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HT-R370

Ref. No. 4131
032009
SERVICE MANUAL


AV RECEIVER
MODEL HT-R370(B)(S)




RC-735M

Black and Silver models
B MDD, B MDC 120V AC, 60Hz
B MMO, S MMO 220-240V AC, 50/60Hz
B MPP 230V AC, 50Hz




SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
HT-R370



EXPLODED VIEW
A354
P901 x 8 pcs. A360
A103 A105
x 4 pcs. x 25 pcs. U004 A350
A056

A070
P101 A256

A262 U002
A342
U010 x 7 pcs.
A062 A340
U0032
A021 x 3 pcs.
F6901C U001-3 A042 A362
F6901 x 2 pcs.
F6902C A036 A044 x 2 pcs.
A101 A6601A F6902 U001 x 2 pcs.
x 4 pcs.
A038 P701 A264
F901 x 2 pcs.
A034 A262
F901C

A225
A050 x 27 pcs. A264
U0033 x 4 pcs. U003 x 2 pcs. A238
x 2 pcs.
A040 A232
A025 x 5 pcs. A230 A236
x 4 pcs. x 2 pcs. A030
A219 A258
A064 x 2 pcs.
U0012 A032
A040 A201
U0011
A040 U0031 A252
x 2 pcs. A205
T901 A221 A213

A215
A217 A250
A001
A036
A060 x 2 pcs. A238
x 3 pcs. A013 x 2 pcs. A330
x 2 pcs. A234
A003 A019 A258 A207 A203
x 4 pcs. A009 x 2 pcs.
A015 x 3 pcs.
A007




HT-R370
x 4 pcs. A260
A005 A011 A069 A040 x 3 pcs.
x 4 pcs. A010 U003-4
TH-R370
A B C D E
BLOCK DIAGRAMS-1(PART-1) AUDIO ANALOG SIGNAL
FRONT L

AUDIO SECTION FRONT R

AUDIO DIGITAL SIGNAL




1
MULTI MEDIA UNIT

MULTI MEDIA
TUNER PACK Q5

85
IN
MULTI




MAIN R
MAIN L




SUB L
86


MIC AUX FL 94




SUBR
TX-SR307 YES YES 82
INVERTING
HT-R370 NO NO 55
43

HT-R570 YES YES
81
54 FR 93

2 FRONT BOARD MIC AMP
MIC Q7401
73 INVERTING 42



72 CEN 95
MICDET

L 78
38

AUX IN
(FRONT IN) 98
R 79


41

71
MINI JACK
(FRONT IN) 97

3 70

40

CD
68
SW 96



69
TAPE OUT 39



66 SL 100




TAPE IN 67
37



SR 99
64
4
36

65
CBL/SAT IN
44

62

45

VCR/DVR OUT
63




60

VCR/DVR IN
61


5 DVD
58
REC R
REC L




59




REC L
COAX 1 90
47

Z2 L
REC R 91
46

Z2 R
76




6 OPT1 75




OPT2 84




83



HDMI
FR FL C SW SL

HDMI IN4
HT-R570 ONLY
LPF




LPF




LPF




LPF
Q401




Q402




Q402




Q403
LPF
Q401




IN4
32
33




31
30




36
37




35
34




28
29




7
16

IN3 -
15
14 2ch ADC
13


-
IN2 49

Micro
Controller HDMI
43
42 8ch DAC
RX 44

IN1 45 DIR
46
48
47
Q301 CS42518
50
OUT HDMI
TX

8
HT-R370
F G H I J K




HEADPHONES
Q5501 R2A15218FP

23 FL

TONE


24 POWER AMPLIFIER SPEAKER TERMINALS

+29dB
FRONT LEFT
21 FR

TONE


20 +29dB
FRONT RIGHT


17 C
+29dB
CENTER


11 SL +29dB
SURR LEFT
12


+29dB
9 SR SURR RIGHT

8


+29dB
15 SW
SUBWOOFER
HT-R370
ONLY
14
+




5
SW-PREOUT SP B LEFT
TX-SR307
ONLY
6



SP B RIGHT
3
RIGHT
2
HP RL
AMUT




CSRL

HP IN
SP B
FRL




RI
INTERFACE RI




Q282 Q281
FLASH ROM SD_RAM
16M Bit 16M bit
38
SDRAM CLK
133MHz




SR




FRONT BOARD
LPF
Q403




BCLK 3.07MHz 142
LRCK 48KHz 144 Q201
117
70
MICOM Q7003
27
26




22
23




21
20




116
DSP 108 DSPCLK DSPCLK 29 7 FLDCLK 7
115
113
TMS320D788E
110 DIGSDO DIGSDI
DIGSDO
59
60
Q701 6 FLDSDO 8
M66005
2
111 DIGSDI SPI
DIGCLK 58 M30627FJPGP
XOUT 12

13




2
3
XIN
XOUT 18

20




10
9
8




62
63 500KHz
XIN




64
17




1
SPI
120
139
141




1

2




C 55 12.288MHz
DSP_RMCLK
XTAL-X701
SO
SI
SO
SI
2
5
Q610
7
EEPROM
8 SPI 6MHz CLK CLK 6
9

61 BCLK 3.07MHz

18 60
54
LRCK 48KHz

I2S(DIR/ADC) 17.734MHz
1
XTAL-X202


59 24.576MHz

1
XTAL-X171
24.576MHz
HT-R370
A B C D
BLOCK DIAGRAMS-2_1 (PART-2_1)
VIDEO SECTION
VIDEO SECTION

1

HT-R570 ONLY
TMDS3
TMDS
CEC
CEC
DDC3
HDMI IN4 DDC
RPWR3
+5V
HPD3
HP DET

TMDS2
TMDS
CEC
CEC
DDC2
HDMI IN3 DDC
RPWR2
+5V
HPD2
HP DET

TMDS1 TMDS
TMDS TMDS
CEC DDC
CEC PS421 CEC
DDC1 RPWR
HDMI IN2 DDC HDMI SW DDC HDMI OUT
RPWR1 HPD S-812C50BUC +5V
2
+5V
HPD1 (Q8805)
HP DET I2C HP DET
+5V Reg
TMDS0
TMDS
CEC
CEC
DDC0
HDMI IN1 DDC
RPWR0
+5V
HPD0
HP DET




Y1

3
CB1



CR1
NJM1326FH2

Y2

PY
CB2
6dB DRV
Y
DRV
CR2

DRV COMPONENT
CB
OUT
COMPONENT VIDEO INPUT
PB
6dB DRV CR

4 DRV

DRV
MONITOR

PR
6dB DRV VCR/DVR
DVD

DRV
COMPOSITE VIDEO OUTPUT
VCR/DVR DRV


CBL/SAT




CV
4/6dB DRV
AUX1
(FRONT)
DRV

5 COMPOSITE VIDEO INPUT
DRV
MUTE
I2C
HT-R370

A B C D E
BLOCK DIAGRAMS-2_2 (PART-2_2)
POWER SUPPLY SECTION
POWER SUPPLY SECTION
1 +3.3V
MPU Board

50mA
I O MPU




G
M.PORT

300mA

PS Board
SUB TRANS
+5V
2 100mA
I O ANALOG VIDEO VIDEO Board




G
1
200mA
CODEC
+3.3V
I O




G
MAIN TRANS
18
VFD
S4
2
DRIVER
HDMI Board
17
+3.3V
FLAC DC-DC +4V
I O
500mA
16 VFD




G
+1.8V HDMI
O I 500mA




G
+3.3V I O




G
S3 +4V
+3.3V
250mA
DC-DC I O




G
DSP
14 -VP
+1.2V SDRAM
500mA
I O FROM




G
VIDEO Board
I O
G




+5V
11




S2
MPU Board
13 DIGITAL
ZENNER +9V 110mA

3
TUNER
TR


OPAMP

+15V
ZENNER +7V
I O
G




TR
ASP
-15V
ZENNER -7V
I O
G




TR
10 S1H+



9 S1L+


ASP& Board
8
S1 +B
7 S1L- Power Amp
-B




HT-R370
4 6 S1H-

POWER AMP
HT-R370

A B C D E
BLOCK DIAGRAMS-2_3 (PART-2_3)
WIRING SECTION


1




JL7101A




JL7101B
9P CABLE




P701B
33P FFC

DISPLAY
BADIS-0037
33P FFC




BADIS-0036


HP JACK
BAETC-0040
JL6605A




5P or 2P CABLE
CPU 5P CABLE
2
P701A




BADG-0022 JL6605B POWER TRANS
P5504A




P5504B




9P SOCKET




P6900B
33P FFC
AMP
BAAF-0002 BAPS-0004
C6901 C6902 JL9101A JL901A
P5503A




P5503B




9P SOCKET
JL801A BAPS-0003
JL901B
5P CABLE 5P CABLE 9P CABLE

P911(2P)
11P FFC
P5502A




JL9101B
P5502B




JL901A
P101A




15P SOCKET P912(5P)
JL801A 5P CABLE




JL901A
P2001B




26P SOCKET 5P CABLE
7P CABLE
3 VIDEO
P2001A




TUNER UNIT
P5501A




7P SOCKET
P5501B




BADIS-0036 P901
P8001A




PWO SUPPLY
JL801B BAPS-0039
P8001B




24P SOCKET
HDMI
BAHDM-0058



4




HT-R370
HT-R370
A B C D E
SCHEMATIC DIAGRAMS-1 (PART-3) AUDIO ANALOG SIGNAL
FRONT L