LOWER ASSEMBLY R WU183700
KEY BLOCK L WU327500
KEY BLOCK R WU327600
FRONT LEG L ASSEMBLY WU287600
FRONT LEG R ASSEMBLY WU287700
REAR LEG L WU312100
REAR LEG R WU312200
REAR LEG ANGLE LOWER WU312500
PEDAL ASSEMBLY WR624200
PEDAL ADJUSTER WF05450R
Interior
KEY ASSEMBLY KEY #1 WW683100 Replacement set (comes packed with shutter)
KEY ASSEMBLY KEY #88 WW691800 Replacement set (comes packed with shutter)
HAMMER SHANK ASSEMBLY A1 WW691900 K1 - K8 All come with shutter
HAMMER SHANK ASSEMBLY A2 WW692000 K9 - K16
HAMMER SHANK ASSEMBLY A3 WW692100 K17 - K24
HAMMER SHANK ASSEMBLY A4 WW692200 K25 - K32
HAMMER SHANK ASSEMBLY A5 WW692300 K33 - K40
HAMMER SHANK ASSEMBLY A6 WW692400 K41 - K48
HAMMER SHANK ASSEMBLY A7 WW692500 K49 - K56
HAMMER SHANK ASSEMBLY A8 WW692600 K57 - K64
HAMMER SHANK ASSEMBLY A9 WW692700 K65 - K72
HAMMER SHANK ASSEMBLY A10 WW692800 K73 - K80
HAMMER SHANK ASSEMBLY A11 WW692900 K81 - K88
SUPPORT ASSEMBLY A1 WW693000 K1 - K30
SUPPORT ASSEMBLY A2 WW693100 K31 - K60
SUPPORT ASSEMBLY A3 WW693200 K61 - K88
KEY SHUTTERS V797780R V886890R (BLOCK)
Electrical
Section
HAMMER SENSOR UNIT WY575300 Comes packed with height adjuster spacer
HEIGHT ADJUSTER SPACER WV361400 1 spacer
HAMMER SENSOR CIRCUIT BOARD WU689000
HAMMER EMISSION CIRCUIT BOARD WU689200
KEY SENSOR UNIT WU108500
KEY SENSOR CIRCUIT BOARD WU688800
DM CIRCUIT BOARD WU276500
DCDC1 CIRCUIT BOARD WM942920
DCDC2 CIRCUIT BOARD WR870510
MAD CIRCUIT BOARD WU366200
Tools STAPLE GUN TX500250 Handling is same as acoustic parts
STAPLE TX500330 8X8 mm Handling is same as acoustic parts
N1 PARTS LIST

15
N3, N2, N1, NU1
FRONT RAIL ASSEMBLY
MUSIC REST ASSEMBLY TOP BOARD ASSEMBLY UPPER BOARD ASSEMBLY
LEG ASSEMBLY
FRONT LEG SUPPORT RAIL
PEDAL ASSEMBLY
KEY COVER ASSEMBLY
LOWER BOARD ASSEMBLY
KEY BLOCK
NU1 PARTS LIST
DESCRIPTION PART NO. REMARKS
Exterior
TOP BOARD ASSEMBLY WZ051900
UPPER BOARD ASSEMBLY WZ051300
Upper front plate height adjuster spacer 0.5mm WU820400 1 spacer
Upper front plate height adjuster spacer 1.0mm WU899200 1 spacer
KEY COVER ASSEMBLY WZ051200
MUSIC REST ASSEMBLY WZ056700
KEY STOPPER RAIL ASSEMBLY WZ051100
FRONT RAIL ASSEMBLY WZ052500
ROTARY DAMPER L 23678100
ROTARY DAMPER R 23678000
ROTARY DAMPER SEAL 23732100 Same on L/R
KEY BLOCK ASSEMBLY L WZ050800
KEY BLOCK ASSEMBLY R WZ050900
LOWER BOARD ASSEMBLY WZ051600
LEG ASSEMBLY L WZ082800
LEG ASSEMBLY R WZ082900
FRONT LEG SUPPORT RAIL WZ058500
FRONT LEG SUPPORT RAIL ANGLE L WZ127500
FRONT LEG SUPPORT RAIL ANGLE R WZ127600
PEDAL ASSEMBLY WZ799800
PEDAL ADJUSTER WF05450R
Interior
KEY ASSEMBLY KEY #1 ZC133400 Replacement set (comes packed with shutter)
KEY ASSEMBLY KEY #88 ZC142100 Replacement set (comes packed with shutter)
HAMMER BUTT ASSEMBLY A1 ZC142200 K1 - K21
HAMMER BUTT ASSEMBLY A2 ZC142300 K22 - K37
HAMMER BUTT ASSEMBLY A3 ZC142400 K38 - K54
HAMMER BUTT ASSEMBLY A4 ZC142500 K55 - K73
HAMMER BUTT ASSEMBLY A5 ZC142600 K74 - K88
WHIPPEN ASSEMBLY WZ094700 K1 - K88
PLASTIC SCALE (KEY SENSOR) WY895200
SHUTTER-TAPE V3792700
Electrical
Section
KEY SENSOR UNIT WY782000
KEY SENSOR CIRCUIT BOARD WY782500
DM CIRCUIT BOARD WU925600
ACDC CIRCUIT BOARD WU924100
MAD CIRCUIT BOARD WY926900
Tools STAPLE GUN TX500250 Handling is same as acoustic parts
STAPLE TX500330 8X8 mm Handling is same as acoustic parts

16
N3
CAUTION: Make sure not to remove the center rail
from the N3. It is impossible to reinstall it
once it is removed.
1. Key Cover
Open the keyboard lid (also called the fall board) the same as on an acoustic grand
piano (GP), raise and remove.
2. Music Shelf and Front Top Rail
2-1 Remove the music shelf (L/R).
Remove the two left/right screws [88A] and remove the music shelf.
2-2 Remove the front top rail.
Remove the left/right screws [78A] (one
each), grip and raise the front top rail, and the
remove it towards yourself.
3. Music Rest
3-1 Remove the four (4) screws marked [78B].
CENTER RAIL
MUSIC SHELF L
[88A]
FRONT TOP RAIL
MUSIC SHELF L MUSIC SHELF R
[88A]
[78A]
[88A]
[78A]
FRONT TOP RAIL
[78B] [78B]
<Top view>
<Front view>
N3 DISASSEMBLY PROCEDURE

17
N3
[93]
[78C] [78C]
[93]
SOUND BOARD
[78C]
4. Sound Board Assembly
4-1 Remove the four (4) screws marked [78C] and two (2) screws marked [93].
4-2 Raise up the sound board assembly, and remove the connector (CN202)
for the YDA3 circuit board.
3-2 Rotate the music rest 90 degrees and remove it.
5. Middle Board
Remove the left/right screws [88B] (one each), and remove the middle board towards you.
<Top view>
<Front view>
Front
side
Back
side
HINGE
MUSIC REST
YDA3
CN202
YDA3
DM
[88B] [88B]
Middle board
Middle board
* The following is another way for removing the music rest.
Shift the stay assembly as shown in the figure below from
the music rest guide to remove the music rest.
WARNING: Applying too much force while rotating it at
this time may cause the hinge to break.
Tip contour on
stay assembly
Slide outwards towards yourself and remove.
* The DM circuit board is now accessible for servicing, etc.

18
N3
6. Sheet Box
6-1 When sheet box is set vertical:
Loosen the 14 screws [78G], slide the sheet box to the left, and then stand it up 90 degrees over the center rail.
* Secure the sheet box assembly with screws for safety after raising it vertically.
SHEET BOX
[78G] [78G] [78G]
[78G][78G] [78D]
[78G]
[78E] [78E]
Junction connector Junction connector Junction connector
ACDC
YDD
YDD
CN50 CN51 CN50 CN51
[78G] [78G]
MUSIC REST GUIDE SHEET BOX
MUSIC SHELF ANGLE L MUSIC SHELF ANGLE R
[78G][78D][78G] [78F]
CN13 CN12 CN11 CN10
CN2
CN1
CN13 CN12 CN11 CN10
CN2
CN1
CN1CN1
REB1
ACDC
REB1
<Top view>
6-2 How to remove Sheet Box:
6-2-1 Remove the music shelf angles L/R.
Remove the screw marked [78D] and loosen the screw marked [78E]. The music shelf angles L/R can then be removed
toward you.
6-2-2 Remove the music rest guide.
Remove the three (3) screws marked [78F]. The music rest guide can then be removed.
6-2-3 Remove each connector. (total of 12 locations)
Disconnect the six (6) connectors of the ACDC circuit board, the connector of the YDD circuit board, two (2) connectors
of the REB1 circuit board and three (3) junction connectors.
6-2-4 Remove the sheet box.
Loosen the fourteen (14) screws marked [78G] and slide the sheet box leftward. Then, lift it to remove it.

19
N3
7. Key Block
Remove the two left/right screws [81], and remove the key block.
8. Front Rail
Remove the nine [82] screws, remove the two left/right screws [78], and remove the key slip.
9. Key Stop Rail
A key nonwoven fabric (black) is attached to the key stop rail so take care not to tear it during removal.
* There are 3 setscrews on the center rail front panel above the nonwoven fabric (black).
10. Action
10-1 Remove the middle board bracket.
Remove the two left/right screws [83], and remove the middle board bracket.
10-2 Remove the action bracket.
Remove the action bracket installation screws and remove the action while gripping the lower
sound part of the shank stopper and the next high sound part of the shank rail as shown in the
photo (right).
11. Shank Stopper
Remove a total of 6 screws at the four locations in the photos, and remove the shank stopper.
12. Hammer Sensor Unit
Removal of the hammer sensor unit is the same as for the GP-SG Silent.
[81] [81]
[78I]
[82] [82] [82]
FRONT RAIL
Key bed bottom
<Top view> Right side
<Right side>
<Bottom view>
[83]
* We recommend you use a screwdriver with long shaft to remove the screws
for the action bracket.
SHANK STOPPER

20
N2
CAUTION: Make sure not to remove the center rail from the N2.
It is impossible to reinstall it once it is removed.
1. Key Cover
Open the key cover (also called the fall board) the same as on an acoustic grand
piano (GP), raise and remove.
2. Top board
2-1 Raise the music rest.
2-2 Open the top board (B). Remove the top board stick assembly from the top board (B)
guide and open the top board (B) guide.
2-3 Remove the SP grill.
Grip the SP grill from the rear side and pull upward to remove the fastening tape, lift and remove.
CENTER RAIL
TOP BOARD B GUIDE
TOP BOARD (B)
MUSIC REST
TOP BOARD STICK
Transfer pathway of the top board stick
Outside
Inside
TOP BOARD B GUIDE
TOP BOARD STICK
* Shifting the top board support within the guide as shown
by the arrow in the figure on the left allows extraction.
* Do not open the top board (B) assembly by 90 degrees
or more or damage may be caused.
SP GRILL
N2 DISASSEMBLY PROCEDURE