SERVICE MANUALRef. No. 3677
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.
052001
A-905TX
INTEGRATED STEREO AMPLIFIER
A-905TX
UDT 120V AC, 60HzUPT 230-240V AC, 50Hz
STANDBY/ON
PHONES
STANDBY
A-905TX
INTEGRATED STEREO AMPLIFIER
TREBLEBASS BALANCE
POWER
OFF/1/2— + — + L R
PRESENCEACOUSTIC
CD MD TUNER
LINE/DVD
TAPE
CDR/PC
SOURCE DIRECTDIRECT
DIRECT
TONE
INPUT
ON OFF
VOLUME WIDE RANGE AMP TECHNOLOGY
CLOCK SLEEP EFFECTGRAPHIC EQ
MODE
1 2 3
4 5 6
7 8 9
10 / 0- - / - - -
VOLUME
PRESET
F M A M
PLAY MODE
PLAY MODE
REPEAT
CLEAR
SCROLL
MEMORY
REPEAT
CLEAR
DISC
REPEAT
CLEAR
ACOUSTICPRESENCE
TONE
RANDOM
TIMER
UP/DOWN
ENTER
MUTING
INPUTTUNER
M D
DVD
C D
CDR
TAPE
REC
REC
PAUSE / STEP
STANDBY/ ON
REMOTE CONTROLLER RC -456S
A-905TX
SPECIFICATIONSPART-XX
SERVICE PROCEDURESPART-XXReplacing the fuses
REF.NO. PART NO. DESCRIPTION This symbol located near the fuse indicates that thefuse used is show operating type, For continued protection againstfire hazard, replace with same type fuse , For fuse rating, refer to the marking adjest 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.
F901 252158 1.6A-UL/T-237, Fuse <DT>252069 0.8A-SE-EAK, Fuse <PT>
F902-F904 2.5A-SE-EAK, Fuse <PT>252075
NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V
A-905TX
CHASSIS EXPLODED VIEW############
A51
A65
A66A11
A10
A10
A11
A10A61
A64
A63A52
A58
A50
A67
U9
A1
A13
A55A53A54
A56
A73
A73
A16
U4
F901
A43
A43
A25
A26
E860
A34
A34
T901
Q523Q525
Q526
Q524
Q528
Q527
A28
A10
P701
A10
A10
A10
U3
U2
P402
P402
A46
A49
A49
A49
A49
U7
U1
U8
U5
A41
A27
A27
P801
A81
A40
A11A11
A11
P901
P584A
U10
F903F904F902
A47
A-905TX
CHASSIS EXPLODED VIEW PARTS LIST############
REF NO. PART NO. DESCRIPTION REF NO. PART NO. DESCRIPTION
A1 27111123 Front bracket P402 27190011 KGLS-6S, HolderA10 838130088 3TTB+8B, Self tapping screw P584A 880009 Plastic rivet, NRP-345 <PT>A11 838430088 3TTB+8B(BC), Self tapping screw P701 27191106 UAMS-05S-2, HolderA13 28198862 Facet, VOL P801 25055436 or NPLG-2P418, Shorted plugA16 27100375D Chassis 25055945A25 27160451B
27160452BA26 29110083 Adhesive tape, CROSS-16U Q523,Q524 2202303 or * 2SC4512-O orA27 801525 3TTB+8B(BC), Special screw <PT> 2202304 or * 2SC4512-Y or
838430088 3TTB+8B(BC), Self tapping screw <DT> 2202305 * 2SC4512-P, TransistorA28 801433 3SMS8W.SW+14B(BC), special screw Q525,Q526 2202313 or * 2SA1726-O orA34 27141530A Retainer, HS-2 2202314 or * 2SA1726-Y orA40 27300750 Bussing cord 2202315 * 2SA1726-P, TransistorA41 27122831 Rear panel <DT> Q527,Q528 2212654 or * 2SC3421-Y or
27122832 Rear panel <PT> 2212653 * 2SC3421-O, TransistorA43 830440089 4TTC+8C(BC), Self tapping screwA46 28184759-1A47 29362571 Label, WARNING <DT,PT>
2301423 NPT-1374D, Power transformer <DT>
A49 838930088
Heat sink <DT> P901 253277MIL AS-UC-2#18, Power supply cord <DT>Heat sink <PT> 253193HIT AS-CEE, Power supply cord <PT>
Top coverT901
3TTB+8B(UN), Self tapping screw
2301424 NPT-1374P, Power transformer <PT>
A50 838430107 3TTB+10S(BC), Self tapping screw
U1 1A905530-4B NADG-6630-4B, Main circuit PC board ass'y <DT>
A51 27212298 Front panel
1A905530-4C NADG-6630-4C, Main circuit PC board ass'y <PT>
A52 28198894 Facet 7P
U2 1A905531-4B NAAF-6631-4B, Preamplifier circuit PC board ass'y <DT>
A53 28198895 Facet 1P
1A905531-4C NAAF-6631-4C, Preamplifier circuit PC board ass'y <PT>
A54 28198925 Facet A
U3 1A905532-4B NAAF-6632-4B, Acoustic circuit PC board ass'y <DT>
A55 27268037 Guide A
1A905532-4C NAAF-6632-4C, Acoustic circuit PC board ass'y <PT>
A56 28325133 Knob, FM
U4 1A905533-4B NAPS-6633-4B, Power supply circuit PC board ass'y <DT>
A58 28191798 Clear plate, RE
1A905533-4C NAPS-6633-4C, Power supply circuit PC board ass'y <PT>
A61 28325926 Knob, INPUT
U5 1A905534-4B NADIS-6634-4B, Display circuit PC board ass'y <DT>
A63 28135247Y Badge
1A905534-4C NADIS-6634-4C, Display circuit PC board ass'y <PT>
A64 28325925 Knob, VOL
U7 1A905536-4B NAETC-6636-4B, Speaker terminal PC board ass'y <DT>
A65 28325674 Knob, TD
1A905536-4C NAETC-6636-4C, Speaker terminal PC board ass'y <PT>
A66 28325927 Knob, TONE
U8 1A905537-4B NAETC-6637-4B, Terminal PC board ass'y <DT>
A67 28325673 Knob, POWER
1A905537-4C NAETC-6637-4C, Terminal PC board ass'y <PT>
A73 27175323 Leg AS
U9 1A905539-4B NAETC-6639-4B, Power switch PC board ass'y <DT>
A81 29362630 Label, PROCESSOR
1A905539-4C NAETC-6639-4C, Power switch PC board ass'y <PT>
F901 252158 1.6A-UL/T-237, Fuse <DT>
U10 1A905540-4C NAETC-6640-4C, Fuse PC board ass'y <PT>
252069 0.8A-SE-EAK FSBFUSE, Fuse <PT>F902-F904 2.5A-SE-EAK FUSE <PT>
NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230VNOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.
CAUTON : Replacement of the transistor of mark * ,if necessary, must be made from the same beta group(HFE) as the original type.
252075
SCHEMATIC DIAGRAM-1
U7
U9
U4U10
U1
U8
SPEAKER TERMINAL PC BOARD
A-905TX
POWER SWITCH PC BOARD
POWER SUPPLY CIRCUIT PC BOARD
FUSE PC BOARD
MAIN CIRCUIT PC BOARD
TERMINAL PC BOARD
-1.2
1.2
5.6
12.2
-12.2
12.411.8
-24.6
24.6
-1.2
1.2
-24.1-24.6
24.624.1
-24.1-24.6
24.624.1
E LENT. POUR UNE PROTECTION PERMANENTE,N'UTILISERCE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST
INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST
RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL
FOR CONTINUED PROTECTION AGAINST FIREHAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE
THIS SYMBOL LOCATED NEAR THE FUSE INDICATESTHAT THE FUSE USED IS SLOW OPERATING TYPE
ATTENTION
VA
ET CALIBRATION COMME INDIQUE.
D'INCENDIE, REMPLACER UNIQUEMENTPERMANENTE CONTRE LES RISQUESAFIN D'ASSURER UNE PROTECTION
PAR UN FUSIBLE DE MEME TYPE
VA
AGAINST FIRE HAZARD, REPLACEFOR CONTINUED PROTECTION
AND RATING INDICATED.ONLY WITH FUSE OF SAME TYPE
CAUTION
P91
0
P307
D914-D917GP104003E
+
JL70
2B
S951
S951
S951
P91
0P
910
*C312221K
*C311
221K
*C308101K
*C307
101K
*C304101K
*C303
101K
*C302101K
*C301
101K
*C320101K
*C319101K
*C316
101K
C315101K
*C314
101K
*C313101K
C712104J
P951P952
P90
2AP
911A
P91
2A
P951P952
P951P952
P91
1AP
912A
P951P952
P90
2A
P951P952
P91
2CP
911C
P91
1AP
912A
P91
4AP
913A
P951P952
P90
2A
P91
1BP
902B
P91
2B
P58
6BP
585B
P58
6AP
585A
P501AP401A
Q713M51943B
G IO
Q91178M56
G IO
R576500B
R575500B
R713 100K*7
R712100K*4
JL90
1AJL
901A
JL90
1A
JL58
2BP
461B
JL90
1B
P405C
P502AP403A
JL70
1B
Q704DTA124ES
Q451DTA114ES
Q70
2T
A72
91S
123456789
X701CST4.00MGW
D912
MTZJ12C
D913
MTZJ12C
D745
MTZJ5.1B
D705MTZJ5.6B
D707MTZJ5.1B
Q714
DTC144ES
Q912DTC123JS
Q703DTC144ES
RL901
RL901
D918
GP104003E
D706
D919
D702
D701
D704
D708
D722
D703
D911RBV402
D3SBA30
P901
P901
P901
AC230-240V/50HZ
P90
1AP
901A
P90
1A
F90
11.
6A/1
25V
F90
11.
6A/1
25V
F90
2
T2A
L250
V
F904
T2.5AL250V
F903T2.5AL250V
F90
1
Q701HD404316-E30H
27282930
34353944
905/90910
AV
CC
15
AVSS6
CE
43
CLK
40
DA
TA
42D
IRE
CT
14
GND5
HP
-IN
13
INPMUTE 26KEYIN9
LAT
41
MU
TE
LED
20
NC
22
PO
FF
17 21
POWER2 25
PR
OT
EC
T36
RE
MIN
18
RESET2
RII
N12
R IOUT11
SBASS1 31SBASS2 32SBASS3 33
SB
AS
SLE
DA
37S
BA
SS
LED
B38
SELIN17SELIN28
SP
-RE
LAY
19
TEST1
VC
C16
VOLDOWN24VOLUP 23
X13X24
L506
L502
L504
L501
L505
L503
JL58
1C
JL58
1A
P405B
P582
P584
R5620.22*2
(2W)
R5610.22*2
(2W)
C917330/16
C916330/16
C92210/16
C91947/16
C51610/16
C51510/16
C703100/6.3
C701
0.1/5.5
C9143300/35
C9153300/35
C9202200/16
C7082.2/50
C32210/16
C32110/16
C4512.2/50
C4522.2/50
C7111/50
Q5332SA992
Q7062SA933S-R
Q5262SA1726Q518
2SA992
Q5202SA965
Q525 2SA1726
Q5172SA992
Q5192SA965
Q5302SC1740S
Q5282SC3421
Q5272SC3421
Q5292SC1740S
Q7052SC1740S-R
Q5322SC1845
Q5222SC2235
Q5242SC4512
Q5162SC1845
Q5312SC1845
Q5232SC4512
Q5212SC2235
Q5152SC1845
P311A
P306
C9510.01
C9510.01
C30
9
101
C582471
C581 471
C9510.01
C921223Z
C918103J
C923223Z
C913104J
C912104J
C517473
C704
223Z
C707223Z
C533223Z
C702
474
C518473
C532223Z
C710
223Z
C709
223Z
C531223Z
R9160.47(1/2W)
R9160.47
(1/2W)
R5542.2 (1/2W)
R5522.2
(1/2W)
R5512.2(1/2W)
R353
1M
R9160.47
(1/2W)
R543100
(1/2W)
R55015
(1/2W)
R58210K
R581680
R55682
(1/2W)
R55582
(1/2W)
R351
2.2K
R3541M
R352
2.2K
R308
1M
R307
1M
R306
330
R305
330
R304
1M
R303
1M
R302
330
R301
330
R316
1M
R315
1M
R314
330
R313
330
R312
1M
R311
1M
R310
2.2K
R309
2.2K
R324
1M
R323
1M
R322
330
R321
330
R320
1M
R319
1M
R318
2.2K
R317
2.2K
R572220
R5681.8K
R5701.2K
R574220
R571220
R5671.8K
R5691.2K
R573220
R59310
(1/2W)
R59510
(1/2W)
R328
1M
R332
1M
R331
1M
R327
1M
R330
330
R326
330
R329
330
R325
330
R56010
(1/2W)
R6011K
R58310K
R5658.2
(1/2W)
R745
1K
R738
3.3K
R718100KR719100K
R74010K
R73922K
R61010K
R70522K
R914
270(1/2W)
R915
220(1/2W)
R913
220(1/2W)
R912
270(1/2W)
R917
10(1/2W)
R7082.2K
R7091K
R707220K
R70647K
R4712.2K
R472220K
R336
1M
R335
1M
R334
2.2K
R333
2.2K
R340
1M
R339
1M
R338
330
R337
330
R714
68K
R716
12K
R71568KR717
22K
R59610(1/2W)
R60810K
R56
68.
2
(1/2
W)
R6021K
R606
820
R604680
R5644.7
(1/2W)
R546100(1/2W)
R55810
(1/2W)
R548
15(1/2W)
R544100(1/2W)
R594 10 (1/2W)
R742100K
R736100K
R701 1M
R7103.3K
R711 4.7K
R7351KR7341K
R7331K
R605820
R60710K
R603680
R5634.7
(1/2W)
R5532.2 (1/2W)
R55910 (1/2W)R549
15(1/2W)
R545100
(1/2W)
R547
15(1/2W)
R55710 (1/2W)
P305
P301
P302
P303
P304
Q301TC9273N-010
10
11
12 17
18
19
20
21
22
23
24
25
26
27
CD3
CDR-P2
CK 15
DATA16GND13
L/DVD5
MD-P7
MD-R6
ST14
T-P9
T-R8
TU4
VDD 28VEE1
UJJ
NAETC-6639
NAPS-6633
NPT-1374J
/60HzAC100V/50Hz
T901
UDT
NAETC-6639
AC120V/60Hz
NAPS-6633
NPT-1374DT901
+B5
-B2
+B2
+B4+B3
-B1
+B1
NAETC-6640
UPT
T80
0mA
L250
V
R
L
SPEAKERS
CDR/PC
NAETC-6636
D918
Acoust ic Presence AMP&VR
UPT
UJJ,UDT
NAETC-6639
ONE TIME ONLY
R742R712,R713,R718,R719
USE
NO USE
PARTSNUMBER
C301-C304,C307,C308C311-C316,C319,C320C581,C582
NPT-1374P
NAPS-6633
T901
TO
NA
DIS
-663
4T
O N
AD
IS-6
634
TO
NA
DIS
-663
4T
O N
AD
IS-6
634
TO NAAF-6631TO NAAF-6631
TO NAAF-6632TO NAAF-6632
TO NAAF-6631
NAETC-6637
NADG-6630
LINE/DVD
TUNER
MD
REC
REC
PLAY
PLAY
RIGHT
LEFT
RIGHT
LEFT
RIGHT
LEFT
CD
LEFT
LEFT
RIGHT
RIGHT
LEFT
RIGHT
RIGHT
LEFT
IN
OUT
PROCESSOR
*
+B
1
+B
1
MU
TIN
G
S.B
AS
S1
S.B
AS
S2
S.B
AS
S3
PO
WE
R2
RL E NF
-R
NF
-L
PO
WE
R2 EE LL R R
EEE RRLL+
B2
-B2
*
*
-B1
+B1
HP-IN
DIRECT
KEYINMUTELED+5.6V
EREMIN
LED ALED B+5.6V
ESELIN2
SELIN1CLK
LATDATA
LchERch
SUBWOOFER PREOUT
L-OUT
R-OUTE
*
RI
P311B
P311B
TAPE
RIGHT
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
LEFT
PLAY
REC
*
E-B1
-B1
BY MARK ARE CRITICAL FOR SAFETYIDENTIFIED
NOTE
THE COMPONENTS
REPLACE ONLY WITH PART NUMBER SPECIFIED.
.
. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
. ALL PNP TRANSISTORS ARE EQUIVALENT
. ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
. ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
. ELECTROLYTIC CAPACITORS ( ) ARE IN F/WV.
. ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030 3pF 330 33pF 331 330pF
u
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.. THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT..
.
TO 2SA1015-GR UNLESS OTHERWISE NOTED.
333 0.033uF
A
1
2
3
4
5
B C D E F G
A-905TX
SCHEMATIC DIAGRAM-2
U3
U2PREAMPLIFIER CIRCUIT PC BOARD
ACOUSTIC CIRCUIT PC BOARD
U5 DISPLAY CIRCUIT PC BOARD
-19.1
-23.4
-24.0
-23.4
-13.0
-6.9
-13.0
-6.9
-19.1 -19.7
-0.7
24.123.5
22.923.5
24.123.5
22.923.5
-0.7
-24.0-19.7
S401(1/2)
S401(2/2)
P401B
P501B
JL702A
P405A
D503
MTZJ5.6B
D504MTZJ5.6B
JL50
1A
JL50
1B
C420
104
C416
393
C424
153
C423
153
C415
393
C417474
C419
104
C418474
C410
104
C409
104
Q4142SK246
Q4132SK246
Q4092SK246
Q407
2SK246
Q410
2SK246
Q408
2SK246Q4062SK246
Q4052SK246 Q411
2SK246
Q4122SK246
Q402
NJM2068L-D
Q403
NJM2068L-D
Q402
NJM2068L-D
Q403
NJM2068L-D
Q404
NJM2068D-D
Q404
NJM2068D-D
Q401
NJM4565D-D
Q401
NJM4565D-D
S70
2
S70
1
P403B
P502B
JL701A
P583
Q711
DTA114ES
Q712DTA114ES
D720SPR-39MVW
Q418
RN1241
Q416
RN1241
Q417
RN1241
Q415
RN1241
Q708
DTC114ES
Q710
DTC124ES
Q709
DTC124ES
JL582A P461A
R458R458
R461250KW
U701REMSENS
D402
D502
D501
D746
D410
D409
D403
D405
D404
D406
D401
D408
D40
7
D710
D709
D72
1
SLR
-332
VR
D71
1S
LR-3
32V
R
D72
3
SE
L2E
10C
D71
6
SLR
-332
DU
D71
4
SLR
-332
DU
D71
7
SLR
-332
DU
D71
5
SLR
-332
DU
D71
3
SLR
-332
DU
D71
2
SLR
-332
DU
Q707 74HC595
D14
LC12
OE
13
QA
15
QB
1
QC
2
QD
3
QE
4
QF
5
QG
6
QH
7R
ES
10
SC
11
SQ
H9
VD
D16
VS
S8
R437(2/2)
100KW
R437(1/2)
100KW
R438(2/2)
100KW
R438(1/2)100KW
C509220/6.3
C71810/16
C519
100/50
C520
100/50
C502
22/50
C52
2
100/
50
C746
100/6.3
C71510/16
C71410/16
C514
10/50
C513
10/50
C51210/16
C521100/50
C501
22/50
C51110/16
C426
10/16
C425
10/16
C4122.2/50
C411
2.2/50
C42910/16
C43010/16
C407
47/50
C40847/50
C510220/6.3
C404
47/50
C403
47/50
C71710/16
Q5092SA992
Q5072SA992
Q511
2SA992
Q5082SA992
Q5102SA992
Q51
2
2SA
992
Q5052SC1740S
Q5012SC1845
Q503
2SC1845
Q5132SC1845
Q5022SC1845
Q5062SC1740S
Q5042SC1845
Q5142SC1845
C722
103Z
C5082P
C723
103Z
C503101
C504101
C724
223Z
C713223Z
C721
103Z
C5072P
C505101J
C421822
C422822
C427
153
C428
153C414
224
C413
224
C506
101J
C406
102J
C405
102J
C716223Z
R579820
R5133.3K
R5143.3K
R53382
(1/4W)
R5291.2K
(1/2W)
R522
22K
R521
22K
R731
100K
R730
100K
R50256K
R525820
(1/2W)
R5981.2K(1/2W)
R5971.2K
(1/2W)
R450
100K
R4461M
R46010K
R45910K
R721
10K
R74610K
R744560
R741
100K
R50
4 1K
R503
1K
R590
33
R58933
R57856K
R520100K
R457100K
R456100K
R455100K
R743
100K
R727330
R726390
R57756K
R517
470
R527820
(1/2W)
R523820
(1/2W)
R501
56K
R519100K
R515
2.7K
R509330
R505
1.8K
R5071.8K
R511330
R53718K
R53518K
R53182(1/4W)
R453220K
R4511K
R454220K
R4521K
R518
470
R528820
(1/2W)
R442
1K
R44
0
1M
R441
1K
R43
9
1M
R434
680
R4271.8K R425
1M
R4234.7K
R421220K
R433
680
R4291M
R435100K
R431
1M
R426
1M
R4281.8K
R422220K
R4244.7K
R430 1M
R436100K
R432
1M
R4141M
R4131M
R449100K
R445
1MR4151M
R419
180K
R447
1.2K
R4431M
R448
1.2K
R4441M
R4161M
R418
680
R420180K
R417
680
R580820
R530
1.2K
(1/2W)
R526
820
(1/2W)
R524820
(1/2W)
R516
2.7K
R5061.8K
R510330
R512330
R5081.8K
R53818K
R53618K
R53282
(1/4W)
R534
82(1/4W)
R4124.7K
R410220K
R4083.3K
R4063.3K
R4114.7K
R409220K
R4073.3K
R4053.3K
R402330
R401
330
R729
3.3K
R7283.3K
R724150
R403100K
R404100K
R585180
R586180
R587
180
R588
180
R723
560
R722
270
TONE
DIRECTSOURCE DIRECT
INPUT SELECTOR
RED GRN2
31
L-2(CDR)
L-1/DVD
TO NADG-6630TO NADG-6630
TO NADG-6630TO NADG-6630 TO NADG-6630 TO NADG-6630
TO NADG-6630
TO
NA
AF
-663
2
TO
NA
DIS
-663
4
TO NADG-6630
TO NADG-6630
NADIS-6634
NAETC-6635
NAAF-6631
NAAF-6632
DIR
EC
T
PO
WE
R2
MU
TE
PHONES
TD
RN
RO
RB
E
LB
LO
LN
TD
RN
RB
E
LB
LO
LN
RO
+B
2
-B2
SB
AS
S1
PO
WE
R2
RERLL
EEE NF
-E
NF
-E
R ER L L
LR NF
-L
NF
-R
ST-BY TAPEMDCD TUNER
HP
-IN
VOLUME
SB
AS
S3
SB
AS
S2
INP
MU
TE
-B +B E -B+BEEE
RE
MIN
E
+5.
6V
MU
TE
LED
KE
YIN
(2 /2)
(1/2)(2/2)
(2/2)
(2/2)
(1/2)(1/2)
Tone bass
R-I
N
L-IN
TREBLEBASS
(1/2)
AC
OS
TIC
PR
ES
EC
E
DA
TA
LAT
CLK
SE
LIN
1
SE
LIN
2
E +5.
6V
LED
B
LED
A
E
LchER
ch
BALANCE
ACOUSTIC PRESENCE
R732
PO
WE
R
VOL_IND
A
1
2
3
4
5
B C D E F G
A-905TX
PC BOARD CONNECTION DIAGRAMXXXXX
NAETC-6636
NAPS-6633
NAETC-6640
NAPS-6633
NADG-6630
NADG-6630
NADIS-6634
NAETC-6637
NAAF-6631
NAAF-6632
230V model only
NAETC-6639
AC IN
AC OUTLET
P584 P585B
P585A
P586B
P586A
JL581C
P910
P952B
P952B
P901
P951A
P951B
P954A
P954B
P912A
P902A P902B
P911A
T901
JL901A
JL582A
JL582B
J05B
J05A
J04B
J04A
J03B
J03A
JL702A
JL702B
JL701B
JL701A
JL461AP461A
P791A
JL501B
P912CP911C
P912AP911A
P913A
P914AP914B
P913B
P311B
P306 P305
REMOTECONTROL
LINE/DVDTUNER
TAPEPLAY REC
SUBWOOFERPRE OUT
MDPLAY REC
CDR/PCCD REC PLAY
PROCESSORIN OUT
P304P582 P303 P302 P301P351A
P351B
P311A
JL581A
P591A
P591B
P912B
P911B
P592A
P592B
JL901B
P307
P502B
P502A
P501BP501A
P403A
P401B
P403B
P405A
P405C
P461B
P401A
P405B
SPEAKERSR L
SPEARKERTERMINALPC BOARD
POWER SUPPLYPC BOARD
MAIN CIRCUITPC BOARD
DISPLAY CIRCUITPC BOARD
TERMINALPC BOARD
PREAMPLIFIERCIRCUITPC BOARD
ACOUSTICCIRCUITPC BOARD
POWER SWITCHPC BOARD
U10
U2
U3
U1
U7
U4
FUSE PC BOARD
POWER SUPPLYPC BOARD
U4
U9
U5
U8
MAIN CIRCUITPC BOARD
U1
A-905TX
PRINTED CIRCUIT BOARD PARTS LIST-1
MAIN CIRCUIT PC BOARD (NADG-6630-4B/C)CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION
ICs
Rotary encoder
Q301 22240881 TC9273N-010
R732 25065534 REB161PVB
Q701 22241481 HD404316E30H
Relay
Q702 22240239 TA7291S
RL901 25065597 NRL-2P8A-DC12-147
Q713 222951 M51943B
Jacks
Q911 222780565JRC NJM78M56FA
P582 25045302 NPJ-1PDBL161
Transistors
P301-P303 25045303 NPJ-4PDBL162
Q405,Q406 2211945 2SK246-GR
P307 25045307 NPJ-2PDBL166
Q451 2213510 or DTA114ES or
Sockets
2215770 KRA102M
JL581A 25051088 NSCT-4P875
Q515,Q516 2211733 or 2SC1845-E or
JL582B 25055624 NPLG-3P586
2211732 2SC1845-F
JL701B 25055630 NPLG-9P592
Q517,Q518,Q533 2211792 or 2SA992-F or
JL702B 25055628 NPLG-7P590
2211793 2SA992-E
JL901A,JL901B 25051107 NSCT-3P894
Q519,Q520 2211643 or 2SA965-O or
P311A 25055709 NPLG-13P665
2211644 2SA965-Y
P351 2009990230 NSAS-6P0333
Q521,Q522 2211653 or 2SC2235-O or
P401A 25055706 NPLG-10P662
2211654 2SC2235-Y
P403A,P502A 25055702 NPLG-6P658
Q529,Q530,Q705 2213284 2SC1740S-R
P405 2009990565UL NSAS-14P0758
Q531,Q532 2211733 or 2SC1845-E or
P461B 25055133 NPLG-3P117
2211732 2SC1845-F
P501A 25055808 NPLG-19P764
Q703,Q714 221282 or DTC144ES or
P503,P504 25055038 NPLG-2P29
2215820 KRC104M
Retainer
Q704 2212600 or DTA124ES or
E851 27141749 (BUS)
2215780 KRA103MQ706 2213354 2SA933S-RQ912 2213640 DTC123JS
DiodesD701,D703,D704 223163 or 1SS133 or
PREAMPLIFIER CIRCUIT PC BOARD (NAAF-6631-4B/C)
223205 1SS270A
Transistors
D702,D914-D918 22380035 or GP104003E or
Q501-Q504 or 2211732 or 2SC1845-F or
22380046 AM01Z
2211733 2SC1845-E
D705 224470562 MTZJ5.6B
Q505,Q506 2213284 2SC1740S-R
D706,D708 223163 or 1SS133 or
Q507-Q512 or 2211792 or 2SA992-F or
223205 1SS270A
2211793 2SA992-E
D707,D745 224470512 MTZJ5.1B
Q513,Q514 or 2211732 or 2SC1845-F or
D722,D919 223163 or 1SS133 or
2211733 2SC1845-E
223205 1SS270A
Diodes
D911 22380022F or RBV402 or
D501,D502 223163 or 1SS133 or
22380271F D3SBA20
223205 1SS270A
D912,D913 224471203 MTZJ12C
D503,D504 224470562 MTZJ5.6B
Oscillator
Capacitors
X701 3010150 CST4.00MGW
C511,C512 354741009 10uF, 16V, Elect.
Coils
C509,C510 393322217 220uF, 6.3V, Elect.
L503-L506 5597-45502 FR core
C513,C514 393381007 10uF, 50V, Elect.
Capacitors
C519-C522 393381017 100uF, 50V, Elect.
C301-C304 374721015 100pF+/-10%, 50V, Plastic
C501,C502 393382207 22uF, 50V, Elect.
C307,C308 374721015 100pF+/-10%, 50V, Plastic
Resistors
C311,C312 374722215 220pF+/-10%, 50V, Plastic
R529,R530 443521224 1.2kohm +/-5%, 1/2W, Metal oxide
C321,C322,C922 393341007 10uF, 16V, Elect.
R597,R598 443521224 1.2kohm +/-5%, 1/2W, Metal oxide
C407,C408 393384707 47uF, 50V, Elect.
R523-R528 443528214 820ohm +/-5%, 1/2W, Metal oxide
C451,C452 353780229 2.2uF, 50V, Elect.
R531-R534 415428203 82ohm +/-5%, 1/4W, Carbon
C503,C504 374721015 100pF+/-10%, 50V, Plastic
R458 5104383 +N16RGL100KBT20F, Volume
C515,C516 393381007 10uF, 50V, Elect.
Sockets
C517,C518 374724734 0.047uF+/-5%, 50V, Plastic
P502B 25051231 NSCT-6P1021
C701 3000078 or DX-5R5L104 or
P501B 25051530 NSCT-19P1317
3000076 EECS5R5T104, Super capacitor
P405A 25055137 NPLG-7P121
C702 375524744 MMT50V-474JC703 354721019 100uF, 6.3V, Elect.C708 354780229 2.2uF, 50V, Elect.C711 354780109 1uF, 50V, Elect.C712,C912,C913 374721044 0.1uF+/-5%, 50V, PlasticC914,C915 3504317 3300uF, 35V, Elect.C916,C917 354743319 330uF, 16V, Elect.C918 374721034 0.01uF+/-5%, 50V, PlasticC919 354744709 47uF, 16V, Elect.C920 354742229S 2200uF, 16V, Elect.L501,L502 231176S S-1.3C
R543-R546 443521014 100ohm +/-5%, 1/2W, Metal oxideR547-R550 443521504 15ohm +/-5%, 1/2W, Metal oxideR551-R554 453530224 2.2ohm +/-5%, 1/2W, Metal oxideR555,R556 443528204 82ohm +/-5%, 1/2W, Metal oxideR557-R560 443521004 10ohm +/-5%, 1/2W, Metal oxideR561,R562 4500027 MPC708-2WK-0.22
R563,R564 453530474 4.7ohm +/-5%, 1/2W, Metal oxideR565,R566 453530824 8.2ohm +/-5%, 1/2W, Metal oxideR575,R576 5210257 N06HR500BC, TrimmingR593-R596,R917 443521004 10ohm +/-5%, 1/2W, Metal oxideR912-R915 443522714 270ohm +/-5%, 1/2W, Metal oxide
U1
U2
NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V
NOTE: THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.
Resistors
A-905TX
PRINTED CIRCUIT BOARD PARTS LIST-2
CIRCUIT NO. PART NO. DESCRIPTION CIRCUIT NO. PART NO. DESCRIPTION
Capacitors
Holders
C405,C406 374721024 1000pF+/-5%, 50V, Plastic
JL582A 25051087 NSCT-3P874
C409,C410 374721044 0.1uF+/-5%, 50V, Plastic
JL702A 25051091 NSCT-7P878
C419,C420 374721044 0.1uF+/-5%, 50V, Plastic
JL501A 25051092 NSCT-8P879
C427,C428 374721534 0.015uF+/-5%, 50V, Plastic
JL701A 25051093 NSCT-9P880
C413,C414 374722244 0.22uF+/-5%, 50V, PlasticC415,C416 374723934 0.039uF+/-5%, 50V, Plastic
D723A 27191018A (LED)
C417,C418 374724744 0.47uF+/-5%, 50V, PlasticC421,C422 374728224 8200pF+/-5%, 50V, Plastic
SPEAKER TERMINAL PC BOARD(NAETC-6636-4B/4C)
C425,C426 393341007 10uF, 16V, Elect.
CIRCUIT NO. PART NO. DESCRIPTION
C429,C430 393341007 10uF, 16V, Elect.
Terminal
C411,C412 393380227 2.2uF, 50V, Elect.
P584 25060193 NTM-4PDMN115, Speakers
C403,C404 393384707 47uF, 50V, Elect.
Wire holder
Sockets
JL581C 25051088 NSCT-4P875
P403B 25051231 NSCT-6P1021P401B 25051235 NSCT-10P1025JL501B 25055629 NPLG-8P591
TERMINAL PC BOARD (NAETC-6639-4B/4C)CIRCUIT NO. PART NO. DESCRIPTION
POWER SUPPLY PC BOARD (NAPS-6633-4B/4C)
Capacitors
CIRCUIT NO. PART NO. DESCRIPTION
C313-C316 374721015 100pF±10%, 50V, Plastic
Resistors
C319,C320 374721015 100pF±10%, 50V, Plastic
R916 453534794 0.47ohm ±5%, 1/2W, Metal oxide
Jacks
Socket
P304,P305 25045303 NPJ-4PDBL162
P910 25051637 NSCT-2P1424, AC Outlet <PT>
P306 25045330 NPJ-2PDBL184
25051990 NSCT-2P1777, Ac Outlet <DT>
Socket
Plug
P311B 25051238 NSCT-13P1028
P901A 25055676 NPLG-2P632Fuse holder
F901 25050065 YSH403T <JJ>
POWER SWITCH PC BOARD (NAETC-6639-4B/4C)
F902 25050065 YSH403T <PT>
CIRCUIT NO. PART NO. DESCRIPTION
Fuse label
Capacitors
F901C 29362519 T800mAL250V <PT>
C951 3300055 DE1610F103M-KHSwitch
S951 25035550 NPS-111-L512P, PowerCover
DISPLAY CIRCUIT PC BOARD(NADIS-6634-4B/AC)
C951A 27301216 SB1925A <PT>
CIRCUIT NO. PART NO. DESCRIPTIONICs
Q707 222745955 74HC595P
U701 241307 GP1U271X
FUSE PC BOARD (NAETC-6640-4C)
Transistors
CIRCUIT NO. PART NO. DESCRIPTION
Q409,Q410 2211945 2SK246-GR
Fuse holders
Q413,Q414 2211945 2SK246-GR
F903,F904 25050065 YSH403T <PT>
Q709,Q710 2213160 or DTC124ES or
Q708 2213290 or DTC114ES or
Q711,Q712 2213510 or DTA114ES or2215770 KRA102M
2215810 KRC103M
2215960 KRC102M
DiodesD409,D410 223163 or 1SS133 or
D709,D710,D746 223163 or 1SS133 or223205 1SS270A
223205 1SS270AD711 225338 SLR-332VRD720 225339 SPR-39MVWFD712-D717,D721 225340 SLR-332DUD723 225374 SEL2E10C
U4
U5
U7
U8
U10
U9
ACOUSTIC CIRCUIT PC BOARD (NAAF-6632-4B/C)
ICsQ401 22240191 NJM4565D-DQ402,Q403 22240250 NJM2068L-DQ404 222956 NJM2068D-D
TransistorsQ407,Q408 2211945 2SK246-GRQ411,Q412 2211945 2SK246-GRQ415,Q418 2213631 or RN1241-A or
2213632 RN1241-BDiodes
D401-D408 223163 or 1SS133 or223205 1SS270A
U3
CapacitorsC746 353721019 100uF0, 6.3V, Elect.C714,C715 353741009 10uF, 16V, Elect.C717,C718 353741009 10uF, 16V, Elect.C423,C424 374721534 0.015uF±5%, 50V, Plastic
R437 5104341 N14RHC100KWT20Z, BassR438 5104341 N14RHC100KWT20Z, TrebleR461 5104407 N12RGLC250KWT20, Balance
Rotary switchS401 25030415 NRSF-122-15SRB, Source direct
Push switchS701,S702 25035699 NPS-111-S662
JacksP583 25045396 LGT1516-0101, Headphone jack
Socket ASP461A 2009990296 NSAS-6P0429
NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V
NOTE: THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED.
Remote sensor
LED Holder
Resistors
A-905TX
MICROPROCESSOR TERMINAL DESCRIPTIONQ701:HD404316-E30H
Pin No. Function I/O Descriptions
1 TEST I Test pin.
2 RESET I System reset input pin.
3 OSC1 I Pins to connect the ceramic oscillator 4.0MHz.
4 OSC2 O
5 GND I Ground pin.
6 AVSS I Analog reference ground for A/D converter.
7 SEL IN-1 I Rotary switch connection input pin for input selector.
8 SEL IN-2 I
9 KEY IN I Operation key connection pin.
10 905/909 I Initializing input pin for model selector.
11 RI OUT O System code output pin.
12 RI IN I System code input pin.
13 HP IN I Head phone switch position detector pin.
14 DIRECT I Direct switch position detector pin.
15 AVCC I Analog reference voltage for A/D converter.
16 VCC I Power supply pin (+5V).
17 POFF I Power failure detector pin.
18 REM IN I Remote control signal input pin.
19 NC O Speaker relay control signal output pin.
20 MUT LED O MUTING indicator control pin. Light on and off when the muting circuit turns on.
21 NC I No connection.
22 NC
23 VOL UP O Volume control output pin.
24 VOL DOWN O Volume control output pin.
25 POWER 2 Power amplifier control output pin.
26 INPMUT O Muting control output pin.
27 NC Connect to the ground.
28 NC Connect to the ground.
29 NC
30 NC
31 SBASS-1 O Acoustic Presence control output pin.
32 SBASS-2 O
33 SBASS-3 O
34 NC Connect to the ground.
35 NC Connect to the ground.
36 PROTECT I Speaker protect signal detector pin.
37 SBASS LEDA O Acoustic Presence indicator output pin.
38 SBASS LEDB O Acoustic Presence indicator output pin.
39 NC Connect to the ground.
40 CLK O Clock output pin of source selector and indicator ICs.
41 LAT O Latch output pin of source indicator IC.
42 DATA O Data output pin of source selector and indicator ICs.
43 CE O Chip enable output pin of source selector IC.
44 NC No connection.
A-905TX
MICROPROCESSOR CONNECTION DIAGRAMQ701:HD404316E04H
1234567891011
3435363738394041424344
3332313029282726252423
2221201918171615141312
SBASS-3
SBASS-2
SBASS-1
NC
NC
NC
NC
INP MUT
POWER2
VOL DOWN
VOL UP
TEST
RESET
OSC1
OSC2
GND
AVSS
SEL IN-1
SEL IN-2
KEY IN
905/909
RI OUT
NC
NC
PRO
TE
CT
SBA
SSLE
DA
SBA
SSLE
DB
NC
CL
K
LA
T
DA
TACE
NC
NC
NC
MU
T L
ED
RE
LA
Y
RE
M IN
POFF
VC
C
AV
CC
DIR
EC
T
HP IN
RI IN
Q708
Q912
+5V
+5.6V
S401PHONES
P583
P306
RIQ704
+5VACOUSTIC PRESENCES702
INPUTSELECTOR
R732
Q703
Q301TC9273N-010
Q70774HC595
GREENRED
Q702 TA7291S
Q505,Q506
MICROPROCESSORQ701HD404316-E30H
POWERS701
U701
D723
Q415-Q418
R459
SPEAKERRELAYSWITCH
POWER FAILURE DETECTOR
SOURCE DIRECT SWITCH
PROTECTER DETECTOR CIRCUIT
ACOUSTICPRESENCEINDICATOR
ACOUSTICPRESENCE CIRCUIT
VOLUMEINDICATOR
SOURCE INDICATORDRIVER
INPUT SELECTOR
SYSTEM RESET
BUFFER
MOTOR VOLUMEDRIVER IC
POWER AMPLIFIER CIRCUIT
POWER AMPLIFIRECONTROL
INPUT MUTING
VOLUME
REMOTE SENSOR
R569R570
R568R567
R561 R562L502
L502
C51
7
R56
5
R56
4
D911
C914
C914
R56
3
P502AC91
9
R708
D91
8
C92
0
C92
0
C917
C916
D70
7
R91
4
R915D913D912
L501
L501
C915
C915
P90
2B
BBBC C C CEEE
P504
IID
R912
R913
J547
J541J545
J539
J537
R560R558
R556J536
J543
R57
6
Q522
Q530
Q520
Q518Q516
R546
R550 R548
R544
R574
R57
2
R57
5
C515
R555 R559
Q519
Q52
1
Q51
5
Q529
Q517
R55
3
R55
1
R54
5
R54
3
R57
1
R57
3
J542
R54
9
R55
4C518R566J540
C51
6
R55
2
J529
J544J546
J528
P503
J548
JL58
2B
R59
5J5
14
J515
J519J518
J517R594
R596
R593
P501A
J524
J538
J901
P586A
P58
5A
J520
J516 J522
J521J523
R547
J535
R557
L505L503L506
J554
L504
J530
J04AJ03A
C53
1
Q53
2R
603
R60
1
R60
5
R60
7
R60
8
C53
2
R602
Q53
1
R604
J03B
J04B
R60
6
R610C533
Q533
R73
9
R740
J549
J527
J902
+B-B
Q523Q527 E B
Q525 Q526Q528 Q524
J550
+Vcc
-Vcc
ID
IDUP
UP
J531
J532 J5
33 J534
P591BP592B
P591AP592A
C912
C913
J05B
P911BP912B/P914B /P913B
Trimming resistorR576
Test pointP504
Trimming resistorR575
Test pointP503
Rch
Lch
Main circuit PC boardNADG-6630
1. Before Idling adjustment, turn the trimming resistors R575, R576 to counter clockwise.
2. Connect the DC voltmeter to terminal P503, P504.
3. After turn POWER to ON, adjust the trimming resistors R575, R576 so that the reading
of voltmeter becomes 2.0 mV.
4. After adjustment, attach the top cover.
5. Confirm the voltage of above points after five minutes.
6. When less than 2.5 mV : Readjust the trimming resistors above so that the voltage becomes 3.0 mV.
When 2.6 mV to 4.0 mV : It is not necessary to adjust.
When more than 4.1 mV : Readjust the trimming resistors above so that the voltage becomes 3.5 mV.
Note:No load and No signal
Input
50HzSquare wave
GND
3.3k
10k
1SS133 3.3k
0.01 F
Output
GND
Unit
Speakerterminal
Load
Oscillo-scope
AttenuatorDifferentiator
AF OscillatorCDTerminal
0.1 F 35Vp-p
Differentiator
Confirmation of Current detection circuit
1.Connect Differentiator below and apply the 50Hz square signal to the CD terminal.
2.Adjust the attenuator or Volume so that the output level becomes 35V p-p.
3.Confirm that the speaker relay turns OFF when a 0.5 ohm load is connected.
ADJUSTMENT PROCEDUERSIDLING CURRENT ADJUSTMENT
CONFIRMATION OF PROTECTION CIRCUITCONFIRMATION
A-905TX
A-905TX
OOOOOOO############
1
2
2
2
2
54
5
3
5
4
2
2
1
2
4
3
PAD ASSEMBLY PROCEDURES-1ASSEMBLING OF PAD A
: Line shows folding direction
: Line shows folding direction
Procedures : 1 to 5
Pin mark side
Other side
Pin mark
A-905TX
OOOOOOO############
1
1
2
4
3
1
2
2
3
3
4
4
4
3
34
5
5
6
6
6
6
: Line shows folding directionProcedures : 1 to 5
PAD ASSEMBLY PROCEDURES-2ASSEMBLING OF PAD B
Other side
Pin mark side Pin mark
A-905TX
OOOOOOO############
1
2
3
Pad A
Pad B
PAD ASSEMBLY PROCEDURES-3INSERT PAD A TO PAD B
A-905TX
PACKING VIEWPART-XX
PARTS LIST
6
81
4
57
3
2
14
10 13
11
NOTE:<DT> : Asian model only for 120V<PT> : Asian model only for 230V
REF NO. PART NO. DESCRIPTION1 29091886 Pad A2 29091887 Pad B3 29095835 Protection sheet 0.515*650*5504 29110149 Tape5 282301 Staple6 29110141 Tape7 29053720 Carton box8 29362820 Label EAN10 24140456 RC-456S, Remote controller11 3010054 Battery, UM-313 29343066 Instruction manual E
29343065 Instruction manual CT14 29100180 Accessory bag
Bottom side
Bottom side
A-905TX
http://www.onkyo.co.jp/HOMEPAGE
ONKYO U.S.A. CORPORATION18 Park Way, Upper Saddle River, N.J. 07458, U.S.A.Tel: 201-785-2600 Fax: 201-785-2650 E-mail: [email protected]
ONKYO EUROPE ELECTRONICS GmbHIndustriestrasse 20, 82110 Germering, GERMANYTel: 089-849-320 Fax: 089-849-3265 E-mail: [email protected]
ONKYO CHINA LIMITEDUnits 2102-2107, Metroplaza Tower I, 223 Hing Fong Road, Kwai Chung,N.T., HONG KONG Tel: 852-2429-3118 Fax: 852-2428-9039
Sales & Product Planning Div. : 2-1, Nisshin-cho, Neyagawa-shi, OSAKA 572-8540, JAPANTel: 072-831-8111 Fax: 072-833-5222
ONKYO CORPORATION
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