Roland ep-77 Operating and maintenance manual

DISASSEMBLY
SERVICE NOTES
Issued by RES
First edition
SN00032 K6018369 Printed in Italy (AC00) (AD) Copyright © 1999 by ROLAND CORPORATION
All rights reserved. No parts of this publication may be reproduced in any form whithout the written permission of ROLAND CORPORATION.
EP-77
Dec, 1999
1
SPECIFICATION
KEYBOARD
76 Weighted Keys with Touch-Sensitivity
KEYBOARD MODE
Whole, Layer
MAX. POLYPHONY
64 Voices
TONES
8 Tones with layer possibility
(Piano1, Piano2, E.Piano, Vibraphone, Harpsichord, Organ,
Strings, Choir ).
MASTER TUNING
Keys Tuning (0.1Hz Steps) 415.3Hz ~ 466.2Hz
TRANSPOSE
Key Transpose (-6 ~ +5 Semitone step)
EFFECTS
Reverb(On/Off)
Chorus (On/Off)
METRONOME
Beat: 0, 2, 3, 4, 6
Volume: 8 levels
Sounds: 3 types
TRACKS
1 Track
SONG
1 song
NOTE STORAGE
Approx. 5,000 notes
TEMPO
Quarter note = 40 ~ 208
RESOLUTION
96 ticks per quarter note
CONTROL
Play/Stop, Rec, Tempo
RATED POWER OUTPUT
5W x 2
SPEAKERS
12cm x 2
CONNECTORS
Output Jacks (L/Mono, R)
Input Jacks (L/Mono, R)
Pedal connector x 2 (Damper, Soft )
Headphone Jack x 2 (Stereo)
MIDI In Connector, MIDI Out Connector
POWER SUPPLY
ACO - 12V 1A AC-Adaptor
POWER CONSUMPTION
1000mA
DIMENSIONS
1138(W) x 339 (D) x 108 (H) mm (without music stand)
1144(W) x 370 (D) x 767 (H) mm (with music stand)
WEIGHTS
10,5 Kg. (without music stand)
19,4 Kg. (with music stand)
SUPPLIED ACCESSORIES
AC-Adaptor
Owner's Manual
Pedal Switch (DP 2)
(See Parts List on page 5-6)
OPTIONS
Music Stand KS-EP-77
TABLE OF CONTENTS Page
SPECIFICATIONS 1
LOCATION OF CONTROLS 2
EXPLODED VIEW 3
KEYBOARD PARTS LIST 4
STAND EXPLODED VIEW KS-EP-77 4
PARTS LIST 5/6
BLOCK DIAGRAM 7
PHONES PCB ASSY & CIRCUIT DIAGRAM 8
JACK PCB ASSY 8
CIRCUIT DIAGRAM JACK PCB ASSY 9
BEAT & TEMPO PCB ASSY & CIRCUIT DIAGRAM 10
MAIN PCB ASSY 10
CIRCUIT DIAGRAM MAIN PCB ASSY 11
CONTROL PCB ASSY & CIRCUIT DIAGRAM 12
RIGHT CONTACT PCB ASSY w/RUBBER CONTACT & CIRCUIT DIAGRAM 13
LEFT CONTACT PCB ASSY w/RUBBER CONTACT & CIRCUIT DIAGRAM 13
TEST MODE 14/15

Power
LL RR
Input Output
Soft
DamperPedal
In
Out MIDI
Adaptor Only
Use Roland ACO
1000 mA
DC IN 12V
Mono
Stereo Mono
Stereo
N225
THIS DEVICE COMPLIES WITH PART 15 OF FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO
CONDITIONS:(1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2)THIS DEVICE MUST ACCEPT
ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION
"THIS CLASS (B) DIGITAL APPARATUS COMPLIES WITH
CANADIAN INTERFERENCE-CAUSING EQUIPMENT REGULATIONS"
"CET APPAREIL NUMERIQUE DE LA CLASSE (B) RESPECTE LE
REGLEMENT SUR LE MATERIEL BROUILLEUR DU CANADA"
Reverb Chorus Piano 1 Piano 2 E. Piano Vibra-
phone Harpsi-
chord Organ Strings Choir Sound On/Off Play Rec Demo
Min Max
Volume
Power
Tempo Metronome Beat
0
40
60
80
96 108
208
192
168
144
120 234
6
å¯ñöë
2-BUTTON GROUP8x8(TRASPARENT)
2-BUTTON GROUP8x8(TRASPARENT)
BLACK KNOB W/IVORY POINTER
BLACK KNOB W/IVORY POINTER
LED DIODE TLHG4401 - GREEN Cod.15029320RI
LED DIODE TLHR4401 - RED Cod.15029284RI
LED SPR - 325 MVWT31
Cod.01121689
POWER SWITCH KNOB N. 001-BLACK5P DIN SOCKET YKF51-5054 (2PCS) JACK SOCKET HLJ7101-01-3010 DC SUPPLY SOCKET HEC 2305-01-230
2-BUTTON GROUP 12x8 (BLACK)
2-BUTTON GROUP 12x8 (BLACK)
Cod. K2478285
Cod. K2478285
D. 12 H. 16,5 Cod. K2478287
D. 12 H. 16,5 Cod. K2478287
Cod. 22488183Cod. 13429825 Cod. 13449283 Cod. 13449726
Cod. K2478286
Cod. K2478286
LED DIODE TLHR4401 - RED
Cod.15029284RI
BLACK KNOB W/IVORY POINTER
D. 12 H. 16,5 Cod. K2478287
ROT. POT. 10KB 14K 1230
Cod. 00459901
ROT. POT. 11MMRK 11K1140
Cod. 01897245
ROTARY SWITCH SRBV15-F0820-11
Cod. 01897234
2
EP-77 Dec, 1999
LOCATION OF CONTROLS
REAR VIEW

3
EP-77
Dec, 1999
EXPLODED VIEW
9
2
2
8
1
3
5
6
10
12
13
13
11
14
7
4
No. Part No. Description
17711507000 VARN+SILK. TOP CABINET
2
3
K2198107 PLASTIC MUSIC REST
4
7711508000 VARN+SILK. SOCKET SUPPORT
57711501000 MAIN PCB ASSY
6
77711503000 BEAT & TEMPO PCB ASSY
8
7711504000 HEADPHONE PCB ASSY
9
10
11 K2268157 VIBRATION DAMPER PL 45 (SHORT)
12 7697607000 76-KEYBOARD ASSY TP/9P
13
14
SPEAKER 4 OHM 120.20B/FX
FELT WASHER I/D 7 E/D 13 TH. 1,5
K2418103
K2248150
7711505000 JACK PCB ASSY
K2268156
K2248125
7711502000
ANTIDUST COVER PL 45
GRILL F/LOUDSPEAKER
CONTROL PCB ASSY
A
A
B
BB
C
C
C
G
C
D
E
F
A
B
C
D
E
F
G
J2289112
J2289115
J2289108
J2289125
J2139102
J2289102
J2289113
(SCREW)
SCREW 3,5x13 TCTC H.8 BRUN.
SCREW 3,5x9,5 TC PR TFR H.8
SELF LOCK. SCREW M3x10 TCTC H.6
SCREW 2,9x10 TCTC PR TROP
TOOTHED WASHER I/D 3
SELF TAP. SCREW 2,9x10 TCTC
NUT 3MA H.3

4
EP-77 Dec, 1999
KEYBOARD PARTS LIST 76 KEY TP/9P KEYBOARD ASSY (7697607000)
11
Ref
1
2
3
4
5
6
7
8
9
10
11
*
PARTS NAME
KEY SPRING gr.63
NATURAL KEY C5 (gr.10) DO
RE
MI
FA
SOL
LA
SI
MI(I)
SOL(F)
NATURAL KEY D6 (gr.10)
NATURAL KEY E7 (gr.10)
NATURAL KEY F1 (gr.10)
NATURAL KEY G2 (gr.10)
NATURAL KEY A3 (gr.10)
NATURAL KEY B4 (gr.10)
NATURAL KEY C8 (gr.10)
NATURAL KEY G (gr.10)
MATT SHARP KEY (gr.10)
SELF TAP SCREW 2.9x8 TCTCPRBZ
12P RUBBER CONTACT
LEFT CONTACT BOARD W/RUBBER ASSY
RIGHT CONTACT BOARD W/RUBBER ASSY
PLASTIC CHASSIS
GUIDE BUSHING INFERIOR
GUIDE BUSHING SUPERIOR
1P CONDUCTIVE RUBBER LR 13/1
CONTACT BOARDS ARE COMPLETE WITH RUBBER CONTACTS
PARTS NUMBER n.
J2179101 76
6
6
6
7
6
6
6
1
1
31
42
7**
1
1
1
76
76
1
J2579112
J2579113
J2579114
J2579115
J2579116
J2579117
J2579118
J2579119
J2579121
J2579193
J2289104
2218523802
7695005000
7695004000
J2589101
J2359104
22158789
7625920000
1
2
3
8
10
9
PM
SM
5
76
4
*CONTACT BOARDS ARE COMPLETE WITH RUBBER CONTACTS
*
SOL
MI
76 KEY KEYBOARD (WEIGHTED)TP9-P
12 P RUBBER CONTACT
C
C
B
B
A
A
C
D
DC
CC
LEFT
RIGHT
** CUT AND ASSEMBLY OF RUBBER CONTACTS
PART LIST
No. Part No. Description
1K1128121 RIGHT SIDE FRAME
2
3
K235810101 FOOT F/SIDE PANEL (STAND)
4
K1148140 REAR CROSS BAR 1072 mm
5K2128113 KEYBOARD HINGE CHASSIS
6
7J2289186
SCREW 3,5x16 TC PR TFR BRUN
8SCREW DRIVER TYPE 2
J2329101
K1128122
J2329107
LEFT SIDE FRAME
JOINT BOLT ASSY
1
6
4
3
6
6
82
4
5
7
6
STAND EXPLODED VIEW & PARTS LIST (KS-EP-77)

EP-77
Dec, 1999
5
15189189 I.C. UPC 4570HA VERT. (OP.AMP.) IC7 on JB
15199904 I.C. M51953 BL (STANDING) IC5 on JB
A01451578 I.C. DAC AK4324-VF-E2 IC18 on MB
A01898334 I.C. PQ05RD11 REGULATOR) IC6 on JB
A01670890 I.C. PQ3DZ53U (REGULATOR) IC8 on MB
A01901012 I.C. PQ05DZ11 (REGULATOR) IC21 on MB
A00562601 I.C. LA4705 (POWER AMP) IC3 on JB
# K525815910 I.C. K525815910 EP77/97 IC10 on MB
TRANSISTOR
15129114 TRANSISTOR 2SC-1815GR Q8 on JB
15129136 TRANSISTOR 2SC-2878-A/B Q2, 3 on JB
15129602 TRANSISTOR 2SD-667C Q7 on JB
15129164 TRANSISTOR DTC-114ES Q4, 5 on JB / Q106, 107, 108 on CB
15119163 TRANSISTOR RN2227 Q101, 102, 103, 104, 105 on CB
00898201 TRANSISTOR RN2421 CHIP Q1 on MB
A15119141 TRANSISTOR DTA-114 ESATP Q1 on JB
DIODE
15019159RI DIODE 1N-4148 D101-115 on CB / D1-64 on LCB / D65, 152 on RCB
A15119126 DIODE 1SS-133T REDUCED PITCH D1-14, D14 on JB
A00019356 DIODE 1SR139-400 T-32 D10, 12 on JB
A01905134 SCHOTTKY DIODE MA7D49 D13 on JB
15029320RI LED DIODE TLHG4401 - GREEN LED106 on CB
15029284RI LED DIODE TLHR4401 - RED LED101-105 on CB
A01121689 LED SPR-325MVWT31 LED107 on CB
RESISTOR
15399965 RESISTOR ARRAY RCE9A-103-JA RA13 on MB
J3919108 RESISTOR ARRAY EXB-V8V-103-JV RA3, 5, 6, 8 on MB
00126101 RESISTOR ARRAY EXB-V8V-221-JV RA2, 7, 9, 10, 11 on MB
00346690 RESISTOR ARRAY RCE9A-682-JA RA16, 17, 18 on MB
13819132RI UNINFL.RES. 100 OHM 0.6W 5% R1, 2, 4, 5, 12, 13, 15, 16 on PB
A01783623 RESIST. 5025 10 OHM1/2W 5% R30 on MB
A15399989 RESIST. 5025 68 OHM1/2W 5% R65 on MB
POTENTIOMETER
00459901 ROT. POT. 10KB 14K 1230 VR1 on CB
A01897245 ROTARY POT 11M/M RK 11K1140 VR101 on BTB
CAPACITOR
J3469156 ELECTR. COND. 33U 16V P.5 C23, 24, 31, 38, 39, 46, 48, 52 on JB
J3629122 ELECTRL.COND.-V 1000UF 25V C26, 33, 41, 59 on JB
J3629103 ELECTRL.COND. 100U 25V P5 C47, 53, 61, 62 on JB / C1, 2, 6, 7 on PB
J3629104 ELECTRL.COND. 10U 50V P5 C56 on JB
# J3629154 ELECTR.CAPACIOR 3.38 50V P.5 C11, 14 on JB
J3629107 ELECTRL.COND. 1UF 100V P5 C32, 50 on JB
J5369103 ELECTR. COND. 100U 16V (SMD) C117 on MB
J5369104 ELECTR. COND. 10U 16V (SMD) C13, 16, 45, 48, 54, 78, 81, 92, 101, 104, 107,110, 115 on MB
J5369105 ELECTR. COND. 33U 16V (SMD) C74, 82, 103, 109 on MB
J3629149 ELECTR.COND. 100U 16V H.7 C102 on CB
J3629140 ELECTR. COND. 0.33U 63V H.7 C108 on CB
INDUCTOR, COIL, FILTER
<<EMI>> 12449382RI NOISE SUP. PLT1-R53C FL1 on JB
<<EMI>> 12449380 NOISE SUP. EXC-ELDR. 25V L1, 2, 4, 6 on PB
<<EMI>> 12449355 NOISE SUP. FBR07H850TB00 L3, 5, 7 - 11 on JB
CRYSTAL, RESONATOR
00894034 QUARTZ 16.000 MHZ MA-406 X1 on MB
00901912 QUARTZ 24.576 MHZ MA-406 X2 on MB
CONNECTOR
13419677RI 16P FEM. CONNECTOR AMP 1.27 CN5 on MB / CN1 on LCB
13369689RI 20P FEM. CONNECTOR AMP 1.27 CN6 on MB / CN2 on RCB
J3439112 2P MALE CONNECTOR P 2.5 M CN4 on JB
J3439120 4P MALE CONNECTOR P.2 M CN4 on MB
J3439121 6P MALE CONNECTOR P.2 M CN6 on JB / CN102 on CB
J3439125 5P MALE CONNECTOR P.2 M CN3 on JB
J3439141 10P MALE CONNECTOR P.2 M CN3 on MB / CN101 on CB
J3439146 11P MALE CONNECTOR P.2 M CN8 on MB / CN1 on JB
J3439148 7P MALE CONNECTOR P.2 M CN2 on MB / CN2 on JB / CN5 on PB
# J3439171 4P MALE CONNECTOR 90° P.2 M CN103 on BTB
PARTS LIST EP-77 (117V/230V/230VE)
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 description will result in delayed or
even undelivered replacement.
CONSIDERATION ON PARTS ORDERING
NOTE:
#The parts marked " #'' are new (Initial Parts).
AThe parts marked " A'' are new (Initial Parts).for RES but already used by RJA
The parts marked have Safety - Related characteristics.
Use only listed parts for replacement.
<< EMI >> Component for EMC.
Note
:Replacement should be made on a unit basis. No replacements available for individual parts.
Replacement only be a unit.
!
!
SAFETY PRECAUTIONS :
The parts marked have
safety-related characteristics.
Use only listed parts for
replacement.
!
MB = Main Board
JB = Jack Board
LCB = Left Contact Board
RCB = Right Contact Board
CB = Control Board.
BTB = Beat & Tempo Board
HB = Headphone Board
CASING Q.ty
# 7711506000 VARNISHED BOTTOM EP-77
# 7711507000 VARN+SILK. TOP CABINET EP-77
# 7711508000 VARN+SILK. SOCKET SUPPORT EP-77
K2248125 GRILL F/LOUDSPEAKER
# K2198107 PLASTIC MUSIC REST EP-77/97
KNOB BUTTON
# K2478287 BLACK KNOB W/IVORY POINTER D.12 H.16.5 3
# K2478285 2-BUTTON GROUP 8X8 (TRANSPARENT) 3
# K2478286 2-BUTTON GROUP 12X8 (BLACK) 5
22488183 POWER SWITCH KNOB N.001-BLACK 1
SWITCH
A01676512 PUSH SWITCH SDKLA1-B SW1 on JB
J3169105 SWITCH TP-1101A / EVQ-PAE 05 R SW101-115 on CB
A01897234 ROTARY SWITCH SRBV15-F0820-11 SW116 on BTB
JACK, SOCKET
13449726 DC SUPPLY SOCKET HEC 2305-01-230 JK8 on JB
13449252 JACK SOCKET YKB 21-5006 JK9, JK10 on JB
13449283 JACK SOCKET HLJ7101-01-3010 JK2, 3, 4, 5, 6,7 on JB
13429825 5P DIN SOCKET YKF51-5054 (2PCS) JK1 on JB
SPEAKER
K2418103 SPEAKER 4 OHM 120.20B/FX
KEYBOARD ASSY
7697607000 76-KEY KEYBOARD ASSY TP/9P
NOTE: For details, refer to KEYBOARD PARTS LIST (Page 4)
PCB ASSY
# 7711502000 CONTROL PCB ASSY EP-77
# 7711503000 BEAT & TEMPO PCB ASSY EP-77
# 7711504000 HEADPHONE PCB ASSY EP-77/97
# 7711505000 JACK PCB ASSY EP-77/97
# 7711501000 MAIN PCB ASSY EP-77
7695004000 RIGHT CONTACT BOARD W/RUBBER ASSY
7695005000 LEFT CONTACT BOARD W/RUBBER ASSY
IC
15229718RI I.C. 6N137 PHOTO-COUPLER IC2 on JB
A01897256 I.C. LHMN5RW MASK ROM IC12 on MB
A01786667 I.C. HD6413006F20 FLAT IC6 on MB
15169547RI I.C. 74 HC 08 DIP CMOS IC102 on CB
15169550RI I.C. 74 HC138 DIP CMOS IC101 on CB
15249111 I.C. TC7WU04 F FLAT CMOS IC13 on MB
00232645 I.C. TC7W14F FLAT IC20 on MB
00129278 I.C. SSC1080 FOB (CUSTOM IC) IC16 on MB
J5259110 I.C. HM62256LFP-7T FLAT SRAM IC5, 7 on MB
01126612 I.C. TC514260DJS-60 FLAT IC14 on MB
A01679978 I.C. RA09-002 (XP6) CUSTOM IC9 on MB
15259884 I.C. TC7S08F MOS CMOS IC19 on MB
J5169106 I.C. 74LS04 TTL IC1 on JB
15189250 I.C. M5218 AL (STANDING) IC4 on JB
15289105 I.C. UPC 4570G (OP AMP) IC17 on MB
E

EP-77 Dec, 1999
6
WIRING, CABLE
# K3468211 2P CABLE (100) -1C From CN4 on JB to SPEAKERS
K3468159 16P FLAT CABLE ASSY (72) -2C From CN5 on MB to CN1 on LCB
K3468162 20P FLAT CABLE (56) -2C From CN6 on MB to CN2 on RCB
# 7711509000 4P CABLE ASSY (18) -2C P.2 D/D From CN4 on MB to CN103 on BTB
# 7711510000 2P COAXIAL CBL ASSY (20) -2C P.2 D/R From CN6 on JB to CN102 on CB
# 7711511000 7P CABLE ASSY (68/60) -2C P.2 From CN3 on JB to CN5 on PB + Left Speaker
# 7711512000 7P CABLE ASSY (28) -2C P.2 D/R From CN2 on MB to CN2 on JB
# 7711513000 10P CABLE ASSY (24) -2C P.2 D/R From CN3 on MB to CN101 on CB
# 7711514000 11P CABLE ASSY (16) -2C P.2 D/R From CN8 on MB to CN1 on JB
SCREW
J2289122 SCREW 2.2X6 TC TC BRUN 2
J2289102 SELF TAP.SCREW 2.9X10 TC TC 7
J2289125 SCREW 2.9X10 TC TC PR TROP 36
J2289131 SELF TAP.SCREW 3.5X16 TCTCPRBZ 37
J2289118 SCREW 2.9X16 TC TC PR BRUN 2
J2289108 SELF LOCK.SCREW M3X10 TCTC H.6 2
J2289109 SELF LOCK.SCREW M4X14 TCTC H. 9.5 2
J2289115 SCREW 3.5X9.5 TC PR TFR H.8 14
J2289112 SCREW 3.5X13 TCTC H.8 BRUN 4
J2289113 NUT 3MA H.3 2
PACKING
K2638171 RIGHT POLYST. END-SIDE EP-75 1
K2638172 LEFT POLYST. END-SIDE EP-75 1
K2678105 CARTENE ENVELOPE HD 140X57 1
K2678106 POLYETH.ENVELOPE 4OX55 1
# K2618213 OUTER PACKING EP-77 1
MISCELLANEOUS
K2268128 RED FELT MM. 1250X7X1 1
# K2268156 ANTIDUST COVER PL45 EP-77/97 1
# K2268157 VIBRATION DAMPER PL45 (SHORT) EP77/97 1
# K2248150 FELT WASHER I/D 7 E/D 13 TH.1.5 3
1342982301 POWER SUPPLY SOCKET HOLDER N°2 1
J2139102 TOOTHED WASHER I/D 3 2
K2168102 SPACER FOR LED H.2.8 D.E. 5.5 5
K2168105 SPACER F/LED H.12 HEX. 1
# K2168114 LED SPACER H.1.8 E.D.9 1
J2359101 SPACER 3M ART. SJ5012 4
ACCESSORIES
# K6018361 O.MANUAL (IT/E/D/SP/OL) EP-77/97 1
7710610000 PEDAL DP-2 1
K2448106 POWER ADAPTOR ACO 230V 12V 1A for (230V) 1
K2448107 POWER ADAPTOR ACO 230VE 12V 1A for (230VE) 1
K2448109 POWER ADAPTOR ACO 120V 12V 1A for (117V) 1
!
!
!
PARTS LIST STAND KS-EP-77
CASING Q.ty
K235810101 FOOT F/SIDE PANEL (STAND) 2
K1128121 RIGHT SIDE FRAME (2ND VERSION) 1
K1128122 LEFT SIDE FRAME (2ND VERSION) 1
K1148140 REAR CROSS BAR 1072 MM. (2ND VERSION) 1
SCREW
J2289186 SCREW 3.5X16 TCPR TFR H.8 BRUN 4
J2329101 SCREW DRIVER TYPE 2 1
J2329107 JOINT BOLT ASSY 4
PACKING
K2638134 RIGHT POLYST. END-SIDE 1
K2638135 LEFT POLYST. END-SIDE 1
K2638136 MIDDLE POLYST. END-SIDE 1
K2668102 CARTON PLATE MM. 1440X440 1
# K2618215 OUTER PACKING KS-EP-77 1
MISCELLANEOUS
K2128113 KEYBOARD HINGE CHASSIS 2
ACCESSORIES
# K6018362 ASSEMBLY INSRUCTIONS KS-EP-77 1

A
B
C
D
E
F
G
H
I
L
M
N
O
P
Q
R
S
T
U
J
K
12345678910 12131415161718192021222324252627282930
7
11
EP-77
Dec, 1999
BLOCK DIAGRAM
BEAT & TEMPO BOARD
1
4
2
5
31
4
2
5
3
3 1 2 3 1 2
12 1
2
3
1 2 4 1 2 4 1 2 4 1 2 4
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SW116
1 10
2 3 4 5 6
7
8
9
VR101
4
1
2
3
AVCC AMP POWERD+5V
LED+SW
MATRIX
SRAM CPU
AAADD D
ADDRESS BUS
DATABUS
IP OP
A
ED
EA
ED
AD
WA
WD
XP A
D
WAVE ROM
KEY SCAN
AD
D/A
DATA
LOUT
ROUT
LPF
CONTROL BOARD
MAIN BOARD
TMKBK
MIDI INMIDI OUT
L/M R
OUTPUT
R
LIC4
RESET
JACK BOARD
IC5,IC7 IC10
IC6
IC14 IC9 IC12
IC16 IC18 IC17
AA
MASTER
VOLUME
PHOTOBUFFER
Q1
IC2
76 KEY KEYBOARD ASSY
PS RAM
RAS
UCAS
WE
RAS
CAS
EWE
IC5
POWER
IC6,Q7
-
SWITCH
DCIN
12V 1A
POWER
SUPPLY +
DAMPER SOFT
JK2 JK3
INPUT
L(MONO) R
AMPL
JK5 JK4
EQ.
IC7
MUTE
CONTROL
MUTE
MUTE
Q2
Q3
A
Q4,Q5,Q8
IC3A
BRIDGE
AMPL.
RIGHT
LEFT
4 Ohm
4 Ohm
IC3B
BRIDGE
AMPL.
L-
L+
R+
R-
SPEAKERS
PHONES
A
L
R
PHONES BOARD
BEAT
TEMPO
AD BEAT
AD TEMPO
JK7 JK6
Ic21 Ic8
AVCC A+5V +5VD +3.3VD
IN INOUT OUT
4M-MASK Q
Q
1
2
4M-FLASH
Note
Q
Q
1=
2=
Mass Production
Develop.-Pre Product.

A
B
C
D
E
F
G
H
I
L
M
N
O
P
Q
R
S
T
U
J
K
12345678910 12131415161718192021222324252627282930
8
11
EP-77 Dec, 1999
PHONES PCB ASSY & CIRCUIT DIAGRAM ASSY 7711504000
JACK PCB ASSY ASSY 7711505000
View from component side
View from component side
JK9
YKB21-5078
1
2
3
4
5
6
7
8
9
JK10
YKB21-5078
1
2
3
4
5
6
7
8
9
C6
100/16
21
C7
100/16
21
C1
100/16
21
C2
100/16
21
R1 100I
R2 100I
R5 100I
R4 100I
R12 100I
R13 100I
R16 100I
R15 100I
L6
L4
L1
C10
100nFC
L2
CN5
53014-0710
11
22
33
44
55
66
77
To JACK/AMP BOARD (CN3)
L+ SEND-H
L- SEND-H
R+ SEND-H
R- SEND-H
AGND
L+ SPK
L- SPK
PHONES

A
B
C
D
E
F
G
H
I
L
M
N
O
P
Q
R
S
T
U
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9
11
EP-77
Dec, 1999
CIRCUIT DIAGRAM (JACK PCB ASSY)
JK2
HLJ7101-01-3010
1
2
4
JK3
HLJ7101-01-3010
1
2
4
L3
FBR07HA850TB-00
L5
FBR07HA850TB-00
J1
JUMPER
JK1
YKF51-5054
12 14 15 22 24 25
30
40
50
60
2
45
IN OUT
2
45
SW1A
SDKLA1-B
121
SW1B
SDKLA1-B
10 20
IC4C
M5218AL
84
+
-
J3
JUMPER
J2
JUMPER
Q1
DTA114ES
3
21
IC1A
HD74LS04P
12
IC1B
HD74LS04P
343
IC2
6N137
85
2
3
7
6
R8
220
R17
1K
C9
100nFC
R10
120
R11
100
D4
1SS133
12
R7
220
C4
100nFC
IC1G
HD74LS04P
14 7
IC1F
HD74LS04P
13 1213
IC1E
HD74LS04P
11 1011
IC1D
HD74LS04P
989
R3
6K8
R9
6K8
D1
1SS133
12
D2
1SS133
12
R6
1K
D5
1SS133
12
D3
1SS133
12
R14
1K
C3
10nF
C8
10nF
JK5
HLJ7101-01-3010
1
2
4
L8
FBR07HA850TB-00
L10
FBR07HA850TB-00
C13
330pF
C16
330pF
R23
68K
R26
68K
C49
100nFC
C50
1/50
21
R37
68K
R43
68K
R44
68K
R38
68K
C23
33/16
21
C31
33/16
21
C38
33/16
21
C46
33/16
21
R33
5K6
R42
10K
D7
1SS133
12
D6
1SS133
12
R48
5K6
R56
10K
D9
1SS133
1
2
D8
1SS133
12
R36
1K
R51
1K
C19
33pF
R30
10K
IC4A
M5218AL
2
3
1
+
-
R45
10K
C34
33pF
IC4B
M5218AL
6
5
7
+
-
R59
68K
R57
68K
C52
33/16
21
C51
100nFC
FL1
PLT1R53C
1
2
4
3
C57
100nFC
C58
100nFC
D10
1SR139
12
C56
10/16
21
C55
100nFC
IC6 PQ05RD11
IN
1OUT 2
OE
4
GND 3
D12
1SR139
1
2
R65
1K
C62
100/16
21
C60
100nFC
C61
100/16
21
Q7
2SD667C
3
12
C24
33/16
21
C39
33/16
21
R68
1K
R71
1K
C65
820nF
C66
820nF
R69
820
R70
820
R67
47K
C63
82nF
C67
82nF
R66
680
C64
15nF
IC7A
UPC4570HA
3
4
2
+
-
R72
680
C68
15nF R73
47K
IC7B
UPC4570HA
7
6
8
+
-
IC7C
UPC4570HA
1
59
+
-
C69
100nFC
Q4
DTC114ES
3
12
C53
100/16
21
R63
3K3
R60
100
R61
10K
D14
1SS133
12
Q5
DTC114ES
3
12
R62
10K
Q8
2SC1815GR
3
12
R64
68K
JK6
HLJ7101-01-3010
1
2
4
C12
330pF
C15
330pF
C11
3.3/16
21
R18
820
C14
3.3/16
2
1
R24
820
R20
68K
R27
68K
R21
1K
R28
1K
R19
680
R25
680
Q2
2SC2878A
3
1 2
Q3
2SC2878A
3
12
JK7
HLJ7101-01-3010
1
2
4
L7
FBR07HA850TB-00
L9
FBR07HA850TB-00
L11
FBR07HA850TB-00
J4
JUMPER
R35
4K7
C29
470pF
R40
1K
C25
680nF
R50
4K7
C44
470pF
R54
1K
C40
680nF
R58
3K3
C32
1/50
21
IC3A
LA4705
2
15
16
17
8
1
9
10
11 18
IC3B
LA4705
7
4
14
13
12
5 3 6
C47
100/16
21
C20
100nF
R47
2.2
R55
2.2
C22
100nF
R31
2.2
C28
100nF
R41
2.2
C30
100nF
C35
100nF
C37
100nF
C42
100nF
C45
100nF
C41
1000/16
21
C26
1000/16
21
JK4
HLJ7101-01-3010
1
2
4
C17
100nFC
R29
100
R22
100
C18
100nFC
C54
100nF
C59
1000/25
2
1
C33
1000/25
21
CN2
53014-0710
11
22
33
44
55
66
77
CN6
53014-0610
1
12 23 34 45 56 6
CN3
53014-0510
1
1
2
2
3
3
4
4
5
5
CN4
5045-02A
1
1
2
2
JK8
HEC2305-01-230
2
1
3
C48
33/16
21
D13
MA7D49
12
IC1C
HD74LS04P
565
IC5
M51953BL
NC 2
GND
3
RST
5
DLY 4
VCC
1
R52
3K3
C5
100nFC
CN1
53014-1110
11
22
33
44
55
66
77
88
99
10 10
11 11
AGND
AGND
AGND
OUTPUT JACK MUTE
AMP POWER
POWER AGND
OUTPUT L POWER AGND L+ SEND
L- SEND
R+ SEND
AGND
AGND
OUTPUT R POWER AGND
A-GND-
AVCC/2
XPD
Pre-SK
A-GND-
POWER AGND
Pre-SK
AGND
AMP POWER
STAND-BY
R+ RETURN
RES
RES
AVCC
AVCC
D+5V
D+5V
D+5V
D+5V
D+5V
D+5V
D+5V
D+5V
D+5V
MIDI OUT
MIDI IN
AVSS
SOFT
DAMPER
VREF
TO CN2 MAIN BOARD
SOFT
DAMPER
PEDAL
To MAIN BOARD (CN8)
R
INPUT
L(MONO)
DC IN
12V 1A
R
L(MONO)
OUTPUT
L
R
IN L
IN R
To PHONES BOARD (CN5)
TO SPK R
R+
R-
XPD-IN
SIGNAL L
AGND
SIGNAL R
A+9V
AGND
DGND
DGND
D+5V
D+5V
RES
SEND L
SEND R
RET L
RET R
AGND
AGND
To CONTROL BOARD (CN102)
(VOLUME)
AVCC/2
AVCC
AVCC
AVCC/2
AVCC/2

A
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10
11
EP-77 Dec, 1999
BEAT & TEMPO PCB ASSY & CIRCUIT DIAGRAM ASSY 7711503000
MAIN PCB ASSY ASSY 7711501000
E
View from component side
C110
100nF
C109
100nF
R114
68K
R113
100
R109
1K5
R110
1K5
R111
1K5
R112
1K5
C108
0.33/63
R115
1K
CN103
53015-0410
3
4
2
1
VR101
RK11K1140
4
1
2
3
SW116
SRBV15-F0820-11
1 10
2 3 4 5 6
7
8
9
VREF
AD-BEAT
AD-TEMPO
To CN4 Main Board
TEMPO BEAT
X
X
XX
X
X
View from component side View from solder side

A
B
C
D
E
F
G
H
I
L
M
N
O
P
Q
R
S
T
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12345678910 12131415161718192021222324252627282930
11
11
EP-77
Dec, 1999
CIRCUIT DIAGRAM (MAIN PCB ASSY)
BATTERY Backup
Flash Control
DIF0DIF1DIF2
R42 -> 0
To CONTROL B.
(CN101)
To BEAT & TEMPO B.
(CN103)
TO KEYBOARD
(LEFT)
TO KEYBOARD
(RIGHT)
To JACK BOARD (CN1)
To JACK BOARD
(CN2)
TO KEYBOARD
(LEFT)
TO KEYBOARD
(RIGHT)
FOR PA-4 KEYBOARD
FOR PA-4 KEYBOARD
MK6
MK5
BR5
MK4
BR4
MK3
MK2
MK8
MK9
MK10
MK2
MK3
MK4
MK5
MK6
MK7
MK8
MK9
MK10
MK1
BR2
BR1
MK1
T7
T6
T5
T4
T3
T2
T1
T0
T0
T1
T2
T3
T4
T5
T6
T7
BR0
MK0
MK0
BR10
BR9
BR8
BR7
BR6
BR5
BR4
BR2
BR1
BR0
BR3
BR7
BR8
BR9
BR10
XRES
XHWR
XHWR
BR6
BR3
XRES
XCS7
FLASH CT1
XHWR
FLASH CT0
XRAM
XRAM
XRAM
RTS
PA7
PA6
PA5
PA4
PA4
PA5
PA6
AD-BEAT
PA3
DATA0
PB5
PB5
PB6
PB6
PB7
PB7SCAN C
SCAN A
SW-MAC
XKEY
KEYINT
XKEY
KEYINT
XROM
XROM
XRES
XRES
XCS7
FLASH CT1
MODE0
SW-PC1
SW-PC2
1M CLOCK
XMUTE
LRCK
LRCK
BCK
BCK 256/384FS
256/384FS
XPD XPD
XRES
XMUTE
D9
D3
D4
D1
WA11
WD8
WD5
WD4
WD1
WA6D13
D8
WD15
WA13
WA12
WD14
WD7
WD12
D13
D13
D4
D1
WD4
D15
XWCS1
XXPINT
XLWR
WD6
WA22
WA19
D5 WA12
D12
D4
D14
D14
WD3
WA7
D10
D6
EA[0..8]
XRD
WA14
WD11
D7
D5
WD9
WA21
D6
WD8
WD14
WD5
WA7
WA4
WA1
WD7
WD0
WA11
D6
D0
WA8
D14
D8
D15
WD12
WD3
WD3
D7
D7
EA2
WA16
D9
WD11
WD13
WD2
D12
XRD
D[0..15]
XXPINT
WA2
D8
WD4
WD2
WA6
D15
XWCS0
WD15
WA13
WA9
WA19
WA22
WA[0..21]
D13
WA17
D2
D8
WD2
D11
WD10 WD9
WA6
WD1
WD12
EA1
EA0
EA8
WA12
WA10
WA21
D7
XRD
WA7
WA18
D3
EA8
WA3
D14
D0
XRD
WD11
WA1
WA14
WA20 WD13
WA8
EA0
WD14
WD6
WD2
EA1
WA20
WD0
EA2
WA15
WA11
WD6
WA22
D15
WA4
WA5
WA5
WD15
WA13
D10
EA3
WD13
WD5
WD3
WA20
XRD
WD10
WD8
WA2
D0
WD15
WA14
WA1
WD10
D1
WD4
WA21
WA9
WA15
XRD
EA3
WA16
WD[0..15]
WA8
WA16
WA10
WD10
WD9
WD1
D12
D9
EA4
WA15
D8
WD9
WD7
EA7
WA3
WA4
WD0
WD12
WA2
D9
WD8
D10
D3
D12
WD6
EA4
WA17
WA18
D4
D3
D9
WD13
EA5
WA17
D2
D10
WD11
WA9
WA3
XXP
D11
D5
D2
D2
WD7
D11
D11
EA6
WD0
D13
D6
WD14
WD1
D0
WD5
EA5
WA19
D5
D10
WA18
WA10
D11
D12
D15
D14
EA7
EA6
WA5
D1
A13
A13
A9
A9
A4
A4
A[0..18]
A8
A5
A2
A12
A12
A7
A15
A1
A10
A3
A0
A11
A6
A6
A18
A5A11
A6
A10
A10
A16
A12
A13
A11
A3
A8
A5
A7
A5
A12
A1
A15
A15
A3
A14
A2
A2
A13
A0
A10
A3
A14
A2
A2
A17
A13
A7
A7
A1
A17
A4
A16
A11
A6
A6
A7
A14
A9
A4
A10
A12
A15
A1
A3
A8
A9
A11
A1
A14
A18
A0
A1
A8
A8
A9
A4
ED1
ED2
ED6
ED4
ED5
ED7
ED3
ED5
ED1
ED0
ED3
ED6
ED4
ED2
ED7
ED0
ED[0..7]
RIGHT SIGNAL
RES
XPD-OUT
FLASH CT0
TEMPO
MODE0 MODE1
MODE1 XHWR
SD
SD
XXP
PHAI
PHAI
XRESRES
LEFT SIGNAL
SCAN B
DATA1
BEAT
PB4
PB4
A5
RES
FS-SELECT
DIF1
DIF0
1M CLOCK
CTS
AD-TEMPO
LED EN
PA0
PA1
PA2
XLWR
XLWR
E_RAS
E_CAS
E_WR
E_RAS
E_CAS
E_WR
OpAmp_+P
OpAmp_+POpAmp_-N
RXD1
TXD1
MIDI OUT
MIDI IN
AD-VREF
DATA3
MK10
MK9
MK8
MK7
MK8
MK9
MK10
DAMPER
SOFT
SOFT-OUT
AVCC
VREF
D+5
VREF
DAMPER-OUT
SOST-OUT
MK7MK7
DATA2
A-
MK0T0
BR0T1
MK1T2
BR1T3
MK2T4
BR2T5
MK3T6
BR3T7
MK4T0
BR4T1
MK5T2
BR5T3
MK6T4
BR6T5
MK7T6
BR7T7
MK8MK9
BR8BR9
A+
OpAmp_-N
AG
AVSS
FLASH CT0
AVSS
DG
AVSS
+
D3.3
D
D
D
D
+5D
D
+5D
D
D
D
+5D
D
D
D
+5D
+5D +5D
D
D
D
+5D
+5D
D
D
+5D
D
DD
D
D
D
+5D
D
+5D
+5D
D
A
A
+5A
+5D
A
+
D D
D
D
+5D
D
+5D
D
+5D +
D3.3
D
D
DD
D
+5D
+
-
A
+5D
D
+5D
D
+5A
D
D
+5D
D
+5D
D
+5D
D
D
D
DD
D
D
D
D
D
D
D
+5D
+5D +5D +5D
+5D
+5D
+5D
+5D
+5D
+5D
+5D
+
+
D
D+5D
+5D
+5D
+5D
+5D
+
+5A +
A
D
D
D
D
D
D
D
D
D
D
D
D
D D
C320.1
C390.1
C350.1
C400.1
C240.1
C250.1
C260.1
C300.1
C310.1
C330.1
C340.1
C380.1
RA19
NIU
12
3
4
5
6
7
8
9
RA18
6.8k
12
3
4
5
6
7
8
9
IC16
SSC1080
7 33
20 46
24
23
22
21
19
18
17
16
15
14
13
12
11
10
9
8
6
5
4
3
2
1
31
30
29
28
27
26
25
32
49
48
47
44
43
42
41
40
39
38
37
34
36
35
45
50
51
52
VDD VDD
VSS VSS
SC10
PR10
SC9
PR9
SC8
PR8
SC7
PR7
SC6
PR6
SC5
PR5
SC4
PR4
SC3
PR3
SC2
PR2
SC1
PR1
SC0
PR0
T7
T6
T5
T4
T3
T2
T1
T0
CLK
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
INT
RD
WR
CS
RESET
TEST1
TEST2
IC11
NIU
44
43
2
3
34
35
36
37
38
39
40
41
42
4
5
6
7
8
9
10
11
31
33
12
14
29
27
25
22
20
18
16
30
28
26
24
21
19
17
15
1
23
13
32
A20
A19
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
*/D15
BYTE
CE
OE
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A21
VCC
VSS
VSS
IC12
LHMN5KRW
44
43
2
3
34
35
36
37
38
39
40
41
42
4
5
6
7
8
9
10
11
31
33
12
14
29
27
25
22
20
18
16
30
28
26
24
21
19
17
15
1
23
13
32
A20
A19
A18
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
*/D15
BYTE
CE
OE
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A21
VCC
VSS
VSS
RA310k
1 8
2 7
3 6
4 5
RA510k
1 8
2 7
3 6
4 5
RA610k
1 8
2 7
3 6
4 5
RA810k
1 8
2 7
3 6
4 5
IC5
HM62256LFP-7T
1
26
2
23
21
24
25
3
4
5
6
7
8
9
10
20
27
22
19
18
17
16
15
13
12
11
28
14
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
CE
R/W
OE
I/O8
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
I/O1
VDD
GND
IC7
HM62256LFP-7T
1
26
2
23
21
24
25
3
4
5
6
7
8
9
10
20
27
22
19
18
17
16
15
13
12
11
28
14
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
CE
R/W
OE
I/O8
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
I/O1
VDD
GND
IC13A
TC7WU04F
1 7
IC13B
TC7WU04F
3 5
C77
0.1
R25
1M
X2
24.576MHz
14
R44
0
CN7
IL-FPC-14ST-N
NIU
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1
2
3
4
5
6
7
8
9
10
11
12
13
14
IC2B
TC7W00F
NIU 5
6
3
R11
10k
R7
1.5k
X1
16.000MHz
14
C70
0.1
C69
0.1
C68
NIU
R21 0
RA7 220
1 8
2 7
3 6
4 5
RA9 220
1 8
2 7
3 6
4 5
R45
47k
IC19
TC7S08F
1
2
4
53
R49
0
C105
0.1
R23
0
R29
100
R31
100
R34
100
C64
NIU R24
0
+
-
IC17C
UPC4570G
84
C81
10/16
C82
33/16
IC15
AN78L05M
NIU
3 1
2
INOUT
COM
IC20A
TC7W14F
17
C130
0.01
R64
100
C29
0.1
IC2C
TC7W00F
NIU
84
IC10
PA28F400B5B60
3
34
35
36
37
38
39
40
41
42
4
5
6
7
8
9
10
11
31
12
43
14
2
33
44
29
27
25
22
20
18
16
30
28
26
24
21
19
17
15
1
23
13
32
A17
A16
A15
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
*/DQ15
CE
WE
OE
WP
BYTE
RP
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
VPP
VCC
VSS
VSS
R32
100
R30
10
R27
NIU
IC8
PQ3DZ53
1
2
3
4
5
IN
OFF
OUT
NC
GND
C16
10/16
C15
0.1
IC9
TC203C180AF(XP6)
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44 45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88 89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132 133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
VDD5
SDIB
BCKB
WCKB
SDOC
VSS
SDOD
BCKC
WCKC
OUTP1
VDD5 VDD3
OUTP2
OUTP0
VSS
SYO
VSS
SYI
RW
DS
CA10
CA9
CA11
CA8
CA12
CA7
CA13
CA6
CA5
CA4
CA3
CA2
VDD5
CA1
CA0
CD15
CD0
CD7
VSS
CD8
CD14
CD1
CD6
VDD5 VDD5
CD9
CD13
CD2
CD5
CD10
VSS
CD12
CD3
CD4
CD11
VDD3
WAIT
CS
RESET
AS
VSS
INT
VSS
CK
TEST
VDD5
WA23
WA22
WA20
WA21
WA19
VSS
WA18
WA9
WA8
WA10
VDD5
WA7
WA11
WA6
WA12
WA5
VSS
WA13
WA4
WA14
WA3
VDD5 VDD5
WA15
WA2
WA16
WA0
WA1
WA17
VSS
WOE1
WOE0
WD15
VDD3
WD0
WD7
WD8
WD14
VSS
WD1
WD6
WD9
WD13
WD2
WD5
WD10
WD12
WD3
WD4
WD11
VSS
WCS0
WCS1
WCS2
VDD5
WCS3
WCS4
WCS5
WCS6
WCS7
VSS
WREQ
WACK
ED7
VSS
VDD5 VDD5
VSS
ED6
ED5
ED4
ED3
ED2
VSS
ED1
ED0
EWE
VDD3
RAS
CAS
EA8
EA0
VSS
EA7
EA1
EA6
EA2
EA5
EA3
EA4
VSS
SDOA5
SDOA4
SDOA3
SDOA2
SDOA1
SDOA0
VSS
VDD5
SDIA5
SDIA4
SDIA3
SDIA2
SDIA1
VSS
SDIA0
BCKA
WCKA
SDOB
VDD5
R26
0
C370.1
R20 0
C65
0.01
R39
68k
IC20B
TC7W14F
35
IC20D
TC7W14F
84
C140
0.1
IC13C
TC7WU04F
6 2
R52
0
R18
NIU
R22
NIU
R13
NIU
C45
10/16
RA10
220
1 8
2 7
3 6
4 5
RA12
NIU
1 8
2 7
3 6
4 5
C43
0.1 R17
10k
C71
0.1
R3
0
R14
NIU
C23
0.1
R63 100
IC14
MB814260-60PJ
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
VCC
DQ0
DQ1
DQ2
DQ3
VCC
DQ4
DQ5
DQ6
DQ7
NC
NC
WE
RAS
NC
A0
A1
A2
A3
VCC
VSS
A4
A5
A6
A7
A8
OE
UCAS
LCAS
NC
DQ8
DQ9
DQ10
DQ11
VSS
DQ12
DQ13
DQ14
DQ15
VSS
C78
10/16
IC2A
TC7W00F
NIU
1
2
7
R65
68
R69
NIU
C66
12p
C67
15p
C111
100p
C56
33p
C57
33p
C58
33p
C59
33p
C131
100p
C155
22p
C163
22p
C156
22p
C164
22p
C165
22p
C157
22p
C166
22p
C158
22p
C167
NIU
C159
NIU
C168
NIU
C160
NIU
C169
NIU
C161
NIU
C170
NIU
C162
NIU
C148
22p
C141
22p
C142
22p
C143
22p
C144
22p
C145
22p
C146
22p
C147
22p
C154
22p
C153
22p
C152
22p
C151
22p
C150
22p
C149
22p
C44
12p
C46
15p
RA2
220
1 8
2 7
3 6
4 5
R2
NIU
RA17
6.8k
12
3
4
5
6
7
8
9
RA16
6.8k
12
3
4
5
6
7
8
9
R190
R71 0
R70 0
R75
10k
R72
10k
IC6
HD6413006
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
VCC
CS7/TMO0/PB0/*
CS6/DREQ0/PB1/*
CS5/TMO2/PB2/*
CS4/DREQ1/PB3/*
UCAS/TP12/PB4
SCK2/LCAS/PB5/*
TXD2/TP14/PB6
RXD2/TP15/PB7
RESO
VSS
TXD0/P90
TXD1/P91
RXD0/P92
RXD1/P93
IRQ4/SCK0/P94
IRQ5/SCK1/P95
D0/P40
D1/P41
D2/P42
D3/P43
VSS
D4/P44
D5/P45
D6/P46
D7/P47
D8
D9
D10
D11
D12
D13
D14
D15
VCC
A0
A1
A2
A3
A4
A5
A6
A7
VSS
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
VSS
P60/WAIT
P61/BREQ
P62/BACK
P67/FAI
STBY
RES
NMI
VSS
EXTAL
XTAL
VCC
AS
RD
HWR
LWR
MD0
MD1
MD2
AVCC
VREF
P70/AN0
P71/AN1
P72/AN2
P73/AN3
P74/AN4
P75/AN5
P76/AN6/DA0
P77/AN7/DA1
AVSS
P80/IRQ0/RFSH
P81/IRQ1/CS3
P82/IRQ2/CS2
P83/IRQ3/CS1/AD
P84/CS0
VSS
PA0/TEND0/TCLK*
PA1/TEND1/TCLK*
PA2/TCLKC/TIOC*
PA3/TCLKD/TIOC*
PA4/A23/TIOCA1*
PA5/A22/TIOCB1*
PA6/A21/TIOCA2*
PA7/A20/TIOCB2*
C14
0.1
R74
10k
C13
10/16
R73
10k
R59
0
Q1
RN2421 1
32
R55
NIU
R28
NIU
R53
NIU
R54
NIU
C6 0.1
C7 0.1
C8 0.1
C79
0.1 C80
0.1
C76
0.1
C74
33/16
R42
68k
C113
0.1
R47
0
C75
0.1
C118
0.1
C129
0.1
C116
0.1
C55
0.1
C72
0.1
C73
0.1
IC20C
TC7W14F
62
R37
6.8k
R40
10k
C100
560p
C92
10/16
+
-
IC17A
UPC4570G
2
3
1
R35
6.8k
R3310k
C83560p
R36
6.8k
R38
6.8k
R67NIU
C91
100p
R56 6.8k
R62
10k
C119
560p
C115
CV@B
10/16
+
-
IC17B
UPC4570G
6
5
7
R50 6.8k
R48 10k
C112560p
R51 6.8k
R57 6.8k
R68
NIU
C114
100p
R46
68k
R41
68k
C10710/16
C104
10/16
R81
NIU
R79
270
R76
100k
R83
100
R84 100
R85
100
CN9
IL-FPC-16ST-N
NIU
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R86
0
R77
100k
R78
100k
C101
10/16
RA1310k
1 2
3 4 5 6 7 8 9
RA11220
1 8
2 7
3 6
4 5
IC18
AK4324
1 2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DVSSDVDD
CKS
MCLK
PD
BICK
SDATA
LRCK
SMUTE
DFS
DEM0
DEM1
DIF0
DIF1
DIF2
AOUTR-
AOUTR+
AOUTL-
AOUTL+
AVSS
VREF
AVDD
DZFR
DZFL
C11010/16
C10
0.1
R1
0
C28
0.1
C60
33p
C42
0.1
C36
0.1
D1
RB420D
NIU
1
3
C63
33p
C48
10/16
C22
0.1
C21
0.1
C50
0.1
C117
100/6.3
C41
0.1
C9
0.1
C54
10/16
C61
33p
C49
0.1
C47
0.1
IC13D
TC7WU04F
84
C27
0.1
C62
33p
R61
0
C52
0.01
C2
NIU
C51
100p
R6
NIU
R5
NIU
R88
10k
R89
10k
R90
10k
R92
10k
R91
10k
CN5
AMPC1.2716P
3
4
5
6
7
8
2
1
9
16
15
14
13
12
11
10
CN6
AMPC1.2720P
3
4
5
6
7
8
2
1
9
20
19
18
17
16
15
14
13
12
1110
CN4
53014-0410
3
4
2
1
CN3
53014-1010
3
4
5
6
7
8
2
1
9
10
CN2
53014-0710
3
4
2
1
5
6
7
CN1
53014-0910
NIU
3
4
5
6
7
8
2
1
9
IC21
PQ05DZ1U
1
2
3
4
5
IN
OFF
OUT
NC
GND
C103
33/16
C102
0.1
R87
NIU
C109
33/16
R66
NIU
C108
NIU
C53
NIU
R15
10k
C3
NIU
R9
10k R10
10k
C106
0.01
R60
0
R8
10k
R58
NIU
C20
0.1
CN8
53014-1110
3
4
5
6
7
8
2
1
9
10
11
R82
0
R
10k

A
B
C
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12345678910 12131415161718192021222324252627282930
12
11
EP-77 Dec, 1999
CONTROL PCB ASSY & CIRCUIT DIAGRAM ASSY 7711502000
View from component side
SW 111
EVQPAE05R
12
SW108
EVQPAE05R
12
SW109
EVQPAE05R
12
SW102
EVQPAE05R
12
SW113
EVQPAE05R
12
SW115
EVQPAE05R
12
SW101
EVQPAE05R
12
SW112
EVQPAE05R
12
SW106
EVQPAE05R
12
SW104
EVQPAE05R
12
SW103
EVQPAE05R
12
SW105
EVQPAE05R
12
Q108
DTC114ES
3
12
SW110
EVQPAE05R
12
SW107
EVQPAE05R
12
LED101
TLHR-4401
12
IC101
TC74HC138P
C
3
B
2
A
1
G2B
5
G2A
4
G1
6
Y7 7
Y6 9
Y5 10
Y4 11
Y3 12
Y2 13
Y1 14
Y0 15
VCC
16 GND 8
Q106
DTC114ES
3
12
Q107
DTC114ES
3
12
C101
100nF
C103
100nF
R101
1K8
R102
1K
R103
1K R106
100
R107
100
R108
100
C102
100/16
Q101
RN2227
3
21
Q102
RN2227
3
21
Q103
RN2227
3
21
Q104
RN2227
3
21
Q105
RN2227
3
21
D101
1N4148
12
D102
1N4148
12
D103
1N4148
12
D104
1N4148
12
D105
1N4148
12
D106
1N4148
12
D110
1N4148
12
D108
1N4148
12
D109
1N4148
12
D107
1N4148
12
D111
1N4148
12
D112
1N4148
12
D113
1N4148
12
D114
1N4148
12
R105
1K
R104
1K
D115
1N4148
12
LED106
12
LED107
SPR-325MVW
12
3
LED105
12
LED104
12
LED103
12
LED102
12
C106
68pF
VR1B
4
6
5
C107
68pF
C105
100nF
VR1A
RK14K1230
1
3
2
CN102
53014-0610
3 4 2 1 5 6
CN101
53014-1010
3
4
5
6
7
8
2
1
9
10
SW114
EVQPAE05R
12
IC102B
74HC08
4
5
6
IC102D
74HC08
12
13
11
IC102C
74HC08
9
10
8
C104
100nF
IC102A
74HC08
1
2
3
14 7
5VD
5VD
5VD
5VD
5VD
5VD
5VD
5VD
SCAN C
SCAN B
SCAN A
LED EN
DATA 0
DATA 1
DATA 2
DATA 3
To Main Board (CN3)
To Jack Board (CN6)
MAXMIN
TOP WIEV
VOLUME BOARD
(10KBx2)
SEND L
SEND R
RET L
RET R
AGND
AGND
POWER
REVERB
CHORUS
PIANO 1
PIANO 2
ORGAN
HARPSI
VIBRAPHONE
E.PIANO
STRINGS
CHOIR
DEMO
PLAY
SOUND
REC
ON/OFF
REVERB
CHORUS
DEMO REC
PLAY ON/OFF
4 512 36n
TLHR-4401
TLHR-4401
TLHR-4401 TLHR-4401
TLHG-4401

View from component side
View from component side
RIGHT CONTACT PCB ASSY w/RUBBER ASSY 7695004000
LEFT CONTACT PCB ASSY w/RUBBER ASSY 7695005000
A
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12345678910 1213141516171819202122232425262728293011
13
EP-77
Dec, 1999
CIRCUIT DIAGRAM (LEFT CONT.PCB ASSY)
CIRCUIT DIAGRAM (RIGHT CONT.PCB ASSY)

If device error does not occur, version will be displayed after Device Check.
If device error occurs, press the [Demo] button. Then, version will be displayed.
[Version Display]
| 1.00 1.01 1.02 1.03 1.04 1.05
-------+--------------------------------------------
Demo | @ @ @ @ @ @
Metro | - - - * * *
Play | - * * - - *
Rec | * - * - * -
And now, you can find out ep-77 by checking Cho/Rev LED.
ep-77
Chorus LED @
Reverb LED -
Press the [Demo] button, then you can go Button/LED Check.
2. Button/LED Check
At first, all LED turn on.
By pressing each buttons, each LED turn off and piano sound is on.
After all LED is off, you can go to Effect Check.
[Each button's sound]
[REV]=C4
[CHO]=C#4
[Tone1]=D4
[Tone2]=D#4
[Tone3]=E4
[Tone4]=F4
[Tone5]=F#4
[Tone6]=G4
[Tone7]=G#4
[Tone8]=A4
[Sound]=A#4
[Metro RED]=B4
[Metro GRN]=C5
[PLAY]=C#5
[Rec]=D5
[DEMO]=D#5
You can jump to Effect Check by pressing the [Rev]+[Demo] buttons.
3. Effect Check
* Demo --> Go to Panning Check.
@ Metro --> Make a piano sound with Chorus effect.
@ Play --> Make a piano sound with Reverb effect.
@ Rec --> Make a piano sound with Resonance effect.
4. Panning Check
@ Demo --> Go to Tempo & Beat Check.
@ Metro --> Make a C3 sine-wave sound from left.
@ Play --> Make a C4 square-wave sound from right.
@ Rec --> Make a C4 sine-wave sound from center.
Flow Chart
+-------+
| Enter | * [Demo]+[Sound] + Power On
+-------+
|
+----------->|
| v
| +--------------+ N.G. +---------------+
| | Device Check | --> | Error Display |
| +--------------+ +---------------+
| | |
| v |
| +-----------------+ |[Demo]
| | Version Display | <---------+
| +-----------------+
| |[Demo]
| v
| +------------------+
| | Button/LED Check |
| +------------------+
| |(Auto/Jump=[Rev]+[Demo])
| v
| +--------------+
| | Effect Check |
| +--------------+
| |[Demo]
| v
| +-----------+
| | Pan Check |
| +-----------+
| |[Demo]
| v
| +------------------+
| | Pedal/MIDI Check |
| +------------------+
| |(Auto/Jump=[Rev]+[Demo])
| v
| +-----+
| | End |
| +-----+
| |[Demo]
+------------+
Notation:
* LED On
@ LED Blink
- LED Off
0. Enter Test Mode
While pressing the [Demo] & [Sound] buttons, turn the power on.
1. Device Check, Version Display
At first, Device Check is done.
While checking device, all LED is On.
Device error may be displayed on LED as next figure.
[Device Error Display]
|Mask RAM Wave DSP
|ROM ROM RAM
-------+---------------------------
Demo |@ @ @ @
Metro |@ - @ -
Play |- - - @
Rec |- @ @ -
TEST MODE
14
EP-77 Dec, 1999

EP-77
Dec, 1999
15
5. Tempo & Beat Check (A/D)
Tempo Knob |Rev Cho
------------------+----------------
Left |* -
| |@ -
Center |* *
| |- @
Right |- *
Beat knob |Metro Play Rec
------------------+------------------------
0 |* - -
2 |* * -
3 |* * *
4 |- * *
6 |- - *
Press the [Demo] button, then you can go to Pedal/MIDI Check.
6. Pedal/MIDI Check
Connect the MIDI Out to the MIDI In.
[ep-77]
- Demo
@ Metro --> Display Soft Pedal status. (6-1)
@ Play --> Display Damper Pedal status. (6-1)
* Rec --> Display MIDI status. (6-2)
After detecting each pedal's A/D max(7FH)/min(00H) value and MIDI
connection on/off, you can automatically exit TestMode.
(6-1) Notation of Pedal status:
#Unchecked. @
#A/D value is max(pedal is depressed): *
#A/D value is min(pedal is released): -
#If two pedal's A/D value move simultaneously, the pedal status
returns to be Unchecked.
#If A/D value is max(7FH), bell sound is on.
(6-2) Notation of MIDI status:
#Unchecked. @
#While connecting MIDI Out to MIDI In. *
#While cutting off MIDI connection. -
Press the [Rev]+[Demo] buttons. Then, you can exit TestMode.
7. End
All LED is blinking.
If you press the [Demo] button, you can start TestMode once again.