TX-NR906/NA906
SERVICE MANUAL
Ref. No. 4095
082008
AV RECEIVER
MODEL
TX-NR906
MODEL
TX-NA906
TX-NR906
Black, Golden and Silver models
220-240V AC, 50Hz
220-240V AC, 50/60Hz
B MMP, S MMP
S MMT, G MMT
TX-NA906
Black, Golden models
220-240V AC, 50/60Hz
B MMR, G MMR
RC-687M
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.
B MDC, S MDD, G MDT
120V AC, 60Hz
INPUT SELECTOR
LISTENING MODE
ON
STANDBY
G
N
I
T
U
M
Y
A
L
P
S
I
D
GU
IDE
EX I
T
PREV
CH
DIMMER
SAT
TAPE/AMP
SLEEP
MACRO
REMOTE MODE
SUBTITLE
AUDIO
REPEAT
PLAY MODE
--/--- 10
11
12
VIDEO OFF
OPEN/CLOSE
TV
TV CH
TV VOL
PLAYLIST
RANDOM
DVD
AUX
1
AUX
2
GAME/TV
CBL/SAT
VCR/DVR
D. TUN
CD
TUNER
TAPE
PHONO
VCR
VCR
DVD
DVD
HDD
HDD
REC
ENTER
TEST TONE
AUDIO SEL
CH SEL
SURR
DIRECT
THX
PURE A
STEREO
LEVEL+
LEVEL-
L NIGHT
ALL ST
TO
P M
ENU
MEN
U
VOL
CH
DISC
ALBUM
TV
VCR
CABLE
DVD
RECEIVER
CD
+
-
123
ZONE
3
ZONE
2
INPUT
+
-
+10
0
CLEAR
12
3
45
6
78
9
SET
UP
RET
UR
N
Re-EQ
RC-
687M
CDR/MD/DOCK
NET/USB
NET/USB
SP A
SP B
EXPLODED VIEWS-1
TX-NR906/NA906
TX-NR906/NA906
A070
x 4 pcs.
P6800
x 18 pcs.
P6800:
A008
x 3 pcs.
A008
x 3 pcs.
A008
x 3 pcs.
A032
x 2 pcs.
A008
x 2 pcs.
A008
x 15 pcs.
A008
x 2 pcs.
A008
x 2 pcs.
A008
x 2 pcs.
A008
x 2 pcs.
A402
x 6 pcs.
A406
x 3 pcs.
A142
x 2 pcs.
A008
x 5 pcs.
A321
x 2 pcs.
A257
x 2 pcs.
A069
x 4 pcs.
A068
x 4 pcs.
A075
x 3 pcs.
A076
x 4 pcs.
A112
x 55 pcs.
A112
x 8 pcs.
A112
x 2 pcs.
A112
x 2 pcs.
A112
x 7 pcs.
A112
x 2 pcs.
A112
x 4 pcs.
A114
x 2 pcs.
A113
x 3 pcs.
A008
x 2 pcs.
A094
x 2 pcs.
A078
x 3 pcs.
A066
A400
A022
A411
A410
A137
A137
A270
A086
A022
A205
A219
A239
A223
A008
A008
A221
A209
A211
A213
A215
A259
A311
A313
A315
P9008
P204
A207
A217
A201
A261
A008
A253
A256
A251
A255
A301
A303
A281
A104
A100
U10
U15
A018
A110
A022
A022
A022
P2801
P7501
U33
U38
U41
U39
U34
U35
U36
U40
A022
F2501
F2502
U14
U017
DT,MP,MT Type
DT,MP,MT,NA906 Type
DC,DD Type
U06
U09
Q4907
Q4908
U26
U30
U32
A120
U11
U13
U12
U42
U25
U28
U27
U07
U44
U08
U30
P102
P205
F9100
F9000
F9101
F9102
F9203
F9202
F9201
A116
A118
A024
A067
A106
A096
A092
A090
A098
A008
A105
A079
Refer to <Fig-1> in
EXPLODED VIEWS-2
P101
U43
A133A
A008
A128
A124
A126
A420
A133
A132
A072
EXPLODED VIEWS-2
TX-NR906/NA906
TX-NR906/NA906
A001
U04
U05
A022
A021
A021
A055
A058
T902
T903
T904
A038
A062
A048
A022
Q6093
Q6083
Q6063
Q6053
Q6051
Q6081
Q6061
Q6091
Q6056
Q6066
Q6086
Q6096
Q6084
Q6094
Q6054
Q6064
Q6082
Q6092
Q6052
Q6062
Q6095
Q6085
Q6065
Q6055
Q6090
Q6080
Q6060
Q6050
A015
A001
A022
A022
A022
A022
A022
A022
U37
A040
A049
F9301
P062
P061
A044
A014
A120
F6601
F6603
F6602
F6604
A005
x 4 pcs.
A113
x 4 pcs.
A011
x 2 pcs.
A008
x 8 pcs.
A008
x 3 pcs.
A008
x 4 pcs.
A008
x 3 pcs.
A008
x 2 pcs.
A025
A033
U03
U01
U18
U23
U21
U19
U20
U22
U24
U02
U16
U17
A008
x 7 pcs.
A057
x 2 pcs.
A042
x 4 pcs.
A076
x 4 pcs.
A004
A008
A046
x 4 pcs.
A008
x 2 pcs.
A008
x 2 pcs.
A120
A120
A134
A134
A120
A008
x 2 pcs.
A008
x 2 pcs.
A008
x 6 pcs.
A039
x 2 pcs.
A008
x 2 pcs.
Q6080A
x 2 pcs.
Q6050A
x 2 pcs.
A008
x 2 pcs.
A008
x 2 pcs.
A056
x 8 pcs.
A056
x 4 pcs.
A056
x 4 pcs.
A056
x 2 pcs.
A060
x 2 pcs.
A056
x 2 pcs.
A005
x 4 pcs.
A113
x 4 pcs.
A009
x 12 pcs.
A009
x 16 pcs.
<Fig-1>
A064
TX-NR906/NA906
BLOCK DIAGRAMS-1
AUDIO SECTION
TX-NR906/NA906
A
1
2
3
4
5
B
C
DE
FG
H
SPDIF
RX0
RX5
MCH SR
RX6
RX7
D
A
C_FL
D
A
C_SL
D
A
C_SR
D
A
C_SBR
D
A
C_SBL
V_OUT_L
V_OUT_R
D
A
C_FR
DAC FL
MIX L
MIX R
DAC FR
D
A
C_CT
D
A
C_SW
MCH C
DAC C
MCH SW
DAC SW
MCH SL
MAIN L
MAIN R
DAC SL
D
A
C
CT2
D
A
C
SW2
MCH_SBR
MCH_SBL
MCH_SR
MCH_SL
MCH_SW
MCH_CT
CENTER
SURR LEFT
SURR RIGHT
ZONE2 RIGHT
VCR/DVR OUT
TAPE OUT
SURR BACK
FRONT RIGHT
FRONT LEFT
-
FR
ONT
RIGHT(BTL)
+
-
FR
ONT
LEFT(BTL)
+
TAPE
VCR/DVR IN
CBL/SAT
GAME/TV
DVD
OUT
MAIN,SUB
IN 1-4
ch3
ch4
ch14
SURR BACK
or Bi-AMP LEFT
or Bi-AMP RIGHT
RS-232
TRANCEIVER
RS-232
Q3031 ICL3221E
RI
RI
Q7001
M3087BFKBGP
MAIN MICROPROCESSOR
INTERFACE
IR OUT
IR
IR IN
NAVD-9052 SD-6
NADG-9074 SD-9
12V TRIGGER
OUT ZONE 2
12V TRIGGER
CONTROL
OPTICAL IN 1
DIGITAL IN
(FRONT)
COAX IN 2
COAX IN 1
HDMI
REMOTE
SENSOR
SPEAKER TERMINALS
7 CH
POWER
AMPLIFIERS
C
SBL
HDMI
I/F
NET BOARD
NALAN-9121
SD-20 to 27
HDMI BOARD
NAHDM-9114
SD-15 to 19
FLASH MEMORY
SD RAM
I2S
DSD
FL
FR
SL
SR
+20dB
SW2
I2S
I2S
DSD
PHONO
OPTICAL IN 2
+29dB
+29dB
+29dB
+29dB
+29dB
+29dB
+29dB
ZONE2 LEFT
SBR
L
FRONT
SURR
SURR
BACK
R
SUBWOOFER
CENTER
L
R
L
R
PRE OUT
CD
DC,DD Type Only
TUNER UNIT
HD RADIO:
DC,DD Type only
AM LOOP
ANTENNA
FM
ANTENNA
SW
R
L
R
L
ZONE2 PREOUT/LINEOUT
TONE
Q4204 R2S15211FP
Audio Selector, Volume, Tone
0dB FIX
ZONE3 PREOUT/LINEOUT
ADC
-6dB
-6dB
Q3041
CS42516
MAIN B
ZONE2
ZONE3
C2
R
L
FL
FR
C
SW
SL
SR
SBL
SBR
Q4305
NJU7313A
HEADPHONES
(DVD audio,etc)
Q4306
NJU7311A
0dB
Video REC
0dB
-6dB
-6dB
Q4405
CS3318
VIDEO IN
AUX 2
AUX 1
Q4029
TC94A46CFG
Analog Switch Array
Analog Switch
Analog Switch
Analog Switch
Volume
ch13
ch12
ch11
ch10
ch9
ch8
ch2
RIAA
XM
Sirrus
MAIN A
DIR
TONE
0dB FIX
NJU7313A
ch7
ch6
ch5
Q4304
NJU7312A
NJU7312A
0dB FIX
0dB FIX
1
2
3
SETUP MIC
3
2
1
OPTICAL OUT
COAX IN 3
MUL
TI
CHANNEL
INPUT
FL
FR
C
SW
SL
SR
SBL
SBR
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
PCM1796
DAC
PCM1796
DAC
Q3701
Q3721
Q3741
Q3761
Q3781
PCM1796
DAC
PCM1796
DAC
PCM1796
DAC
TC74VHC157FT
MULTIPLEXER
.
.
.
.
DSP BLOCK
SD-10, 11
I2S/DSD
MULTIPLEXER
TC74VHC157FT
Q3001
TC74VHC157FT
<Note>
Refer to SCHEMATIC DIAGRAM-9 and -29 (SD-9 and SD-29)
for digital audio signal flow wave forms.
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
2nd DSP Q3501 TMS320D788E001BRFP266
(SD-11)
1st DSP Q3401 TMS320D790E001BZDH275
(SD-10)
3rd DSP Q3601 TMS320D707E001BRFP250
(SD-11)
TX-NR906/NA906
BLOCK DIAGRAMS-1
AUDIO SECTION
A
1
2
3
4
5
B
C
DE
FG
H
SPDIF
RX0
RX5
MCH SR
RX6
RX7
D
A
C_FL
D
A
C_SL
D
A
C_SR
D
A
C_SBR
D
A
C_SBL
V_OUT_L
V_OUT_R
D
A
C_FR
DAC FL
MIX L
MIX R
DAC FR
D
A
C_CT
D
A
C_SW
MCH C
DAC C
MCH SW
DAC SW
MCH SL
MAIN L
MAIN R
DAC SL
D
A
C
CT2
D
A
C
SW2
MCH_SBR
MCH_SBL
MCH_SR
MCH_SL
MCH_SW
MCH_CT
CENTER
SURR LEFT
SURR RIGHT
ZONE2 RIGHT
VCR/DVR OUT
TAPE OUT
SURR BACK
FRONT RIGHT
FRONT LEFT
-
FR
ONT
RIGHT(BTL)
+
-
FR
ONT
LEFT(BTL)
+
TAPE
VCR/DVR IN
CBL/SAT
GAME/TV
DVD
OUT
MAIN,SUB
IN 1-4
ch3
ch4
ch14
SURR BACK
or Bi-AMP LEFT
or Bi-AMP RIGHT
RS-232
TRANCEIVER
RS-232
Q3031 ICL3221E
RI
RI
Q7001
M3087BFKBGP
MAIN MICROPROCESSOR
INTERFACE
IR OUT
IR
IR IN
NAVD-9052 SD-6
NADG-9074 SD-9
12V TRIGGER
OUT ZONE 2
12V TRIGGER
CONTROL
OPTICAL IN 1
DIGITAL IN
(FRONT)
COAX IN 2
COAX IN 1
HDMI
REMOTE
SENSOR
SPEAKER TERMINALS
7 CH
POWER
AMPLIFIERS
C
SBL
HDMI
I/F
NET BOARD
NALAN-9121
SD-20 to 27
HDMI BOARD
NAHDM-9114
SD-15 to 19
FLASH MEMORY
SD RAM
I2S
DSD
FL
FR
SL
SR
+20dB
SW2
I2S
I2S
DSD
PHONO
OPTICAL IN 2
+29dB
+29dB
+29dB
+29dB
+29dB
+29dB
+29dB
ZONE2 LEFT
SBR
L
FRONT
SURR
SURR
BACK
R
SUBWOOFER
CENTER
L
R
L
R
PRE OUT
CD
DC,DD Type Only
TUNER UNIT
HD RADIO:
DC,DD Type only
AM LOOP
ANTENNA
FM
ANTENNA
SW
R
L
R
L
ZONE2 PREOUT/LINEOUT
TONE
Q4204 R2S15211FP
Audio Selector, Volume, Tone
0dB FIX
ZONE3 PREOUT/LINEOUT
ADC
-6dB
-6dB
Q3041
CS42516
MAIN B
ZONE2
ZONE3
C2
R
L
FL
FR
C
SW
SL
SR
SBL
SBR
Q4305
NJU7313A
HEADPHONES
(DVD audio,etc)
Q4306
NJU7311A
0dB
Video REC
0dB
-6dB
-6dB
Q4405
CS3318
VIDEO IN
AUX 2
AUX 1
Q4029
TC94A46CFG
Analog Switch Array
Analog Switch
Analog Switch
Analog Switch
Volume
ch13
ch12
ch11
ch10
ch9
ch8
ch2
RIAA
XM
Sirrus
MAIN A
DIR
TONE
0dB FIX
NJU7313A
ch7
ch6
ch5
Q4304
NJU7312A
NJU7312A
0dB FIX
0dB FIX
1
2
3
SETUP MIC
3
2
1
OPTICAL OUT
COAX IN 3
MUL
TI
CHANNEL
INPUT
FL
FR
C
SW
SL
SR
SBL
SBR
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
L
R
PCM1796
DAC
PCM1796
DAC
Q3701
Q3721
Q3741
Q3761
Q3781
PCM1796
DAC
PCM1796
DAC
PCM1796
DAC
TC74VHC157FT
MULTIPLEXER
.
.
.
.
DSP BLOCK
SD-10, 11
I2S/DSD
MULTIPLEXER
TC74VHC157FT
Q3001
TC74VHC157FT
<Note>
Refer to SCHEMATIC DIAGRAM-9 and -29 (SD-9 and SD-29)
for digital audio signal flow wave forms.
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
+6dB
VLSC
2nd DSP Q3501 TMS320D788E001BRFP266
(SD-11)
1st DSP Q3401 TMS320D790E001BZDH275
(SD-10)
3rd DSP Q3601 TMS320D707E001BRFP250
(SD-11)