Yamaha YDO-323 User manual

SERVICE MANUAL
■CONTENTS
SPECIFICATIONS..................................................................... 3
PANEL LAYOUT....................................................................... 4
DISASSEMBLY PROCEDURE ................................................. 5
LSI PIN DESCRIPTION........................................................... 15
IC BLOCK DIAGRAM ............................................................. 17
CIRCUIT BOARDS.................................................................. 18
TEST PROGRAM ................................................................... 27
BACKING UP DATA AND INITIALIZING THE SETTINGS ....
32
TRANSMITTING SONG DATA BETWEEN THE COMPUTER
AND YDP-323 .......................................................................
33
MIDI IMPLEMENTATION CHART.......................................... 34
MIDI DATA FORMAT ............................................................. 35
PARTS LIST
BLOCK DIAGRAM
CIRCUIT BOARD LAYOUT & WIRING
OVERALL CIRCUIT DIAGRAM
Copyright (c) Yamaha Corporation. All rights reserved. PDF-K7901 ’05.10
PK 001744

YDP-323
2
IMPORTANT NOTICE
This manual has been provided for the use of authorizedYamaha 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 authorizedYamaha 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 believed to be accurate and applicable to the unit (s) indicated on the cover.The research engineering,
and service departments ofYamaha are continually striving to improveYamaha 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.
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.
■WARNING
Components having special characteristics are marked Zand must be replaced with parts having specification equal to
those originally installed.
■SAVING DATA
Saving and backing up your data
• Data in the instrument’s internal memory can be lost due to operational errors or malfunction. Be sure to save any important
data to external media via a computer connected to the instrument.

YDP-323
3
■SPECIFICATIONS
Item
Keyboard
Sound Source
Polyphony
Voice Selection
Effect
Volume
Controls
Pedal
Demo Songs
Recording Function
Loading song data from
a computer
Jacks/Connectors
Main Amplifiers
Speakers
Dimensions (W x D x H)
(with music rest)
Weight
Accessories
YDP-323
88 keys (A-1 - C7)
AWM Stereo Sampling
64 Notes Max.
10
Reverb
Master Volume
Dual, Metoronome, Transpose
Damper, Sostenuto, Soft
10 Demo Songs, 50 Piano Preset Songs
One song 65 KB (approx. 11,000 notes)
Up to 10 songs;Total maximum size 352 KB
MIDI (IN/OUT), PHONES x 2
20W x 2
Oval (12cm x 6cm) x 2
1357mm x 420mm x 814mm [53-3/8" x 16-1/2" x 32-1/16"]
(1357mm x 420mm x 987mm [53-3/8" x 16-1/2" x 38-7/8"])
41kg (90lbs., 6oz)
Owner’s Manual, “50 greats for the Piano”(Music Book), Bench (included or optional depending
on locale), Quick Operation Guide, Headphone hanger set, AC cord, Assembly parts
●Options
BC-100 Bench
UX16 (USB-MIDI interface)

YDP-323
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■PANEL LAYOUT
MIDI
INOUT
PHONES
PEDAL
POWER
0 A
1
2
B
C
D
9
3
4
5
6
7
8
YDP-323
1[POWER] switch
2[DEMO/SONG] button
3[PIANO/VOICE] button
4[SELECT] button
5[REC] button
6[PLAY] button
7[METRONOME] button
8[MASTER VOLUME] dial
9[PHONES] jacks
0MIDI [IN] [OUT] terminals
A[PEDAL] terminal
BSoft pedal (left)
CSostenuto pedal (center)
DDamper pedal (right)

YDP-323
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2. Music Rest Assembly
(Time required: About 1 minute)
Remove the four (4) screws marked [S10]. The music
rest assembly can then be removed. (Fig. 2)
■DISASSEMBLY PROCEDURE
Fig. 1
[11b]: TrussHeadScrew4.0X10MFZN2BL(WF000800)
1. Headphone Hanger
(Time required: About 1 minute)
Remove the two (2) screws marked [11b]. The
headphone hanger can then be removed. (Fig. 1)
Fig. 2
[ S10]: BindHeadTappingScrew-13.0X16MFZN2B3(WE971200)
3. Top Board Assembly
(Time required: About 1 minute)
3-1 Close the key cover.
3-2 Remove the three (3) screws marked [S09]. (Fig. 3)
3-3 Slide the top board assembly forward and lift it out.
Caution:
Be sure to attach the removed filament tape just as it was
before removal.
4. Back Board (Time required: About 1 minute)
Remove the screw marked [5bA], the screw marked
[5bB] and the four (4) screws marked [5d]. The back
board can then be removed. (Fig. 3)
PHONES
[11b]
Headphone hanger
[5b]: TrussHeadScrew4.0X12MFZN2B3(WE997700)
[5d]: PWHeadTappingScrew-14.0X20MFZN2B3(WE998900)
[S09]: TrussHeadScrew4.0X16MFZN2B3(WE977600)
Fig. 3
<Rear view>
K K K K
Music rest assembly
[S10]
[S10]
[S09] [S09]
[5bB]
[5bA]
[5d]
[5d]
Top board assembly
Back board
Side board assembly R
Side board assembly L

YDP-323
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●Power Supply Unit
Fig. 5
[1]: BindHeadTappingScrew-B3.0X10MFZN2B3(WE972200)
[6]: BindHeadTappingScrew-B3.0X12MFZN2W3(WE987400)
[7A]: BindHeadTappingScrew-B4.0X10MFZN2B3(WE972300)
6. PS Circuit Board, PowerTransformer
(Time required: About 5 minutes)
6-1 Remove the top board assembly. (See procedure 3)
6-2 Remove the power supply unit. (See procedure 5)
6-3 Remove the three (3) screws marked [6], the two (2)
screws marked [7A] and the two (2) screws marked
[1]. The PS circuit board can then be removed from
the AC inlet plate. (Fig. 5)
6-4 PowerTransformer
Using the soldering iron, remove the seventeen
soldered place of the power transformer on the PS
circuit board. The power transformer can then be
removed from the PS circuit board. (Fig. 5-1)
* While soldering, be careful not to apply too much heat.
It might cause peeling off the land pattern.
Fig. 4
5. Circuit Boards & Assemblies (Main Unit)
(Time required: About 3 minutes each)
5-1 Remove the top board assembly. (See procedure 3)
5-2 Each circuit board and assembly can be removed by
removing its fixing screws as listed below.
Circuit board and Assembly Ref. No. Screw QTY Fig.
DM S12A Bind Head Tapping Screw-B 3.0X6 MFZN2W3 (WE936300) 4 4
MAEQ S12B Bind Head Tapping Screw-B 3.0X6 MFZN2W3 (WE936300) 6 4
PS Cover Assembly 103A Bind Head Tapping Screw-1 3.5X12 MFZN2W3 (WE970900) 5 4
Power Supply Unit 103B Bind Head Tapping Screw-1 3.5X12 MFZN2W3 (WE970900) 3 4
D-JACK Assembly S13A Bind Head Tapping Screw-1 3.5X12 MFZN2W3 (WE970900) 4 4
Speaker L S07A Truss Head Tapping Screw-1 4.0X16 MFZN2Y (WE965700) 4 4
Speaker R S07B Truss Head Tapping Screw-1 4.0X16 MFZN2Y (WE965700) 4 4
[103A]
[103A]
[103B] [103A]
Power supply assembly
PS cover assembly
DM MAEQ
[S07A] [S13A] [S12A] [S12B]
Speaker L Speaker R
D-JACK assembly
DM MAEQ
[S12A] [S12B]
[S07B][S07B]
AC inlet plate
Power transformer
[6] [6]
[1]
[6]
[7A]
PS

YDP-323
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7. DJACK Circuit Board
(Time required: About 3 minutes)
7-1 Remove the top board assembly. (See procedure 3)
7-2 Remove the D-JACK assembly. (See procedure 5)
7-3 Remove the three (3) screws marked [3A] and the two
(2) screws marked [4]. The DJACK circuit board can
then be removed from the D-JACK angle. (Fig. 6)
Fig. 5-1
●D-JACK Assembly
[3A]: BindHeadTappingScrew-B3.0X8MFZN2B3(WE774400)
[4]: BindHeadTappingScrew-B3.0X8MFZN2W3(WE774300)
Fig. 6
Solder
(Pattern side)
PS
<Bottom view>
8. Key Cover Assembly
(Time required: About 2 minutes)
8-1 Close the key cover.
8-2 Remove the top board assembly. (See procedure 3)
8-3 Lift the rear key cover assembly. (Fig. 7)
8-4 Lean slightly the key cover assembly so that the guide
pin can be removed from the guide rail. (Fig. 7-1)
* When removing, be sure not to nake scratches on the
side cover.
* When reinstalling the key cover assembly, apply a
masking shield tape around the guide rail to prevent
from making scratches on the assembly.
Fig. 7
Fig. 7-1
[3A] D-JACK angle
[4]
DJACK
Key cover assembly
Key cover assembly
Guide pin
Guide rail

YDP-323
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10. Stopper Rail Assembly
(Time required: About 5 minutes)
10-1 Remove the top board assembly. (See procedure 3)
10-2 Remove the key cover assembly. (See procedure 8)
10-3 Remove the rack L and R. (See procedure 9)
10-4 Remove the two (2) screws marked [S13B] each from
both sides of the assembly. (Fig. 8)
10-5 Remove the six (6) screws marked [S13C] .The stopper
rail assembly can then be removed. (Fig. 9)
11. End Block Assembly (L, R)
(Time required: About 5 minutes)
11-1 Remove the top board assembly. (See procedure 3)
11-2 Remove the key cover assembly. (See procedure 8)
11-3 Remove the rack L and R. (See procedure 9)
11-4 Remove the stopper rail assembly. (See procedure 10)
11-5 Remove the screw marked [S08]. (Fig. 9)
11-6 Slide the end block assembly L backward and lift it
out.
* The left and right end block assembly can then be
removed in the same manner.
12. Keyboard Assembly
(Time required: About 10 minutes)
12-1 Remove the top board assembly. (See procedure 3)
12-2 Remove the key cover assembly. (See procedure 8)
12-3 Remove the rack L and R. (See procedure 9)
12-4 Remove the stopper rail assembly. (See procedure 10)
12-5 Remove the end block assembly L and R.
(See procedure 11)
12-6 Remove the nine (9) screws marked [S01] and the two
(2) screws marked [S02]. The keyboard assembly can
then be removed. (Fig. 9)
[S01]: PanHeadScrew5.0X25MFZN2W3SW(WF001500)
[S02]: BindHeadTappingScrew-14.0X14MFZN2W3(WE971900)
[S08]: BindHeadTappingScrew-B4.0X10MFZN2W3(WE974500)
[S13C]: BindHeadTappingScrew-13.5X12MFZN2W3(WE970900)
9. Rack (L, R)
(Time required: About 3 minutes each)
9-1 Remove the top board assembly. (See procedure 3)
9-2 Remove the key cover assembly. (See procedure 8)
9-3 Remove the three (3) screws marked [S06]. The rack
L can then be removed. (Fig. 8)
* The left and right rack can then be removed in the same
manner.
[S03]: BindHeadTappingScrew-13.5X16MFZN2W3(WE970700)
[S04A]: TrussHeadTappingScrew-13.5X25MFZN2W3(WE970200)
[S06]: BindHeadTappingScrew-13.5X20MFZN2W3(WE971500)
[S13B]: BindHeadTappingScrew-13.5X12MFZN2W3(WE970900)
Fig. 8
<Left side view>
Fig. 9
N N
F
F
F
Rack L
Guide rail L
[S06] [S06]
[S03]
[S04A]
[S13B]
Stopper rail
assembly Back top board
assembly
Arm
assembly L
[S01] [S01] [S01][S13C] [S01]
Stopper rail assembly
[S13C][S08]
End block assembly L [S02]
[S13C]
End block assembly R
Keyboard assembly
[S02]

YDP-323
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13. MVR Circuit Board, PANEL Circuit Board
(Time required: About 7 minutes each)
13-1 Remove the top board assembly. (See procedure 3)
13-2 Remove the key cover assembly. (See procedure 8)
13-3 Remove the rack L and R. (See procedure 9)
13-4 Remove the stopper rail assembly. (See procedure 10)
13-5 Remove the end block assembly L. (See procedure 11)
13-6 MVR Circuit Board
Remove the three (3) screws marked [9A]. The MVR
circuit board can then be removed. (Fig. 10)
13-7 PANEL Circuit Board
Remove the six (6) screws marked [9B]. The PANEL
circuit board can then be removed. (Fig. 10)
Fig. 10
●End Block Assembly L
[9]: BindHeadTappingScrew-B3.0X8MFZN2W3(WE774300)
14. Power Switch Assembly
(Time required: About 7 minutes)
14-1 Remove the top board assembly. (See procedure 3)
14-2 Remove the key cover assembly. (See procedure 8)
14-3 Remove the rack L and R. (See procedure 9)
14-4 Remove the stopper rail assembly. (See procedure 10)
14-5
Remove the end block assembly R. (See procedure 11)
14-6 Remove the two (2) screws marked [30]. The power
switch assembly can then be removed. (Fig. 11)
Fig. 11
●End Block Assembly R
[30]: BindHeadTappingScrew-B3.0X8MFZN2W3(WE774300)
15. HP Circuit Board
(Time required: About 6 minutes)
15-1 Remove the top board assembly. (See procedure 3)
15-2 Remove the key cover assembly. (See procedure 8)
15-3 Remove the rack L and R. (See procedure 9)
15-4 Remove the stopper rail assembly. (See procedure 10)
15-5
Remove the end block assembly L. (See procedure 11)
15-6 Remove the two (2) hexagonal nuts marked [3B]. The
HP circuit board can then be removed. (Fig. 12)
Fig. 12
[3B]: HexagonalNut12X14X2P=1.0(WF559900)
Fig. 13
[T2f]: BindHeadTappingScrew-13.5X12MFZN2W3(WE970900)
16. PL Circuit Board
(Time required: About 10 minutes)
16-1 Remove the top board assembly. (See procedure 3)
16-2 Remove the key cover assembly. (See procedure 8)
16-3 Remove the rack L and R. (See procedure 9)
16-4 Remove the stopper rail assembly. (See procedure 10)
16-5 Remove the end block assembly L and R.
(See procedure 11)
16-6 Remove the keyboard assembly. (See procedure 12)
16-7 Remove the screw marked [T2f]. The PL circuit board
can then be removed. (Fig. 13)
[30]
Power switch assembly
[9B] [9B] [9A]
MVRPANEL
●Bottom view
[3B]
HP
PL
[T2f]
Arm assembly L

YDP-323
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Fig. 14
[S04]: TrussHeadTappingScrew-13.5X25MFZN2W3(WE970200)
Fig. 16
Fig. 15
[5c]: BindHeadScrew6.0X16MFZN2B3(WE969400)
<Bottom view>
18. Main Unit
(Time required: About 3 minutes)
18-1 Spread a soft cloth like a blanket on the floor where
the main unit is to be placed in advance.
18-2 Remove the headphone hanger. (See procedure 1)
18-3 Disconnect the AC cord and the PK-LF cable.
(Fig. 15)
18-4 Remove the four (4) screws marked [5c]. (Fig. 16)
18-5 Move the main unit backward, lift it and place it on
the cloth gently. (Fig. 17)
* For safety, this work should be done by two persons.
17. BackTop Board Assembly
(Time required: About 3 minutes)
17-1 Remove the top board assembly. (See procedure 3)
17-2 Remove the two (2) screws marked [S04A] each from
both sides of the assembly. (Fig. 8)
17-3 Remove the six (6) screws marked [S04B]. The back
top board assembly can then be removed. (Fig. 14)
Arm assembly L Keybed assembly
[S04C]
[S04B] [S04B]
Arm assembly R
Back Top assembly
ACINLET
PEDAL
PK-LF cable
AC cord
[5c]