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A-905TX
Ref. No. 3677
SERVICE MANUAL
052001
INTEGRATED STEREO AMPLIFIER
A-905TX
STANDBY/ ON GRAPHIC EQ
CLOCK SLEEP EFFECT MODE
PRESET TUNER INPUT
FM AM
TAPE
PAUSE / STEP DVD
REPEAT SCROLL MD
PLAY MODE CLEAR REC
REPEAT RANDOM CD
MEMORY CLEAR
DISC
REPEAT PLAY MODE CDR
TONE CLEAR REC
INTEGRATED STEREO AMPLIFIER MUTING
VOLUME WIDE RANGE AMP TECHNOLOGY
TIMER 1 2 3
INPUT
4 5 6
UP/DOWN
CD MD TUNER TAPE
STANDBY/ON
7 8 9 VOLUME
ACOUSTIC
PRESENCE
LINE/ DVD CDR/PC
ENTER --/- - - 10 / 0
STANDBY
DIRECT
REMOTE CONTROLLER RC-456S
SOURCE DIRECT
BASS TREBLE BALANCE DIRECT ACOUSTIC
POWER PHONES TONE PRESENCE
ON OFF OFF/1/ 2
-- + -- + L R
A-905TX
UDT 120V AC, 60Hz
UPT 230-240V 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.
A-905TX
SPECIFICATIONS
PART-XX
SERVICE PROCEDURES
PART-XX the fuses
Replacing
This symbol located near the fuse indicates that the REF.NO. PART NO. DESCRIPTION
fuse used is show operating type, For continued protection against F901 252158 1.6A-UL/T-237, Fuse
fire hazard, replace with same type fuse , For fuse rating, refer to 252069 0.8A-SE-EAK, Fuse
the marking adjest to the symbol. F902-F904 252075 2.5A-SE-EAK, Fuse
Ce symbole indique que le fusible utilise est e lent. NOTE:
Pour une protection permanente, n'utiliser que des fusibles de meme : Asian model only for 120V
type. Ce demier est indique la qu le present symbol est apposre. : Asian model only for 230V
A-905TX
CHASSIS EXPLODED VIEW A49 A47
############ A46
P901 U3
P402 A49
A49
U2
P584A P402
A40
U8
A81 U7
A11 A10
A11 U1 U5
P701
P801 A49
A10 A10
A11 Q527 A1
A27
A34 Q525 A56
Q523
A13
A25 A27 A51
A41 A54
A53 A55
Q524 U9
A28
A43 A26 A10 A10
A58 A61
A10 Q526 Q528 A67
A43
F901 A34 A10
F904 F903 A50
F902 A52 A63
A16
U10 A65
T901 A64
A66 A11
U4 A11
E860
A73
A73
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, Holder
A10 838130088 3TTB+8B, Self tapping screw P584A 880009 Plastic rivet, NRP-345
A11 838430088 3TTB+8B(BC), Self tapping screw P701 27191106 UAMS-05S-2, Holder
A13 28198862 Facet, VOL P801 25055436 or NPLG-2P418, Shorted plug
A16 27100375D Chassis 25055945
A25 27160451B Heat sink P901 253277MIL AS-UC-2#18, Power supply cord
27160452B Heat sink 253193HIT AS-CEE, Power supply cord
A26 29110083 Adhesive tape, CROSS-16U Q523,Q524 2202303 or * 2SC4512-O or
A27 801525 3TTB+8B(BC), Special screw 2202304 or * 2SC4512-Y or
838430088 3TTB+8B(BC), Self tapping screw 2202305 * 2SC4512-P, Transistor
A28 801433 3SMS8W.SW+14B(BC), special screw Q525,Q526 2202313 or * 2SA1726-O or
A34 27141530A Retainer, HS-2 2202314 or * 2SA1726-Y or
A40 27300750 Bussing cord 2202315 * 2SA1726-P, Transistor
A41 27122831 Rear panel Q527,Q528 2212654 or * 2SC3421-Y or
27122832 Rear panel 2212653 * 2SC3421-O, Transistor
A43 830440089 4TTC+8C(BC), Self tapping screw T901 2301423 NPT-1374D, Power transformer
A46 28184759-1 Top cover 2301424 NPT-1374P, Power transformer
A47 29362571 Label, WARNING U1 1A905530-4B NADG-6630-4B, Main circuit PC board ass'y
A49 838930088 3TTB+8B(UN), Self tapping screw 1A905530-4C NADG-6630-4C, Main circuit PC board ass'y
A50 838430107 3TTB+10S(BC), Self tapping screw U2 1A905531-4B NAAF-6631-4B, Preamplifier circuit PC board ass'y
A51 27212298 Front panel 1A905531-4C NAAF-6631-4C, Preamplifier circuit PC board ass'y
A52 28198894 Facet 7P U3 1A905532-4B NAAF-6632-4B, Acoustic circuit PC board ass'y
A53 28198895 Facet 1P 1A905532-4C NAAF-6632-4C, Acoustic circuit PC board ass'y
A54 28198925 Facet A U4 1A905533-4B NAPS-6633-4B, Power supply circuit PC board ass'y
A55 27268037 Guide A 1A905533-4C NAPS-6633-4C, Power supply circuit PC board ass'y
A56 28325133 Knob, FM U5 1A905534-4B NADIS-6634-4B, Display circuit PC board ass'y
A58 28191798 Clear plate, RE 1A905534-4C NADIS-6634-4C, Display circuit PC board ass'y
A61 28325926 Knob, INPUT U7 1A905536-4B NAETC-6636-4B, Speaker terminal PC board ass'y
A63 28135247Y Badge 1A905536-4C NAETC-6636-4C, Speaker terminal PC board ass'y
A64 28325925 Knob, VOL U8 1A905537-4B NAETC-6637-4B, Terminal PC board ass'y
A65 28325674 Knob, TD 1A905537-4C NAETC-6637-4C, Terminal PC board ass'y
A66 28325927 Knob, TONE U9 1A905539-4B NAETC-6639-4B, Power switch PC board ass'y
A67 28325673 Knob, POWER 1A905539-4C NAETC-6639-4C, Power switch PC board ass'y
A73 27175323 Leg AS U10 1A905540-4C NAETC-6640-4C, Fuse PC board ass'y
A81 29362630 Label, PROCESSOR
F901 252158 1.6A-UL/T-237, Fuse
252069 0.8A-SE-EAK FSBFUSE, Fuse
F902-F904 252075 2.5A-SE-EAK FUSE
NOTE:
: Asian model only for 120V
NOTE: THE COMPONENTS IDENTIFIED BY MARK : Asian model only for 230V
ARE CRITICAL FOR RISK OF FIRE AND CAUTON :
ELECTRIC SHOCK. REPLACE ONLY WITH Replacement of the transistor of mark * ,if necessary,
PART NUMBER SPECIFIED. must be made from the same beta group(HFE) as the
original type.
A-905TX
A B C D E F G
SCHEMATIC DIAGRAM-1
TO NAAF-6631
P405B P405C
POWER2
R
R
E
E
L
L
NADG-6630 Acoustic Presence AMP&VR
R551
2.2 SUBWOOFER PREOUT
R543 (1/2W)
100 24.6 P582
24.1 (1/2W) Q523
P307 Q519
1 R351 R353 Q301 1.2 2SA965 2SC4512 Q531
R581
LEFT TC9273N-010 L503 2SC1845
2.2K 1M Q527 R547 R603 680
R571 2SC3421 Q515 680
REC 1 VEE VDD 28 15 R601
R352 R354 220 2SC1845 R582
(1/2W) SPEAKERS
TO NAAF-6632 TO NAAF-6631 R567 1K 10K
SPEAKER TERMINAL PC BOARD
U7
RIGHT 2.2K 1M TO NAAF-6632 R557 R607 C581 471
2 CDR-P 27 P401A P403A P501A TO NAAF-6631 P502A 1.8K 10 (1/2W)
JL581C
C531
JL581A
CDR/PC 10K R583
P301 C515 R555 223Z
R569 R561
R301 R303 *C301 10K
C309
10/16 82
MUTING
101
3 CD 26
+B1
S.BASS3
S.BASS2
S.BASS1
POWER2
-B1
+B1
LEFT 1.2K 0.22*2 L501
NF-L
-B1
NF-R
Q529 RL901
+B2
L
-B2
330 (1/2W)
E
R
R
E
E
E
1M 101K
L
L
2SC1740S
R
(2W)
E
L
PLAY 4 TU 25
R302 R304 R563
RIGHT R575 4.7 RL901 R
330 1M *C302 5 L/DVD 24 500B R559 (1/2W)
Q517 10 (1/2W)
101K R595 R573 2SA992 R549
C517
P585A
10 220
P585B
R305 R307 *C303 L505 R605 P584
6 MD-R 23 (1/2W) 15 473
LEFT (1/2W) 820
330 1M 101K R593 -1.2 Q521
Q525 2SA1726 R565 C582
CD 7 MD-P 22 10 -24.1 2SC2235
R308 8.2 C923 471
R306 (1/2W) R545 -24.6 (1/2W) 223Z
RIGHT 100
P586A
P586B
1M *C304 R553
330 8 T-R 21 (1/2W) 2.2 (1/2W)
101K -B1
POWER SWITCH PC BOARD
REC
P302
LEFT
R309
2.2K
R311
1M
9
10
T-P 20
19
R594 10 (1/2W)
R552
+B1
D919
NAETC-6636 U9
R312 2.2
R310 R544 (1/2W)
RIGHT
2.2K 1M