Onkyo SE-U55 User manual

SE-U55
SERVICE MANUAL
Ref.No.3692
May 2001
USB Digital Audio Processor
SE-U5
5
UP
FUNCTION SELECTOR
INTERNAL
LINE
MIC
MONITOR
DIGITAL
INPUTLEVEL
PHONELEVEL
MAX
MAX
MIC
PHONES
USBDIGITAL AUDIO
PROCESSOR
SE-U55

SE-U55
Type USB digital audio processor
Connection method USB (Universal Serial Bus Ver. 1.1)
Sampling rate
Digital input 32/44.1/48 kHz compatible
Digital output 44.1 kHz
Frequency characteristics 0.3 Hz to 20 kHz (+0/-0.5 dB, LINE OUT)
Signal-to-noise ratio 100 dB (A-filter)
Total harmonic distortion 0.002% (1 kHz, 0 dB)
Output level 1.0 Vrms
Line input level 250 mVrms
Microphone input se4nsitivity 5.0 mVrms
Power supply USB power supply, separately sold DC 7.5 V (exclusive adapter)
Current dissipation 400 mA
External dimensions 50 x 216 x 166 mm / 1 15/16" x 8 1/2" x 6 9/16"
Weight 0.7 kg / 1.5 lbs.
Specifications and external appearance are subject to change without notice.
Main specifications
Thankyou for purchasing the Onkyo USB Digital
AudioProcessor.
Besure to read this instruction manual thoroughly
beforeoperating the unit and always adhere to the
instructionsgiven within during operation. Also,
keepthis instruction in a safe place for future
reference.
Instruction Manual
USBDigital Audio Processor
SE-U55
UP
FUNCTIONSELECTOR
INTERNAL
LINE
MIC
MONITOR
DIGITAL
INPUTLEVEL
PHONELEVEL
MIN
MIC
- +
PHONES
USBDIGITALAUDIO
PROCESSOR
SE-U55
Accessories
The SE-U55 comes supplied with the accessories shown below. Make sure that these
accessories are present at the time of purchase. The number in parenthesis is the quantity
of that accessory.
❒This instruction manual (1)
Explains operational procedures and the required settings for
connecting the SE-U55 to your computer.
❒CD-ROM (1)
Contains the software for using the SE-U55 with a computer
and an on-line instruction manual.
❒SE-U55 (1)
The USB digital audio processor. The SE-U55 converts your
computer’s sounds to professional-level high-quality audio
sound.
❒Audio pin-cord (1)
For the analog connection of the SE-U55 to external analog
audio devices.
❒USB cable (1)
For the connection of the SE-U55 to your computer.
❒CarryOn Music instruction manual (1)
Instruction manual for using the supplied software CarryOn
Music.
Note:
The power supply for the SE-U55 is supplied through the USB cable from the connected computer.
❒Registration Card (1)
❒Quick Setup guide (1)

SE-U55
CHASSIS-EXPLODEDVIEW
9
10 12
8
7
13
7
11
14
6
1
4
2
15
5
7
7
7
U1
19
17
19
19
16
18
3
Q751
21
20

SE-U55
CHASSIS-EXPLODEDVIEW PARTS LIST
REF NUMBER DESCRIPTION PART NUMBER
U1 PC BOARD AS, NAAR-7035-1C 1W223535-1C
1 CHASSIS 27100392
2 3TTB+8B(BC), SCREW 838430088
3 3P+10FN(BC), SCREW 82143010
4 SPACER M506RS 27270262
5 CASE, (L) 29105203
6 CASE, (R) 29105204
7 3TTB+8B(UN), SCREW 838930088
8 FRONT PANEL 27212266A
9 FACET, (SEL) 28198920
10 GUIDE, (VR) 27268034
11 END CAP, (L) 28125392
12 END CAP, (R) 28125394
13 KNOB, (SEL) 28325885
14 KNOB, (MIC) 28325884
15 LABEL, SPEC 29362847
16 STANDING AS 28163066
17 CUSHION, (DAC) 28141443
18 3SMS8W.SW+14B(BC), SCREW 801433
19 3TTB+8B, SCREW 838130088
20 SHLD PLT (U) 27150468
21 SHLD PLT (D) AS 27150467

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : INTERNAL)
DAC
C9/C15
P401
Q200
2SA1162-Y
Q201
2SC2712-Y
11 10
98
13 12
56
34
Q357
74HC04
12
7
14
Q902
SI-3033LUS
G
IO
Q903
SI-3033LUS
G
IO
Q901
SI-3050F
G
1
INOVC VOS
E903
C200
102J
Q402
CS8404A
C/SBF 10
C6/C2 4
C7/C3 1
CBL/SBC15
EM0/C914
EM1/C813
FSYNC 7GND18
M021
M122
M223
MCK 5
SCK 6
SDATA 8
TRNPT/FC1
24
TXN
17
TXP20
U11
V9
VD+
19
C1/FC0 3
12
PRO 2
RST16
Q753
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE7
XCOM 14
YCOM 15
ZCOM
4
AIL4
AIR5CL47
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C6
FOC 56
FOD 55 FOW 54
LOCK 48
VDDA13
VDDD6 52
VSSA12
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
MODEL NO SE-U55/UE-155
P901
L752
BLM21A102F
L751
BLM21A102F
L502
BLM21B221SB
L501
BLM21B221SB
L503
BLM21B221SB
L901
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
L401
47UH
NCH-1479
F901
ICP-S2.3
D903
SFPJ63
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D200
1SS352
D201
1SS352
D403
D901
SFPJ63
D902 SFPJ63
D401
1SS352
D402
Q905
RN1402
R511
0
R512
0
R513
0
R514
0
R515
0
R516
0
R517
0
R518
0
R519
0
R502
0
R504
0
R503
0
R407 75
R501
1K
R408
75
R714
0
R907 0
R914
0.22
(1W)
R207
1K
R206
1K
R205
1K
R204
1K
R202
2.2K R203
2.2K
R201
4.7K
R200
10K
R905
10K
R902
1K
R901
10K
R913
330
R911
330
R753 0
R904
10K
R903
22K
R751
1M
R912
0
R404 2.2K
R403 2.2K R402 2.2K
Q904
M51957B
CAP 5GND4
IN
2
NC1
1
NC2
3
NC3 8
OUT 6
VCC 7
C546 101JC763
C764 180J
C543 105M
C512
473Z
C511
223Z
C510
102J
C509
331J
C752
104Z
C751
104Z
C540
101J
C539
101J
C538 101J
C534 101J
C535 101J C536 101J C537 101J
C530 101J
C502
102J
C503
101J
C505
101J
C506
102J
C507
101J
C508
102J
C501
101J
C504
102J
C413 472K
C417
104Z
C913 104Z
C414 104Z
C202
102J
C201
102J
C768 472K
C767 103K
C766 333K
C753
050C
C904
104Z
C756 104Z
C754
050C
C755
103K
C415
104Z
C765
104Z
C905 1/50
C410
0.1/50
C910
0.47/50
C901 10/16
C206
100/16
C205
10/50
C204
10/50
C203
10/50
C401
47/16
C903
470/6.3
D904 SLR-332MC
U401
TORX178A
U402
TOTX178
Q751
UDA1325
BCK 61
CLK27
D+8
D-6
DA 57
GP0/BCKI17
GP1/DI13
GP2/DO 63
GP3/WSO
1
GP4/BCKO
2
GP5/WSI15
P0.0 56
P0.1 58 P0.2 60 P0.3 62
P0.4
64
P0.53
P0.6
5
P0.7
7
P2.0
14
P2.1
16
P2.2
18
P2.3
20
P2.4
22
P2.5
23
P2.6
29
P2.730
SCL
19
SDA21
SHTCB4
VDDE12
VDDI9
VDDX
28
V
V
R
V
R
VSSA3 55
VSSE11
VSSI10
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B26
PSEN31
X751
48M
D406 D405
UDZ3.3B
D404
C412
22/16
L402
NSRF-2046
Q754
TC7WU04
17
4
8
Q754
TC7WU04
62
Q754
TC7WU04
35
R411 680
R410 680
R409 680
R414 1.5K
R413 1.5K
R412 1.5K
0
1
7
+3.3D
+3.3A
+5A
RESET
DI
DO
BCKI
WSI
+5D
BCKO
128FS
DIT_C3 DIT_C2
DIT_C15
UP_LED
SRC_DA SRC_LD
SRC_RST
CLK
RESET
WAV/DIR
BCKO
WSO
DO
R714 100
UDDUJJ
BK1608LL241-T
C534-540
R511-519 ohm
544-546 101J
NO USE
101JC530
UJJ UDD
UJJ UDD
(UDD= )
C905
C543
UJJ UDD
ohm
C502,504,506,508
R502-504
C512
C511
C510
C509
L501-503
C501,503,505,507
0
UJJ UDD
NC
OUTPUT
OPTICAL
INPUT
OPTICAL
1.5A
7.5V
DC IN
COAXIAL
INPUT
OUTPUT
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : INTERNAL)
L807
4BLH-CUM05R5CN1
Q401
TDA1373H
AIL4
AIR
5
AOL19
AOR1
15
BS 34
CEN 35
CL 47
CLD18
CLI23
CLO1
27
CLO2
28
CLO330 CLO4
31
CUS 36
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C
6
DO2D
10
DO2W
16
EM 37
FOC 56
FOD 55 FOW 54
FSL25
LD 45
LOCK 48
MU 44
SA 43
TST1 42
TST2 41
VDDA13
VDDA4
19
VDDD17
VDDD211
VDDD314
VDDD4
32
VDDD5 39
VDDD6 52
VSSA12
VSSA4
20
VSSD18
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
VSSD212
VSSD313
VSSD417
VSSD524 VSSD626
VSSD729
VSSD8
33
VSSD9 40
XTLI21 XTLO
22
RST 38
L801
BLM21P221SG
L802
L754
NCH-1470
F801
ICP-S1.0
D710 1SS352
R837 0
R819 1.5K
R838 0
R802 15
R801 15
R908
0.33 (1W)
R846 0
R847 0
R415
560
R405
1M
R753 0
R751
1M
R404 2.
2
R403 2.
2
R402 2.
2
C911
104Z
C534 101J
C535 101J C536 101J C537 101J
C912 104Z
C768 472K
C419
103K
C418 223K
C409
104Z
C405
080D
C406
080D
C403
104Z
C767 1
0
C7
6
C753
050C
C754
050C
C755
103K
C402
104Z
C404
104Z
C420
220/6.3
C401
47/16
X401
33.8688MHZ
X751
48M
P801
+V 1
D+ 3
D- 2
GND 4D802
UDZ5.6B
D801
UDZ5.6B
4Q754
TC7WU04
62
Q754
TC7WU04
35
R401
4.7
+3.3D
+5D
D1+
I2C_SCL I2C_SDA
D1-
CDCD+
+5D
+3.3D
4BLH-CUN05R5BN1
UJJ UDD
0ohmR846,847
L807
NCAR-7035
USB UP
BY MARK ARE CRITICAL FOR SAFETY IDENTIFIED
NOTE
THE COMPONENTS
REPLACE ONLY WITH PART NUMBER SPECIFIED.
.
.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
.
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
.
ELECTROLYTIC CAPACITORS ( )ARE IN F/WV.
.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030 3pF 330 33pF 331 330pF
u
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
.
.
333 0.033uF
INPUT SELECTOR : INTERNAL

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : INTERNAL)
DAC
4BLH-CUM05R5CN1
L504
4BLH-CUN05R5BN1
P303 P302
P301
E902
E901
C307
221K
C305
331K
C374 101J
C324 101J
C366 152J
C316
152J
C368
152J
C318
152J
Q752
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
SCHEMATIC DIAGRAM
U
E-155
L516
BLM21P221SG
L506
BLM21P221SG
BLM21P221SG
L355
BLM21P221SG
L356
BLM21P221SG
L351
BLM21P221SG
L352
BLM21P221SG
L353
BLM21P221SG
L302
BLM21P221SG
L301
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
1
3
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D751
1SS352
R523 0
R522 0
R521 0
R311
0
R356
0
R355
0
R520
0
R510
0
R372
470
0
R505
0
R303
0
R324 330KR374 330K
R317
0
R312
0
R322
470
R373
470
R323
470
R309
0
R506
0
R301 330K R307
4.7K
R305
680
R304 100K
R302
1K
R308
33K
R392
1K
R306
1K
R327 8.2K
R377
R387
6.8K
R337
6.8K
R347 100K
R714
R397
100K
R338
10K
R351
33
R352
33
R388
10K
R314
0
R389 22K
R364
0
R339 22K
R365
33K
R315
33K
R336
22K
R385 82K
R335 82K
R386
22K
R393
33
R343
33
R310 100K
R361 100K
R362 100K
R325 4.7K
R375 4.7K
R332
100K
R382
100K
R320
10K
R370
10K
R318
2.2K
R319
2.2K
R368
2.2K
R369
2.2K
R321
4.7K
R371
4.7K
R334
33
R394
33
R316 100K
R753 0
R366 100K
(NO USE)
R752
10K
C548
101J
C547
102J
C525
102J
C526
101J
C523
102J
C556
101J
C555
102J
C527
102J
C528
101J
C524
101J
C544 101J C545 101J C546 101JC763
180J C762 104Z
C764 180J
102J
101J
C538 101J
C515
102J
C516
101J
C514
101J
C513
102J
C519
C517
C518
C551
102J
C552
101J
C554
101J
C553
102J
C756 104Z
C755
103K
C303
47/16
C302 100/6.3
C315
47/16
C365
47/16
C352
220/16
C358 220/6.3
C308 220/6.3
C363
47/16
C313
47/16
C304 47/16
C311 10/16
C757
10/16
C761
220/6.3
C351
220/16
C361
47/16
C362
47/16 C369
47/16
C319
47/16
C206
100/16
C205
10/50
C331
47/16
C332
47/16
C760 10/16
C758
10/16
C759
10/16
Q751
UDA1325
ALE 50
CLK27 DA 57
NC1 45
NC2 46
P0.0 56
P0.1 58
P0
.
260
P2.629
P2.730
RTCB 36
TC 35
VDDA1 38
VDDA2 42
VDDA3 52
VDDO
32
VDDX
28
VINL 43
VINR 47
VOUTL 34
VOUTR 37
VREF[AD] 41
VREF[DA] 40
VRN 49
VRP
51
VSSA1 39
VSSA2 44
VSSA3 55
VSSO 33
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B
26
EA 48
PSEN31
Q301
NJM4565M-D
(1/2)
3
8
2
1
Q359
NJM2140R
(1/2)
5
8
6
7
Q358
NJM2140R
(1/2)
3
8
2
1
Q352
NJM2140R
(1/2)
38
2
1
Q301
NJM4565M-D
(2/2)
5
6
4
7
Q359
NJM2140R (2/2)
3
2
4
1
Q358
NJM2140R
(2/2)
5
6
4
7
Q352
NJM2140R
(2/2)
5
6
4
7
Q389
RN1444-A
Q388
RN1444-A
Q387
RN1444-A
Q386
RN1444-A
Q353
RN1444-A
Q354
RN1444-A
R313 50K (A)
(2/2)
R313 50K (A)
(1/2)
D206
UDZ5.6B
C301
4.7/35
Q754
TC7WU04
7
Q754
TC7WU04
62
+5A
-5V
+3.3D +3.3A
+5A
-5V
CDCRST
U55UJJ 155UJJ U55UDD
R521
R522
R523
UDDUJJ
ohm309, 506505,R303,
C514,516
C513,515
L301,302
L504
Rch
Lch
520
556
555
548, 554,552,
547, 553,551,
510,356,
C523, 527,525,
355,317,312,R311,
528,526,C524,
L351-353,355,356,506,516
(ECHU)
541
Rch
Lch
507-509 ohm
542
384,383,R381,
529,522,520,C518,
521,519,C517,
L505
L381-383
UDDUJJ
ohm
UDDUJJ
Lch
Lch
Rch
Rch
R(1VrmsFS)
L(1VrmsFS)
MIC IN
LINE OUT
R(2VrmsFS)
LINE IN
L(2VrmsFS)
-5V
GND
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : INTERNAL)
L505
Q706
74HCT7007
3
4
Q706
74HCT7007 11
10
Q706
74HCT7007 9
8
Q706 74HCT7007
5
6
Q706
74HCT7007 13
12
7
Q706
74HCT7007
1
2
14
POWER MODE
OPT/COAX
NC
I2C_SDA_D
I2C_SCL_D
MCU_MUTE
UPLED
PROTECT
I2C_SCL_A
I2C_SDA_A
DIG/ANA
INH
Output only
MB89135A
MIC/LINE
MODE
AVR
Avss
EPROM_WR
WIN/MAC
CDCD+
ONK/KORG
P_ON_RST
CDCRST
DRC_DA
DIT_C3
SRC_RST
DIT_C15
WAV/DIR
DIT_C2
SRC_LD CLK X1A
AVcc
Nch Open drain
Vss
X0A Vcc X1 X0 MOD1 MOD0 RST
Q701
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
S703
X701
4MHZ
S701S702
E904
P702
Q708
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
P381
L383
L382
L381
L754
NCH-1470
D301
SFPJ63
D701
1SS352
Q384
RN1402
R381
0
R508
R509
R507
R384
R383
R380 100K R330 100K
R379
33
R329
33
R348
39K
R327 8.2K
R328 39K
R378 39K
R398
39K
R377
8.2K
R396
470
R395
470
R390
560
R391
560
R753 0
R730
10K
C309 105M
C359 105M
C541
C542
101J
C521
C529
C522
C520
C519
C517
C518
C706
104Z
C702
104Z
C705 104Z
C703
104Z
C704
104Z
C701 104Z
C755
103K
C372
47/16
C322
47/16
C360 22/6.3
C310 22/6.3
C321
10/16
C371
10/16
C306
470/6.3
Q383
NJM3414A
(1/2)
38
2
1
Q383
NJM3414A
(2/2)
5
6
4
7
Q382
RN1444-A
Q381
RN1444-A
R326
50K(A)
(1/2)
R326
50K
(A)
(2/2)
D702
UDZ3.3B
Q704
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q705
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q754
TC7WU04
62
R754 6.8K
R718 10K
R715 10K R716 10K R717 10K R708 10K
R703
10K
R704 0
R743 0R702
10K
R706
10K
R746 15K
R701 2.7K
R700 10K
R705 10K
R713 10K
R709
390
R710
470
R711
820
R729
10K
R707 0
R744 6.8K
R745
3.9K
Q385
RN2401
Q711
RN2401
C
D
CDCRST
MCU_MUTE
MIC/LINE
INH
MODE
CDCD+
P_ON_RST
OPT/COAX
WIN/MAC
WIN/MAC
+5D
I2C_SDA I2C_SCL
ONK/KORG
PROTECT
POWERMODE
EPROM_WR
EPROM_WR
I2C_SCL_D
I2C_SDA_D
I2C_SCL_A I2C_SDA_A
DIG/ANA
I2C_SCL_A
I2C_SDA_A
EPROM_WR
OPT/COAX CDCRST
UP_LED SRC_DA
I2C_SCL_D
MCU_MUTE
I2C_SDA_D
DIT_C3
MODE
DIT_C2
I2C_SCL_A
DIT_C15
I2C_SCL_D
WAV/DIR
INH I2C_SDA_A
I2C_SDA_D
MIC/LINE
DIG/ANA
RESET
SRC_LD
SRC_RST
CLK
(NO USE)
(NO USE)
NO USE
DIGITAL
507-509 ohm
542
384,383,R381,
529
,
522
,
520
,
C518
,
M24C16M24C16
ANALOG
MONITOR
INTERNAL
OPT/COAX SW
INPUT SELCTOR
MIC
LINE
PHONES
WIN/MAC SW

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : LINE/MIC)
DAC
ADC
C9/C15
P401
Q200
2SA1162-Y
Q201
2SC2712-Y
11 10
98
13 12
56
34
Q357
74HC04
12
7
14
Q902
SI-3033LUS
G
IO
Q903
SI-3033LUS
G
IO
Q901
SI-3050F
G
1
INOVC VOS
E903
C200
102J
Q402
CS8404A
C/SBF 10
C6/C2 4
C7/C3 1
CBL/SBC15
EM0/C914
EM1/C813
FSYNC 7GND18
M021
M122
M223
MCK 5
SCK 6
SDATA 8
TRNPT/FC1
24
TXN
17
TXP20
U11
V9
VD+
19
C1/FC0 3
12
PRO 2
RST16
Q753
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE7
XCOM 14
YCOM 15
ZCOM
4
AIL4
AIR5CL47
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C6
FOC 56
FOD 55 FOW 54
LOCK 48
VDDA13
VDDD6 52
VSSA12
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
MODEL NO SE-U55/UE-155
P901
L752
BLM21A102F
L751
BLM21A102F
L502
BLM21B221SB
L501
BLM21B221SB
L503
BLM21B221SB
L901
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
L401
47UH
NCH-1479
F901
ICP-S2.3
D903
SFPJ63
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D200
1SS352
D201
1SS352
D403
D901
SFPJ63
D902 SFPJ63
D401
1SS352
D402
Q905
RN1402
R511
0
R512
0
R513
0
R514
0
R515
0
R516
0
R517
0
R518
0
R519
0
R502
0
R504
0
R503
0
R407 75
R501
1K
R408
75
R714
0
R907 0
R914
0.22
(1W)
R207
1K
R206
1K
R205
1K
R204
1K
R202
2.2K R203
2.2K
R201
4.7K
R200
10K
R905
10K
R902
1K
R901
10K
R913
330
R911
330
R753 0
R904
10K
R903
22K
R751
1M
R912
0
R404 2.2K
R403 2.2K R402 2.2K
Q904
M51957B
CAP 5GND4
IN
2
NC1
1
NC2
3
NC3 8
OUT 6
VCC 7
C546 101JC763
C764 180J
C543 105M
C512
473Z
C511
223Z
C510
102J
C509
331J
C752
104Z
C751
104Z
C540
101J
C539
101J
C538 101J
C534 101J
C535 101J C536 101J C537 101J
C530 101J
C502
102J
C503
101J
C505
101J
C506
102J
C507
101J
C508
102J
C501
101J
C504
102J
C413 472K
C417
104Z
C913 104Z
C414 104Z
C202
102J
C201
102J
C768 472K
C767 103K
C766 333K
C753
050C
C904
104Z
C756 104Z
C754
050C
C755
103K
C415
104Z
C765
104Z
C905 1/50
C410
0.1/50
C910
0.47/50
C901 10/16
C206
100/16
C205
10/50
C204
10/50
C203
10/50
C401
47/16
C903
470/6.3
D904 SLR-332MC
U401
TORX178A
U402
TOTX178
Q751
UDA1325
BCK 61
CLK27
D+8
D-6
DA 57
GP0/BCKI17
GP1/DI13
GP2/DO 63
GP3/WSO
1
GP4/BCKO
2
GP5/WSI15
P0.0 56
P0.1 58 P0.2 60 P0.3 62
P0.4
64
P0.53
P0.6
5
P0.7
7
P2.0
14
P2.1
16
P2.2
18
P2.3
20
P2.4
22
P2.5
23
P2.6
29
P2.730
SCL
19
SDA21
SHTCB4
VDDE12
VDDI9
VDDX
28
V
V
R
V
R
VSSA3 55
VSSE11
VSSI10
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B26
PSEN31
X751
48M
D406 D405
UDZ3.3B
D404
C412
22/16
L402
NSRF-2046
Q754
TC7WU04
17
4
8
Q754
TC7WU04
62
Q754
TC7WU04
35
R411 680
R410 680
R409 680
R414 1.5K
R413 1.5K
R412 1.5K
0
1
7
+3.3D
+3.3A
+5A
RESET
DI
DO
BCKI
WSI
+5D
BCKO
128FS
DIT_C3 DIT_C2
DIT_C15
UP_LED
SRC_DA SRC_LD
SRC_RST
CLK
RESET
WAV/DIR
BCKO
WSO
DO
R714 100
UDDUJJ
BK1608LL241-T
C534-540
R511-519 ohm
544-546 101J
NO USE
101JC530
UJJ UDD
UJJ UDD
(UDD= )
C905
C543
UJJ UDD
ohm
C502,504,506,508
R502-504
C512
C511
C510
C509
L501-503
C501,503,505,507
0
UJJ UDD
NC
OUTPUT
OPTICAL
INPUT
OPTICAL
1.5A
7.5V
DC IN
COAXIAL
INPUT
OUTPUT
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : LINE/MIC)
L807
4BLH-CUM05R5CN1
Q401
TDA1373H
AIL4
AIR
5
AOL19
AOR1
15
BS 34
CEN 35
CL 47
CLD18
CLI23
CLO1
27
CLO2
28
CLO330 CLO4
31
CUS 36
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C
6
DO2D
10
DO2W
16
EM 37
FOC 56
FOD 55 FOW 54
FSL25
LD 45
LOCK 48
MU 44
SA 43
TST1 42
TST2 41
VDDA13
VDDA4
19
VDDD17
VDDD211
VDDD314
VDDD4
32
VDDD5 39
VDDD6 52
VSSA12
VSSA4
20
VSSD18
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
VSSD212
VSSD313
VSSD417
VSSD524 VSSD626
VSSD729
VSSD8
33
VSSD9 40
XTLI21 XTLO
22
RST 38
L801
BLM21P221SG
L802
L754
NCH-1470
F801
ICP-S1.0
D710 1SS352
R837 0
R819 1.5K
R838 0
R802 15
R801 15
R908
0.33 (1W)
R846 0
R847 0
R415
560
R405
1M
R753 0
R751
1M
R404 2.
2
R403 2.
2
R402 2.
2
C911
104Z
C534 101J
C535 101J C536 101J C537 101J
C912 104Z
C768 472K
C419
103K
C418 223K
C409
104Z
C405
080D
C406
080D
C403
104Z
C767 1
0
C7
6
C753
050C
C754
050C
C755
103K
C402
104Z
C404
104Z
C420
220/6.3
C401
47/16
X401
33.8688MHZ
X751
48M
P801
+V 1
D+ 3
D- 2
GND 4D802
UDZ5.6B
D801
UDZ5.6B
4Q754
TC7WU04
62
Q754
TC7WU04
35
R401
4.7
+3.3D
+5D
D1+
I2C_SCL I2C_SDA
D1-
CDCD+
+5D
+3.3D
4BLH-CUN05R5BN1
UJJ UDD
0ohmR846,847
L807
NCAR-7035
USB UP
INPUT SELECTOR : LINE/MIC
BY MARK ARE CRITICAL FOR SAFETY IDENTIFIED
NOTE
THE COMPONENTS
REPLACE ONLY WITH PART NUMBER SPECIFIED.
.
.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
.
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
.
ELECTROLYTIC CAPACITORS ( )ARE IN F/WV.
.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030 3pF 330 33pF 331 330pF
u
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
.
.
333 0.033uF

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : LINE/MIC)
DAC
ADC
4BLH-CUM05R5CN1
L504
4BLH-CUN05R5BN1
P303 P302
P301
E902
E901
C307
221K
C305
331K
C374 101J
C324 101J
C366 152J
C316
152J
C368
152J
C318
152J
Q752
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
SCHEMATIC DIAGRAM
U
E-155
L516
BLM21P221SG
L506
BLM21P221SG
BLM21P221SG
L355
BLM21P221SG
L356
BLM21P221SG
L351
BLM21P221SG
L352
BLM21P221SG
L353
BLM21P221SG
L302
BLM21P221SG
L301
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
1
3
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D751
1SS352
R523 0
R522 0
R521 0
R311
0
R356
0
R355
0
R520
0
R510
0
R372
470
0
R505
0
R303
0
R324 330KR374 330K
R317
0
R312
0
R322
470
R373
470
R323
470
R309
0
R506
0
R301 330K R307
4.7K
R305
680
R304 100K
R302
1K
R308
33K
R392
1K
R306
1K
R327 8.2K
R377
R387
6.8K
R337
6.8K
R347 100K
R714
R397
100K
R338
10K
R351
33
R352
33
R388
10K
R314
0
R389 22K
R364
0
R339 22K
R365
33K
R315
33K
R336
22K
R385 82K
R335 82K
R386
22K
R393
33
R343
33
R310 100K
R361 100K
R362 100K
R325 4.7K
R375 4.7K
R332
100K
R382
100K
R320
10K
R370
10K
R318
2.2K
R319
2.2K
R368
2.2K
R369
2.2K
R321
4.7K
R371
4.7K
R334
33
R394
33
R316 100K
R753 0
R366 100K
(NO USE)
R752
10K
C548
101J
C547
102J
C525
102J
C526
101J
C523
102J
C556
101J
C555
102J
C527
102J
C528
101J
C524
101J
C544 101J C545 101J C546 101JC763
180J C762 104Z
C764 180J
102J
101J
C538 101J
C515
102J
C516
101J
C514
101J
C513
102J
C519
C517
C518
C551
102J
C552
101J
C554
101J
C553
102J
C756 104Z
C755
103K
C303
47/16
C302 100/6.3
C315
47/16
C365
47/16
C352
220/16
C358 220/6.3
C308 220/6.3
C363
47/16
C313
47/16
C304 47/16
C311 10/16
C757
10/16
C761
220/6.3
C351
220/16
C361
47/16
C362
47/16 C369
47/16
C319
47/16
C206
100/16
C205
10/50
C331
47/16
C332
47/16
C760 10/16
C758
10/16
C759
10/16
Q751
UDA1325
ALE 50
CLK27 DA 57
NC1 45
NC2 46
P0.0 56
P0.1 58
P0
.
260
P2.629
P2.730
RTCB 36
TC 35
VDDA1 38
VDDA2 42
VDDA3 52
VDDO
32
VDDX
28
VINL 43
VINR 47
VOUTL 34
VOUTR 37
VREF[AD] 41
VREF[DA] 40
VRN 49
VRP
51
VSSA1 39
VSSA2 44
VSSA3 55
VSSO 33
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B
26
EA 48
PSEN31
Q301
NJM4565M-D
(1/2)
3
8
2
1
Q359
NJM2140R
(1/2)
5
8
6
7
Q358
NJM2140R
(1/2)
3
8
2
1
Q352
NJM2140R
(1/2)
38
2
1
Q301
NJM4565M-D
(2/2)
5
6
4
7
Q359
NJM2140R (2/2)
3
2
4
1
Q358
NJM2140R
(2/2)
5
6
4
7
Q352
NJM2140R
(2/2)
5
6
4
7
Q389
RN1444-A
Q388
RN1444-A
Q387
RN1444-A
Q386
RN1444-A
Q353
RN1444-A
Q354
RN1444-A
R313 50K (A)
(2/2)
R313 50K (A)
(1/2)
D206
UDZ5.6B
C301
4.7/35
Q754
TC7WU04
7
Q754
TC7WU04
62
+5A
-5V
+3.3D +3.3A
+5A
-5V
CDCRST
U55UJJ 155UJJ U55UDD
R521
R522
R523
UDDUJJ
ohm309, 506505,R303,
C514,516
C513,515
L301,302
L504
Rch
Lch
520
556
555
548, 554,552,
547, 553,551,
510,356,
C523, 527,525,
355,317,312,R311,
528,526,C524,
L351-353,355,356,506,516
(ECHU)
541
Rch
Lch
507-509 ohm
542
384,383,R381,
529,522,520,C518,
521,519,C517,
L505
L381-383
UDDUJJ
ohm
UDDUJJ
Lch
Lch
Rch
Rch
R(1VrmsFS)
L(1VrmsFS)
MIC IN
LINE OUT
R(2VrmsFS)
LINE IN
L(2VrmsFS)
-5V
GND
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : LINE/MIC)
L505
Q706
74HCT7007
3
4
Q706
74HCT7007 11
10
Q706
74HCT7007 9
8
Q706 74HCT7007
5
6
Q706
74HCT7007 13
12
7
Q706
74HCT7007
1
2
14
POWER MODE
OPT/COAX
NC
I2C_SDA_D
I2C_SCL_D
MCU_MUTE
UPLED
PROTECT
I2C_SCL_A
I2C_SDA_A
DIG/ANA
INH
Output only
MB89135A
MIC/LINE
MODE
AVR
Avss
EPROM_WR
WIN/MAC
CDCD+
ONK/KORG
P_ON_RST
CDCRST
DRC_DA
DIT_C3
SRC_RST
DIT_C15
WAV/DIR
DIT_C2
SRC_LD CLK X1A
AVcc
Nch Open drain
Vss
X0A Vcc X1 X0 MOD1 MOD0 RST
Q701
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
S703
X701
4MHZ
S701S702
E904
P702
Q708
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
P381
L383
L382
L381
L754
NCH-1470
D301
SFPJ63
D701
1SS352
Q384
RN1402
R381
0
R508
R509
R507
R384
R383
R380 100K R330 100K
R379
33
R329
33
R348
39K
R327 8.2K
R328 39K
R378 39K
R398
39K
R377
8.2K
R396
470
R395
470
R390
560
R391
560
R753 0
R730
10K
C309 105M
C359 105M
C541
C542
101J
C521
C529
C522
C520
C519
C517
C518
C706
104Z
C702
104Z
C705 104Z
C703
104Z
C704
104Z
C701 104Z
C755
103K
C372
47/16
C322
47/16
C360 22/6.3
C310 22/6.3
C321
10/16
C371
10/16
C306
470/6.3
Q383
NJM3414A
(1/2)
38
2
1
Q383
NJM3414A
(2/2)
5
6
4
7
Q382
RN1444-A
Q381
RN1444-A
R326
50K(A)
(1/2)
R326
50K
(A)
(2/2)
D702
UDZ3.3B
Q704
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q705
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q754
TC7WU04
62
R754 6.8K
R718 10K
R715 10K R716 10K R717 10K R708 10K
R703
10K
R704 0
R743 0R702
10K
R706
10K
R746 15K
R701 2.7K
R700 10K
R705 10K
R713 10K
R709
390
R710
470
R711
820
R729
10K
R707 0
R744 6.8K
R745
3.9K
Q385
RN2401
Q711
RN2401
C
D
CDCRST
MCU_MUTE
MIC/LINE
INH
MODE
CDCD+
P_ON_RST
OPT/COAX
WIN/MAC
WIN/MAC
+5D
I2C_SDA I2C_SCL
ONK/KORG
PROTECT
POWERMODE
EPROM_WR
EPROM_WR
I2C_SCL_D
I2C_SDA_D
I2C_SCL_A I2C_SDA_A
DIG/ANA
I2C_SCL_A
I2C_SDA_A
EPROM_WR
OPT/COAX CDCRST
UP_LED SRC_DA
I2C_SCL_D
MCU_MUTE
I2C_SDA_D
DIT_C3
MODE
DIT_C2
I2C_SCL_A
DIT_C15
I2C_SCL_D
WAV/DIR
INH I2C_SDA_A
I2C_SDA_D
MIC/LINE
DIG/ANA
RESET
SRC_LD
SRC_RST
CLK
(NO USE)
(NO USE)
NO USE
DIGITAL
507-509 ohm
542
384,383,R381,
529
,
522
,
520
,
C518
,
M24C16M24C16
ANALOG
MONITOR
INTERNAL
OPT/COAX SW
INPUT SELCTOR
MIC
LINE
PHONES
WIN/MAC SW

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : MONITOR)
DAC
C9/C15
P401
Q200
2SA1162-Y
Q201
2SC2712-Y
11 10
98
13 12
56
34
Q357
74HC04
12
7
14
Q902
SI-3033LUS
G
IO
Q903
SI-3033LUS
G
IO
Q901
SI-3050F
G
1
INOVC VOS
E903
C200
102J
Q402
CS8404A
C/SBF 10
C6/C2 4
C7/C3 1
CBL/SBC15
EM0/C914
EM1/C813
FSYNC 7GND18
M021
M122
M223
MCK 5
SCK 6
SDATA 8
TRNPT/FC1
24
TXN
17
TXP20
U11
V9
VD+
19
C1/FC0 3
12
PRO 2
RST16
Q753
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE7
XCOM 14
YCOM 15
ZCOM
4
AIL4
AIR5CL47
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C6
FOC 56
FOD 55 FOW 54
LOCK 48
VDDA13
VDDD6 52
VSSA12
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
MODEL NO SE-U55/UE-155
P901
L752
BLM21A102F
L751
BLM21A102F
L502
BLM21B221SB
L501
BLM21B221SB
L503
BLM21B221SB
L901
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
L401
47UH
NCH-1479
F901
ICP-S2.3
D903
SFPJ63
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D200
1SS352
D201
1SS352
D403
D901
SFPJ63
D902 SFPJ63
D401
1SS352
D402
Q905
RN1402
R511
0
R512
0
R513
0
R514
0
R515
0
R516
0
R517
0
R518
0
R519
0
R502
0
R504
0
R503
0
R407 75
R501
1K
R408
75
R714
0
R907 0
R914
0.22
(1W)
R207
1K
R206
1K
R205
1K
R204
1K
R202
2.2K R203
2.2K
R201
4.7K
R200
10K
R905
10K
R902
1K
R901
10K
R913
330
R911
330
R753 0
R904
10K
R903
22K
R751
1M
R912
0
R404 2.2K
R403 2.2K R402 2.2K
Q904
M51957B
CAP 5GND4
IN
2
NC1
1
NC2
3
NC3 8
OUT 6
VCC 7
C546 101JC763
C764 180J
C543 105M
C512
473Z
C511
223Z
C510
102J
C509
331J
C752
104Z
C751
104Z
C540
101J
C539
101J
C538 101J
C534 101J
C535 101J C536 101J C537 101J
C530 101J
C502
102J
C503
101J
C505
101J
C506
102J
C507
101J
C508
102J
C501
101J
C504
102J
C413 472K
C417
104Z
C913 104Z
C414 104Z
C202
102J
C201
102J
C768 472K
C767 103K
C766 333K
C753
050C
C904
104Z
C756 104Z
C754
050C
C755
103K
C415
104Z
C765
104Z
C905 1/50
C410
0.1/50
C910
0.47/50
C901 10/16
C206
100/16
C205
10/50
C204
10/50
C203
10/50
C401
47/16
C903
470/6.3
D904 SLR-332MC
U401
TORX178A
U402
TOTX178
Q751
UDA1325
BCK 61
CLK27
D+8
D-6
DA 57
GP0/BCKI17
GP1/DI13
GP2/DO 63
GP3/WSO
1
GP4/BCKO
2
GP5/WSI15
P0.0 56
P0.1 58 P0.2 60 P0.3 62
P0.4
64
P0.53
P0.6
5
P0.7
7
P2.0
14
P2.1
16
P2.2
18
P2.3
20
P2.4
22
P2.5
23
P2.6
29
P2.730
SCL
19
SDA21
SHTCB4
VDDE12
VDDI9
VDDX
28
V
V
R
V
R
VSSA3 55
VSSE11
VSSI10
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B26
PSEN31
X751
48M
D406 D405
UDZ3.3B
D404
C412
22/16
L402
NSRF-2046
Q754
TC7WU04
17
4
8
Q754
TC7WU04
62
Q754
TC7WU04
35
R411 680
R410 680
R409 680
R414 1.5K
R413 1.5K
R412 1.5K
0
1
7
+3.3D
+3.3A
+5A
RESET
DI
DO
BCKI
WSI
+5D
BCKO
128FS
DIT_C3 DIT_C2
DIT_C15
UP_LED
SRC_DA SRC_LD
SRC_RST
CLK
RESET
WAV/DIR
BCKO
WSO
DO
R714 100
UDDUJJ
BK1608LL241-T
C534-540
R511-519 ohm
544-546 101J
NO USE
101JC530
UJJ UDD
UJJ UDD
(UDD= )
C905
C543
UJJ UDD
ohm
C502,504,506,508
R502-504
C512
C511
C510
C509
L501-503
C501,503,505,507
0
UJJ UDD
NC
OUTPUT
OPTICAL
INPUT
OPTICAL
1.5A
7.5V
DC IN
COAXIAL
INPUT
OUTPUT
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : MONITOR)
L807
4BLH-CUM05R5CN1
Q401
TDA1373H
AIL4
AIR
5
AOL19
AOR1
15
BS 34
CEN 35
CL 47
CLD18
CLI23
CLO1
27
CLO2
28
CLO330 CLO4
31
CUS 36
DA 46
DI1D 62 DI1O 63
DI1S
1
DI2C 60 DI2D 57 DI2W 59
DO1C
51
DO1D 50
DO1W 49
DO2C
6
DO2D
10
DO2W
16
EM 37
FOC 56
FOD 55 FOW 54
FSL25
LD 45
LOCK 48
MU 44
SA 43
TST1 42
TST2 41
VDDA13
VDDA4
19
VDDD17
VDDD211
VDDD314
VDDD4
32
VDDD5 39
VDDD6 52
VSSA12
VSSA4
20
VSSD18
VSSD10 53 VSSD11 58 VSSD12 61
VSSD13
64
VSSD212
VSSD313
VSSD417
VSSD524 VSSD626
VSSD729
VSSD8
33
VSSD9 40
XTLI21 XTLO
22
RST 38
L801
BLM21P221SG
L802
L754
NCH-1470
F801
ICP-S1.0
D710 1SS352
R837 0
R819 1.5K
R838 0
R802 15
R801 15
R908
0.33 (1W)
R846 0
R847 0
R415
560
R405
1M
R753 0
R751
1M
R404 2.
2
R403 2.
2
R402 2.
2
C911
104Z
C534 101J
C535 101J C536 101J C537 101J
C912 104Z
C768 472K
C419
103K
C418 223K
C409
104Z
C405
080D
C406
080D
C403
104Z
C767 1
0
C7
6
C753
050C
C754
050C
C755
103K
C402
104Z
C404
104Z
C420
220/6.3
C401
47/16
X401
33.8688MHZ
X751
48M
P801
+V 1
D+ 3
D- 2
GND 4D802
UDZ5.6B
D801
UDZ5.6B
4Q754
TC7WU04
62
Q754
TC7WU04
35
R401
4.7
+3.3D
+5D
D1+
I2C_SCL I2C_SDA
D1-
CDCD+
+5D
+3.3D
4BLH-CUN05R5BN1
UJJ UDD
0ohmR846,847
L807
NCAR-7035
USB UP
INPUT SELECTOR : MONITOR
BY MARK ARE CRITICAL FOR SAFETY IDENTIFIED
NOTE
THE COMPONENTS
REPLACE ONLY WITH PART NUMBER SPECIFIED.
.
.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
.
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
.
ELECTROLYTIC CAPACITORS ( )ARE IN F/WV.
.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030 3pF 330 33pF 331 330pF
u
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
.
.
333 0.033uF

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : MONITOR)
DAC
4BLH-CUM05R5CN1
L504
4BLH-CUN05R5BN1
P303 P302
P301
E902
E901
C307
221K
C305
331K
C374 101J
C324 101J
C366 152J
C316
152J
C368
152J
C318
152J
Q752
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
SCHEMATIC DIAGRAM
U
E-155
L516
BLM21P221SG
L506
BLM21P221SG
BLM21P221SG
L355
BLM21P221SG
L356
BLM21P221SG
L351
BLM21P221SG
L352
BLM21P221SG
L353
BLM21P221SG
L302
BLM21P221SG
L301
BLM21P221SG
L753
BLM21A102F
L754
NCH-1470
1
3
D205
1SS352
D204
1SS352
D203
1SS352
D202
1SS352
D751
1SS352
R523 0
R522 0
R521 0
R311
0
R356
0
R355
0
R520
0
R510
0
R372
470
0
R505
0
R303
0
R324 330KR374 330K
R317
0
R312
0
R322
470
R373
470
R323
470
R309
0
R506
0
R301 330K R307
4.7K
R305
680
R304 100K
R302
1K
R308
33K
R392
1K
R306
1K
R327 8.2K
R377
R387
6.8K
R337
6.8K
R347 100K
R714
R397
100K
R338
10K
R351
33
R352
33
R388
10K
R314
0
R389 22K
R364
0
R339 22K
R365
33K
R315
33K
R336
22K
R385 82K
R335 82K
R386
22K
R393
33
R343
33
R310 100K
R361 100K
R362 100K
R325 4.7K
R375 4.7K
R332
100K
R382
100K
R320
10K
R370
10K
R318
2.2K
R319
2.2K
R368
2.2K
R369
2.2K
R321
4.7K
R371
4.7K
R334
33
R394
33
R316 100K
R753 0
R366 100K
(NO USE)
R752
10K
C548
101J
C547
102J
C525
102J
C526
101J
C523
102J
C556
101J
C555
102J
C527
102J
C528
101J
C524
101J
C544 101J C545 101J C546 101JC763
180J C762 104Z
C764 180J
102J
101J
C538 101J
C515
102J
C516
101J
C514
101J
C513
102J
C519
C517
C518
C551
102J
C552
101J
C554
101J
C553
102J
C756 104Z
C755
103K
C303
47/16
C302 100/6.3
C315
47/16
C365
47/16
C352
220/16
C358 220/6.3
C308 220/6.3
C363
47/16
C313
47/16
C304 47/16
C311 10/16
C757
10/16
C761
220/6.3
C351
220/16
C361
47/16
C362
47/16 C369
47/16
C319
47/16
C206
100/16
C205
10/50
C331
47/16
C332
47/16
C760 10/16
C758
10/16
C759
10/16
Q751
UDA1325
ALE 50
CLK27 DA 57
NC1 45
NC2 46
P0.0 56
P0.1 58
P0
.
260
P2.629
P2.730
RTCB 36
TC 35
VDDA1 38
VDDA2 42
VDDA3 52
VDDO
32
VDDX
28
VINL 43
VINR 47
VOUTL 34
VOUTR 37
VREF[AD] 41
VREF[DA] 40
VRN 49
VRP
51
VSSA1 39
VSSA2 44
VSSA3 55
VSSO 33
VSSX24
WS 59
XTAL1A 54
XTAL1B25
XTAL2A 53
XTAL2B
26
EA 48
PSEN31
Q301
NJM4565M-D
(1/2)
3
8
2
1
Q359
NJM2140R
(1/2)
5
8
6
7
Q358
NJM2140R
(1/2)
3
8
2
1
Q352
NJM2140R
(1/2)
38
2
1
Q301
NJM4565M-D
(2/2)
5
6
4
7
Q359
NJM2140R (2/2)
3
2
4
1
Q358
NJM2140R
(2/2)
5
6
4
7
Q352
NJM2140R
(2/2)
5
6
4
7
Q389
RN1444-A
Q388
RN1444-A
Q387
RN1444-A
Q386
RN1444-A
Q353
RN1444-A
Q354
RN1444-A
R313 50K (A)
(2/2)
R313 50K (A)
(1/2)
D206
UDZ5.6B
C301
4.7/35
Q754
TC7WU04
7
Q754
TC7WU04
62
+5A
-5V
+3.3D +3.3A
+5A
-5V
CDCRST
U55UJJ 155UJJ U55UDD
R521
R522
R523
UDDUJJ
ohm309, 506505,R303,
C514,516
C513,515
L301,302
L504
Rch
Lch
520
556
555
548, 554,552,
547, 553,551,
510,356,
C523, 527,525,
355,317,312,R311,
528,526,C524,
L351-353,355,356,506,516
(ECHU)
541
Rch
Lch
507-509 ohm
542
384,383,R381,
529,522,520,C518,
521,519,C517,
L505
L381-383
UDDUJJ
ohm
UDDUJJ
Lch
Lch
Rch
Rch
R(1VrmsFS)
L(1VrmsFS)
MIC IN
LINE OUT
R(2VrmsFS)
LINE IN
L(2VrmsFS)
-5V
GND
GND

SE-U55
SCHEMATIC DIAGRAM (INPUT SELECTOR : MONITOR)
L505
Q706
74HCT7007
3
4
Q706
74HCT7007 11
10
Q706
74HCT7007 9
8
Q706 74HCT7007
5
6
Q706
74HCT7007 13
12
7
Q706
74HCT7007
1
2
14
POWER MODE
OPT/COAX
NC
I2C_SDA_D
I2C_SCL_D
MCU_MUTE
UPLED
PROTECT
I2C_SCL_A
I2C_SDA_A
DIG/ANA
INH
Output only
MB89135A
MIC/LINE
MODE
AVR
Avss
EPROM_WR
WIN/MAC
CDCD+
ONK/KORG
P_ON_RST
CDCRST
DRC_DA
DIT_C3
SRC_RST
DIT_C15
WAV/DIR
DIT_C2
SRC_LD CLK X1A
AVcc
Nch Open drain
Vss
X0A Vcc X1 X0 MOD1 MOD0 RST
Q701
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
S703
X701
4MHZ
S701S702
E904
P702
Q708
74HC4053
0X 12
0Y2
0Z5
1X 13
1Y1
1Z3
A11
B10
C9GND8
INH6
VCC 16
VEE
7
XCOM 14
YCOM 15
ZCOM4
P381
L383
L382
L381
L754
NCH-1470
D301
SFPJ63
D701
1SS352
Q384
RN1402
R381
0
R508
R509
R507
R384
R383
R380 100K R330 100K
R379
33
R329
33
R348
39K
R327 8.2K
R328 39K
R378 39K
R398
39K
R377
8.2K
R396
470
R395
470
R390
560
R391
560
R753 0
R730
10K
C309 105M
C359 105M
C541
C542
101J
C521
C529
C522
C520
C519
C517
C518
C706
104Z
C702
104Z
C705 104Z
C703
104Z
C704
104Z
C701 104Z
C755
103K
C372
47/16
C322
47/16
C360 22/6.3
C310 22/6.3
C321
10/16
C371
10/16
C306
470/6.3
Q383
NJM3414A
(1/2)
38
2
1
Q383
NJM3414A
(2/2)
5
6
4
7
Q382
RN1444-A
Q381
RN1444-A
R326
50K(A)
(1/2)
R326
50K
(A)
(2/2)
D702
UDZ3.3B
Q704
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q705
BR24C16F
GND4
S01
S12
S23SCL6
SDA 5
VCC 8
WC 7
Q754
TC7WU04
62
R754 6.8K
R718 10K
R715 10K R716 10K R717 10K R708 10K
R703
10K
R704 0
R743 0R702
10K
R706
10K
R746 15K
R701 2.7K
R700 10K
R705 10K
R713 10K
R709
390
R710
470
R711
820
R729
10K
R707 0
R744 6.8K
R745
3.9K
Q385
RN2401
Q711
RN2401
C
D
CDCRST
MCU_MUTE
MIC/LINE
INH
MODE
CDCD+
P_ON_RST
OPT/COAX
WIN/MAC
WIN/MAC
+5D
I2C_SDA I2C_SCL
ONK/KORG
PROTECT
POWERMODE
EPROM_WR
EPROM_WR
I2C_SCL_D
I2C_SDA_D
I2C_SCL_A I2C_SDA_A
DIG/ANA
I2C_SCL_A
I2C_SDA_A
EPROM_WR
OPT/COAX CDCRST
UP_LED SRC_DA
I2C_SCL_D
MCU_MUTE
I2C_SDA_D
DIT_C3
MODE
DIT_C2
I2C_SCL_A
DIT_C15
I2C_SCL_D
WAV/DIR
INH I2C_SDA_A
I2C_SDA_D
MIC/LINE
DIG/ANA
RESET
SRC_LD
SRC_RST
CLK
(NO USE)
(NO USE)
NO USE
DIGITAL
507-509 ohm
542
384,383,R381,
529
,
522
,
520
,
C518
,
M24C16M24C16
ANALOG
MONITOR
INTERNAL
OPT/COAX SW
INPUT SELCTOR
MIC
LINE
PHONES
WIN/MAC SW

SE-U55
PC BOARD VIEW PARTS LIST
CIRCUIT NO. DESCRIPTION PART NUMBER
D200~D205 1SS352, C-DIODE or 223234R2 or
1SS355, C-DIODE 223269R2
D206 UDZ5.6B, ZENER D 224490560R2
D301 SFPJ-63, DIODE 223271R2
D401~D403 1SS352, C-DIODE or 223234R2 or
1SS355, C-DIODE 223269R2
D404~D406 UDZ3.3B, ZENER D or 224490330R2 or
RD3.3SB2, ZENER D 224370332R2
D701 1SS352, C-DIODE or 223234R2 or
1SS355, C-DIODE 223269R2
D702 UDZ3.3B, ZENER D or 224490330R2 or
RD3.3SB2, ZENER D 224370332R2
D710, D751 1SS352, C-DIODE or 223234R2 or
1SS355, C-DIODE 223269R2
D801, D802 UDZ5.6B, ZENER D 224490560R2
D901~D903 SFPJ-63, DIODE 223271R2
D904 SLR-332MC3F, LED 225332
F801 ICP-S1.0, FUSE 252223R2
F901 ICP-S2.3, FUSE 252226R2
L301, L302 BLM21P221SG, CHOKE COIL 230949R2
L351~L353 BLM21P221SG, CHOKE COIL 230949R2
L355, L356 BLM21P221SG, CHOKE COIL 230949R2
L381~L383 BLM21P221SG, CHOKE COIL 230949R2
L401 NCH-1479, CHOKE COIL 231237K470R2
L402 NSRF-2046, MPX COIL 232136
L501 BLM21B221SB, CHOKE COIL 230947R2
L504, L505 NMBL-003, BLN COIL 233532R2
L506, L516 BLM21P221SG, CHOKE COIL 230949R2
L751~L753 BLM21A102F, CHOKE COIL 230948R2
L754 NCH-1470, CHOKE COIL 231237M015R2
L801, L802 BLM21P221SG, CHOKE COIL 230949R2
L807 NMBL-003, BLN COIL 233532R2
P301 YKB21-5181, JACK 25045579
P302, P303 NPJ-2PDR446, PIN JACK 25045641
P381 YKB21-5182, JACK 25045388
P401 NPJ-2PDO445, PIN JACK 25045640
P801 NSCT-4P2179, SOCKET 25052282
P901 HEC0470-01-630, JACK 25045598
Q200 2SA1162-Y, TR 2214374R2
Q201 2SC2712-Y, TR 2213144R2
Q301 NJM4565M-D, IC 22241383R2
Q352 NJM2140R, IC 22241311R2
Q353~Q354 RN1444-A, TR 2216031R2
Q357 74HC04, IC 222740045R2
Q358 NJM2140R, IC 22241311R2
Q359 NJM2140R, IC 22241311R2
Q381~Q382 RN1444-A, TR 2216031R2
Q383 NJM3414AV, IC 22241469R2
Q384 RN1402, TR 2214470R2
Q385 RN2401, TR 2214520R2
Q386~Q389 RN1444-A, TR 2216031R2
Q401 TDA1373H, IC 22241428R3
Q402 CS8404A, IC 22241429R2
Q701 MB89135L-611, IC 22241557AR2
Q704 M24C16-WMN6T, IC or 22241431R2 or
BR24C16F, IC 22241430R2
Q705 M24C16-WMN6T, IC or 22241431R2 or
BR24C16F, IC 22241430R2
Q706 TC74HCT7007AF, IC 222740077R2TO
Q708 TC74HC4053FP, IC 22241228R2
CIRCUIT NO. DESCRIPTION PART NUMBER
Q711 RN2401, TR 2214520R2
Q751 UDA1325H, IC 22241312R3
Q752, Q753 TC74HC4053FP, IC 22241228R2
Q754 TC7WU04FU, IC 22240935R2
Q901 SI-3050F, IC 22241561
Q902, Q903 SI-3033LUS, IC 22278033CR2
Q904 M51957BFP, IC 22241239R2
Q905 RN1402, TR 2214470R2
R313, R326 N09RGL50KA20F, VARI R 5112486
R511~R519 BK1608LL241-T, EMIFIL 230959R1
R908 RNU1WCJ-0.33, METAL R 453633394
R914 RNU1WCJ-0.22, METAL R 453632294
S701, S702 NSS-22203, SLIDE SW 25065581
S703 NRSF-224-20U, ROT SW 25030419
U401 TORX178B, PHT CP 24120037
U402 TOTX178A, PHT PARTS 24120031
X401 HC-49U/03 33.8688MHz, 3010325
CRYSTAL
X701 CST4.00MGW, CERA LOCK 3010150
X751 HC-49/U03 48.000MHz, 3010328
CRYSTAL

SE-U55
Microprocessor terminal descriptions
No. Pin!Name I/O Functio
n
1 3.3V +3.3V
2 RESET I Reset!in
p
ut!
(
RESET:"L"
)
3 GND I GND
4 GND I/O GND
5 4MHz I External!4MHz!clock!in
p
ut
6 4MHz I External!4MHz!clock!in
p
ut
7 3.3V +3.3V
8 GND GND
9 X1A O
p
en
10 CLK O CLK!si
g
nal!out
p
ut!of!SRC
(
TDA1373H
)
11 SRC_LD O LD!si
g
nal!out
p
ut!of!SRC
(
TDA1371H
)
12 SRC_RESET O Reset!out
p
ut!of!SRC
(
TDA1373H
)
13 WAV/DIR O CODEC!output!(WAVE!or!MONITOR)!select!signal!output
(
WAVE!:!"H"
)
14 DIT!C15 O To!DIT!C15
p
in
15 DIT!C2 O To!DIT!C2
p
in
16 (NO!USE) O O
p
en
17 DIT!C3 O To!DIT!3
p
in
18 (NO!USE) I GND
19 GND GND
20 SRC_DA I/O Serial!data!of!SRC81373H
)
!in
p
ut/out
p
ut
21 CODEC!RST I/O To!VREF!of!USB!CODEC
(
UDA1325
)
22 DIG_ANA O EEPROM!for!USB!CODEC!select!si
g
nal!out
p
ut
23 I2C!SDA!A I/O SDA!
p
ort!for!EEPROM!writin
g
.
24 I2C!SCL!A I/O SCL!
p
ort!for!EEPROM!writin
g
.
25 I2C!SDA!D I/O
SDA!port!for!EEPROM!writing!for!DIGITAL!setup.!Usually,!i
t
considers!as!an!input!and!becomes!SDA!input!and!output!at!the
time!of!writin
g
.
26 I2C!SCL!D I/O SCL!port!for!EEPROM!writing!for!DIGITAL!setup.!Usually,!i
t
considers!as!an!in
p
ut!and!becomes!SCL!out
p
ut!at!the!time!of
27 (NO!USE) I GND
28 EPROM!WR I/O
EEPROM!write-in!control!port.!Usually,!it!is!an!input!port,!and
immediately!after!reset,!when!this!is!"L",!"L"!is!outputted!and
EEPROM!is!written!in.
29 (NO!USE) I GND
30 MAC/WIN I The!settin
g
!switch!
(
H:WIN,!L:MAC
)
!of!WIN/MAC.
31 ONK/KORG I Co
py
ri
g
ht!out
p
ut!
p
rotection.!
(
H:normal!mode
)
32 PROTECT I Existence!of!co
py
ri
g
ht!
p
rotection!information.!
(
H:normal!mode
)
33 PON_RST O Power-on!reset.
34 CODEC!D+ I/O D+!of!USB!CODEC!(UDA1325)!is!controlled.!Usually,!it!is!"H"
and!D+!is!
g
rounded!throu
g
h!a!diode!b
y
!"L."
35 (NO!USE) I GND
36
P
OWER!MOD
E
IA!setup!of!POWER!MODE!of!USB.
L:!BUS!POWER!H:SELF!POWER.
37 (NO!USE) I GND
38 (NO!USE) I GND
39 (NO!USE) I GND
40 OPT/COAX I The!change!switch!of!OPTICAL!and!COAXICAL.
H:!COAXICAL!and!L:OPTICAL.
41 UPLED O Li
g
ht!Emittin
g
!Diode!dis
p
la
y
!of!UP!
(
the!li
g
ht!is!switched!on!b
y
42 MCU!MUTE O MCU
_
MUTE!
(
it!is!MYUTO!o
p
eration!at!"L"
)
.
43 GND GND
44 3.3V 3.3V
45 MODE I The!change!switch!of!MONITOR/INTERNAL/LINE/Medi
a
Interface!Connector.
46 (NO!USE) O GND
47 INH O Prohibition!of!an!analo
g
!in
p
ut!
(
it!forbids!b
y
!"H"
)
.
48 MIC/LINE O An!input!change!of!Media!Interface!Connector/LINE.
H:!Media!Interface!Connector
,
!L:LINE.

SE-U55
PACKING-1
Assembly Method
1 Factory-shipped condition
FUNCTION SELECTOR dial LINE
INPUT LEVEL adjustment dial MIN
PHONES LEVEL adjustment dial MIN
DIGITAL IN COAX/OPT selector OPT (Rear side)
WIN/MAC selector WIN (Bottom side)
2 Serial No. of LABEL(POS) AS is stuck on CASE (R).
3 A set is put into POLY BAG, and a tape is stuck and it fixes.
It is staging the printing side of POLY BAG, putting in a set,
and bending a portion to CASE (R) side not much.
Parts Number Parts Name
29362765 LABEL(POS)AS
29100097-1A POLY BAG(350 X250)
29110149 TAPE(SEROHAN)
FUNCTION SELECTOR dial LINE
INPUT LEVEL adjustment dial MIN
PHONES LEVEL adjustment dial MIN DIGITAL IN COAX/OPT selector
OPT
WIN/MAC selector
WIN (Bottom side)
UP
FUNCTION SELECTOR
INTERNAL
LINE
MIC
MONITOR
DIGITAL
INPUTLEVEL
PHONELEVEL
MAX
MAX
MIC
PHONES
USB DIGITAL AUDIO
PROCESSOR
SE-U55
WIN
MAC
IN
OUT
IN
OUT
OPTICAL
COAXIAL
DIGITAL
UP USB
DIGITAL IN
DCIN 7.5V
ANALOG
COAX
OPT
L
R
L
R
LINE OUT
LINE IN
LABEL(POS)AS
TAPE (SEROHAN)

SE-U55
PACKING-2
PIN CORD AS(0.8MT)
Assembly Method
4 It puts in in the order of INS MANUAL J(SE-U55),INS MANUAL J(CarryOnMusic),
WRANTY CARD,CD-ROM(SE-U55),CORD AS(NCS-1P150),CORD AS(USB-1M),
PIN CORD AS into POLY BAG, and fixes on a tape.
*) POLY BAG is turning a character side down.
Parts Number Parts Name
29100097-1A POLY BAG(350 X 250)
28343006 INS MANUAL J(SE-U55)
29343043 INS MANUAL J(CarryOnMusic)
292163 CD ROM(SE-U55)
29365075B WRNTY CARD
2050066 CORD AS(NCS-1P150)
2010391 CORD AS(USB-1M)
2010385 PIN CORD AS(0.8MT)
29110149 TAPE(SEROHAN)
CORD AS(USB-1M)
CORD AS(NCS-1P150)
CD ROM(SE-U55)
INS MANUAL J(CarryOnMusic)
INS MANUAL J(SE-U55)
POLY BAG(350 X 250)
WRNTY CARD
TAPE(SEROHAN)