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TX-NR708
Ref. No. 4213
062010
SERVICE MANUAL
AV RECEIVER
MODEL TX-NR708(B)/(S)
Black and Silver models RC-768M
B MDC, B MDF 120V AC, 60Hz
B MMP, B MMA, S MMP 220-240V AC, 50/60Hz
B MMR, B MMQ 220-240V AC, 50/60Hz
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.
TX-NR708
SERVICE PROCEDURE-1
1. Replacing the fuses
This symbol located near the fuse indicates that the
fuse used is show operating type, For continued protection against
fire hazard, replace with same type fuse, For fuse rating, refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.
REF NO. PART NAME DESCRIPTION PART NO. REMARKS
F2000 FUSE 4A-UL/T-233 252325GR
F2000 or FUSE 4A-T/UL-ST2 252257GR
F2001 FUSE 2A-UL/T-233 252320GR
F2001 or FUSE 2A-T/UL-ST2 252253GR
F6901 FUSE 15A-TUL-250V 252303GR
F6901 or FUSE 15A-UL/T-314 252197GR
F6902 FUSE 15A-TUL-250V 252303GR
F6902 or FUSE 15A-UL/T-314 252197GR
F901 FUSE 10A-UL-ST6 N1 252382GR
F901 FUSE 5A-SE-EAK 252078GR
F901 or FUSE 5A-SE-TL250V 252278GR
: 120V,Canadian model
: 230V,CE(European) country model
: 230V,Australian model
: 220/230-240V,Hong kong model
: 220/230-240V,Chinese model
2. Safety check out
(U.S.A. model only)
After correcting the original service problem, perform the following safety check before releasing the unit to the customer.
Leakage current Check
Measure the leakage current to a known earth ground (water pipe or conduct etc.) by connecting a leakage current
tester between the earth ground and exposed metal parts of the unit (input/output ground terminals, screw heads or metal overlays etc.).
Plug the power supply cord directly into a 120Vac 60Hz wall socket and turn ON/STANDBY button on.
Any current measured must not exceed 0.5mA.
3. Memory Backup
This model uses a EE-PROM IC in order to retain radio presets and other settings. So, memory contents will be
kept eternally with no care.
4. To initialize the unit
1. ON/STANDBY (Power On)
2. VCR/DVR + ON/STANDBY. ON/STANDBY VCR/DVR
Cle a r Stand-by
Preset memory and each mode stored in the memory, are
initialized and will return to the factory settings.
TX-NR708
SERVICE PROCEDURE-2
5. To check version of Microprocessor, DSP and Video FW(Firmware)
1. ON/STANDBY (Power On)
2. DISPLAY + ON/STANDBY.
[e.g.] TX-NR808
Main :
1 .03/1 0 7 2 9 A M
3. TONE [Tone ] ---> Forward [ ] : DTR-40.2/ 50.2, DHC-40.2
TONE [Tone ] ---> Reversed.
FW Version displayed
only for 3 seconds.
TONE
Ma in:
1.0 3 /10729A M Main Microprocessor
TONE TONE
DS P 1 st/NE T:
1 .06/1 0 9 2 2 A M7 1st DSP/NET (DA830)
TONE TONE
DS P 2 n d :
1.0 0 /10429aM A 2nd DSP
TONE TONE
V ideo:
1 .02/1 0 7 2 9 A S Video Microprocessor
TONE TONE
V S P (S equoia ):
1 .03/1 0 7 0 9 A MA VSP (Video Signal Processor)
TONE
4. ON/STANDBY (Power Off).
TONE LEVEL
ON/STANDBY TONE LEVEL DISPLAY
TX-NR708
A B C D E F G H
EXPLODED VIEWS-1
A715 A703
P921 x 6 pcs.
ONLY A253, ONLY
1
A279 A269 A261 A143 A137
A281 x 2 pcs. x 5 pcs. A145 x 2 pcs.
A285 A271 A245 U0013
A283
A267 A251 A029
A241
x 7 pcs. A289 U0011
A259 x 2 pcs. A701
x 7 pcs. EXCEPT
x 6 pcs. ONLY
A237A
A705
U0012
Refer to
A263 in
x 2 pcs. U0050 EXPLODED VIEWS-3
A031
2 A257 U0051 x 3 pcs.
x 10 pcs. A037
A264 U0054 F6901
A255 U007 F6902
x 12 pcs.
A181 P8002
x 5 pcs. A197
P8641 U0010 A017 x 4 pcs.
U0041 P2101 A009 U0066 A195
A273 P900
x 2 pcs. U011 A035 U0014
A032 U0064
x 5 pcs. U0015
A131 U0016
P103
A017 A001
EXCEPT
F2000
3 F2001 A027
A011
U0052 A247 A021
P906 A179
A129 x 4 pcs. x 2 pcs. A183
EXCEPT
A193 A025
A129 A143 x 2 pcs. A183
x 2 pcs.
T901 A144 A019
U0040
A023 A013
A127 A119 x 2 pcs.
A191 x 3 pcs. P640
A015
U0030 A117 x 4 pcs.
x 3 pcs.
A127
4
U0032 A133
A125 A113 Refer to
F901E F901 A183 in
EXPLODED VIEWS-2
A141
A081
P9008 U0031 A095
U0033 A135 x 4 pcs.
5 A101
x 4 pcs.
A185 A123
x 5 pcs. U0063 A097
A395 x 4 pcs.
A121 A397
x 9 pcs.
TX-NR708
EXPLODED VIEWS-2
P7501
A317
x 2 pcs.
A317 U0065
A321 x 18 pcs.
A327
A323 P3101
U0060
A307
A301
A305
U0062
A325 U0055
x 3 pcs. A702 A313
A317
x 5 pcs.
U0061 A351
A303
A317 A315
x 2 pcs.
A373
U0067
A371
U0080
A309
A393 A355
x 5 pcs. A353
TX-NR708
A391
x 3 pcs.
TX-NR708
EXPLODED VIEWS-3
Q6050A
A007
x 14 pcs.
Q6056
Q6066
Q6054
Q6064
Q6051
Q6061
Q6052
Q6062
Q6050
Q6060
Q6053
Q6063 Q6050B
Q6055
Q6065
TX-NR708
TX-NR708/808/1008, TX-NA708/808/1008, HT-RC270, DTR-40.2/50.2, DHC-40.2
A B C D E F G H I J K
SCHEMATIC DIAGRAMS - 1
BLOCK DIAGRAM AUDIO SECTION
except onk JJ HEADPHONES
1 TUNER UNIVERSAL
PACK PORT
POWER AMPLIFIER
Z3L MAINR
L 83 L
Z3R 1 SPEAKER TERMINALS
2 22 SL FL
TONE +29dB
R 82 R 23 SL
FRONT LEFT
for US SIRIUS_L 24
57 L Down mix : No use
SIRIUS SIRIUS SIRIUS_R
R2A15220FP MAINL
1
Tone : Use for Z3
FR
+29dB
56 R
2 20 SR
TONE
SPRLF FRONT RIGHT
19 SR
60 L MAINL
L
AUDIO IN 18
SL(DAC) 43 SL(DAC) C
(FRONT) R 61 R MAINR 43 +29dB
2 91
91
MCH SL
1
2
16 C
SPRLC CENTER
65 L L
L ADCL
53
SR(DAC) 42 SR(DAC)
PHONO (MM) Z3 17
64 R R SL/Z3L
R 54
708:Z2 mirror
90 MCH SR
+29dB
SURR
90 15
L
PHONO EQ 67 L
ADCR
0/-6/-12/-18dB
1
LEFT
39 C(DAC) 2 Ref. GND
TUNER 14 SW
( for onk JJ ) R 66 R 93 MCH C
SR/Z3R
+29dB
SURR
38 SW(DAC) 13
69 L SPRLSR
L
+
L
SUB1L
46
1
RIGHT
MAIN
SRC
TV/CD IN 92 MCH SW
2
68 R
R R 47
10
SBL/Z2L/Bi_L/LH
34
34
FL(DAC)
11
FL +29dB SUR. BACK
L 71 L
SUB1R
-6dB
/ Bi Amp
95 FL(MIX)
3 PC IN
2 12 LEFT
R 70 R inverted down mix
41 FL
SLC
1
priority terminal
41
SBR/Z2R/Bi_R/RH
8
+29dB SUR. BACK
L 73 L 40 FR
7
FR
SPRLSB
/ Bi Amp
GAME IN inverted down mix RIGHT
94 FR(MIX)
72 R
R -6dB
Z2L SBRC 6