Onkyo HTR-550 Service Manual page 4

A
BLOCK DIAGRAMS-1
AUDIO SECTION
1
2
3
DVD (MULTI IN)
4
SURROUND BACK
5
B
<MDD, MDC> Only
XM-RADIO
XM
DAC
XM/DT IC
AK4384
SIRIUS
SIRIUS
MIC AMP
SETUP MIC
(FRONT)
MIC DETECT
L
AUX INPUT
(FRONT)
R
L
CD
R
L
TAPE OUT
R
L
TAPE IN
R
L
CBL/SAT IN
R
L
VCR/DVR OUT
R
L
VCR/DVR IN
R
L
FRONT
R
CENTER
SUBWOOFER
L
SURROUND
R
L
R
IN1
Micro
Controller
HDMI
HDMI IN2
SW
OUT
1
COAXIAL
2
1
OPTICAL
2
C
TUNER UNIT
40
L 59
R
60
L
R
61
62
55
56
53
54
49
50
47
48
45
46
71
72
67
68
-
-
Q341
HT-R550
D
L
37
R
36
FL
FR
C
SL
SR
SW
SBL
SBR
2ch ADC
DIR
Q301
CS42518
Q5503
73
INVERTING
74
INVERTING
75
30
77
33
78
32
76
31
79
29
80
28