Onkyo HTR-550 Service Manual page 6

A B
BLOCK DIAGRAMS-1
AUDIO SECTION
<MDD, MDC> Only
XM-RADIO
XM
DAC
XM/DT IC
AK4384
1
SIRIUS
SIRIUS
MIC AMP
SETUP MIC
(FRONT)
MIC DETECT
L
AUX INPUT
(FRONT)
R
L
CD
R
2
L
TAPE OUT
R
L
TAPE IN
R
L
CBL/SAT IN
R
3
L
VCR/DVR OUT
R
L
VCR/DVR IN
R
L
FRONT
R
CENTER
SUBWOOFER
DVD (MULTI IN)
L
SURROUND
R
4
L
SURROUND BACK
R
IN1
Micro
Controller
HDMI
HDMI IN2
SW
OUT
1
5 COAXIAL
2
1
OPTICAL
2
C D
TUNER UNIT
40
L 59
R 60
L
L
37
R
R
36
61
62
55
56
53
54
49
50
47
48
45
46
71
72
67
68
2ch ADC
-
-
Q341
DIR
Q301
CS42518
E
Q5501
R2S15211FP
SELECTOR/ VOLUME
19
TONE
17
TONE
Q5503
FL
73
7
INVERTING
FR 74
14
INVERTING
75
12
C 30
77
9
SL 33
78
4
SR
32
76
2
SW 31
79
SBL
29
80
SBR 28
8ch DAC
F G
POWER AMPLIFIER
FL
+29dB
FR
+29dB
C
MUTING
+29dB
+29dB
SW
+29dB
SR
+29dB
+29dB
SBL
SBR
INTERFACE
Q282 Q281
FLASH MEMORY SD_RAM
4M Bit 16M bit
MICROPROCESSOR
ES29LV400 M12L16161A
Q201
TMS320DA707
DSP
HT-R550
H
PHONES
L
RELAY
FRONT SPEAKERS
R
CENTER SPEAKER
RELAY
L
SURROUND
SPEAKERS
R
L
SURROUND BACK
RELAY
SPEAKERS
R
L
RELAY
FRONT
SPEAKERS B
R
PREOUT
SUBWOOFER
RI
RI
Q701
M30624MHP