Roland MC-303 Groovebox Operating and maintenance manual

MC-303
MD3D3 SERVICE NOTES
First Edition
Issued by RJA
TABLE OF CONTENTS
SPECIFICATIONS
LOCATION OF CONTROLS
EXPLODED VIEW
PARTS LIST
BLOCK DIAGRAM
TEST MODE
FACTORY PRESET
CHECK UP VERSION AND BATTERY VOLTAGE
BULK DUMP
CIRCUIT BOARD (MAIN)
CIRCUIT DIAGRAM (MAIN)
CIRCUIT BOARD (PANEL)
CIRCUIT DIAGRAM (PANEL)
CIRCUIT BOARD (JACK)
CIRCUIT DIAGRAM (JACK)
CHANGE INFORMATION
§yk Page
ft«.... 1
/t*juEHEI... -2
&M® ...3
/t-y 'J Xh4—5
7y?m 6
J-Ts h^E- K7—12
ItI h'J- •7° lJiiy h13
A- va>t/-\y f- U-flEWtll 13
/iju?#>y° „14—15
*«0(MAIN) 16
HSSIII(MAIN) 17
*lfil2(PANEL) 18
HttH(PANEL) 19
*«BI(JACK). 20
0ttia(JACK) 21
&Ht« 22
Roland MC-3CI3
[^Roland 17059847 Copyright ©1996 by ROLAND CORPORATION Printed iJapan AF00 (DP-P) 1
May- 1996
SPEC!FICAT[ONS/f±il
>TONE GENERATOR
MAXIMUM POLIPHONY 28 voices
PARTS 16 parts (Main:8 +RPS:8)
BUILT-IN EFFECTS Reverb, Delay, Chorus, Flanger
TONES 448 tones
RHYTHM SETS 12
»SEQUENCER
TRACKS 8
SONGS 10
PRESET PATTERNS 133
RPS PATTERNS 21
1
VARIATION PATTERNS 300
USER PATTERNS 50
NOTE STORAGE aprox. 14,000notes
RPS SET 30
PATTERN SET 30
TEMPO Quarter note =20.0 to 240.0
RESOLUTION 96 ticks per quarter note
RECORDING METHOD Realtime, Stepl, Step2
^CONNECTORS
.
Output Jacks L(mono), R
Headphone Jack (stereo)
MIDI Connectors (in.out)
Foot Control Jack
AC Adaptor Jack
>CONTROL KNOB
REALTIME MODIFY Cutoff, Resonance, LFO (Modulation, Rate)
Envelope (Attack/Decay/Release)
Panpot, Level, Portamento Time
EFFECT Time/Rate, EFX Level
PLAY QUANTIZE Strength, Velocity, (Grid, Groove, Shuffle)
ARPEGGIO Accent Rate, Octave Rate (33 styles)
OTHERS Low Boost, Master Volume
^KEYBOARD PAD ..
^DISPLAY
IPOWER SUPPLY..
ICURRENT DRAW
.
.16 keys
.7Segments, 6Digits (LED)
.AC Adaptor (DC 9V)
.500mA
^DIMENSIONS ..378(W)x244(D)x91(H)mm
14-1 4/1 6(W)x 9-10/16(D)x 3-9/1 6(H)inches
WEIGHTS
ACCESSORIES.
.3.0kg/6lbs10oz
.MANUAL SET EXP
MANUAL SET DOM
AC Adaptor
100V
117V
220V
240VE
240VA
(excluding AC Adaptor)
(English)
(Japanese)
ACI-100C
ACI-120C
ACI-220J
ACB-240(E)
ACB-240(A)
(PNo.70788956)
(PNo.70788556)
(PNo.00905756)
(PNo.00905767)
(PNO.12449605J0)
(PNo. 12449564)
(PNo. 12449549)
OPTIONS
.
Pedal Switch DP-2, FS-5U

MC-303
PANEL LAYOUT//\°T^He
14 15 li 17 U26 27 28 2!
May. 1996
31 32 33 34 35 36 37 38 33 40
©©® 0©
3ID3
^•^huffle' l^^Qr .
>=Jnik=)&^'=Z=B
CUTOFF RESONANCE
DQ3 &QShB^S8HHHI!|^HI ^I^^V
ooo
v""^. n^"^ y*111^. r
PART OCLCGT
=-BD SIT TXP —C7KH IDM/H^HC RIT UIHbHtJ
CURRENT
0SONG
OPATTERN
^^^MEXT
1- _/
/_/
o
BEAT •
STEPREC
!"^ '^ "^ '^ '^ nOOfRESTl
DELATE If INSERT |[TRANsksEllCHG\feLOirCHG ^ATEirSHIFl|cLK lfPATAT|llNirQDAI»|riZEl ~T IVAHI wferTE ll PTN S*TW II SET Jp WII DuilP I
PLAY QL WMTKE- DE -AY/REVER I—'"-FLA iGER/CHOR IS-
©© ©
•SONG q
QPATTERN BE^T
[Front Panel]
®VR-KNOBMFBLK-LCG
ROTARY POT RK09L12D0 10KBx2
©VR-KNOBMFBLK-LCG
ROTARY POT RK09L1140 10KB
©DS-KEYTOPSD1HMCG
LED SLR-325VCA47
®LED LNJ282RKRXE
©DS-KEYTOP SX1H MCG
©DS-KEYTOP MX2H MCG
©DSKEYTOPSX1HBLK
®DS-KEYTOP MD1H RED
LED SLR-325VCA47
©DS-KEYTOP MX1H MCG
©DS-KEYTOP MD1H MCG
LED SLR-325 MCA47
@DR-KNOB LBLK
ROTARY ENCODER EVQ VEM F01 24B ,
©TS-KEYTOP MX1H BLK
©TS-KEYTOP MD1H BLK
LED SLR-55 VCA49
®TS-KEYTOP MD1H LCG
LED SLR-55 VCA49
©DS-KEYTOP SX1H LCG
©DS-KEYTOP SD1H LCG
LED SLR-325VCA47
©DS-KEYTOP SD2H BLK
LED SLR-325VCA47
©DS-KEYTOP SD3H BLK
LED SLR-325VCA47
©DS-KEYTOP MD4H MCG
LED SLR-325VCA47
©MC-303 PANEL
01013123
01013545
01013123
01013556
01012967
00348490
00899023
01012978
22495317
00900189
22495344
00348490
22495341
22495312
00560745
22485303
01013223
22495371
22495372
15029380
01013356
15029380
01013301
01016867
00348490
00900156
00348490
00900167
00348490
00677212
00348490
01013401
There are two kind of tact switches on the front panel.
Tap key ©, Keyboard Pad © @
EVQ QJJ 05R :00125590
[Display]
5) 7SEG LED LB-603VP
g) MC-303 DISPLAY COVER ..
g> LED SLR-55 VCA49
g) LED SML1216W
§) LED SLR-55MCA49
[Rear Panel]
UFOOT FF-018 BLK
g> GS-BUTTON S1H BLK
PUSH SWITCH SPUN19
g) DCJACKHEC2305-01-250 ..
iPAD-80 CORD HOOK
&MC-303 BOTTOM COVER..
2> MIDI JACKYKF51-5048
§> JACKHIJ7101-01-3010
g) JACKHLJ7001-01-3010
ROTARY POT RK09K12A0A2AA 10KBx2 :13279988
15029567
01013378
15029380
00897289
15039236
12359139
12499175
13129355
13449720
22365708
01013389
13429676
13449283
13449284
POWER DC
Roland MD3D3
DC IN
9V ^MO PEDAL OUTPUT PHONES I
@@@(g) (So) @@
Others
EVQ 213 05R :13169752

MC-303
10 11 12 13 14 15 16 17 18 13 20 21 21
May. 1996
15 36 37 38 39
EXPLODED VI EW/#
[Parts]
®MC-303 PANEL
©MC-303 BOTTOM COVER.....
©PAD-80 CORD HOOK....
©MC-303 DISPLAY COVER.
©FOOTFF-018BLK....
©GS-BUTTON S1H BLK
®DR-KNOB LBLK
®VR-KNOBMFBLK-LCG
©MAIN BOARD ASSY
©PANEL BOARD ASSY
@JACK BOARD ASSY
[Screw]
®3x6mm Binding Head Btight ZC
©3x6mm Binding Head Btight BZC ..
©3x10mm Binding Head Btight BZC
Q) 3x6mm W-sems machine screw ZC
.
01013401
01013389
22365708
01013378
12359139
12499175
22485303
01013123
70788589
70788623
70788634
40011056
40011090
40011112
40017934

MC-303 May. 1996
PARTS LIST//\ -y UXhIC
SAFETY PRECAUTION:
The parts marked Ahave safety-
related characteristics.
Use only listed parts for
replacement.
<7)-e-fo
9tatT?K
CONSIDERATIONS ON PARTS ORDERING
When ordering any parts listed in the parts list, please specify the following items in the order sheet.
QTY PART NUMBER DESCRIPTION MODEL NUMBER
Ex. 10 22575241 Sharp key C-20/50
15 2247017300 Knob (orange) DAC-15D
Failure to completely fill the above items with correct number and descript on will result in delayed or even
undelivered replacement.
/^-y^mzmtz&m^
^--^-v-hiij, WTie<7)4Jg§(±iE?i^ IBALTT$^ mtumo
&H& ^-yj->^- .&£ itmmm
M) 10 22575241 Sharp key C-20/50
15 2247017300 Knob (orange) DAC-15D
^LfEAfttu mUWG2>®&, <#£S$p
H
n3&?H3i-t'§&^ofci? >Mmmti^mm^tci) t
"to «fI^*i3®v>Lito
NOTE :The parts marked #are new (initial parts).
The parts marked !have safety- related characteristics.Use only listed parts for replacement.
MB -* Main Board
PB —Panel Board
JB -Jack Board
CASING/^ -X
#01013401
#01013389
22365708
#01013378
12359139
MC-303 PANEL
MC-303 BOTTOM COVER
PAD-80 CORD HOOK
MC-303 DISPLAY COVER
FOOTFF-018BLK
KNOB. BUTTON/^ V$ %**£>
00677212 DS-KEYTOP MD4H MCG
00900156 DS-KEYTOP SD2H BLK
00900167 DS-KEYTOP SD3H BLK
00900189 DS-KEYTOP SX1H BLK
#01012967 DS-KEYTOP SD1H MCG
#01012978 DS-KEYTOP SX1H MCG
#01013301 DS-KEYTOP SX1H LCG
#01016867 DS-KEYTOP SD1H LCG
22495312 DS-KEYTOP MD1H MCG
22495317 DS-KEYTOP MX2H MCG
22495341 DS-KEYTOP MX1H MCG
22495344 DS-KEYTOP MD1H RED
#22495371 TS-KEYTOP MX1H BLK
#22495372 TS-KEYTOP MD1H BLK
#01013356 TS-KEYTOP MD1H LCG
12499175 GS-BUTTONS1HBLK
22485303 DR-KNOB LBLK
#01013123 VR-KNOB MF BLK-LCG
[PART R.1.2.3].[PART 4.5.6.7]
[PTN SET. RPS SET]
[OCT-. OCT+. TRANSPOSE]
[SELECT<].[SELECT>]
[ACCENT RATE]. [TIME/RATE]. [RANDOM PAN] [LFO]. [ENVELOPE].
[PART SELECT].[PART MUTE].[RHYTHM MUTE]
[SCALE/MEASURE].[PLAY QUANTIZE]
[SHIFT]. [PLAY MODE]
[FUNC]
[PLAY]
[BWD.FWD].[ENTER.EXIT]
[STOP]
[REC]
[TAP]
Key Pad (3.5.8.10.12.15)
Key Pad (1.2.4.6.7.9.11.13.14.16)
Power SW
Value Dial
Master Volume. Control Knobs
SWITCH/X-f V?-
13169752
00125590
/^ 13129355
JACK/v*vO
EVQ213 05R
EVQ QJJ 05Q
SPUN19
TACT SWITCH
TACT SWITCH
Power Switch
SW1. 19-52 on PB
SW2-18onPB
SW53 on JB
13449284
13449283
13429676
13449720
HLJ7001-01-3010
HLJ7101-01-3010
YKF5 1-5048
HEC2305-01-250
6.5mm <j> stereo
6.5mm <j> mono
MIDIx2
DC-In
JKlonJB
JK2.3.4 on JB
JK5 on JB
JK6 on JB
PCB ASSY/X«3S*&p
n
R
#E70788589
#70788623
#70788634
MAIN BOARD ASSY
PANEL BOARD ASSY
JACK BOARD ASSY
00342723
15239229
01013145
15279526
01013156
00786634
17048620
01121245
01013234
15289714
15249111
15259863T0
00346490
15259758T0
15259712T0
15289106
15249104
15169552T0
01013212
15169550T0
15149134
15189251
15189186
15219183
15199256
15169514
15229706S0
^15199137
MB90705
TC6116AF
UPD23C32000GX-364
HM65256BLF-10T
KM681000BLG-7L
HN27C4000G-10
HN27C4000G-10
UPD23C4000SCZ-***
UPD23C4000SCZ-153
UPD63200GS-E2
TC7WU04F
TC74HC4051AF
TC3W01F
TC74HC175F
TC74HC20F
M5238AFP
TC7S04F
TC74HC245P
TD62384AP
TC74HC138P
TD62785P
M5218AP
UPC4570C
M51953AL
TA78L005P
TC74HC04AP
PC910X
AN7805F
TRANSISTOR/ h7>V*$
15319101
15309101
15329507
15129151
15129152
15129198
15129164
15119134
2SC2412KR
2SA1037KR
DTA114EK
2SC1815GR
2SC2878A
DTA124ES
DTC114ES
2SA933S
DlODE/£< *-K
15339105
15339108
#01014645
#01017290
^15039179
15029380
15029567
00897289
00899023
00348490
00560745
15039236
RESISTOR/fiSt
DAN202K
DA204K
MA-165TA-5
MTZJ5.1CT-77
SB20-03E
SLR-55 VCA49
LB-603VP
SML1216W
LNJ282RKRXE
SLR-325VCA47
SLR-325MCA47
SLR-55 MCA49
00342990 EXB-A10E223J
15399907 MNR34J5A153E
15399932 MNR34J5A101
#13919250 RGLD8X103J
POTENTIOMETER/* 'Ja-i
#01013545
#01013556
13279988
#01013223
RK09L12D0 10KBx2
RK09L1 140 10KB
RK09K12A0A2AA 10KBx2
EVQ VEM F01 24B
CPU
PCM Custom
32M MASK ROM
256K PSRAM
1M SRAM
4MEPROM(Blank)
4MEPROM(Programmed)
4M MASK ROM
4M MASK ROM
DAC
Tri.Inverter
8:1 Analog MUX
2to3 Decoder
QUAD D-FlipFlop
DUAL 4in NAND
OPAMP
Inverter
Oct.Bus buffer
Tr.Array
3to8 Decoder
Tr.Array
OPAMP
OPAMP
Reset IC
+5V Regulator
Hex.Inverter
Photo Isolator
+5V Regulator
IClonMB
IC2 on MB
IC3 on MB
IC4 on MB
IC5.6 on MB
IC7 on MB
IC7 on MB
IC7 on MB
IC8 on MB
IC9 on MB
IClOonMB
ICllonMB
IC12onMB
IC13onMB
IC14onMB
IC15onMB
IC16onMB
IClonPB
IC2.4 on PB
IC3.5 on PB
IC6 on PB
IC7 on JB
IC8.10.12.16onJB
IC9.13onJB
ICllonJB
IC14onJB
IC15onJB
IC17onJB
SMD
SMD
SMD
Ql on MB
Q2 on MB
Q3.4 on MB
Ql. 10.11 on JB
Q4.5 on JB
Q6.8 on JB
Q7 on JB
Q9 on JB
Di.Array Dion MB
Di.Array DAI on MB
Dl-54onPB.JB
Zener Diode D55 on JB
Schotkey Diode D56 on JB
LED(Red) LED1-16PB
7Seg/3Digit LED27.28 on PB
LED(Red/Green) LED25 on PB
LED(Red) LED17-20..LED35-39.LED54-57 on PB
LED(Red) PB
LED(Green) LED29 PB
LED(Green) LED24 PB
RArray
RArray
RArray
RArray
RAl-5onMB
RA6 on MB
RA7-llonMB
RAlonPB
Rotary(Dual)
Rotary(Single)
Rotary(Dual)
Rotary Encoder
VR1 on PB
VR2-7 on PB
VR9 on JB
Ul on PB

May. 1996
CAPACITOR/HV^V+J-
MC-303
13649706S0 25MV1OOOHW+T
13639549M0 ECEA1CKA470B C49 on JB
C6.26.30.32.37 on MB
INDUCTOR/^ >#?£
12449381 SBT-0460T
00673889 BLM21B222SPT
12449355 FBR07HA850TB00
13529176 DSS-306-93-F223Z16
Coil Inductor
Chip Beads
Ferrite Beads
EMI Filter
L1.2.11.12onMB
L3-9 on MB
L10onMB.Ll-18onJB
FL1
CRYSTAL/? "J *£JU
00891801 MA-406 24.000MHz XI on MB
CONNECTOR/=I*??
13429299
13429301
13429294
13429293
13369600
13429298
13369604
13369605
13369607
13369599
51048-1000
51048-1200
51048-0500
51048-0400
52147-0510
51048-0900
52147-0910
52147-1010
52147-1210
52147-0410
Cable Holder
Cable Holder
Cable Holder
Cable Holder
Wire Trap
Cable Holder
Wire Trap
Wire Trap
Wire Trap
Wire Trap
CN1.4onPB
CN2 on PB
CN3 on PB
CN5onJB
CN6 on PB
CN7onJB
CNlonMB
CN2.4onMB
CN3onMB
CN5 on MB
WIRING.CABLE/7<-\*y>?\ &-^Jl
00890401
00562512
01014656
00890412
01014678
23505511
10X150-P2.0
12X150-P2.0
5X150-P2.0
10X200-P2.0
4X150-P2.0
9X150-P2.0
onPB(CNl)
on PB(CN2)
onPB(CN3)
onPB(CN4)
onJB(CN5)
on JB(CN7)
BATTERY/SJffi
12569249S0 CR2032 MB
SCREW/* vS
4001 1056 3x6mm Binding Head Btight ZC
4001 1090 3x6mm Binding Head Btight BZC
4001 1112 3x10mm Binding Head Btight BZC
40017934 3x6mm W-sems machine screw ZC
4001 3067 3x8mm W-sems machine screw ZC
MISCELLANEOUS/-? <Df&
on JB(HeatSink)
22465224 SRA-2500 HEATSINK onJB
00340945 AXS20401 1IC SOCKET on MB
12569420 CR2032 Holder on MB
01014978 MC-303 CUSHION onPB
12199599 GROUND TERMINAL M1699 onPB
12199584 GROUND TERMINAL M1698 onJB
40235189 SK-9RING on DR KNOB
01013112 MC-303 PACKING CASE
40122534 DOUBLE FACED ADHESHIVE TAPE #500 W3MM 20M 136P 90cm
40128534 DOUBLE FACED ADHESHIVE TAPE #575X W30MM 30M 10P 30cm
ACCESSORIES/SiMtJSrS
#70788956
#70788556
^00905756
^00905767
^12449605JO
^12449564
^12449549
MC-303 MANUAL SET EXP (English)
MC-303 MANUAL SET DOM (Japanese)
ACI-100C
ACI-120C
ACI-220J
ACB-240(E)
ACB-240(A)
AC Adaptor 100V (DC9V. 1000mA)
AC Adaptor 120V (DC9V. 1000mA)
AC Adaptor 220V(DC9V.1000mA)
AC Adaptor 240VE (DC9V. 1200mA)
AC Adaptor 240VA (DC9V. 1200mA)

MC-303 May. 1996
BLOCK DIAGRAM/7PV?E

May. 1996 MC-303
Test Mode/x^ h:E- K
#Required Items
•Pedal Switch
•Monitor Speaker or Headphone
•MIDI Cable
•To enter the test mode
Turn on the power while pressing [ARPEGGIO ON] and
[R(BD)].
•To exit the test mode
Execute factory preset or turn off the power to exit the
test mode.
#Select and executing the test items
After entering the test mode, execute each of test items.
Press [ENTER] or [SHIFT] button to execute next test
item.
And press the following buttons to jump any
items.
•MIDI^r-y^
A»y v^y
[ARPEGGIO ON] t[R(BD)] *'9 >£# L%ff h E
LTT?K **Wt- [ENTER] ^[SHIFT] $9 >
1) ROM,RAM,Battery Test
2) MIDI,Version Test
=> Press [KEYPAD 4] button with [FUNC]
button.
3) Pedal Test
=> Press [KEYPAD 5] button with [FUNC]
button.
4) SwitchJLED Test
=> Press [KEYPAD 6] button with [FUNC]
button.
5) Encoder Test
=> Press [KEYPAD 7] button with [FUNC]
button.
6) ADC Test
=> Press [KEYPAD 8] button with [FUNC]
button.
7) Sound Test
=> Press [KEYPAD 9] button with [FUNC]
button.
8) Factory Preset
=> Press [KEYPAD 10] button with [FUNC]
button.
1) ROM,RAM/* vtV-tZY
2) MIDI,A-v a>T*Y
=> [FUNC] #9 >iffl Lftff hs
[KEYPAD 4] ** 9>£ff1~o
3) ^iVfXf
=> [FUNC] #9>$:WLb1!)*h.
[KEYPAD 5] $9 >£#1"
o
4) 7,4 y+£EDTX h
=> [FUNC] $9>ifflLfttfb*
[KEYPAD 6] #9>£#i~ o
5)X>3-f-fX b
=> [FUNC] ** 9y£WL&#* b,
[KEYPAD 7] ** 9>£#1~o
6) ADCfX h
=> [FUNC] #* >£# L£rt*£ ,
[KEYPAD 8] #9 >*ff1~o
7) t^^KfXh
=> [FUNC] #9>ifflL%i!)*b,
[KEYPAD 9] #*>4*l¥1~o
8) 77^ HJ- •7"»j-fey h
=> [FUNC] ^^>tffL4#i9,
[KEYPAD 10] *K* >£#"to

MC-303 May. 1996
ROM, RAM, Battery Test
Connecting MIDI-IN and MIDI-OUT with aMIDI cable and
make it form aloop.
MIDI-IN bMIDI-OUT £MIDI *r -~f )1<X' >l --flgMi, Li1"o
i
Turn on the power while pressing [ARPEGGIO] and [R(BD)] buttons
to enter the test mode. And holding down them until appeare the following
display.
r* h*- KKA*£tf>, [ARPEGGIO] t[R(BD)] *K*>£#L&;0**>
Memory test runs automatically.
Battery test runs automatically.
MIDI test runs automatically.
Program ROM NG
=> Check IC7(main)
Data ROM NG
=> Check IC8(main)
Working SRAM NG
=> Check IC5,IC6(main)
*Press [ENTER] or [SHIFT] to
return top of the test mode.
*[ENTER] ^[SHIFT] ifft t
CURRENT
tSHmWNEXT
SB
fwriwi
u
CURRENT NEXT
fffls klMB
Battery NG
Battery is not mounted or
voltage is low.
*Press [ENTER] or [SHIFT] to
return top of the test mode.
*[ENTER] fr [SHIFT] i9ft t
8

May. 1996 MC-303
>MIDI,Version Test
MIDI NG
==> Check ICl(main),Q6,Q7,IC14,
ICi5,D58(jack).
Program ROM Version
Data ROM Version
Remove the MIDI cable and then the pedal test runs automatically.
midi^-7^£J£< t, &mw^y^Tzytf%i£ mto
»Pedal Test
Conneting the pedal switch to PEDAL SW jack.
PEDAL SW 9*v>7 \Z^ ?)\>7s 47f- £jfli L t to
CURRENT NEXT
Ri^SH
SONG
i i
current IEXT
HSi^hEE]
^Ln »A «TB.*C
Pedal Off
Pedal On
Press [ENTER] or [SHIFT] button to start the LED test.
LEDfX Y^^ibhtzibK^ [ENTER] ^[SHIFT] ^?>£# LTT£v>

MC-303 May- 1996
>Switch,LED Test
Connecting monitor speaker or headphone to check sound. MSLTTSv*
-Check main board and panel board.
Press buttons to turn off LEDs.
Scale sounds in sequence when the buttons are pressed in following order.
[ARPEGGIO ON]->[PLAY QUANTIZE]x4->[EFFECT]->[PORTAMENTO]->[LFO]
->[ENVELOPE]->[PART SELECT]->[PART MUTE]->[RHYTHM MUTE]
->[R(BD)][l(SD)]...[7(OTHERS)]->[SEL L]->[SEL R]x5->[BWD]->[FWD]
->[REC]->[STOP]->[PLAY]->[ENTERl->[EXIT]->[OCTAVE -]->[OCTAVE +]
->[TRANSPOSE]->[PTN SET]->[RPS SET]->[PLAY MODE]x3->[SCALE]->[FUNC]
->[SHIFT]X4->[KEYPAD 1]...[KEYPAD 16]->[TAP] *Button number is appeared on
the NEXT.
*NEXT KIJ#* ^#-t***^
Button Conflict NG
=> Check main board and panel bord.
Press [PLAY QUANTIZE] button 4times for turning off [R MODIFY],
[GRID], [GROOVE], [SHUFFLE] LEDs.
[R MODIFY], [GRID], [GROOVE], [SHUFFLE] <7)#LED£M£T1~&
tz#>\Z [PLAY QUANTIZE] *46WLT <rtfSv\>
Press [SEL R] button 5times for turning off [TEMPO], [PTNSET],
[PTN/SONG], [RPS SET], [TONE] LEDs.
[TEMPO], [PTN SET], [PTN/SONG], [RPS SET], [TONE] 0#LED£
miJt&tztbK [selr] #9 y^smm LX <rtfgv^
Press [PLAY MODE] button 3times for turning off [STEPREC],
[SONG], [PATTERN] LEDs.
[STEPREC], [SONG], [PATTERN] (D&LEDitHttt&tzlblZ
[PLAY MODE] #9 >£30# LX <tz SV^
Press [SHIFT] button 4times for turning off [SCALE l], [SCALE2],
[SCALE 3], [SCALE 4] LEDs.
[SCALE 1], [SCALE2], [SCALE 3], [SCALE 4] <F> #LED*fiffi"1" htz
*b\z [shift] #9 y*mwLX <rtf $V\,
Encoder test runs automatically.
10

May. 1996 MC-303
Encoder Test
VALUE DIAL is moved left and right.
VALUE ^>f7;^£4H|i^LtT$v>
*Scale sounds in sequence.
II
-Check main board and panel board.
Press [ENTER] or [SHIFT] button to start the ADC test.
>ADC Test
Each knob is moved left or right.
*Sounds with bend.
Check main board and panel board.
ADC Conflict NG
=> Check main board
and panel board.
Press [ENTER] or [SHIFT] button to start the sound test.
-t^> Kf* YitbtbZtziblZ^ [ENTER] ^[SHIFT] #* >^lflTT$^
11

MC-303 May- 1996
»Sound Test
Souns in following order.
Press [ENTER] or [SHIFT] to go to the next sound.
[ENTER] fr [SHIFT] £#1" Ct~CM'kM& *"to
*Press [KEYPAD l]-[KEYPAD 6] buttons
to jump these sound test (l)-(6).
*[KEYPAD 1HKEYPAD 6] iWt£t
x\ y-iyy y-tz h(i)-(6)^#&-
(1) Center Check (L&R=440Hz)
(2) Panning Check (L=440Hz)
(3) Panning Check (R=440Hz)
(4) Chorus Effect Check (L&R=440Hz,with Chorus)
(5) Reverb Effect Check (L&R=440Hz,with Reverb)
1
(6) Low Boost Check /Move the LOW BOOST knob to left or
nrxhf- x7?right for check of low boogt effect
Low Boost <7)£i3l&flt;^a6£fc#>^
\LOW BOOST oifri-£fcfcWlfrLXTZ^o J
Press [ENTER] or [SHIFT] button to start the sound test.
yr*?> YtTs Yiifcti>htz*>\^ [ENTER] fr [SHIFT] #* >*i¥L"CT$V>
»Factory Preset
Load factory preset data.
I»Bftt«i:Ltto
12

May. 1996 MC-303
Factory Preset/ 7tVV-•7° Uir vK
Turn on the power while pressing [SHIFT] button.
The following display will appear, and press
[ENTER] button to execute.
lXf(Dl i\Z^i^tlii'(DX\ [ENTER] #* >~C1
CURRENT MNEXT
SONG
PATTERN BEAT STCPREC
Check up Version and Battery Voltage/
Check up version and battery by following
operation in normal mode.
•Program ROM version
=> Press [R(BD)] button with [SHIFT] and
[SCALE] buttons.
.7°n jf? AROM ^- va>
=> [SHIFT] t[SCALE] #9 >£#L£#*
?>, [R(BD)]sK^> 3Srff1"o
CURRENT
nI
NEXT
mm
SONG
PATTERN BEAT STEPREC
Data ROM version
=> Press [3(CLP)] button with [SHIFT] and
[SCALE] buttons.
T-9 ROM/^ya >
=> [SHIFT] t[SCALE] #* >*#L£#
?>, [3(CLP)]*^^*ff1"o
Voltage of battery
=> Press [5(TOM/PERC)] button with
[SHIFT] and [SCALE] buttons.
=> [SHIFT] t[SCALE] *** >£#L&#*
£>, [5(TOM/PERC)] *K* >£#1~o
13

MC-303 May. 1996
Bulk Dump/MVl/? •#>7°
•Recording MC-303 data/MC-303 (Df- ££$#f5
Connect MC-303's MIDI-OUT to the external sequencer's
MIDI-IN with MIDI cable.
MC-303 (D MIDI-OUT t^M^-'r >^0 MIDI-IN £
MIDI ^r -7;l/"C«« Llto
With pattern and song playback halted, hold down [SHIFT]
and [FUNC] and press [KEYPAD 16] to access the Bulk
Dump execute display.
The following display will appear.
>**->, vyytfWikltzmWXs [SHIFT] t[FUNC] i
#L&^[KEYPAD 16] £ffLT\ 'VV9 *9>7<n%$f
curreistt
BEl-l
NEXT
9
SONG
PATTERN BEAT STB»REC
Begin realtime recording on the external sequencer.
Press [ENTER] on the MC-303, and the data will be
transmitted from MIDI-OUT.
While data is being transmitted, the following
display will appear.
MC-303 '<D [ENTER] iWt t,MIDI-OUT fr hf- 9
CURRENT
EB MNEXT a
SONG
PATTERN BEAT EPREC
After awhile, the following display will appear,
and data transmission will pause. Press [ENTER]
button to send the next bulk data.
MC-303's bulk data is so big that the low memory sequencer
(ex.MC-50) can't receive all data at once.
When all data transmission is completed,
the following display will appear, and then
the normal display will automatically reappear.
[ENTER] ** 9yiffl Lii~o
MC-303<D/*)1'9 •r-9i£#'%\iZ-k£\,*tzib^ ^'J
#*0^4v^>-^>-9— (MC-5030 TN±-flE££
xwi>9 -r-9*'§:rthtL%^Wi/ktf$) }
oito
CURRENT
BEMNEXT
SONG
PATTERN BEAT STEP FCC
CURRENT
EBMNEXT an
SONG
PATTERN BEAT STtPREC
Stop realtime recording on the external sequencer.
14

May. 1996
•Returning data to the MC-303/x —£%MC-303 \Z.W$
MC-303
Connect MC-303's MIDI-IN to the external sequencer's
MIDI-OUT with MIDI cable.
MC-303 CO MIDI-IN fc^SRv- ^>^(D MIDI-OUT £
MIDI >r -7>-Cg$c Ltto
With pattern and song playback halted, hold down [SHIFT]
and [FUNC] and press [KEYPAD 16] to access the Bulk
Dump execute display.
Press [SEL R], and the MC-303 will begin waiting to receive
abulk dump.
The following display will appear.
v**->\ Vy7il^)kLtz®MX\ [SHIFT] t[FUNC] £
ff L£**£[KEYPAD 16] SrffLT, WW •yy?<D%ft
[SELR]£#tt, wv? •yyy^&m^mm^m
^SbOito
•7*4 X7 WtKi^co <fc 9icft^^tiifo
Operate the external sequencer to begin playback.
The data will be transmitted from the sequencer.
The following display will appear on the MC-303, and the
data will be loaded into memory.
^i^-^>^-£»#L-C MC-303 m<r>T-9* 7°
WLito
v->ry*r-frhr~-?i]v MtztL%-to
MC-303 <d 7*4 x7° ]/ 4\z:fc<n i-5 ^S^$*u f- *
CURRENT
1
NEXT
SONG
PATTERN BEAT STiPfCC
When the data has been completed transmitted from the
sequencer, return to the waiting to resive.
After all datas have been completed transmitted from
sequencer in order of making, press [EXIT] button to return
to the normal mode.
ffr&B# t|W| U.HH#t?^N';l/^ •T'- 9iMC-303 ^m
Lfc&, [EXIT] *K> >Tm^^- F^So tTJv>o
15

MC-303 May. 1996
aW1to 15 id 17 18 13
CIRCUIT BOARD/StSEKMAIN)
El
D
|NQTE |
,:
Replacement MAIN BOARD ASSY does not include the
Lithium Battery.
Because lithium battery does not use for the backup of factrory
presets.
Order proper the lithium battery separately if necessary.
MAIN BOARD ASSY kUUlf £*LtV& Uf"> A^jfeli,
12569249S0 Lithium Battery CR2032
ASSY 70788589
(
v
Apparatus containing Lithium batteries
ADVARSEL!
Lithiumbatteri -Eksplosionsfare ved
fejlagtig handtering.
Udskiftning ma kun ske med batteri af
samme fabrikat og type.
Lever det brugte batteri tilbage til
leverandoren.
VARNING!
Explosionsfara vid felaktigt batteribyte.
Anvind samma batterityp eller en
ekvivalent typ som rekommenderas av
apparattillverkaren.
Kassera anvant batteri enligt
fabrikantens instruktion.
ADVARSEL!
Lithiumbatteri -Eksplosjonsfare.
Ved utskifting benyttes kun batteri som
anbefalt av apparatfabrikanten.
Brukt batteri returneres
apparatleverandoren.
VAROITUS!
Paristo voi rajahtaa, jos se on
virheellisesti asennettu.
Vaihda paristo ainoastaan
laitevaimistajan suosittelemaan
tyyppiin. Havit§ kaytetty paristo
valmistajan ohjeiden mukaisesti.
-
\3k
K
^Sth <QY
16

MC-303 May. 1996
i&1i20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 36 36 37 38 33 4C
CIRCUIT DIAGRAM/Bli&0(MAIN)
P
A
N
E
L
B
O
A
R
D
CQNTRQI Bl JS
CN2
52147-1010
1
2
3
4
5
7
a
9
10
1VRO
2VR1
3VR2
4VR3
5VR4
6VR5
7VR6
10 [°f
MUX7 4
MUX6 2
MUX5 5
MUX4 1
MUX3 12
MUX2 15
MUX1 14
MMXQ 13
EXBA10E 22K
EXBMOE 22K
RA4
EXBA10E 22K
24 .OOOMHZ
MAIN BOARD
ASSY 70788589
(PWB 01013134) 17

MC-303 May. 1996
6
CIRCUIT BOARD/K«HI(PANEL)
ASSY 70788623
ASSY' 70788623
rvrf
^±D51
/
046 -M-
LED40ri>h00 1
=£035
2:^
tt
i i
CNJ
LVV
SW36 -
J13<5
J135
\
1234 5
678910
LED57
10
cf
\^^/
>F? y^
o^o *o^o
LED41I
J116
m&i
s&
LED42
•V7 |/T^7 «^V7
77) *\ (Tvi -i Cc?\
«i
SUK8
r»h
D48
(N{
SU49
LED51
2^D49
J143
J141
§®
CIO
<7^
JLE052
2JSD50 CI 2Vl^ GND3
La§3
SU50 C8 SU51
col |(Ni
i2h!
*
D4?
(N, J134
-J133"
^J£i LED35 »LED36 LED3?
jJ»^w* ^n^ ^* x-v* -^v^LE039
J
r£h rWn rWn r£h r£h
_J1_1?__
J114
SW45
D45
D36
SUK6
View from components side.
18

MC-303 May. 1996
CIRCUIT DIAGRAM/EH&I1(PANEL)
SR SR A
ETNTG
NNONN
DRLLD
DD VVVVVVV
+GRRR RRR R
5N 2345676
VD
DX5 CN3
51048-0500 REM5
SW18
TAP
77?0
TAP
ENC1
ENC2
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SDO
DIR
rll-
RKO9L120
777q 77?D
0987654321
C15
110/ 16
7t?o
SOURCE DRIVER
(LOW INPUT ACTIVE)
12 R02
I1D01
RK09L1 14
10/16
7t7d
10/ 16
DX5
H
5104B-1200
7t7q
03 0.1
7t7d
DX5
A7 CB7
A6 CB6
FG
GN
DIR D
7t7d
LED (HiZ)
SW (A<-B)
11 V01
12 C02
Ik
18
^IC2
TD62384AP
7t7u
SINK DRIVER
CLOW INPUT ACTIVE)
D£5 o. 1C2
IC4
TD62384AP 777*0
392
=10 3
>11 4
>12 5
?13 6
?14 7
15 8
11 V01
12 C02
IC5
74HC138
PANEL BOARD
ASSY 70788623
(PWB 01013256)
7f7u
10/16
7t7d
10/ 16
7t?q
7f7o
1CI/ 16
7t7d
Tt7o
10/ 16
777 o
777d
10/ 16
mu
D35
SW36
D2 4-
SW2 T
RTHM MUTE
^2
KEY (2)
D31
SW33
PART MUTE
D23
SW25
PLAY MODE
SW1
SHIFT
PORTAMENT
D51
SW52
D25
SW29
2£
iBb ffl5IIli Eli Hk IE 2151914
AAA BBB
12 3i23
COM1A
C0M1B
COM2
COM3
FFF GGG DDD
123 123 PPP
123
RIGHT SIDE
^
51116 UlO|5 UlBP I2I7I1 11 IS IQ /7l,
2|5|9|4
FFF GGG DDD
123 12 3PPP
123
COM2
COM3 LEFT SIDE
ENVELOPE
OCTAVE +
^2
KEY (5)
5(TOM/PC)
D20-
SW22 '
m
^
SW9
J-o^o2—
KEY (8)
LED59
*2
^
LED40
^"2j
1^^ <^
PART SEL
W
LED24
m^
•w
w
^
w
RTHM MUTE
i^K
^
^
^
LED33
*®
PART MUTE
W
LED58
^2
^
TRANSPOSE
*3F
LED1 1
^
LED51
-*2
PORTAMENT
W
LED44
~-»-*2
^F
LED31
^
LED12
»,»2
i^.
^
^
o^
W
^
LED 18 ^
LED29
^2
^
LED5S
*-*2l
i^>2j ,^g£
^
LED22
^2
^
W
KEY (10) KEY (11) KEY (12) KEY (13)
v—yIm\
W
LED47
~^2
^
RPS
SET
^
LED54
*2
m
w
7(OTHERS)
LED26
*2
^
STEP REC
W
LED16
—!^2
W^
KEY (12) KEY (13) KEY (14) KEY (15) KEY (16) KEY (9)
LED1-16 :SLR-55VC
LED24 :SLR-55MC (green)
LED29 :SLR-325MC (green)
LED17-20. 35-39, 54-57 :LNJ282RKRXE
OTHER LED :SLR-325VC
777d
19

MC-303 May. 1996
CIRCUIT BOARD/StSIKJACK)
ASSY 70788634
_isi_ -«?>-
wo MC-303 JACK BOARD 1234b
678910
View from components side.
20