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SE-U55


Ref.No.3692


May 2001
SERVICE MANUAL


USB Digital Audio Processor




SE-U55
UP

FUNCTION SELECTOR
LINE
INTERNAL MIC
MONITOR
DIGITAL




INPUT LEVE
L




MAX

PHONE
LEV EL




MAX

MIC




PHONES




USB
DIG
PRO ITAL AU
CES DIO
SE SOR
-U5
5
SE-U55

Main specifications Accessories
Type USB digital audio processor The SE-U55 comes supplied with the accessories shown below. Make sure that these
Connection method USB (Universal Serial Bus Ver. 1.1)
accessories are present at the time of purchase. The number in parenthesis is the quantity
of that accessory.
Sampling rate
Digital input 32/44.1/48 kHz compatible This instruction manual (1)
Digital output 44.1 kHz Explains operational procedures and the required settings for
SE-U55
Frequency characteristics 0.3 Hz to 20 kHz (+0/-0.5 dB, LINE OUT) Instruction Manual
USB Digital Audio Processor
connecting the SE-U55 to your computer.
Signal-to-noise ratio 100 dB (A-filter)
Thank you for purchasing the Onkyo USB Digital




Total harmonic distortion 0.002% (1 kHz, 0 dB)
Audio Processor.
Be sure to read this instruction manual thoroughly
before operating the unit and always adhere to the
instructions given within during operation. Also,
keep this instruction in a safe place for future
reference.




Output level 1.0 Vrms
Line input level 250 mVrms CarryOn Music instruction manual (1)
Microphone input se4nsitivity 5.0 mVrms Instruction manual for using the supplied software CarryOn
Power supply USB power supply, separately sold DC 7.5 V (exclusive adapter) Music.
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. CD-ROM (1)
Contains the software for using the SE-U55 with a computer
and an on-line instruction manual.
UP

FUNCTION SELECTOR

INTERNAL
LINE
MIC
SE-U55 (1)
MONITOR




The USB digital audio processor. The SE-U55 converts your
DIGITAL




INPUT LEVEL




PHONE
- +

LEVEL
computer's sounds to professional-level high-quality audio
MIC
MIN
sound.
PHONE
S




USB
DIG
ITA
PROC L AUD
ESS
SE-U OR IO
55




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.




Registration Card (1)

Quick Setup guide (1)

Note:
The power supply for the SE-U55 is supplied through the USB cable from the connected computer.
SE-U55

CHASSIS-EXPLODED VIEW
6


4
2 1




3

U1



19


7 5
15

Q7
51


19 17 21
7




7 19

16
18
20


12
10


9 8
7


13


14

7




11
SE-U55

CHASSIS-EXPLODED VIEW 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)
NO USE
Q903
MODEL NO SE-U55/UE-155
L901 Q901 SI-3033LUS
P901 D902 SFPJ63
BLM21P221SG D903 R914 I G O
SI-3050F Q902
R912 +3.3D




R911

R913
C913 0.22




330

330
104Z


F901 SFPJ63 G VC O VOS IN SI-3033LUS 2SA1162-Y
0 ICP-S2.3 (1W)
1 I O




R204
G C904 D200
C910




1K
DC IN Q200




1SS352
0.47/50




R903

22K
12 1SS352 10 C203




C903
104Z




470/6.3




D204
7.5V 13 11
UJJ UDD Q357 10/50
1.5A 1 NC1 NC3 8 R202 R205




10K
R905
L501-503 BLM21B221SB 74HC04
Q905 2 IN VCC 7 2.2K R203 1K




M51957B
14 2




D904 SLR-332MC




Q904
C501,503,505,507 101J 4 6 2.2K 9 8 D203 D205
RN1402 UJJ UDD 1 3 5 Q201 1SS352
3 NC2 OUT 6
C502,504,506,508 102J C543 7 D201 R206 C204 1SS352




10K
R904
4 GND CAP 5




C200
102J
C509 331J 1K 10/50
C905




D202
R200 R201 1SS352




1SS352




100/16
C205



C206
C901 10/16




10/50
105M
C543




C905




102J
C202




R207
1/50




1K
C510 102J




C201
102J
C511 223Z 10K 4.7K




R901


R902
10K


1K
+3.3A
C512 473Z 2SC2712-Y
R502-504 0 ohm GND




0
C509 D901 +5A




R907
C510 SFPJ63
UJJ UDD




RESET
C511
C534-540
C512 101J
544-546
BK1608LL241-T
R511-519
75




0 ohm
P401




L502
R407
C504
C503


C502
C501




R714 0 100

R504 (UDD= )
INPUT
R502
COAXIAL
R503 L501 DI R511




C546
101J
OUTPUT DO R512
R408
C765
C508
C507


C506
C505




75
L503




1 1Y VCC 16




C763
NC